Tübitak SAGE ASELSAN ROKETSAN article's archive

[Bogeyman]

@Cabatli_53 @Anmdt @Combat-Master @Kartal1 @OPTIMUS @T-123456 @MisterLike @Nilgiri @nakaFH @CAN_TR @Oryx @Zafer @Yasar
Don't miss it, guys

 

[Bogeyman]

https://twitter.com/i/web/status/1443022815708471299

Design and fabrication of a vigorous “cavitation-on-a-chip” device with a multiple microchannel configuration

Design and fabrication of a vigorous “cavitation-on-a-chip†device with a multiple microchannel configuration - Microsystems & Nanoengineering

Hydrodynamic cavitation is one of the major phase change phenomena and occurs with a sudden decrease in the local static pressure within a fluid. With the emergence of microelectromechanical systems (MEMS), high-speed microfluidic devices have attracted considerable attention and been...

www.nature.com

Liquid cooling systems in microelectronics (A very critical issue, especially for AESA radars)
Here I shared techniques on ecosystem design and implementation. However, our professional friends who were curious about the effect it had on the radars, I recommend contacting Mr. Ali.

Ali Kosar

 

[Bogeyman]

https://twitter.com/i/web/status/1443022815708471299

Design and fabrication of a vigorous “cavitation-on-a-chip” device with a multiple microchannel configuration

Design and fabrication of a vigorous “cavitation-on-a-chip†device with a multiple microchannel configuration - Microsystems & Nanoengineering

Hydrodynamic cavitation is one of the major phase change phenomena and occurs with a sudden decrease in the local static pressure within a fluid. With the emergence of microelectromechanical systems (MEMS), high-speed microfluidic devices have attracted considerable attention and been...

www.nature.com

Liquid cooling systems in microelectronics (A very critical issue, especially for AESA radars)
Here I shared techniques on ecosystem design and implementation. However, our professional friends who were curious about the effect it had on the radars, I recommend contacting Mr. Ali.

Ali Kosar

@Cabatli_53 @Anmdt @Combat-Master @Kartal1 @OPTIMUS @T-123456 @MisterLike @Nilgiri @nakaFH @CAN_TR @Oryx @Zafer @Yasar @Stimpy75 @Stuka @Saithan
Don't miss it, guys

 

[Bogeyman]

Thermal management system with nanofluids for hybrid electric aircraft battery
Prof.Dr. Tahir Hikmet KARAKOÇ Eskişehir Teknik Üniversitesi-Dr. ÖZGE YETİK Eskişehir Osmangazi Üniversitesi

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Computational modeling of a lithium-ion battery thermal management system with Al2O3-based nanofluids

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Estimation of thermal effect of different busbars materials on prismatic Li-ion batteries based on artificial neural networks

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Three-Dimensional Thermal Study on Lithium-Ion Batteries in a Hybrid Aircraft: Numerical and Experimental Investigations​

01-13-02-0016: Three-Dimensional Thermal Study on Lithium-Ion Batteries in a Hybrid Aircraft: Numerical and Experimental Investigations - Journal Article

<div>The range of an aircraft is determined by the amount of energy that its batteries can store. Today, larger batteries are used to increase the range of electric vehicles, although energy efficiency decreases as the weight of the vehicles increases. Among the elements, lithium (Li) is the...

saemobilus.sae.org

An Investigation on the Electrical Energy Capacity of Cylindrical Lithium-Ion and Lithium Iron Phosphate Battery Cells for Hybrid Aircraft​

01-13-02-0010: An Investigation on the Electrical Energy Capacity of Cylindrical Lithium-Ion and Lithium Iron Phosphate Battery Cells for Hybrid Aircraft - Journal Article

<div>Improving the energy performance of batteries can increase the reliability of electric aircraft. To achieve this goal, battery management systems (BMS) are required to keep the temperature within the battery pack and cells below the safety limits and make the temperature distribution as...

saemobilus.sae.org

Hikmet Karakoç academic publication archive

Hikmet Karakoc

Eskişehir Technical University - Cited by 3,981 - Energy - Aviation - Sustainability

scholar.google.com

Dr. ÖZGE YETİK academic publication archive​

Arş.Gör.Dr. ÖZGE YETİK | AVESİS

avesis.ogu.edu.tr

 

[Bogeyman]

Thermodynamic comparison of TF33 turbofan engine fueled by hydrogen in benchmark with kerosene​

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Özgür Ballı from the 1st Air Maintenance Factory Directorate of the Ministry of National Defense is among the authors of the article.

