Fiber grating sensor calibration device based on liquid nitrogen conduction cooling

Abstract

The invention provides a fiber grating sensor calibration device based on liquid nitrogen conduction cooling, and belongs to the technical field of sensor calibration devices. A liquid storage barrelcover is arranged at the top of a liquid storage barrel, a heat insulation device is arranged at the bottom of the liquid storage barrel, and a temperature regulating barrel is arranged above the heatinsulation device; an isolating tube is arranged in the temperature regulating barrel, and the lower end of the isolating tube penetrates through the bottom of the temperature regulating barrel and communicates with the insulating device; a fixing rod penetrates through the isolating tube and is movably inserted into the heat insulation device; a fiber grating sensor and a temperature reference sensor are arranged in the fixing rod; and a first pipeline and a second pipeline are arranged on the liquid storage barrel cover, and liquid nitrogen is added into the liquid storage barrel and the temperature regulating barrel respectively. The fiber grating sensor is calibrated in a liquid nitrogen conduction refrigeration mode, and the calibration of the fiber grating sensor in the temperaturerange of 77 to 293 K is realized; and the fiber grating sensor and the temperature reference sensor can be conveniently and safely laid into a temperature change device, the leakage heat is reduced through isolation, and the temperature of the sensor is easier to reach 77 K.

Description

technical field [0001] The invention relates to the technical field of sensor calibration devices, in particular to a fiber grating sensor calibration device based on liquid nitrogen conduction cooling. Background technique [0002] Due to its small size, light weight, anti-electromagnetic interference, and easy reuse, fiber grating sensors are considered to be sensor devices that can replace traditional electrical signal sensors in the field of high-temperature superconducting magnets. The application of fiber grating sensors in the field of superconductivity is mainly to measure temperature and strain. [0003] According to the principle of the sensor, when using the sensor for absolute temperature measurement, the sensor must be calibrated for temperature. Different from other types of fiber optic sensors, the fiber Bragg grating sensor is a sensor for wavelength demodulation. The broadband light source emits a beam of light, which passes through the transmission fiber a...

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Problems solved by technology

However, the price of general refrigerators is relatively expensive, and it takes a long time to heat up and down, and there is no unique design for sensor laying

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