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The useful infrared ray

[2011-11-23]

1, The discovery of infrared ray
Infrared light is also called infrared, it is a British scientist discovered. In 1800, Hershey Seoul in the study of sunlight, let the light through the prism divided into colored light with his band of light with a thermometer to measure the caloric content of different colors. Trial, he accidentally discovered a strange phenomenon: on the red light with a thermometer outside, other than the indoor temperature indication value high. Through trial and error, heat up the so-called high-temperature zone is always located at the red light with the outside edge. So he announced that in addition to solar radiation outside the visible light, invisible to the human eye there is a "hotline" that the human eye can not see the "hotline" is located outside of the red light, called infrared. (However, I want to clarify is the fact that the energy emitted by the sun in the green wavelength of 580nm the strongest.)
2, The application of infrared ray
As mentioned earlier, one of the main features of the infrared heat is stronger. So people use infrared rays heat objects. Household food infrared oven, infrared lamp to warm the bathroom heating, to the medical use of infrared therapy. According to previous theoretical introduction, we can easily imagine, if we can "see" infrared light, then we will see a bright world, every object in light. However, if an object's temperature than the ambient temperature is high, it may be brighter. So people thought at night is not the case of visible light, infrared imaging can be used, and the use of special means of IR image into the human eye can see visible light image, is the night vision. Important in the military night vision applications.
In fact, infrared technology, the first large-scale development, it originated in the First and Second World War during the night needs. Back in the late World War II, U.S. troops landed in Okinawa, Japan attacked the war, infrared night vision first debut, the stealthy attack on the genuineness of the Japanese soldiers see, trounced. "Sidewinder" is also typical in the military infrared applications. In addition, by measuring the intensity of infrared radiation the object or the measurement of body radiates infrared light of various wavelengths ratio can determine the temperature of the object. According to this theory developed for industrial use of infrared thermometers. As the infrared light from the atmospheric transmission of the non-contact infrared thermometer can measure the temperature of the object. Many modern anti-theft device, automatic lights, automatic faucet, automatic hand dryers, etc., in fact, most of the infrared radiation is detected after the action is executed.
Because the ability of infrared to penetrate fog and strong, the use of sensitive infrared sensors can detect very far away from the issue of infrared objects, and then by instrument handling, can show the shape and characteristics of the measured object, which is called infrared remote sensing. The use of satellite infrared remote sensing, surveying the earth can be implemented, in search of water, monitoring forest fires, a large area crop estimation and crop growing, weather forecasts, forecasting storms, cold and dust storms, and even predict earthquakes and so on. In short, we believe that, although the initial development of infrared technology due to the needs of war, but one the ability to broaden people's perception of the world of technology, is bound to make more contributions to the human will.