Optical fiber curvature and temperature simultaneous measurement device based on anti-resonance and multimode interference

Abstract

The invention discloses an optical fiber curvature and temperature simultaneous measurement device based on combination of anti-resonance effect and multimode interference. The device comprises a broadband light source, a sensing structure and a spectrum analyzer which are sequentially connected through a single-mode optical fiber along the direction from signal input to signal output, and further comprises a curvature measurement module and a temperature measurement module. The sensing structure comprises a multimode optical fiber and a glass capillary which are connected in series, and the two ends of the sensing structure are connected with single-mode optical fibers; the curvature measurement module comprises a fixed base and a translation table, the curvature measurement module further comprises two optical fiber supports which are installed on the fixed base and the translation table respectively, the sensing structure is connected between the two optical fiber supports through single-mode optical fibers at the two ends, and the translation table drives the optical fiber supports fixed to the translation table to move in a stepping mode; the bending radius of the multimode optical fiber is changed; and the temperature measurement module comprises an incubator and a temperature controller which are connected, and the temperature of the incubator is controlled through the temperature controller so as to control the environment temperature of the sensing structure.

Description

technical field [0001] The invention relates to the technical field of optical fiber temperature sensors, in particular to a device for simultaneous measurement of optical fiber curvature and temperature based on the combination of anti-resonance effect and multi-mode interference. Background technique [0002] In recent decades, optical fiber sensors represented by gratings, interferometers, and cascaded interferometers have played an important role in the fields of physics, biology, and chemistry. Among them, linear optical fiber sensors are characterized by their small size, strong structure, and low cost. It has attracted wide attention due to its excellent properties. In practical engineering applications, new requirements have been put forward for the single-point multi-parameter simultaneous detection capability, so researchers have concentrated their efforts on online multi-parameter measurement research. The key to single-point multi-parameter measurement is to obt...

AI Technical Summary

Problems solved by technology

It is difficult for some dual-parameter sensors proposed so far to fully identify the two measurands, that is, the similar responses of the dual-parameters to the sensors are still difficult to distinguish intuitively.

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