 

[Bogeyman]

TF33 TURBOFAN ENGINE IN EVERY RESPECT: PERFORMANCE, ENVIRONMENTAL AND SUSTAINABILITY ASSESSMENT

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Determination of design limits of turboprop engines in UAVs.

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Turbine wheel fracture analysis of Jet Fuel Starter (JFS) engine used on F16 military aircraft

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Another Özgür Ballı article series

@Cabatli_53 @T-123456 @Saithan @Zafer @Combat-Master @Nein2.0(Nomad) @OPTIMUS @Kartal1 @Yasar @Stimpy75 @Stuka @Test7 @MisterLike @Nilgiri @mulj

Dont miss it guys

 

[mulj]

TF33 TURBOFAN ENGINE IN EVERY RESPECT: PERFORMANCE, ENVIRONMENTAL AND SUSTAINABILITY ASSESSMENT

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Determination of design limits of turboprop engines in UAVs.

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Turbine wheel fracture analysis of Jet Fuel Starter (JFS) engine used on F16 military aircraft

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Another Özgür Ballı article series

@Cabatli_53 @T-123456 @Saithan @Zafer @Combat-Master @Nein2.0(Nomad) @OPTIMUS @Kartal1 @Yasar @Stimpy75 @Stuka @Test7 @MisterLike @Nilgiri @mulj

Dont miss it guys

this guy is awesome, many insightful information altough i struggle to grasp all technical language, conclusions and view angle by this guy is unique.

 

[Bogeyman]

TUSAŞ/TAI Undergraduate graduation projects.

https://liftup.tusas.com/files/LIFT_UP_2020_2021_bildiri_kitap.pdf

NOTE: Articles have no value for TAI. Published only for inexperienced personnel to gain experience. However, it is a reference document for those who want to have a serious idea about the subject.

Development of Autonomous Defense Algorithm in Air Combat

Using Augmented Reality in Aircraft Modification-Modernization Projects

Optimization of Indigenous Designed Flight Control Card to UAV with Indigenous Software

Comparison of Mechanical Properties of Carbon Reinforced Epoxy Composite Parts Joined with Mechanical Joining, Secondary Bonding, Co-Curing and Co-Bonding Techniques

Optimization of Support Structures in Additive Manufacturing

Morphing Winglet Design and Investigation of the Effect of Using Shape Memory Alloy Material on Aircraft

Composite Fabric Cutting Optimization

Achieving Increased Satellite Part Performance with Topology Optimization and Additive Manufacturing

Item Collection Application with Indoor Mapping Method and Genetic Algorithm

Aircraft Positioning with Multiple Image Merging by Creating Multiple Flight Routes Without GPS

Dynamic Routing System

Preparation of the Minimized Model that Preserves its Dynamics Properties with Additive Manufacturing

Characterization of Distortions During The Production of Aircraft Outer Body Parts by Chemical Milling Method

Optimization of Low Weighted Pressure Bulkhead and Dome in Airplane

GÖKBEY Helicopter Project Assembly Area Facility Layout

Modeling and Optimization of Pilot Decision Making Mechanism

Augmented Reality Solutions in Assembly Processes

A Digital Twin Application in the Aerospace Industry

Locational Accuracy Analysis of Satellite Imagery

Buckling Optimization of Composite Sandwich Panels

Creating and Validating the Finite Element Model for the Use of Inserts in Sandwich Composite Panels

