Optical fiber Bragg optical grating low-temperature sensor for simultaneously measuring strain and temperature and application method thereof

Abstract

The invention provides an optical fiber Bragg optical grating low-temperature sensor for simultaneously measuring strain and temperature and an application method of the optical fiber Bragg optical grating low-temperature sensor. The optical fiber Bragg optical grating low-temperature sensor comprises a base fixing screw (1), a measuring cavity (2), a strain optical fiber Bragg optical grating (3), a low-temperature adhesive (4), an upper-end optical fiber leading-out hole (5), a temperature-measuring optical fiber Bragg optical grating (6), a copper shell (7), a fixed base (8), a top cover screw (9), a lower-end optical fiber leading-out hole (10), a thin copper pipe (11), a fastening sleeve (12), an input / output optical fiber (13), an optical fiber continuing point (14) and a top end cover (15). The optical fiber Bragg optical grating low-temperature sensor for simultaneously measuring the strain and the temperature can be used for carrying out online monitoring on the strain and the temperature under the low-temperature environment of 77K-273K by the measurement on the wavelength displacement of the optical fiber Bragg optical grating.

Description

technical field [0001] The invention relates to an optical fiber Bragg grating low-temperature strain and temperature sensor for simultaneously measuring low-temperature strain and temperature and a use method thereof, belonging to the technical field of optoelectronic measurement. Background technique [0002] The superconducting magnetic energy storage device uses a superconducting coil as an energy storage coil, which is excited by the power grid through the converter, and stores the electric energy in the form of electromagnetic energy of LI2 / 2 in the coil magnetic field. When necessary, the electromagnetic energy is transferred by the inverter A new type of energy storage device that converts AC power back to the grid or provides it to other loads. The high-temperature superconducting magnetic energy storage device is mainly composed of superconducting magnets, cryogenic containers, cooling devices, current conversion devices and measurement and control systems. It work...

AI Technical Summary

Problems solved by technology

The substrate-encapsulated fiber Bragg grating strain sensor uses a polyimide film polymer substrate to package the bare fiber Bragg grating. Since there is no temperature compensation grating inside the sensor, an additional fiber Bragg grating temperature sensor needs to be connected in series to achieve temperature compensation; the thin stainless steel tube The packaged optical fiber Bragg grating low temperature sensor only uses a thin stainless steel tube with a large thermal expansion coefficient to encapsulate the bare optical fiber Bragg grating, and its exterior lacks effective packaging protection against external forces.

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