why inferared light is used in cctv camera
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Your camera is based upon Si, which has a
bandgap of 1.12 eV which means that for
light that is ~ 1.1 u and shorter the camera
can possibly detect it. This range of
wavelengths is in the part of the spectrum
called Near-IR . You eyes cannot see
wavelengths LONGER than 720 nm.
bandgap of 1.12 eV which means that for
light that is ~ 1.1 u and shorter the camera
can possibly detect it. This range of
wavelengths is in the part of the spectrum
called Near-IR . You eyes cannot see
wavelengths LONGER than 720 nm.
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