Structural Design and Optimization of Stiffened Composite Plates

Investigation of Fiber Based Composites in National Defense Industry

Conceptual Design Study For 5th Generation Target Drone

Optimum Horizontal Tail Design for a Light Fighter Jet

Usage of Boron Fiber Reinforced Composite Materials in Aircraft Structures

Material Comparison in Thin-Walled Structures (Metal, Composite)

Jet Flow Effects on Control Surfaces

Parallel Multi-Worker Balancing of Assembly Line Operations of T70-Utilities Helicopter

Process Analysis to Improve Geometrical Accuracy of Stamp Forming of Thermoplastic Composites

Aerodynamic and Structural Design of a Drone Propeller

Conceptual Design of an Electric Vertical-Landing Aircraft to be Used in Urban Air Mobility

Autonomous Landing of A Hybrid Aircraft on A Moving Platform based on Inertial Sensing

Supersonic Aerodynamic Analysis and Validations by using PANAIR Panel Method Code

Numerical Computation of Maximum Aerodynamic Loads for an Engine Intake in Supersonic Aircrafts

Standard Time Estimation, Artificial Neural Networks, Regression, 3-4-5 Axis Machines, Decision Support System

Design Improvement of an Aerospace Component Using Hybrid Topology Optimization for Additive Manufacturing

Wireless Communication System Design with MIMO-OFDM Technique

Digital Twin and Augmented Reality Applications in Manufacturing

@Combat-Master @Zafer @Saithan @nakaFH @Yasar @Kartal1 @Cabatli_53 @Nilgiri @yakusha @TheInsider @Fuzuli NL @Test7
@mulj @T-123456

Dont miss it guys

 

[Nilgiri]

TUSAŞ/TAI Undergraduate graduation projects.

https://liftup.tusas.com/files/LIFT_UP_2020_2021_bildiri_kitap.pdf

NOTE: Articles have no value for TAI. Published only for inexperienced personnel to gain experience. However, it is a reference document for those who want to have a serious idea about the subject.

Development of Autonomous Defense Algorithm in Air Combat

Using Augmented Reality in Aircraft Modification-Modernization Projects

Optimization of Indigenous Designed Flight Control Card to UAV with Indigenous Software

Comparison of Mechanical Properties of Carbon Reinforced Epoxy Composite Parts Joined with Mechanical Joining, Secondary Bonding, Co-Curing and Co-Bonding Techniques

Optimization of Support Structures in Additive Manufacturing

Morphing Winglet Design and Investigation of the Effect of Using Shape Memory Alloy Material on Aircraft

Composite Fabric Cutting Optimization

Achieving Increased Satellite Part Performance with Topology Optimization and Additive Manufacturing

Item Collection Application with Indoor Mapping Method and Genetic Algorithm

Aircraft Positioning with Multiple Image Merging by Creating Multiple Flight Routes Without GPS

Dynamic Routing System

Preparation of the Minimized Model that Preserves its Dynamics Properties with Additive Manufacturing

Characterization of Distortions During The Production of Aircraft Outer Body Parts by Chemical Milling Method

Optimization of Low Weighted Pressure Bulkhead and Dome in Airplane

GÖKBEY Helicopter Project Assembly Area Facility Layout

Modeling and Optimization of Pilot Decision Making Mechanism

Augmented Reality Solutions in Assembly Processes

A Digital Twin Application in the Aerospace Industry

Locational Accuracy Analysis of Satellite Imagery

Buckling Optimization of Composite Sandwich Panels

Creating and Validating the Finite Element Model for the Use of Inserts in Sandwich Composite Panels

Structural Design and Optimization of Stiffened Composite Plates

Investigation of Fiber Based Composites in National Defense Industry

Conceptual Design Study For 5th Generation Target Drone

Optimum Horizontal Tail Design for a Light Fighter Jet

Usage of Boron Fiber Reinforced Composite Materials in Aircraft Structures

Material Comparison in Thin-Walled Structures (Metal, Composite)

