Sapphire optical fiber blackbody cavity high-temperature sensor and temperature measurement method thereof

Abstract

The invention discloses a sapphire optical fiber blackbody cavity high-temperature sensor and a temperature measurement method thereof, and is applicable to the field of high-temperature measurement. The sensor comprises a sapphire optical fiber blackbody cavity sensing head, an energy transmitting optical fiber, a photoelectric detector, a pre-amplifying module, an AD sampling module, a signal processing module and a display module. A sapphire optical fiber blackbody cavity has the radiation characteristic approximate to that of an ideal blackbody, thermal radiation energy of a temperature field can be transmitted to the photoelectric detector by the energy transmitting optical fiber to be converted into an electric signal, the electric signal is acquired by the AD sampling module, the signal processing module analyzes and calculates a sampled digital signal, and finally, by data fitting and calibration, a corresponding function relationship between a temperature and the electric signal is obtained so as to implement measurement on the temperature. The sapphire optical fiber blackbody cavity high-temperature sensor disclosed by the invention is simple in system structure and convenient to use.

Description

Technical field [0001] The invention belongs to the field of optical fiber temperature sensing, and relates to a sapphire optical fiber black body cavity sensor that can be used to continuously measure high temperatures, in particular to a sensor radiation temperature measurement method. Background technique [0002] The radiation thermometer calculates the corresponding temperature by non-contact measurement of the energy of thermal radiation, so it has been widely used in the fields of industry and scientific research. It has the advantages of high temperature measurement accuracy and good repeatability, and is widely used in high temperature measurement. For example, the MS / MI series infrared thermometers of Germany Saiteng have a system accuracy of 0.5% of the measured value in the range of 1500°C to 2500°C, a repeatability of 0.1% of the measured temperature value +1K, and a temperature resolution of 0.1°C. Although non-contact infrared temperature measurement can have a hi...

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Problems solved by technology

However, high-temperature thermocouples are generally made of precious metal materials. In high-temperature environments, thermocouples have disadvantages such as poor corrosion resistance, short life, and serious loss.

And it is difficult to work normally in the environment of strong corrosiveness and strong electromagnetic interference

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