Share
VIDEOS 1 TO 50
Thermal Imaging and Its Applications
Thermal Imaging and Its Applications
Published: 2016/03/09
Channel: ElectroBOOM
What Your Life Looks Like In Thermal
What Your Life Looks Like In Thermal
Published: 2014/11/17
Channel: BuzzFeedBlue
See through walls!  Flir One Thermal Imaging Infrared Camera review
See through walls! Flir One Thermal Imaging Infrared Camera review
Published: 2016/01/27
Channel: kennan
Electrical Inspection with a Thermal Imaging Camera
Electrical Inspection with a Thermal Imaging Camera
Published: 2014/09/05
Channel: Keysight General Purpose Instruments
Battle of the thermal imaging cameras: FLIR ONE vs Seek Thermal Compact
Battle of the thermal imaging cameras: FLIR ONE vs Seek Thermal Compact
Published: 2016/02/08
Channel: PhoneArena
FLIR E4, E5, E6, E8 Thermal Imaging Cameras
FLIR E4, E5, E6, E8 Thermal Imaging Cameras
Published: 2013/10/20
Channel: Anaum
See Through & Fun Thermal Camera Experiments
See Through & Fun Thermal Camera Experiments
Published: 2012/10/25
Channel: Will Rose
20 Things - Shot With A Thermal Camera!
20 Things - Shot With A Thermal Camera!
Published: 2016/11/19
Channel: MadeMyDay
FLIR Thermal Imaging for the Criminally Stupid
FLIR Thermal Imaging for the Criminally Stupid
Published: 2012/04/04
Channel: P1BLUtube
PEOPLE FARTING ON THERMAL CAMERA
PEOPLE FARTING ON THERMAL CAMERA
Published: 2016/01/05
Channel: BANANA FACTORY
CAT S60 - A indestructible Smartphone with a Thermal Imaging Camera [4K]
CAT S60 - A indestructible Smartphone with a Thermal Imaging Camera [4K]
Published: 2016/03/15
Channel: TechMagnet
Thermwood LSAM Thermographic Camera
Thermwood LSAM Thermographic Camera
Published: 2016/11/29
Channel: Thermwood Corporation
Stupid Thermal Imaging Tricks
Stupid Thermal Imaging Tricks
Published: 2016/04/05
Channel: Roswell Flight Test Crew
10/20/2013 BRITISH Police helicopters thermal imaging camera detects heat from cannabis factory
10/20/2013 BRITISH Police helicopters thermal imaging camera detects heat from cannabis factory
Published: 2013/10/20
Channel: News
Why Use Infrared Thermography?
Why Use Infrared Thermography?
Published: 2011/10/21
Channel: Pass Thermal
Flir Thermal Imaging Cameras for Security
Flir Thermal Imaging Cameras for Security
Published: 2011/02/11
Channel: cctvbiz
Defeat Thermal Imaging and Surive Modern Warfare
Defeat Thermal Imaging and Surive Modern Warfare
Published: 2014/02/04
Channel: Patriot Suit™
The Proper Operation of the Thermal Imaging Camera
The Proper Operation of the Thermal Imaging Camera
Published: 2014/10/16
Channel: Palm Beach County Fire Rescue
How infrared imaging camera work
How infrared imaging camera work
Published: 2012/03/16
Channel: airconcern
Inexpensive infrared thermal imager HT-02, review, test, settings.
Inexpensive infrared thermal imager HT-02, review, test, settings.
Published: 2017/04/30
Channel: Useful and interesting devices
Poor Man
Poor Man's Thermographic Camera 2
Published: 2011/06/19
Channel: floba
Night Vision versus Thermal Imaging
Night Vision versus Thermal Imaging
Published: 2010/02/09
Channel: 2020Tech
Can A Thermal Imaging Camera See Through Walls?
Can A Thermal Imaging Camera See Through Walls?
Published: 2009/09/10
Channel: GlobalTestSupply
Thermographic Surveys of Buildings using Flir Thermal Imaging camera
Thermographic Surveys of Buildings using Flir Thermal Imaging camera
Published: 2012/08/01
Channel: RedCurrentLTD
Home Inspection in PREDATOR VISION! - FLIR Thermal Imaging Camera
Home Inspection in PREDATOR VISION! - FLIR Thermal Imaging Camera
Published: 2017/09/18
Channel: The Guitologist
Applications of Thermal Imaging Camera
Applications of Thermal Imaging Camera
Published: 2016/09/18
Channel: Synergy Files
DO NOT RECORD WITH THERMAL CAMERAS AT 3PM!
DO NOT RECORD WITH THERMAL CAMERAS AT 3PM!
Published: 2017/12/11
Channel: Guava Juice