Jet Flow Effects on Control Surfaces

Parallel Multi-Worker Balancing of Assembly Line Operations of T70-Utilities Helicopter

Process Analysis to Improve Geometrical Accuracy of Stamp Forming of Thermoplastic Composites

Aerodynamic and Structural Design of a Drone Propeller

Conceptual Design of an Electric Vertical-Landing Aircraft to be Used in Urban Air Mobility

Autonomous Landing of A Hybrid Aircraft on A Moving Platform based on Inertial Sensing

Supersonic Aerodynamic Analysis and Validations by using PANAIR Panel Method Code

Numerical Computation of Maximum Aerodynamic Loads for an Engine Intake in Supersonic Aircrafts

Standard Time Estimation, Artificial Neural Networks, Regression, 3-4-5 Axis Machines, Decision Support System

Design Improvement of an Aerospace Component Using Hybrid Topology Optimization for Additive Manufacturing

Wireless Communication System Design with MIMO-OFDM Technique

Digital Twin and Augmented Reality Applications in Manufacturing

@Combat-Master @Zafer @Saithan @nakaFH @Yasar @Kartal1 @Cabatli_53 @Nilgiri @yakusha @TheInsider @Fuzuli NL @Test7
@mulj @T-123456

Dont miss it guys

I cant understand the turkish, but I appreciate the tags as I can definitely follow the universal language of FEA diagrams

@Sinan TAI uses CATIA+abaqus for sure. I see Ansys too.

openfoam for the CFD.

 

[Spook]

I cant understand the turkish, but I appreciate the tags as I can definitely follow the universal language of FEA diagrams

@Sinan TAI uses CATIA+abaqus for sure. I see Ansys too.

openfoam for the CFD.

These software is going to become serious security issue for any country. You are forced to use them as there is no equal alternatives. They are restricting offline use etc with cloud only use as it progresses. Wisest decision would be start multinational open source development to take some of the burden.

 

[Nilgiri]

These software is going to become serious security issue for any country. You are forced to use them as there is no equal alternatives. They are restricting offline use etc with cloud only use as it progresses. Wisest decision would be start multinational open source development to take some of the burden.

Well a country only has so much brainpower to deploy, it must prioritise where it is best used.

Deploy in A means taking away from B etc.

I am a veteran myself in Abaqus...and it is super powerful and efficient....and saves immense amount of time on the core if done efficiently.

When it comes to defence sector, it is my understanding that each (major) country generally has a secure proprietary system regarding this stuff....especially critical projects.

You use specific modules....you can even develop own solver code quite specifically (I have had to do this on occasion myself).

Abaqus etc, its just a very good "one size fits all" broad guy....its selling point is its robustness in lot of areas.

But you can make specific solvers for each area if you want....and keep it all proprietary. Just depends how far you want to take it.

Lot of instances FEA need not even be the best approach for it...there are other emerging methods like BEM....depending on what the geometry of the part is etc.

You basically do critical things in a different way....and limit exposure by doing stuff in relevant "final" chunks on any potentially shared processing + networking.

Or you make do with what you can air-gap fully and throw more brains and time at it.

University projects etc, wouldnt really fall under this anyway.

But I am not sure what the setup is in TAI at large.

 

[Combat-Master]

DEVELOPMENT OF CARBON COMPOSITE/ALUMINUM LINER HYBRID ROCKET MOTOR CASE - Roketsan
In the scope of the lightweight motor case development study, design, analysis, prototype production and verification phases of a 1 mm aluminum-lined, carbon fiber overwrapped rocket motor case presented. The development phase is completed by performing hydrostatic burst tests for six hybrid motor cases. All prototypes were conditioned to three different temperatures such as -35 °C, 23 °C and 70 °C. At the end of the test series, it was shown that all the prototypes satisfy mechanical/structural performance requirements. Hence, the motor with composite case development and verification studies were proved to be successful and in good agreement with the analysis results. The overwrapped motor cases are as much as 30 % more weight efficient than bare aluminum motor case.

