A broadband colorimetric filter sapphire fiber optic black body temperature sensor demodulation device
A demodulation device and technology of black body temperature, applied in thermometers, measuring devices, thermometers with physical/chemical changes, etc., can solve the problem of weak dynamic range, affecting the demodulation accuracy of temperature signals, and low signal-to-noise ratio of optical signal strength measurement results and other issues to achieve the effect of improving the sensitivity
Active Publication Date: 2020-08-14
BEIJING RES INST OF TELEMETRY +1
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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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[0025] The present invention will be further described below in conjunction with the accompanying drawings.
[0026] In one embodiment of the present invention, for a sapphire optical fiber 1 with a core diameter of 125 μm, a structure such as figure 1 The sapphire fiber optic black body radiation temperature sensor demodulation device shown. The black body radiation optical signal output by the tail section of the sapphire fiber 1 is coupled to the quartz transmission fiber 3 through the variable core diameter fiber 2. The quartz transmission fiber 3 is a 105 / 125 μm multimode fiber, which is consistent with the core diameter of the tail fiber of other optical components in the demodulation device. The blackbody radiated optical signal enters the 1×2 optical fiber WDM4 through the quartz transmission optical fiber 3 from the optical fiber port 4A, and is output from the pigtails 4B and 4C at the two output ends respectively. Optical fiber WDM4 has broadband filtering characte...
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The invention discloses a broadband colorimetric filtering sapphire optical fiber black body temperature sensor demodulation device. The device filters the sapphire optical fiber black body radiated optical signal by using a combination of broadband high-pass and low-pass wavelength filters to obtain short-wave and long-wave two-way light. signal, and the intensity is detected by the photodetector respectively, and the corresponding relationship between the short-wave and long-wave optical signal intensity ratio and the temperature detected by the sensor can realize the demodulation of the temperature signal. By adjusting the combination of broadband high-pass and low-pass wavelength filters The filtering effect of optical fiber blackbody radiated optical signal can improve the slope of the short-wave and long-wave optical signal intensity ratio with the temperature signal, thereby improving the temperature demodulation sensitivity.
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 ...
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IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 李金洋史青尹东毛国培赵光再何文涛
Owner BEIJING RES INST OF TELEMETRY