What is the mechanism of infrared radiation temperature measurement?
All objects with a temperature higher than zero (-273.15°C) are constantly emitting infrared energy to the surrounding space. Its radiation characteristics, radiant energy size, wavelength distribution, etc. are closely related to the surface temperature of the object. Conversely, by measuring the infrared energy radiated by the object itself, its surface temperature can be accurately determined, which is the mechanism of infrared radiation temperature measurement.
Like other organisms, the human body also radiates and releases infrared energy to its surroundings. Its wavelength is generally 9-13 μm, which is in the near-infrared band of 0.76-100 μm. Because the light in this wavelength range is not absorbed by the air, that is to say, the infrared radiation emitted by the human body has nothing to do with the influence of the environment, but is related to the energy stored and released by the human body. Therefore, as long as the infrared energy radiated to the human body itself The measurement of the human body can accurately determine the surface temperature of the human body. The human body infrared temperature sensor is designed and manufactured according to this principle.
Working process of infrared thermometer: infrared thermometer is composed of optical system, photoelectric detector, signal amplifier, signal processing, display output and other parts. The optical system collects the target infrared radiation energy in its field of view, and the size of the field of view is determined by the optical parts and position of the thermometer. The infrared radiated by the measured object first enters the optical system of the thermometer, and then the optical system converges the incoming infrared rays to make the energy more concentrated; the gathered infrared rays are input into the photodetector, and the key component of the detector is the infrared sensor. Its task is to convert the optical signal into an electrical signal; the electrical signal output from the photodetector is converted into the temperature value of the measured target after being corrected by the amplifier and signal processing circuit according to the internal algorithm of the instrument and the target emissivity.