Thermal Imaging Camera - Water Leak
Thermal Imaging Camera - Water Leak
Published: 2015/03/11
Channel: bpicaus
FLIR infrared camera for building and home inspection
FLIR infrared camera for building and home inspection
Published: 2007/11/22
Channel: Gunther Willems
FLIR C2: Full-Featured Thermal Imaging Camera For Your Pocket
FLIR C2: Full-Featured Thermal Imaging Camera For Your Pocket
Published: 2015/01/07
Channel: FLIR Systems
📸 Thermal Imaging Infrared Camera for Night Vision : How to Make it
📸 Thermal Imaging Infrared Camera for Night Vision : How to Make it
Published: 2016/05/15
Channel: Kedar Nimbalkar
[Hindi-Audio]-A Short Video on Thermal Imaging Camera: Working, Construction and Usage.
[Hindi-Audio]-A Short Video on Thermal Imaging Camera: Working, Construction and Usage.
Published: 2016/04/05
Channel: BCD Technology
Thermal Imaging Camera Looking Around the House Unboxing of Flir E4
Thermal Imaging Camera Looking Around the House Unboxing of Flir E4
Published: 2015/01/07
Channel: 2LateIWon/Organized Chaos
Create Your Own Thermal Imaging Camera With The FLiR Dev Kit
Create Your Own Thermal Imaging Camera With The FLiR Dev Kit
Published: 2016/08/04
Channel: Cool Components Ltd
Be aware of Airport Thermal Imaging
Be aware of Airport Thermal Imaging
Published: 2007/03/06
Channel: walaboom
Zenmuse XT: Thermal Imaging Camera from FLIR and DJI
Zenmuse XT: Thermal Imaging Camera from FLIR and DJI
Published: 2015/12/11
Channel: Roswell Flight Test Crew
DEWALT DCT416 Thermal Imaging Camera Preview
DEWALT DCT416 Thermal Imaging Camera Preview
Published: 2012/09/26
Channel: FrontStepsMediaLLC
FLIR T1K Thermal Imaging Camera: Rapid Report
FLIR T1K Thermal Imaging Camera: Rapid Report
Published: 2015/09/08
Channel: FLIR Systems
Introducing the FLIR ETS320 Benchtop Thermal Imaging Camera
Introducing the FLIR ETS320 Benchtop Thermal Imaging Camera
Published: 2017/04/24
Channel: FLIR Systems
DIY thermal imaging
DIY thermal imaging
Published: 2017/01/15
Channel: Niklas Roy
FlIR   Thermal Imaging Camera for iPhone Hands on, Features and Usage Demo
FlIR Thermal Imaging Camera for iPhone Hands on, Features and Usage Demo
Published: 2014/03/03
Channel: GadgetsToUse
Zenmuse XT - The World Leader in thermal imaging Camera Drones from FLIR and DJI By Three P
Zenmuse XT - The World Leader in thermal imaging Camera Drones from FLIR and DJI By Three P's
Published: 2015/12/12
Channel: ReVu tv
Thermal Imaging Camera to repair refrigeration Fridge Freezers Cat s60 & Samung Iphone Etc
Thermal Imaging Camera to repair refrigeration Fridge Freezers Cat s60 & Samung Iphone Etc
Published: 2016/10/07
Channel: how-2-repair.com
Water Damage Detection with FLIR Thermal Imaging Camera
Water Damage Detection with FLIR Thermal Imaging Camera
Published: 2013/02/22
Channel: pauldaviscleveland
Adam Savage has fun with a FLIR Thermal Imaging Camera!
Adam Savage has fun with a FLIR Thermal Imaging Camera!
Published: 2016/11/15
Channel: FLIR Systems
DJI Mavic FLIR Camera! THERMAL IMAGING SOLUTION KIT!
DJI Mavic FLIR Camera! THERMAL IMAGING SOLUTION KIT!
Published: 2017/10/08
Channel: Drone Nerds
Top 8 Best Thermal Imagers Reviews 2016, Thermal Imaging Camera Reviews
Top 8 Best Thermal Imagers Reviews 2016, Thermal Imaging Camera Reviews
Published: 2016/11/19
Channel: Michael Robinson
Audi night vision thermal imaging camera teardown
Audi night vision thermal imaging camera teardown
Published: 2013/11/10
Channel: mikeselectricstuff
FLIR E6 Thermal Imaging Camera Review - Flir E-Series Cameras Video Review
FLIR E6 Thermal Imaging Camera Review - Flir E-Series Cameras Video Review
Published: 2014/08/21
Channel: Hot Product Price Comparison Video Reviews
Hands On with The FLIR ONE Pro Thermal Imaging Camera
Hands On with The FLIR ONE Pro Thermal Imaging Camera
Published: 2017/08/22
Channel: DIYTECK
NEXT
GO TO RESULTS [51 .. 100]