Composite materials are highly preferred in pressure bearing structures due to their high strength to density ratio. Pressure-bearing metal pipes with composite winding are more efficient than metal pipes which carry the same pressure. In an isotropic cylindrical pressure vessel, the circumferential tension is twice the axial tension. In this study, the design of solid fuel hybrid rocket motor cases manufactured by carbon-epoxy composite winding over metal liner is discussed for the audience of rocket motor design engineers. The hybrid motor case consists of two main components which are metal part and composite overwrapped part. The metal part has a liner section which acts as a sealant and carries a part of the internal pressure load (Ref. 1). In addition to the liner section, there are two connection interfaces for the attachment of igniter and nozzle parts. The metal part material is selected as Al-7075 T6 and overwrapped composite material is a combination of carbon fiber-epoxy matrix.

 

[Bogeyman]

Design of an X-Band GaN Based Microstrip MMIC Power Amplifier


RF power amplifiers are crucial components of modern radar and communication
systems. However, their design poses some challenges due to device limitations in
high power and high frequency regime, as well as inherent diculties of designing
for nonlinear large-signal device operation. Gallium Nitride (GaN) based High
Electron Mobility Transistors (HEMT) are promising candidates due to their
superior material qualities, high power densities and ability to operate up to
mm-wave frequencies.

In this thesis, 0.25 μm GaN on SiC microfabrication process of Bilkent University
Nanotechnology Research Center (NANOTAM) is presented. Transistor
characterization procedure is demonstrated. Ideal transistor layout for design
goals is selected and the transistor gate structure is optimized for X-band performance.
A model library for microstrip passive circuit elements based on electromagnetic
simulations has been developed. Finally, design and measurements
of an X-band microstrip Class AB two-stage Monolithic Microwave Integrated
Circuit (MMIC) PA, based on the same process are presented in detail.

With die sizes smaller than 4.3 mm by 2.3 mm, fabricated MMICs operate at
8.5 - 11.5 GHz band with 24 dB small-signal gain. More than 13.5 W (41.3 dBm)
output power (P6dB) and 31 - 38 % power-added eciency are achieved throughout
the 8.5 - 11 GHz band in pulsed mode on-wafer measurements.

Ulusal Tez Merkezi | Anasayfa

Yükseköğretim Kurulu Tez Merkezi'nde bulunan basılı bütün tezleri tarayarak, üye olduktan sonra izinli tezlere tam metin(pdf) olarak erişebilirisiniz.

tez.yok.gov.tr

 

[Bogeyman]

ASELSAN leads the world in the cooling of nano-electronic structures.

As part of the macro/micro/nano scale electronic cooling technologies research and development activities carried out within ASELSAN, Assoc. Dr. The results of the scientific study conducted by Yiğit Akkuş in collaboration with Southern Methodist University (SMU) in the USA were published in The Journal of Physical Chemistry Letters with the title Energy-Based Interface Detection for Phase Change Processes of Monatomic Fluids in Nanoconfinements.

Within the scope of the study, evaporation and condensation processes on nano-structures, which are critical in innovative cooling technologies, were examined. The main objective of the study was the detection of the liquid-vapor boundary in the transition zone between the liquid and vapor phases with high precision. The motivation of the study was the lack of a common consensus on the molecular precision of the liquid-vapor boundary line in the current literature. As a result of the study, it was shown that the difficulties posed by the existing methods were overcome when the liquid-vapor boundary was determined by an energy-based method that has not been proposed before. It is thought that this proposed method will guide the studies to be carried out on the subject in the near future.

The scientific journal published by the study (The Journal of Physical Chemistry Letters: impact factor 6.5) is indexed by the Nature Index*. While nine companies were able to publish in Nature Index journals between 2015 and 2021 in non-academic organizations in Turkey, ASELSAN was the only defense industry company to be included in this list. ASELSAN will re-enter this list, where only one company across the country has been able to enter with a single publication in the last three years.

