Basic theory of infrared thermometer In 1672, it was discovered that the sunlight (white light) is composed of light of various colors. At the same time, Newton made the famous conclusion that monochromatic light is simpler in nature than white light. Using a spectroscopic prism, the sunlight (white light) is decomposed into red, orange, yellow, green, cyan, blue, and purple colors. In 1800, the British physicist FW Hegel discovered infrared rays when he studied various colors from the hot point of view. When studying the heat of various shades of light, he deliberately blocked the only window in the darkroom with a dark plate, and opened a rectangular hole in the plate, and installed a beam splitter prism in the hole. When the sunlight passes through the prism, it is decomposed into colored light bands, and the thermometer is used to measure the heat contained in the different colors in the light band. In order to compare with the ambient temperature, Hessler used several thermometers placed near the colored light band as a comparison thermometer to measure the ambient temperature. In the experiment, he stumbled upon a strange phenomenon: A thermometer placed outside the red light was higher than the other indoor temperature.
After repeated experiments, this so-called high-temperature, high-temperature zone is always located outside the red light at the extreme edge of the strip. So he announced that in addition to visible light, the sun emits a kind of “hotline†that is invisible to the human eye. This invisible “hotline†is located outside the red light, called infrared light. Infrared is an electromagnetic wave, which has the same essence as radio waves and visible light. The discovery of infrared rays is a leap of human understanding of nature, and it opens up a whole new broad road for research, utilization and development (infrared thermometer) infrared technology.
The wavelength of infrared rays is between 0.76 and 100 μm. According to the range of wavelengths, it can be divided into four categories: near-infrared, mid-infrared, far-infrared, and far-infrared. Its position in the continuous spectrum of electromagnetic waves is in the area between radio waves and visible light. . Infrared radiation is one of the most widespread electromagnetic radiations in nature. It is based on the random movement of any molecule and atom that produces its own environment and constantly radiates out thermal infrared energy, movement of molecules and atoms. The more intense, the greater the energy of radiation, and conversely, the smaller the energy of radiation.
Objects whose absolute temperature is above zero will emit infrared rays due to their own molecular motion. After the infrared detector is used to convert the power signal radiated by the object into an electric signal, the output signal of the imaging device can completely simulate the spatial distribution of the surface temperature of the scanned object, processed by the electronic system, and transmitted to the display screen. Thermal image of the surface of the object corresponding to the thermal image. Using this method, we can achieve long-distance thermal state image imaging and temperature measurement and analysis and judgment.
After repeated experiments, this so-called high-temperature, high-temperature zone is always located outside the red light at the extreme edge of the strip. So he announced that in addition to visible light, the sun emits a kind of “hotline†that is invisible to the human eye. This invisible “hotline†is located outside the red light, called infrared light. Infrared is an electromagnetic wave, which has the same essence as radio waves and visible light. The discovery of infrared rays is a leap of human understanding of nature, and it opens up a whole new broad road for research, utilization and development (infrared thermometer) infrared technology.
The wavelength of infrared rays is between 0.76 and 100 μm. According to the range of wavelengths, it can be divided into four categories: near-infrared, mid-infrared, far-infrared, and far-infrared. Its position in the continuous spectrum of electromagnetic waves is in the area between radio waves and visible light. . Infrared radiation is one of the most widespread electromagnetic radiations in nature. It is based on the random movement of any molecule and atom that produces its own environment and constantly radiates out thermal infrared energy, movement of molecules and atoms. The more intense, the greater the energy of radiation, and conversely, the smaller the energy of radiation.
Objects whose absolute temperature is above zero will emit infrared rays due to their own molecular motion. After the infrared detector is used to convert the power signal radiated by the object into an electric signal, the output signal of the imaging device can completely simulate the spatial distribution of the surface temperature of the scanned object, processed by the electronic system, and transmitted to the display screen. Thermal image of the surface of the object corresponding to the thermal image. Using this method, we can achieve long-distance thermal state image imaging and temperature measurement and analysis and judgment.
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