infrared photography

infrared photography
Photography employing an optical system and direct image recording on film sensitive to near-infrared wavelength (infrared film). This should not be confused with infrared imagery. The term infrared photography is misleading, in that the infrared portion of the spectrum extends approximately from 0.7 to 300 microns in wavelength. Infrared photography, on the other hand, normally includes wavelengths no greater than 1 micron. The recording of near infrared (i.e., at wavelengths between 0.7 and 1.5 microns) does not differ significantly from the recording of visible radiation and is called near infrared to distinguish it from imagery obtained with longer wavelengths of infrared energy.

Aviation dictionary. 2014.

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