*Nature Index: It is a database established by Nature Publishing Group, the leading scientific publishing organization in the world, following scientific outputs since 2015. Eighty-two scientific journals selected by an independent committee composed of leading scientists in their fields are indexed by Nature Index.

https://aselsan.com.tr/ASELSANabulten41_4884.pdf

Full Article

Energy-Based Interface Detection for Phase Change Processes of Monatomic Fluids in Nanoconfinements

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Doç. Dr. Yiğit Akkuş full academics profile

Yigit Akkus

Associate Professor of Mechanical Engineering, Ericsson AB - Cited by 447 - Thermal Management - Interfacial Transport - Heat Pipes - Molecular Dynamics - Droplet Evaporation

scholar.google.com.tr

@Combat-Master @Zafer @Saithan @nakaFH @Yasar @Kartal1 @Cabatli_53 @Nilgiri @yakusha @TheInsider @Fuzuli NL @Test7 @mulj @T-123456 @Stimpy75 @Stuka

Dont miss it guys

 

[Bogeyman]

Assoc. Dr. Yiğit Akkuş, Hossein Alijani from Bilkent University and Assoc. Dr. Barbaros Çetin, with his article on liquid cooling systems in microelectronics published in 2017, I think they planned to cool Akıncı's AESA radar.
There are specific references to miniaturization and UAVs for aerospace applications.

Effect of Design and Operating Parameters on the Thermal Performance of Aluminum Flat Grooved Heat Pipes

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@Combat-Master @Zafer @Saithan @nakaFH @Yasar @Kartal1 @Cabatli_53 @Nilgiri @yakusha @TheInsider @Fuzuli NL @Test7 @mulj @T-123456 @Stimpy75 @Stuka

Dont miss it guys

 

[Bogeyman]

Nonlinear Model Based Guidance with Deep Learning Based Target Trajectory Prediction Against Aerial Agile Attack Patterns​

In this work, we propose a novel missile guidance algorithm that combines deep learning based trajectory prediction with nonlinear model predictive control. Although missile guidance and threat interception is a well-studied problem, existing algorithms' performance degrades significantly when the target is pulling high acceleration attack maneuvers while rapidly changing its direction. We argue that since most threats execute similar attack maneuvers, these nonlinear trajectory patterns can be processed with modern machine learning methods to build high accuracy trajectory prediction algorithms. We train a long short-term memory network (LSTM) based on a class of simulated structured agile attack patterns, then combine this predictor with quadratic programming based nonlinear model predictive control (NMPC). Our method, named nonlinear model based predictive control with target acceleration predictions (NMPC-TAP), significantly outperforms compared approaches in terms of miss distance, for the scenarios where the target/threat is executing agile maneuvers.

[2104.02491] Nonlinear Model Based Guidance with Deep Learning Based Target Trajectory Prediction Against Aerial Agile Attack Patterns

@Cabatli_53 @Anmdt @Combat-Master @Kartal1 @OPTIMUS @T-123456 @MisterLike @Nilgiri @CAN_TR @Oryx @Zafer @Yasar @Fuzuli NL @Stuka @Stimpy75

TÜBİTAK BİLGEM is working on Missile Guidance Algorithm.

 

[Bogeyman]

ECCM techniques in IR guided air defense missiles
Master of Science in Electrical and Electronics Engineering Department, Middle East Technical University

