The following describes the basic knowledge of infrared:
[infrared ray]
Infrared is one of the many invisible rays in the sun's rays. The wavelength of infrared
rays in the solar spectrum is greater than that of visible rays, with a wavelength
of 0.75 to 1000 μm. Infrared rays can be divided into three parts, namely near-infrared rays,
which have a wavelength between 0.75 and 1.50 μm; mid-infrared rays, which have a
wavelength between 1.50 and 6.0 μm; and far-infrared rays, which have a
wavelength between 6.0 and 1,000 μm.
According to tests, infrared rays can reach more than 40% in natural light radiation
The CCD or CMOS used in digital cameras can sense infrared rays.
840k series (including spc 900nc) camera uses SONY IC098BQ CCD
The sensitivity curve is as follows: