Fiber Optic Pyrometer is a temperature sensor based on the principle of infrared black body radiation, using black body cavity and fiber optic sensor probe for high temperature measurement. Compared with the thermocouple thermometers made of platinum, rhodium and other precious metals that are widely used in industrial production, it has the advantages of anti-oxidation, anti-electromagnetic interference, corrosion resistance, long-distance transmission, and low price. It is an excellent substitute for platinum and rhodium thermocouples, and has a wide range of application prospects in industrial production.

The main technical content and basic principles of Fiber Optic Pyrometer, usually Fiber Optic Pyrometer temperature measurement can be achieved by radiant intensity method or colorimetric temperature measurement. The radiation temperature measurement method is based on the principle of black body radiation. When the wavelength λ is constant, the radiation intensity of the black body. The influence of other absorbers and other factors in the measurement environment will affect the measurement accuracy. The principle of colorimetric temperature measurement is to use the principle that for any two wavelengths λ, the ratio of the radiation intensity changes with the change of temperature. : Using the colorimetric method, it is necessary to select two specific wavelengths of the black body radiation light transmitted in the optical fiber and divide it into two paths. This kind of light source device with more than one optical path port related to the wavelength is called a wavelength division multiplexing splitter. The biggest advantage of using the colorimetric method is that it can eliminate the influence of environmental and radiation source changes on the measurement accuracy. Fiber Optic Pyrometer adopts the principle of colorimetry, and its main technical content includes blackbody cavity radiation, optical fiber filtering and colorimetric temperature measurement.

The Fiber Optic Pyrometer measurement system is composed of black body cavity, fiber sensor, transmission fiber, splitter, photoelectric conversion, and secondary instrument. The working principle of Fiber Optic Pyrometer is that the black body radiation cavity senses the temperature of the object to be measured and emits radiation light waves. After division multiplexing converts the radiant light signals into electrical signals, the temperature is calculated by the secondary meter.

Fiber Optic Pyrometer uses a ceramic black body cavity as a probe, which has stable anti-corrosion, physical and chemical properties, so it has a long service life; anti-electromagnetic interference, safe to use in flammable and explosive situations, because fiber optic pyrometer transmits optical signals, , High current, strong magnetic field, strong radiation, etc. are not disturbed, ensuring measurement accuracy, and no electric sparks are generated. It is suitable for use in flammable and explosive occasions. This is a problem that thermocouples cannot solve; it is convenient to realize long-distance signal transmission.