Surface-to-air missiles having infrared detectors, aiming to destroy air platforms, determine the position of targets based on the infrared energy radiating from air platforms. It is possible to detect infrared signals radiating from anair platformbyamissileseeker. Thiswillenablethe missile to estimate target position with respect to missile seeker. On the other hand, there are many advanced techniques developed to prevent missiles to damage targets. It is a real need for the missiles to overcome these ECM (Electronic-Counter-Measures) techniques which are carried out by air platform. In order to satisfy this basic need of missiles, certain techniques called ECCM (Electronic-Counter-Counter-Measures) techniques have been developed. In this study, surface-to-air missile equipped with imaging infrared seeker, which has dual band Focal-Plane-Array detector, has been designed to detect target position. Infrared detector detects and measures the position of target, if the intensity of the detected infrared signals is above threshold level. In this manner, background noise is eliminated. At the same time, ECCMtechniques prevent seeker to be misled by MTV (Magnesium/Teflon/Viton) and spectral flares which are ECM ammunition dispensed by an air platform. In order to realize and test the models, simulator has been developed. Dynamic motion and 3D infrared signature models of F-16 air platform; detector, ECCM techniques, gimbal, guidance, kinematicmotionmodelsofmissile; MTVandspectralflaresmotionand3Dinfraredsignature models with respect to time have been developed at simulator.

https://acikbilim.yok.gov.tr/bitstream/handle/20.500.12812/243927/yokAcikBilim_10016524.pdf?sequence=-1&isAllowed=y

Optimization of Passive Electronic Countermeasures Techniques Against Infrared Missiles with Genetic Algorithm
DIRCM electronic countermeasure project publication of Atak Helicopter - TÜBİTAK BİLGEM İLTAREN

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ANALYSIS OF JAMMING EFFECTIVENESS ON MISS DISTANCE

In this paper, with a view to neutralize the guided missile, effectiveness of jamming Electronic Attack (EA) technique, which is applied by helicopter platform, on miss distance is analyzed. The missile, which has infrared seeker and 3D PPN guidance model, is modeled as a point-mass. This missile is also equipped with last value and linear extrapolation Electronic Protection (EP) against jamming EA technique carried out by platform. As a result of analysis, the increasing of seeker tracking error and jamming duration increase the miss-distance. In addition, last value EP is more effective than linear extrapolation with regards to missile. (DIRCM electronic countermeasure project publication of Atak Helicopter again)

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An in-depth analysis of hyperspectral target detection with shadow compensation via LiDAR
Tubitak Bilgem İltaren article

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High Dynamic Range Infrared Imaging for Moving Objects
Tubitak Bilgem İltaren article

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@Combat-Master @Zafer @Saithan @nakaFH @Yasar @Kartal1 @Cabatli_53 @Nilgiri @yakusha @TheInsider @Fuzuli NL @Test7 @mulj @T-123456 @Stimpy75 @Stuka



Dont miss it guys

 

[Bogeyman]

@Combat-Master @Zafer @Saithan @nakaFH @Yasar @Kartal1 @Cabatli_53 @Nilgiri @yakusha @TheInsider @Fuzuli NL @Test7 @mulj @T-123456 @Stimpy75 @Stuka



Dont miss it guys

I saved the most explosive news for last.

@Combat-Master @Zafer @Saithan @nakaFH @Yasar @Kartal1 @Cabatli_53 @Nilgiri @yakusha @TheInsider @Fuzuli NL @Test7 @mulj @T-123456 @Stimpy75 @Stuka

Investigation of radiant millimeter wave/terahertz radiation from low-infrared signature targets

Berat Akyuz

Middle East Technical University | METU · Department of Physics​

Abstract

Millimeter (mm) and sub-mm wave radiation is increasingly becoming a region of interest as better methods are developed to detect in this wavelength range. The development of sensitive focal plane array (FPA) architectures as well as single pixel scanners has opened up a new field of passive detection and imaging. Spectral signatures of objects, a long standing area of interest in the Short Wave Infrared (SWIR), Mid-Wave (MWIR) and Long Wave-IR (LWIR) bands can now be assessed in the mm-wave/terahertz (THz) region. The advantage is that this form of radiation is not as adversely affected by poor atmospheric conditions compared to other bands. In this study, a preliminary experiment in a laboratory environment is performed to assess the radiance from targets with low infrared signatures in the millimeter wave/terahertz (THz) band (<1 THz). The goal of this approach is to be able to model the experimental results to better understand the mm-wave/THz signature of targets with low observability in the IR bands. Investigation of radiant millimeter wave/terahertz radiation from low-infrared signature targets SPIE Digital Library Proceedings www.spiedigitallibrary.org

Applications of various sensors for detecting THz waves in adverse conditions

Abstract

Comparison of atmospheric transmission in the bands ranging from terahertz (THz) to infrared (IR) bands using MODTRAN and available literature data show that THz radiation is not dramatically attenuated in adverse conditions when compared to IR bands especially at long distances. Favorable THz bands and mechanisms for detection of low IR signature target under adverse conditions in these bands are determined. In this study, a set of experiments are conducted to compare THz detection mechanisms, which are THz detectors and IR microbolometer cameras. Typically, IR Microbolometer cameras are not sensitive enough to detect THz waves and their sensitivity needs to be improved. While THz microbolometer cameras are being continuously improved the use of a THz to IR converter intermediary component allows a cost-effective solution to the problem. A THz to IR converter based on a metasurface absorber is studied in this regard. The effectiveness of the device is simulated and the temperature difference that can be detected with the IR microbolometer camera is modeled based on heat transfer equations. Applications of various sensors for detecting THz waves in adverse conditions SPIE Digital Library Proceedings www.spiedigitallibrary.org

 

[mulj]

so, stealth no more?

 

[Bogeyman]

I saved the most explosive news for last.

@Combat-Master @Zafer @Saithan @nakaFH @Yasar @Kartal1 @Cabatli_53 @Nilgiri @yakusha @TheInsider @Fuzuli NL @Test7 @mulj @T-123456 @Stimpy75 @Stuka

Investigation of radiant millimeter wave/terahertz radiation from low-infrared signature targets

Berat Akyuz​

​

Middle East Technical University | METU · Department of Physics​

Abstract

Millimeter (mm) and sub-mm wave radiation is increasingly becoming a region of interest as better methods are developed to detect in this wavelength range. The development of sensitive focal plane array (FPA) architectures as well as single pixel scanners has opened up a new field of passive detection and imaging. Spectral signatures of objects, a long standing area of interest in the Short Wave Infrared (SWIR), Mid-Wave (MWIR) and Long Wave-IR (LWIR) bands can now be assessed in the mm-wave/terahertz (THz) region. The advantage is that this form of radiation is not as adversely affected by poor atmospheric conditions compared to other bands. In this study, a preliminary experiment in a laboratory environment is performed to assess the radiance from targets with low infrared signatures in the millimeter wave/terahertz (THz) band (<1 THz). The goal of this approach is to be able to model the experimental results to better understand the mm-wave/THz signature of targets with low observability in the IR bands. Investigation of radiant millimeter wave/terahertz radiation from low-infrared signature targets SPIE Digital Library Proceedings www.spiedigitallibrary.org

Applications of various sensors for detecting THz waves in adverse conditions

Abstract

Comparison of atmospheric transmission in the bands ranging from terahertz (THz) to infrared (IR) bands using MODTRAN and available literature data show that THz radiation is not dramatically attenuated in adverse conditions when compared to IR bands especially at long distances. Favorable THz bands and mechanisms for detection of low IR signature target under adverse conditions in these bands are determined. In this study, a set of experiments are conducted to compare THz detection mechanisms, which are THz detectors and IR microbolometer cameras. Typically, IR Microbolometer cameras are not sensitive enough to detect THz waves and their sensitivity needs to be improved. While THz microbolometer cameras are being continuously improved the use of a THz to IR converter intermediary component allows a cost-effective solution to the problem. A THz to IR converter based on a metasurface absorber is studied in this regard. The effectiveness of the device is simulated and the temperature difference that can be detected with the IR microbolometer camera is modeled based on heat transfer equations. Applications of various sensors for detecting THz waves in adverse conditions SPIE Digital Library Proceedings www.spiedigitallibrary.org

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