Broadband colorimetric filtering sapphire fiber blackbody temperature sensor demodulation device

Abstract

The invention discloses a broadband colorimetric filtering sapphire fiber blackbody temperature sensor demodulation device. According to the device, a broadband high-pass and low-pass wavelength filter combination is adopted to perform filtering on a sapphire fiber blackbody radiation optical signal to obtain a short-wave optical signal and a long-wave optical signal, intensity detection is performed on the short-wave optical signal and the long-wave optical signal through a photoelectric detector, temperature signal demodulation can be realized according to the corresponding relation betweenthe intensity ratio of the short-wave optical signal to the long-wave optical signal and sensor detection temperature, the slope of the intensity ratio, changing along with a temperature signal, of the short-wave optical signal to the long-wave optical signal can be improved by adjusting the filtering effect of the broadband high-pass and low-pass wavelength filter combination on the sapphire fiber blackbody radiation optical signal, and therefore temperature demodulation sensitivity is improved.

Description

technical field [0001] The invention relates to a broadband colorimetric filtering sapphire optical fiber blackbody temperature sensor demodulation device, which belongs to the field of optical fiber sensing. Background technique [0002] The sapphire fiber optic blackbody radiation temperature sensor is a new type of temperature sensor used for temperature measurement in ultra-high temperature conditions, and is expected to be used in various high-temperature environments such as gas turbines and metallurgical furnaces. Different from the traditional thermocouple temperature sensor, the sapphire fiber optic blackbody radiation temperature sensor uses sapphire fiber optics to receive the blackbody radiation light signal of the target object for sensing temperature, and has the advantages of anti-electromagnetic interference and high sensitivity. [0003] Colorimetric filtering is one of the typical methods for signal demodulation of sapphire fiber optic black body radiation ...

AI Technical Summary

Problems solved by technology

However, it should be pointed out that the black body radiation optical signal collected by the sapphire optical fiber is often very weak and has a large dynamic range. The traditional colorimetric filtering method uses a narrow-band filter, and only the optical signal near the target wavelength can enter the photodetector, resulting in the optical signal The signal-to-noise ratio of the intensity measurement results is low, which affects the demodulation accuracy of the temperature signal to a certain extent

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