Temperature Measurement Principle and Temperature Measurement Method of Infrared Temperature Sensor
Any object in nature as long as the temperature above the absolute zero, it will continue to radiation to the surrounding space. The higher the temperature, the more radiation energy. Any object can absorb, transmit or reflect radiant energy. Mastered the correspondence between the inside, you can know the temperature of the object, the radiation is based on this principle developed from the principle.
Radiation temperature sensor using a certain temperature of the object heat radiation principle made of radiation energy with the object temperature changes. In the application of radiation temperature sensor temperature detection, only the sensor at the measured object, do not have to contact with the measured object, are non-contact temperature. It does not damage the temperature field of the object to be measured, can measure the temperature of the moving object and the temperature of the small object to be measured; the sensor or thermal radiation detector does not have to reach the same temperature as the measured object, the upper limit of temperature is not affected by the sensor material Melting point limit; belonging to the passive temperature measurement (that is, no power); detection sensor and the measured object does not have to achieve thermal balance, short response time, detection speed, suitable for rapid temperature measurement.
Radiation temperature sensor temperature measurement methods are the following three:
First, the color temperature method
The colorimetric temperature is defined as the ratio of the spectral radiant energy of the blackbody at the wavelengths λ1 and λ2 to the ratio of the radiant energy of the object under these two wavelengths. At this time, the temperature of the blackbody is called the color temperature.
Second, the brightness temperature method
The brightness of the temperature is defined as: a measured body in the temperature T, the wavelength of time into the spectrum of radiation energy, equal to the blackbody at the same wavelength of the spectral radiation energy. The temperature of the blackbody is referred to as the brightness temperature of the object at that wavelength.
Third, the whole radiation temperature method
The theoretical basis for the whole radiometric temperature is the Steven-Boltzmann law. The total radiation temperature is defined as the temperature Tb of the blackbody is called the total radiation temperature of the object when the total energy of the radiation in the full wavelength range of a subject is equal to the total energy of the radiation in the full wavelength range of the blackbody.
The radiation temperature sensor three temperature measurement methods, color temperature measurement and brightness temperature measurement has a high accuracy. Colorimetric temperature measurement of anti-interference ability, to a certain extent, can eliminate the impact of power supply voltage and the impact of background stray light and so on. The whole radiation temperature is susceptible to background interference.
Radiation-type temperature sensors can measure temperatures up to 2500 degrees Celsius, which is unmatched by contact temperature sensors, and is the only measurement method in many temperature measurement applications. With regard to the study of radiant temperature sensors, the emphasis should be placed on the accuracy and stability of the measurements to minimize the impact of the surrounding environment on measurements.
