But these detectors are more complex than visible spectrum cameras, since they themselves emit infrared radiation... This is the infraredspectrum, a light radiation whose wavelengths vary between around 1 and 30 micrometers... Infrared detectors resemble, as far as their principle is concerned, the video-cameras that we use for the visible spectrum
In this image with artificial colors, the red corresponds to the light emitted in the near infraredspectrum... To obtain the image at the top of the page, we displayed the image corresponding to a wavelength in the near infraredspectrum in red... The light spectrum, from ultraviolet to infrared, going through all the colors of the rainbow