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
  (Redirected from IR sensor)
Jump to: navigation, search
Image of a Chihuahua taken in mid-infrared ("thermal") light (false-color)

A thermographic camera (also called an infrared camera or thermal imaging camera) is a device that forms an image using infrared radiation, similar to a common camera that forms an image using visible light. Instead of the 400–700 nanometre range of the visible light camera, infrared cameras operate in wavelengths as long as 14,000 nm (14 µm). Their use is called thermography.

History[edit]

Discovery and research of infrared radiation[edit]

Infrared was discovered in 1800 by Sir William Herschel as a form of radiation beyond red light. These "infrared rays" (infra is the Latin prefix for "below") were used mainly for thermal measurement.[1] There are four basic laws of IR radiation: Kirchhoff's law of thermal radiation, Stefan-Boltzmann law, Planck’s law, and Wien’s displacement law. The development of detectors was mainly focused on the use of thermometer and bolometers until World War I. Leopoldo Nobili fabricated the first thermocouple in 1829, which paved the way for Macedonio Melloni to show that a person 10 meters away could be detected with his multielement thermopile. The bolometer was invented in 1878 by Langley. It had the capability to detect radiation from a cow from 400 meters away, and was sensitive to differences in temperature of one hundred thousandth of a degree Celsius.[2]

The first advanced application of IR technology in the civil section may have been a device to detect the presence of icebergs and steamships using a mirror and thermopile, patented in 1913.[3] This was soon outdone by the first true IR iceberg detector, which did not use thermopiles, patented in 1914 by R.D. Parker.[4] This was followed up by G.A. Barker’s proposal to use the IR system to detect forest fires in 1934.[5] The technique was not truly industrialized until it was used in the analysis of heating uniformity in hot steel strips in 1935.[6]

First thermographic camera[edit]

In 1929, Hungarian physicist Kálmán Tihanyi invented the infrared-sensitive (night vision) electronic television camera for anti-aircraft defense in Britain.[7] The first thermographic cameras developed were infrared line scanners. This was created by the US military and Texas Instruments in 1947[8][not in citation given] and took one hour to produce a single image. While several approaches were investigated to improve the speed and accuracy of the technology, one of the most crucial factors dealt with scanning an image, which the AGA company was able to commercialize using a cooled photoconductor.[9]

The first infrared linescan system was the British Yellow Duckling of the mid 1950s.[10] This used a continuously rotating mirror and detector, with Y axis scanning by the motion of the carrier aircraft. Although unsuccessful in its intended application of submarine tracking by wake detection, it was applied to land-based surveillance and became the foundation of military IR linescan.

This work was further developed at the Royal Signals and Radar Establishment in the UK when they discovered mercury cadmium telluride could be used as a conductor that required much less cooling. Honeywell in the United States also developed arrays of detectors which could cool at a lower temperature, but they scanned mechanically. This method had several disadvantages which could be overcome using an electronically scanning system. In 1969 Michael Francis Tompsett at English Electric Valve Company in the UK patented a camera which scanned pyro-electronically and which reached a high level of performance after several other breakthroughs throughout the 1970s.[11] Tompsett also proposed an idea for solid-state thermal-imaging arrays, which eventually led to modern hybridized single-crystal-slice imaging devices.[9]

Smart sensors[edit]

One of the most important areas of development for security systems was for the ability to intelligently evaluate a signal, as well as warning for a threat's presence. Under the encouragement of the United States Strategic Defense Initiative, "smart sensors" began to appear. These are sensors that could integrate sensing, signal extraction, processing, and comprehension.[12] There are two main types of Smart Sensors. One, similar to what are called "vision chips" when used in the visible range, allow for preprocessing using Smart Sensing techniques due to the increase in growth of integrated microcircuitry.[13] The other technology is more oriented to a specific use and fulfills its preprocessing goal through its design and structure.[14]

Towards the end of the 1990s the use of infrared was moving towards civil use. There was a dramatic lowering of costs for uncooled arrays, which along with the large increase in developments lead to a dual way use market between civil and military.[15] These uses include environmental control, building/art analysis, medical functional diagnostics, and car guidance and collision avoidance systems.[16][17][18][19][20][21][22]

Theory of operation[edit]

A thermal image showing temperature variation in a hot air balloon.

