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Optical Fiber Interferometric Pressure Sensor Based on 3×3 Coupler

A technology of pressure sensor and optical fiber interference, which is applied in the direction of measurement, instrumentation, and force measurement by measuring the change in optical properties of the material when it is stressed, can solve the problems of reduced practicability, small range, and difficult processing. Achieve the effect of easy direction judgment, easy measurement range and convenient demodulation

Inactive Publication Date: 2019-05-24
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty in the manufacture and processing of the FA-P cavity, and the small range has certain limitations, and it needs to be operated with a spectrum analyzer, which greatly increases the cost and reduces the practicability in engineering applications.

Method used

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  • Optical Fiber Interferometric Pressure Sensor Based on 3×3 Coupler
  • Optical Fiber Interferometric Pressure Sensor Based on 3×3 Coupler
  • Optical Fiber Interferometric Pressure Sensor Based on 3×3 Coupler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the system block diagram of the optical fiber interference type pressure sensor based on 3 by 3 couplers. The invention includes semiconductor lasers, isolators, 3*3 couplers arranged in parallel, pressure sensing arms, reference fiber arms, photodetectors, and host computer demodulation systems. The light emitted by the semiconductor laser passes through the isolator and enters the parallel arrangement of 3*3 couplers and is divided into two beams of light. One beam returns after passing through the pressure sensing arm, and the other beam returns after passing through the reference fiber arm. The returned light is in the Interference occurs in the 3*3 couplers arranged in parallel, and it is divided into three beams, two of which enter the photodetector and then demodulate the signal by the demodulation system of the host computer to realize the measurement of the pressure signal.

Embodiment 2

[0023] Such as figure 2 As shown, the structure diagram of the optical fiber interference type pressure sensor based on the 3 by 3 coupler. The sensor structure includes a semiconductor laser 1, an isolator 2, a parallel arrangement of 3*3 couplers 3, light guide fibers 4 and 5, a pressure sensitive probe 6, a reference fiber ring 7, Faraday rotation mirrors 8 and 9, and a photodetector 10 , 11, host computer demodulation system 12. The semiconductor narrow-bandwidth laser 1 is connected to the isolator 2, and the output terminal of the isolator 2 is connected to the 3*3 coupler 3 arranged in parallel, and the two output terminals of the 3*3 coupler 3 arranged in parallel are divided into A and B, and A The road is connected with the pressure-sensitive probe 6 through the first light-guiding fiber 4, and the B-way is connected with the reference fiber ring 7 through the second light-guiding fiber 5, and the output ends of the pressure-sensitive probe 6 and the reference fibe...

Embodiment 3

[0026] Such as image 3 , Figure 4 Shown is the structural diagram and cross-sectional diagram of the pressure sensitive probe of the optical fiber interference type pressure sensor based on the 3 by 3 coupler. Depend on image 3 with Figure 4It can be seen that when the sensitive probe load-bearing body 14 is subjected to external pressure, it will drive the second coaxial cylinder 18 to move up and down. Since the first coaxial cylinder 15 is connected with the pressure sensitive probe housing 13, when the second coaxial cylinder When the body 18 moves up and down, it will cause the length of the sensing fiber to expand and contract, so that the relative length between the reference arm and the signal arm in the Michelson interference system changes, which in turn causes the phase of the transmitted light in the fiber to change, and finally through the optical Demodulation of strong signals enables pressure measurements. In the sensitive probe, the sensing fiber 16 is ...

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Abstract

The invention discloses a fiber interference type pressure sensor based on a 3*3 coupler. The fiber interference type pressure sensor based on 3*3 couplers is formed by a semiconductor laser, an isolator, a 3*3 coupler arranged in parallel, light guide fibers, a pressure sensitive probe, a reference fiber circle, Faraday rotating mirrors, photoelectric detectors and a host computer demodulation system, wherein the pressure sensitive probe is the key part for pressure sensing; the main principle is to convert the change of external pressure into the change of fiber length and other physical properties so as to cause the change of the length between a reference arm and a signal arm in a whole Michelson interference structure and the change of a phase signal in the sensing fiber; by means of interference, the change of the phase signal is converted into the change of a light intensity signal; and by means of demodulation of the light intensity signal detected by the photoelectric detectors, measurement of the change of the phase signal can be realized, so that the change of a pressure signal can be inverted. The fiber interference type pressure sensor based on a 3*3 coupler can realize measurement of the pressure signal and is safe in the essence, and has the advantages of being high in sensitivity, being simple in structure, being convenient for debugging, and being corrosion resisting and anti-interference.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a Michelson interference pressure sensor based on a 3*3 coupler. . Background technique [0002] As a typical sensor, the pressure sensor involves various fields related to the national economy and the people's livelihood. Pressure sensors usually use sensitive components to environmental variables such as physical effects, chemical effects, etc. to make a variety of pressure sensors, and the range of pressure measurement gradually increases. With the integration, intelligence, miniaturization, serialization and standardization of sensors With the development of modern measurement and control technology, computer technology, and the improvement of data signal processing technology, the demand for high-precision and high-sensitivity pressure sensors is also increasing. With the development of new technologies, fiber optic pressure sensors have become a new research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/24
CPCG01L1/242
Inventor 郎金鹏陈建冬常天英于淼崔洪亮高文智王旭刘野
Owner JILIN UNIV