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

A polarization-maintaining optical fiber and micro-acceleration technology, which is applied in polarized optical fiber, acceleration measurement using inertial force, cladding optical fiber, etc., can solve problems such as insufficient integration, high product price, and slow speed, and achieve stability. The method is simple and easy to implement, and is conducive to the effect of miniaturization

Inactive Publication Date: 2010-09-15
HARBIN ENG UNIV
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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 pric

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

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Embodiment Construction

[0021] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0022] figure 2 For the present invention is based on the cross-sectional view of the fusion-embedded dual-core polarization-maintaining fiber; the two cores 8 have the same polarization axis direction, the center of the fiber is an air hole 10, and the two cores 8 are symmetrically embedded in the inner wall of the cladding 9, each Each core 8 is partially exposed in the air hole 10 in the cladding.

[0023] figure 1 It is a structural diagram of the micro-acceleration sensor system based on the fusion-embedded dual-core polarization-maintaining optical fiber of the present invention. After the light emitted by the light source 1 passes through the circulator 2, it enters the single-core polarization-maintaining single-mode optical fiber 3 from the first output port of the circulator. , and then use the polarization-maintaining fiber coupler 4 to couple to the...

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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...

Claims

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Application Information

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IPC IPC(8): G01P15/03G02B6/024G02B6/26
Inventor 苑立波关春颖杨军
Owner HARBIN ENG UNIV
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