Optical fiber ultra-high-temperature thermodetector based on colorimetric method

Abstract

The invention discloses an optical fiber ultra-high-temperature thermodetector based on a colorimetric method. The optical fiber ultra-high-temperature thermodetector is characterized in that an optical fiber coupling lens couples infrared light radiated by a target to an armored energy transmission optical fiber for optical signal transmission, preliminary filtering is performed on the infrared light through a wide-band-pass optical filter, the infrared light waveband radiated by the target is limited, and then the infrared light enters a light splitting system, so that the purpose of equallydividing light into two paths is achieved; the two paths of light respectively pass through two optical filters with moderate central wavelength difference and then respectively reach a photoelectricdetector; and the photoelectric detector converts the optical signal into an electric signal, the electric signal is processed by a series of processes and finally processed by a lower computer, anda final temperature result is output and displayed on a display device. The optical fiber ultra-high temperature thermodetector based on the colorimetric method provided by the invention can realize atemperature test of 500 DEG C and 5000 DEG C, has the advantages of short response time, no contact, safety in use, long service life and the like, and has the characteristics of high sensitivity, large temperature measurement range and the like.

Description

technical field [0001] The invention relates to the technical field of temperature measurement, in particular to an optical fiber ultra-high temperature thermometer based on colorimetry. Background technique [0002] In the fields of metal smelting, ceramic firing and scientific research, efficient and accurate measurement and monitoring of product surface temperature during the production process is one of the important links to ensure product quality; in the field of engines, especially in the field of aero engines, in order to ensure the The stability of its own performance and the improvement of its service life require accurate testing of the temperature of the high-speed running blades; in the field of scientific research, the space shuttle conducts temperature tests on the temperature characteristics of the atmosphere, the development of new processes, and new materials. And control, these are inseparable from the precise test of ultra-high temperature. [0003] At p...

AI Technical Summary

Problems solved by technology

This method can realize the test of temperature distribution, but the disadvantage is that the structure is complex, the spatial resolution is not high, and there is no restriction on the specific band used.

Invention patent 201410561766.7 discloses a fiber optic radiation thermometer based on colorimetry. Although the thermometer can realize the measurement of the thermal field of the crystal furnace, it uses silicon-based photodiodes (working at 400-1100nm) and InGaAs-based photodiodes (Working at 800-1700nm), no filter is used for spectral limitation, and the difference between the two bands is large, the impact of the target emissivity cannot be ignored, which will affect the test results. Natural light will have a great influence on test results

Working at 1.58μm, InGaAs-based photodetectors may be used, while the detection of bands larger than 2.0μm has more detectors, so it is impossible to guess

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