Thermal Image cameras .how do they work?
Different parts of your body give off certain amounts of heat. The cameras pick this up. The warmest parts show as yellow or orange (your head, the palms or your hands) and the coldest parts are blue or red (your fingers and nose)
Rather than look for the visible light detected by normal cameras they detect infra-red light (AKA heat).
You use Infra Red rays.
When u are warm ur sjin turns more red the red light is then asorbed by the body and shows it red on the screen.
they work by seeing the heat of our body
A thermographic camera, sometimes called a FLIR (Forward Looking InfraRed), or an infrared camera less specifically, 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 450–750 nanometre range of the visible light camera, infrared cameras operate in wavelengths as long as 14,000 nm
An infrared camera is a non-contact device that detects infrared energy (heat) and converts it into an electronic signal, which is then processed to produce a thermal image on a video monitor and perform temperature calculations. Heat sensed by an infrared camera can be very precisely quantified, or measured, allowing you to not only monitor thermal performance, but also identify and evaluate the relative severity of heat-related problems. Recent innovations, particularly detector technology, the incorporation of built-in visual imaging, automatic functionality, and infrared software development, deliver more cost-effective thermal analysis solutions than ever before.
Infrared energy is just one part of the Electromagnetic Spectrum that encompasses radiation from gamma rays, x-rays, ultra violet, a thin region of visible light, infrared, radar, tv 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 is, the more infrared radiation as black-body radiation it emits. A special camera can detect this radiation in a way similar to an ordinary camera does 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.
Images from infrared cameras tend to be monochromatic because the cameras are generally designed with only a single type of sensor responding to single wavelength range of infrared radiation. Color cameras require a more complex construction to differentiate wavelength 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 false-color, where changes in color are used rather than changes in intensity to display changes in the signal. This 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. This technique is called density slicing.
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 blue. A scale should be shown next to a false color image to relate colors to temperatures. Their resolution is considerably lower than of optical cameras, mostly only 160x120 or 320x240 pixels. Thermographic cameras are much more expensive than their visible-spectrum counterparts, and higher-end models are often deemed as dual-use and export-restricted.
Thermal imaging photography finds many other uses. For example, firefighters use it to see through smoke, find persons, 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. Thermal imaging cameras are also installed in some luxury cars to aid the driver, the first being the 2000 Cadillac DeVille. Some physiological activities, particularly responses, in human beings and other warm-blooded animals can also be monitored with thermographic imaging. Cooled infrared cameras can also be found at most major astronomy research telescopes.
The heart of IR cameras is the micro bolometer.
An array of these on a chip works like CCD in a video camera but is sensitive only to infrared radiation (light).
they pick up the electrical magnetic radiation (EMR) ommiting from the target.
everything on the earth emmits EME (electro magnetic energy) TIcameras turn that into a visible picture
simple explination but not full of dhgwdv
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