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Hmm, yeah the more I look at the image the more I think that the photo is just for illustrative purposes. That would make sense if it really was thermal because then all you would see are those oval heat spot things in the image instead of the people's shoes and shirts and everything.AllVol said:I doubt the detector depicted at the website is a camera, the photo shown being only for illustrative purposes. The description clearly states the device is thermal, and as Dk states, visual detail could not be seen.
philba said:actually, most digital camera sensors respond to IR. Most have an IR filter. If you removed that and replaced it with a filter that passed IR but not visible light, you would get bright spots where there is IR.
now, the reason the thermal imaging detector is expensive is more likely due to the fact that it does some image processing. the text says it can detect into and out of the detect area and maintain counts.
Because of terahertz radiation's ability to penetrate fabrics and plastics it can be used in surveillance, such as security screening, to uncover concealed weapons on a person, remotely. This is of particular interest because many materials of interest, such as plastic explosives, exhibit unique spectral fingerprints in the terahertz range. This offers the possibility of combining spectral identification with imaging. Some controversy surrounds the use of terahertz scanners for routine security checks due to the potential capability to produce detailed images of a subject's body through clothing.