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Optical fiber pressure sensing measurement method and device

A technology for sensing measurement and pressure, which is applied in the direction of measuring devices, fluid pressure measurement using optical methods, and rapid measurement changes, and can solve problems such as high cost, complex structure, and low sensitivity

Inactive Publication Date: 2015-03-25
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The functional type has both "transmission" and "sensing" functions, but requires special optical fibers and advanced detection technology, so the cost is high and the structure is complicated
The non-functional type is mostly used in occasions with low sensitivity because the optical fiber is only used to transmit signals and has low sensitivity.

Method used

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  • Optical fiber pressure sensing measurement method and device
  • Optical fiber pressure sensing measurement method and device
  • Optical fiber pressure sensing measurement method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Relevant description of the present invention:

[0068] 1. The optical signal device of the measuring path includes a single-mode optical fiber and the first Faraday rotating mirror,

[0069] Among them, the single-mode optical fiber is used to transmit the optical signal of the measurement path to the first Faraday rotating mirror; at the same time, output the laser signal reflected back by the first Faraday rotating mirror;

[0070] The first Faraday rotating mirror: it is used to receive the same polarization state of the measurement path and the reference path, to ensure the autocorrelation of the two paths of signals, and to reflect the optical signal of the measurement path to the coupler through a single-mode fiber.

[0071] 2. The reference path optical signal device is the second Faraday rotating mirror, which is used to make the measurement path and the reference path have the same polarization state, ensure the autocorrelation of the two paths of signals, and...

Embodiment 1

[0080] Embodiment one: 1. A kind of optical fiber pressure sensing measurement method comprises:

[0081] Step 1: Pulse laser output laser beam;

[0082] Step 2: The output beam of the laser is divided into two optical signals after passing through the filter, circulator and coupler, one of which is the measurement optical signal, and the other information is the reference optical signal;

[0083] Step 3: The optical signal of the measurement path is transmitted by the first Faraday rotating mirror after passing through the single-mode fiber; at the same time, the optical signal of the reference path is reflected by the second Faraday rotating mirror, and the optical signal of the measuring path and the optical signal of the reference path are converted into a composite signal through a coupler ;

[0084] Step 4: When the single-mode optical fiber is in the zero-pressure state, the composite signal is output to the autocorrelator through the circulator, and the relative delay t...

Embodiment 2

[0099] Embodiment 2: A kind of optical fiber pressure sensing measuring device comprises:

[0100] Pulse laser: used to output laser beam;

[0101] Filter: used to ensure that the measurement path and the reference path have the same spectral components, thereby generating an autocorrelation signal;

[0102] Circulator: used to ensure the correct direction of the optical path;

[0103] Coupler: It is used to divide the laser beam input by the pulse laser into 2 paths and receive 2 paths of reflected signals, so that the light intensity of the two paths can be 1:1 as much as possible when combining the beams after reflection;

[0104] Single-mode optical fiber: used to feel the external pressure, the external pressure causes its refractive index to change, resulting in a change in the delay of the two signals, which is reflected in the change in the distance between the autocorrelation peaks;

[0105] Faraday rotating mirror: used to make the measurement path and the referenc...

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Abstract

The invention relates to the technical field of high-precision optical fiber pressure sensing, in particular to an optical fiber pressure sensing measurement method and device. The optical fiber pressure sensing measurement method and device solve the technical problems in the prior art and are simple in structure and high in measurement accuracy. When outside pressure is applied to an optical fiber serving as a detector, the optical path for optical pulses to transmit in the optical fiber changes, the change of the optical path is measured in real time through an autocorrelator, and therefore the pressure applied to the optical fiber can be obtained. According to the method and device, laser beams are output through a pulse laser; the beams output from the laser are divided into two paths of optical signals after passing through a filter, a circulator and a coupler, one path of optical signals are measurement path optical signals, the other path of optical signals are reference path optical signals, and an outside pressure value is obtained according to the formula in the specification by measuring whether outside pressure exists or not and measuring the interval delta T and T of the autocorrelator.

Description

technical field [0001] The invention relates to the technical field of high-precision optical fiber pressure sensing, in particular to an optical fiber pressure sensing measurement method and device. Background technique [0002] Optical fiber sensing technology began to enter the research field in the 1970s, and developed rapidly along with the development of optical fiber and optical fiber communication technology. It uses light as the carrier and optical fiber as the medium to perceive and transmit external signals. sense technology. Because fiber optic sensors have incomparable advantages of traditional sensors, such as good stability, high reliability, small size, light weight, fast response, high sensitivity, wide dynamic range, free from electromagnetic field interference, simple structure and low cost, etc., It has become a technology that has developed rapidly in recent decades. [0003] Since G.B. Hocker proposed the application of single-mode optical fiber in pr...

Claims

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Application Information

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IPC IPC(8): G01L1/24G01L11/02G01L23/00
Inventor 王竞陶世兴李建中温伟峰张卓宁彭其先陈光华
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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