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The Method of Distinguishing Infrared Temperature Measurement Based on Infrared Principle

Release time:

2024-02-29

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Abstract

It is based on the measurement of a given wavelength K0 near a narrow spectral range of radiation with a blackbody calibration instrument to determine the temperature of the object, suitable for high temperature measurement.

According to the principle of infrared to identify several methods of infrared temperature measurement:

1. Brightness temperature measurement method

2. Large wavelength temperature measurement method

According to Wien's displacement law, the product of the blackbody radiation peak wavelength Kmax and the temperature T is a constant, and the temperature T is calculated by measuring the peak wavelength Kmax. This method is commonly used to measure extremely high temperatures (greater than 2000°C). It can be seen that non-contact infrared temperature measurement has the following shortcomings: the measured temperature value is the surface temperature of the measuring object, and must be corrected by emissivity, which increases the complexity of the measurement; the influence of the surrounding medium causes the measurement error.

3. Multi-band temperature measurement method

A number of bands are taken in turn, and the temperature of the object is determined by calculating the complex relationship between the radiated power of these bands.

4. Dual-band temperature measurement method

It is based on measuring the ratio of the radiation power of two given wavelengths K1 and K2, and using a blackbody calibration instrument to determine the temperature of the object. It is suitable for measuring objects with changes in emissivity or unknown, but it is only suitable for measuring high-temperature objects with high radiation energy density. All three methods are described by Planck's law.

5. Full radiation thermometry

It is based on the measurement of wavelength from zero to infinity the total radiation power of the entire spectral range of objects with blackbody calibration instrument to determine the temperature of the object. The relationship between the total radiation power and the temperature of the measured object is described by the Stephen-Boltzmann law.

Key words:

Metallurgical sensor

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