Infrared energy is just one part of the electromagnetic spectrum, which encompasses radiation from gamma rays, x-rays, ultra violet, a thin region of visible light, infrared, terahertz waves, microwaves, and radio waves. These are all related and differentiated in the length of their wave (wavelength). All objects emit a certain amount of black body radiation as a function of their temperatures.

Generally speaking, the higher an object's temperature, the more infrared radiation is emitted as black-body radiation. A special camera can detect this radiation in a way similar to the way an ordinary camera detects visible light. It works even in total darkness because ambient light level does not matter. This makes it useful for rescue operations in smoke-filled buildings and underground.

A major difference with optical cameras is that the focusing lenses cannot be made of glass, as glass blocks long-wave infrared light. Special materials such as Germanium or Sapphire crystals must be used. Germanium lenses are also quite fragile, so often have a hard coating to protect against accidental contact. The higher cost of these special lenses is one reason why thermographic cameras are more costly.

In use[edit]

Thermographic image of a ringtailed lemur

Images from infrared cameras tend to be monochrome because the cameras generally use an image sensor that does not distinguish different wavelengths of infrared radiation. Color image sensors require a complex construction to differentiate wavelengths, and color has less meaning outside of the normal visible spectrum because the differing wavelengths do not map uniformly into the system of color vision used by humans.

Sometimes these monochromatic images are displayed in pseudo-color, where changes in color are used rather than changes in intensity to display changes in the signal. This technique, called density slicing, is useful because although humans have much greater dynamic range in intensity detection than color overall, the ability to see fine intensity differences in bright areas is fairly limited.

For use in temperature measurement the brightest (warmest) parts of the image are customarily colored white, intermediate temperatures reds and yellows, and the dimmest (coolest) parts black. A scale should be shown next to a false color image to relate colors to temperatures. Their resolution is considerably lower than that of optical cameras, mostly only 160 x 120 or 320 x 240 pixels, although more expensive cameras can achieve a resolution of 1280 x 1024 pixels. Thermographic cameras are much more expensive than their visible-spectrum counterparts, though low-performance add-on thermal cameras for smartphones became available for hundreds of dollars in 2014.[23] Higher-end models are often deemed as dual-use and export-restricted, particularly if the resolution is 640 x 480 or greater, unless the refresh rate is 9 Hz or less. The export of thermal cameras is regulated by International Traffic in Arms Regulations.

In uncooled detectors the temperature differences at the sensor pixels are minute; a 1 °C difference at the scene induces just a 0.03 °C difference at the sensor. The pixel response time is also fairly slow, at the range of tens of milliseconds.

Thermography finds many other uses. For example, firefighters use it to see through smoke, find people, and localize hotspots of fires. With thermal imaging, power line maintenance technicians locate overheating joints and parts, a telltale sign of their failure, to eliminate potential hazards. Where thermal insulation becomes faulty, building construction technicians can see heat leaks to improve the efficiencies of cooling or heating air-conditioning.

Hot hooves indicate a sick cow

Thermal imaging cameras are also installed in some luxury cars to aid the driver (Automotive night vision), the first being the 2000 Cadillac DeVille.

Some physiological activities, particularly responses such as fever, in human beings and other warm-blooded animals can also be monitored with thermographic imaging. Cooled infrared cameras can be found at major astronomy research telescopes, even those that are not infrared telescopes.

Types[edit]

A thermographic image of a snake around an arm

Thermographic cameras can be broadly divided into two types: those with cooled infrared image detectors and those with uncooled detectors.

Cooled infrared detectors[edit]

A thermographic image of several lizards
Thermal imaging camera & screen, in an airport terminal in Greece. Thermal imaging can detect fever, one of the signs of infection.

