Micro-accelerometer sensor based on embedded core type twin-core polarization maintaining fiber

Abstract

The invention provides a micro-accelerometer sensor based on embedded core twin-core polarization maintaining fiber. The micro-accelerometer sensor is characterized in that light emitted by a light source enters single-core polarization maintaining single-mode fiber from a first output port of a circulator after passing through the circulator; the light is then coupled and input to the twin-core polarization maintaining fiber through a polarization maintaining fiber coupler; and finally the light enters a speed sensing probe composed of the twin-core polarization maintaining fiber and is reflected by a reflection device of the speed sensing probe to return according to original routes, emerges through a second output port of the circulator after passing through the polarization maintaining fiber coupler and is received and detected by a detector. In the invention, a twin-core Michelson interferometer structure is adopted to realize acceleration measurement, which is favorable to miniaturization and integration of the sensor; the polarization maintaining fiber is adopted to form a Michelson interferometer, which can solve the stability problem caused by random variation of a polarization state of the traditional accelerometer sensor; and the method for manufacturing the fiber coupler is simple and feasible and has high yield.

Description

technical field [0001] The invention relates to an optical fiber acceleration sensor, in particular to a micro acceleration sensor. Background technique [0002] The measurement of acceleration has a wide range of applications in many fields. With the continuous expansion of the scope of use, the sensor is required to be smaller in size, with higher measurement accuracy and reliability, and to develop in the direction of intelligence. Due to the rapid development of science and technology, the requirements for the accuracy, stability and miniaturization of the sensor are getting higher and higher, and the phase modulation optical fiber sensor is one of the main objects of current research and development. The phase modulation sensor is a physical perturbation that interacts with one or two interference arms of the fiber optic interferometer to modulate the phase of the light wave in the fiber, and the output of the interferometer is a light intensity signal that has a certa...

AI Technical Summary

Problems solved by technology

Due to manual operation, the operator has high technical requirements, slow speed, low output, low yield, and poor consistency of device performance, so the product price is high

Hu Yongming and others proposed an accelerometer using polarization-maintaining fiber (China Laser, 2005, 32(10): 1382), but its integration level is not enough

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