A Miniature Optical Fiber Extrinsic Michelson Acceleration Sensor with Common Optical Path Structure

Abstract

The invention belongs to the technical field of optical fibers, and specifically relates to a common-path miniature fiber extrinsic Michelson acceleration sensor. The acceleration sensor is composed of an acceleration sensing device, a sensor supporting structure, a sensor substrate, a first anti-reflection film, a second anti-reflection film, a glass casing pipe, a fiber collimating lens, a fibersleeve and a single-mode fiber. The acceleration sensing device is fixed on the sensor supporting structure, and the sensor supporting structure is fixed on the upper surface of the sensor substrate.The sensor supporting structure and the sensor substrate have the same outer diameter, and the central regions of the interiors of the sensor supporting structure and the sensor substrate are each provided with a circular through hole. The acceleration sensor employs a common-path structure, and can avoid the sensor signal fading caused by the polarization fading under the condition that no Faraday polariscope is employed, thereby guaranteeing the stability of a detection result. The acceleration sensor effectively reduces the processing cost and size.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a miniature optical fiber extrinsic Michelson acceleration sensor with a common optical path structure. Background technique [0002] Acceleration measurement has a wide range of applications, including missile guidance in aerospace, aircraft navigation, and state control of artificial satellites; pre-brake systems, traction systems, driving systems, and safety systems in the automotive industry. Its sensing mechanism is to use the mass structure supported by the elastic device to sense the acceleration, and to detect the change of its own space state caused by the mass block under the action of acceleration, and at the same time cause the change of the space state of the elastic device and its own material properties. By detecting these The change realizes the measurement of acceleration. [0003] Due to the advantages of small size, light weight, high...

AI Technical Summary

Problems solved by technology

However, its sensing probe is mainly composed of discrete components, and its interior contains Faraday rotator and other devices, resulting in the disadvantages of complex processing, large volume, high cost, difficult sensitivity control and poor repeatability.

[0005] To sum up, there are problems in the prior art such as complicated processing, large volume, high cost, difficult sensitivity control, poor repeatability, and difficult installation.

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