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High Sensitivity Distributed Hydrostatic Pressure Sensing Method

A technology with high sensitivity and sensing method, applied in the field of hydrostatic pressure sensor, can solve the problem of low accuracy of hydrostatic pressure sensor, and achieve the effect of high spatial resolution, high sensing sensitivity and high sensitivity

Active Publication Date: 2018-09-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low precision of the existing hydrostatic pressure sensor, provide a highly sensitive distributed hydrostatic pressure sensor, and provide a method for measuring the pressure of the fluid environment by using the sensor

Method used

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  • High Sensitivity Distributed Hydrostatic Pressure Sensing Method
  • High Sensitivity Distributed Hydrostatic Pressure Sensing Method

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Experimental program
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Effect test

specific Embodiment approach 1

[0043] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the high-sensitivity distributed hydrostatic pressure sensor described in this embodiment includes a first tunable laser module 1, a second tunable laser module 2, a sensing fiber 3, a polarization beam splitter 4, Photodetector 5, fiber optic circulator 6, data acquisition card 7 and third tunable laser module 10;

[0044] The output frequency of the first tunable laser module 1 is ν 0 A continuous laser beam, the laser beam is a single polarization continuous laser beam whose polarization state is consistent with the x-axis of the sensing fiber 3, and the laser beam is injected into the +x axis of the sensing fiber 3;

[0045] The output frequency of the second tunable laser module 2 is ν 1 CW laser, the laser beam is a single polarization CW laser whose polarization state is consistent with the x-axis of the sensing fiber 3, and the frequency ν 0 with ν 1 There is a fib...

specific Embodiment approach 2

[0053] Specific implementation mode two: the following combination figure 2 Describe this embodiment. Compared with Embodiment 1, this embodiment adds a signal generator 8 and an electro-optic modulator 9, and the frequency emitted by the third tunable laser 10 is ν 2 continuous laser light rather than pulsed light.

[0054] See the specific structure figure 2 , the high-sensitivity distributed hydrostatic pressure sensor, which includes a first tunable laser module 1, a second tunable laser module 2, a sensing fiber 3, a polarization beam splitter 4, a photodetector 5, an optical fiber ring 6, data acquisition card 7, signal generator 8, electro-optic modulator 9 and the third tunable laser module 10;

[0055] The output frequency of the first tunable laser module 1 is ν 0 A continuous laser beam, the laser beam is a single polarization continuous laser beam whose polarization state is consistent with the x-axis of the sensing fiber 3, and the laser beam is injected into...

specific Embodiment approach 3

[0061] Specific implementation mode three: This implementation mode further explains the first or second implementation mode, the first tunable laser module 1 and the second tunable laser module 2 are replaced by a laser, and the laser uses microwave modulation to form two beams Frequency ν 0 with ν 1 The laser, the frequency difference between the two laser beams is a fiber Brillouin frequency shift Δν B .

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Abstract

A high-sensitivity distribution type hydrostatic pressure sensor and a method of measuring fluid environment pressure by using the high-sensitivity distribution type hydrostatic pressure sensor belong to the optical field. The problem of low precision of a conventional hydrostatic pressure sensor is solved. V0 laser and V1 laser, with one fiber Brillouin frequency shift difference, relatively enter into x-axis of sensing fiber and conduct Brillouin scattering. The pulsed light of V2, with one fiber birefringence frequency shift with the V0 laser or the V1 laser is injected into the y-axis of the sensing fiber, and is output after being reflected by a Brillouin dynamic raster. The fiber birefringence change is obtained by measuring the change of fiber birefringence frequency shift when the Brillouin dynamic raster is excited and detected in the sensing fiber, so that the position and magnitude of extraneous fluid environment static pressure applied on fiber are demodulated. The extraneous fluid environment static pressure change information of sensing fiber is obtained by measuring the birefringence frequency shift change of the sensing fiber.

Description

technical field [0001] The invention belongs to the field of optics, and relates to a hydrostatic pressure sensor based on Brillouin dynamic grating technology and a system test and use method thereof. Background technique [0002] Under the background of the rapid improvement of the industrial level and the continuous development of the production mode, people put forward higher and higher requirements for the health monitoring of the production environment. Among them, the pressure monitoring in the fluid environment is one of the most concerned research directions. One, therefore, the research on the highly sensitive distributed hydrostatic pressure sensor has high research value and practical value. Compared with other traditional hydrostatic pressure sensors, fiber optic hydrostatic pressure sensors have many unique advantages: First, the use of optical fiber sensing technology can effectively prevent electromagnetic interference, and can obtain more accurate measuremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L11/02
Inventor 董永康张居旺滕雷吕志伟
Owner HARBIN INST OF TECH
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