Cooled detectors are typically contained in a vacuum-sealed case or Dewar and cryogenically cooled. The cooling is necessary for the operation of the semiconductor materials used. Typical operating temperatures range from 4 K to just below room temperature, depending on the detector technology. Most modern cooled detectors operate in the 60 K to 100 K range, depending on type and performance level.[24]

Without cooling, these sensors (which detect and convert light in much the same way as common digital cameras, but are made of different materials) would be 'blinded' or flooded by their own radiation. The drawbacks of cooled infrared cameras are that they are expensive both to produce and to run. Cooling is both energy-intensive and time-consuming.

The camera may need several minutes to cool down before it can begin working. The most commonly used cooling systems are rotary Stirling engine cryocoolers. Although the cooling apparatus is comparatively bulky and expensive, cooled infrared cameras provide superior image quality compared to uncooled ones.

Additionally, the greater sensitivity of cooled cameras also allow the use of higher F-number lenses, making high performance long focal length lenses both smaller and cheaper for cooled detectors. An alternative to Stirling engine coolers is to use gases bottled at high pressure, nitrogen being a common choice. The pressurised gas is expanded via a micro-sized orifice and passed over a miniature heat exchanger resulting in regenerative cooling via the Joule–Thomson effect. For such systems the supply of pressurized gas is a logistical concern for field use.

Materials used for cooled infrared detection include photodetectors based on a wide range of narrow gap semiconductors including:

Infrared photodetectors can be created with structures of high band gap semiconductors such as in Quantum well infrared photodetectors.

A number of superconducting and non-superconducting cooled bolometer technologies exist.

In principle, superconducting tunneling junction devices could be used as infrared sensors because of their very narrow gap. Small arrays have been demonstrated. Their wide range use is difficult because their high sensitivity requires careful shielding from the background radiation.

Superconducting detectors offer extreme sensitivity, with some able to register individual photons. For example, ESA's Superconducting camera (SCAM). However, they are not in regular use outside of scientific research.

Uncooled infrared detectors[edit]

Uncooled thermal cameras use a sensor operating at ambient temperature, or a sensor stabilized at a temperature close to ambient using small temperature control elements. Modern uncooled detectors all use sensors that work by the change of resistance, voltage or current when heated by infrared radiation. These changes are then measured and compared to the values at the operating temperature of the sensor.

Uncooled infrared sensors can be stabilized to an operating temperature to reduce image noise, but they are not cooled to low temperatures and do not require bulky, expensive, energy consuming cryogenic coolers. This makes infrared cameras smaller and less costly. However, their resolution and image quality tend to be lower than cooled detectors. This is due to differences in their fabrication processes, limited by currently available technology. An uncooled thermal camera also needs to deal with its own heat signature.

Uncooled detectors are mostly based on pyroelectric and ferroelectric materials[25] or microbolometer technology. The material are used to form pixels with highly temperature-dependent properties, which are thermally insulated from the environment and read electronically.

Thermal image of steam locomotive

Ferroelectric detectors operate close to phase transition temperature of the sensor material; the pixel temperature is read as the highly temperature-dependent polarization charge. The achieved NETD of ferroelectric detectors with f/1 optics and 320x240 sensors is 70-80 mK. A possible sensor assembly consists of barium strontium titanate bump-bonded by polyimide thermally insulated connection.

Silicon microbolometers can reach NETD down to 20 mK. They consist of a layer of amorphous silicon, or a thin film vanadium(V) oxide sensing element suspended on silicon nitride bridge above the silicon-based scanning electronics. The electric resistance of the sensing element is measured once per frame.

Current improvements of uncooled focal plane arrays (UFPA) are focused primarily on higher sensitivity and pixel density. In 2013 DARPA announced a five-micron LWIR camera that uses a 1280 x 720 focal plane array (FPA).[26] Some of the materials used for the sensor arrays are:[27]

Applications[edit]

The thermographic camera on a Eurocopter EC135 helicopter of the German Federal Police.

Originally developed for military use during the Korean War,[citation needed] thermographic cameras have slowly migrated into other fields as varied as medicine and archeology. More recently, the lowering of prices have helped fuel the adoption of infrared viewing technology. Advanced optics and sophisticated software interfaces continue to enhance the versatility of IR cameras.

