Mach-Zehnder interference bending sensor

Abstract

The invention relates to the technical field of sensors, particularly to a Mach-Zehnder interference bending sensor. The Mach-Zehnder interference bending sensor includes a signal source module, an interference sensing module and a spectrum display module, one end of the interference sensing module is connected to the signal source module, the other end of the interference sensing module is connected to the spectrum display module, the signal source module comprises a semiconductor laser amplifier unit and a drive circuit unit, the interference sensing module includes a single-mode fiber and athree-core fiber, and fiber cores in the single-mode fiber and the three-core fiber are connected together in a staggered welding mode through a fiber fusion splicer. By adoption of such structural setting, the Mach-Zehnder interference bending sensor can realize measurement of a high-sensitivity bending direction when used for measuring target bending, since a transmitted optical signal is not affected by electromagnetic interference, the stability of the sensor is better than that of a sensor of the same kind which performs monitoring by electric signals at present, and due to adoption of afiber structure, the sensor has a small size and long measuring distance, and can monitor multiple parts of a target at the same time.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a Mach-Zehnder interference bending sensor. Background technique [0002] Due to its outstanding advantages such as small size, compact structure, and low loss, optical fiber interference sensors have important application values ​​in the fields of robotics, structural monitoring, aerospace, and automotive industry aerospace. Many types of sensors have been developed by researchers, such as tilted fiber Bragg gratings (FBGs), long-period fiber Bragg gratings (LPFGs), gratings written in special fibers, and fiber-optic interferometers. These structures have many advantages, enabling precise measurement of the bending direction. [0003] Currently, the conventionally used bending sensors are implemented based on the application of fiber gratings. Specifically, some researchers have found that it is possible to measure the direction of bending by using lasers to write conventional...

AI Technical Summary

Problems solved by technology

Specifically, some researchers have found that it is possible to measure the direction of bending by using lasers to write conventional fiber gratings or long-period fiber gratings in specially designed fibers. However, the direction of bending based on fiber gratings and long-period gratings The sensor has a complex manufacturing process, resulting in high manufacturing costs, and in addition, bending sensors based on fiber gratings and long-period gratings have low sensitivity

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