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2. Infrared - Wikipedia

   en.wikipedia.org/wiki/Infrared

   Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with waves that are just longer than those of red light (the longest waves in the visible spectrum ), so IR is invisible to the human eye.

3. Model 1981 "Shin'heung" - Wikipedia

   en.wikipedia.org/wiki/Model_1981_"Shin'heung"

   Right side of a T-62 tank showing the large L-2 Luna IR spotlight similar to the upgraded PT-85 tank. Early examples of the Model 1981 "Shin'heung" tank have shown a 9M14 Malyutka (AT-3 "Sagger") anti-tank guided missile installed on top of the turret directly above the main gun, and with two lights on the front of either side of the hull. [2]

4. Infrared spectroscopy - Wikipedia

   en.wikipedia.org/wiki/Infrared_spectroscopy

   Fourier transform infrared (FTIR) spectroscopy is a measurement technique that allows one to record infrared spectra. Infrared light is guided through an interferometer and then through the sample (or vice versa). A moving mirror inside the apparatus alters the distribution of infrared light that passes through the interferometer.

5. Optical rectenna - Wikipedia

   en.wikipedia.org/wiki/Optical_rectenna

   Figure 1. Spectral irradiance of wavelengths in the solar spectrum. The red shaded area shows the irradiance at sea level. There is less irradiance at sea level due to absorption of light by the atmosphere. An optical rectenna is a rectenna (rectifying antenna) that works with visible or infrared light. [1]

6. Infrared search and track - Wikipedia

   en.wikipedia.org/wiki/Infrared_search_and_track

   Any IR light falling on the sensor would generate a "pip" on the display, in a fashion similar to the B-scopes used on early radars. The display was primarily intended to allow the radar operator to manually turn the radar to the approximate angle of the target, in an era when radar systems had to be "locked on" by hand.

7. Infrared lamp - Wikipedia

   en.wikipedia.org/wiki/Infrared_lamp

   Infrared lamps are also used for some night vision devices where visible light would be objectionable. Infrared lamp sources are used in certain scientific and industrial instrument for chemical analysis of liquids and gases; for example, the pollutant sulfur dioxide in air can be measured using its infrared absorption characteristics.