Infrared image of the galactic center taken by Hubble Telescope.[30]

Specifications[edit]

Some specification parameters of an infrared camera system are:

See also[edit]

References[edit]

  1. ^ W. Herschel, "Experiments on the refrangibility of the visible rays of the sun", Philosophical Transactions of the Royal Society of London, vol. 90, pp. 284–292, 1800.
  2. ^ S. P. Langley, "The bolometer," in Vallegheny Observatory, The Society Gregory, New York, NY, USA, 1880.
  3. ^ L. Bellingham, "Means for detecting the presence at a distance of icebergs, steamships, and other cool or hot objects," US patent no. 1,158,967.
  4. ^ Parker (R.D.)- Thermic balance or radiometer. U.S. Patent No 1,099,199 June 9, 1914
  5. ^ Barker (G.A.) – Apparatus for detecting forest fires. U.S. Patent No 1,958,702 May 22, 1934
  6. ^ Nichols (G.T.) – Temperature measuring. U.S. Patent No 2,008,793 July 23, 1935
  7. ^ Naughton, Russell (10 August 2004). "Kalman Tihanyi (1897–1947)". Monash University. Archived from the original on 24 October 2003. Retrieved 15 March 2013. 
  8. ^ "Texas Instruments - 1966 First FLIR units produced". ti.com. 
  9. ^ a b Kruse, Paul W., and David Dale Skatrud. Uncooled Infrared Imaging Arrays and Systems. San Diego: Academic, 1997. Print.
  10. ^ Gibson, Chris (2015). Nimrod's Genesis. Hikoki Publications. pp. 25–26. ISBN 978-190210947-3. 
  11. ^ "Michael F. Tompsett, TheraManager". uspto.gov. 
  12. ^ C. Corsi, "Smart sensors," Microsystem Technologies, pp. 149–154, 1995.
  13. ^ A. Moini, "Vision chips or seeing silicon," Tech. Rep. 8, Department Electrical & Electronics Engineering, The University of Adelaide, Adelaide, Australia, 1998.
  14. ^ National patent no. 47722◦/80.
  15. ^ A. Rogalski, "IR detectors: status trends," Progress in Quantum Electronics, vol. 27, pp. 59–210, 2003.
  16. ^ C. Corsi, "History highlights and future trends of infrared sensors," Journal of Modern Optics, vol. 57, no. 18, pp. 1663–1686, 2010.
  17. ^ C. Corsi, "Rivelatori IR: stato dell’arte e trends di sviluppo futuro," Atti della Fondazione Giorgio Ronchi, vol. XLVI, no.5, pp. 801–810, 1991.
  18. ^ L. J. Kozlowski and W. F. Kosonocky, "Infrared detector arrays," in Hand-Book of Optics, M. Bass, Ed., chapter 23, Williams,W. L.Wolfe, and McGraw-Hill, 1995.
  19. ^ C. Corsi, "Future trends and advanced development in I.R. detectors," in Proceedings of 2nd Joint Conference IRIS-NATO,London, UK, June 1996.
  20. ^ M. Razeghi, "Current status and future trends of infrared detectors," Opto-Electronics Review, vol. 6, no. 3, pp. 155–194, 1998.
  21. ^ A. Rogalski, "IR detectors: the next millennium," in International Conference on Solid State Crystals 2000 Epilayers and Heterostructures in Optoelectronics and Semiconductor Technology, vol. 4413 of Proceedings of SPIE, pp. 307–322,October 2000.
  22. ^ Corsi, Carlo. "Infrared: A Key Technology for Security Systems." Advances in Optical Technologies 2012 (2012): 1-15.
  23. ^ Thermal camera answers age-old question by Fraser Macdonald, 4 October 2014, Hot Stuff
  24. ^ "Infrared Technology". thermalscope.com. Archived from the original on 8 November 2014. Retrieved 1 November 2014. 
  25. ^ "Hot detectors". spie.org. 
  26. ^ "DARPA developing personal LWIR cameras to give soldiers heat vision". gizmag.com. 
  27. ^ "Thermal detector with preferentially-ordered thermally sensitive element and method - Raytheon Company". freepatentsonline.com. 
  28. ^ "Thermal imaging highlights Westminster's energy waste". IRT Surveys. 19 February 2013. Retrieved 15 March 2013. 
  29. ^ "Thermal Imaging Application Overview". Bullard. Archived from the original on 16 September 2008. Retrieved 15 March 2013. 
  30. ^ "The galactic centre". Retrieved 1 April 2016. 
  31. ^ "Thermal Image Sensor for Data Center". ServersCheck. Retrieved 2016-10-07. 

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license