Timeline for How thermographic camera works?
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Feb 22, 2016 at 23:22 | comment | added | Trebia Project. | @CuriousOne arg... the explanation of the physical principle is actually in the description of a material!!! Sometimes wikipedia is kind of odd... | |
| Feb 22, 2016 at 23:14 | comment | added | CuriousOne | Narrow gap semiconductors work pretty much the same way as silicon does (notice the handwaving!), just the band gap is smaller, i.e. it takes less photon energy to separate an electron and a hole. In silicon that's approx. 1.1eV, in Germanium it's still 0.67eV. PbSe gets us to 0.27eV, InSb to 0.17eV at room temperature and 0.23eV at 80K. en.wikipedia.org/wiki/Mercury_cadmium_telluride has a variable band gap and can seemingly be used down to $12\mu m$ wavelength... much beyond that it's probably better to use bolometers. | |
| Feb 22, 2016 at 23:07 | comment | added | Trebia Project. | @CuriousOne that's the point. Wikipedia ir really poor describing how that narrow-gap semiconductor is really working. Everything googling are books. Bolometer looks easier to understand (however, how temperature is measured in a surface?) | |
| Feb 22, 2016 at 22:58 | comment | added | CuriousOne | See en.wikipedia.org/wiki/Thermographic_camera. These cameras use cooled, narrow-gap semiconductor sensors (similar to a CCD or a CMOS chip in cameras for visible light) or bolometer arrays. A bolometer is basically a very sensitive thermometer that reacts to radiation heating it. | |
| Feb 22, 2016 at 22:54 | history | asked | Trebia Project. | CC BY-SA 3.0 |