Optical fiber accelerometer

An accelerometer and acceleration technology, which is applied in the direction of using inertial force for acceleration measurement, etc., can solve the problems of large polarization influence and difficulty in implementation, and achieve the effects of good linearity, good stability and low noise.

Inactive Publication Date: 2012-10-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For interferometric fiber optic accelerometers that use phase modulation, at present, Mach-Zehnder interferometer and Michelson interferometer structures are mostly used. These two fiber op

Method used

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  • Optical fiber accelerometer
  • Optical fiber accelerometer
  • Optical fiber accelerometer

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1:

[0030] like figure 1 As shown, a fiber optic accelerometer includes a light source, a splitter, a polarizer, a phase modulator, a delay fiber, a Faraday rotator, a coupler, an acceleration sensitive head, and a photodetector.

[0031] Among them, the photodetector, light source, splitter, polarizer, phase modulator, delay fiber, and signal processing circuit form the control unit, and the coupler and acceleration sensitive head form the sensing unit.

[0032] The pigtail of the light source is fused with one input fiber of the splitter, the pigtail of the photodetector is fused with the other input fiber of the splitter; the output fiber of the splitter is fused with the polarizer, The polarization-maintaining fiber at the output end of the polarizer and the polarization-maintaining fiber at the input end of the phase modulator are fused at 45°, the output end fiber of the phase modulator is fused with the input end fiber of the delay fiber, and the output...

Example Embodiment

[0033] Example 2:

[0034] like figure 2As shown, a fiber optic accelerometer includes a light source, a splitter, an integrated phase modulator, a polarization beam splitter / combiner, a delay fiber, a Faraday rotator, a coupler, an acceleration sensitive head, and a photodetector.

[0035] Among them, the photodetector, light source, splitter, integrated phase modulator, delay fiber, and signal processing circuit form the control unit, and the coupler and acceleration sensitive head form the sensing unit.

[0036] The pigtail of the light source is fused with the optical fiber at one input end of the splitter, the pigtail of the photodetector is fused with the optical fiber at the other input end of the splitter; the output end of the splitter is fused with the integrated phase modulator, The polarization-maintaining fiber at one output end of the integrated phase modulator is fused with the polarization-maintaining fiber at one input end of the polarization splitter / combin...

Example Embodiment

[0037] Example 3:

[0038] like image 3 As shown, a fiber optic accelerometer includes a light source, a splitter, a polarizer, a phase modulator, a delay fiber, a Faraday rotator, an acceleration sensitive head, a mirror, and a photodetector.

[0039] Among them, the photodetector, light source, splitter, polarizer, phase modulator, delay fiber, and signal processing circuit form the control unit, and the coupler, acceleration sensitive head, and reflector form the sensing unit.

[0040] The pigtail of the light source is fused with one input fiber of the splitter, the pigtail of the photodetector is fused with the other input fiber of the splitter; the output fiber of the splitter is fused with the polarizer, The polarization-maintaining fiber at the output end of the polarizer and the polarization-maintaining fiber at the input end of the phase modulator are fused at 45°, the output end fiber of the phase modulator is fused with the input end fiber of the delay fiber, and...

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Abstract

The invention discloses an optical fiber accelerometer, which consists of a control unit, a Faraday optical rotation device and a sensing unit, wherein the control unit generates two beams of polarized light in an orthographic mode for the sensing unit and carries out non-reciprocity phase modulation on the two beams of polarized light by a phase modulator; the Faraday optical rotation device is positioned between the control unit and the sensing unit and has a function that the two beams of polarized light in an orthographic mode, which are returned from the sensing unit, realize mode interchange so as to enable the two beams of orthographic polarized light generated by the control unit to generate reciprocity on a light path in front of the Faraday optical rotation device; a sensing optical fiber in the sensing unit is evenly wound on an elastomer; the two beams of orthographic polarized light generated by the control unit are transmitted in the sensing optical fiber; the sensitive to-be-measured acceleration of a mass block is transferred to the elastomer; the elastomer generates corresponding deformation so as to generate a phase difference in two beams of polarized light of the sensing optical fiber; and the phase difference is detected to obtain the to-be-measured acceleration.

Description

technical field [0001] The invention relates to an optical fiber accelerometer and belongs to the technical field of optical fiber sensing. Background technique [0002] There are various methods of measuring acceleration, including mechanical, electromagnetic, radiation, etc., and there are about 20 kinds of measurement methods that have been reported. Corresponding to each measurement method, different forms of accelerometers can be made. With the continuous development of science and technology, the technology to improve the accuracy of accelerometers is also constantly improving. High-precision accelerometers are developing rapidly. Pendulum accelerometers; liquid floating pendulum accelerometers, flexible accelerometers, piezoelectric accelerometers, electromagnetic accelerometers, etc., which were developed in the mid-1960s, and later electrostatic accelerometers and laser accelerometers; after the 1970s, In addition to the continuous improvement of the above-mention...

Claims

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Application Information

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IPC IPC(8): G01P15/03
Inventor 王夏霄李立京于佳邬战军李传生冯秀娟李彦张晞
Owner BEIHANG UNIV
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