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Distributed fluid pressure and temperature simultaneous measurementmethod based on optical fiber brillouin scattering

A technology of Brillouin scattering and fluid pressure, applied in fluid pressure measurement using optical methods, thermometers with physical/chemical changes, thermometers, etc., to achieve high accuracy and strong real-time measurement

Inactive Publication Date: 2015-03-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, regarding the influence of fiber deformation on the Brillouin frequency shift, these previous studies basically revolved around the change of fiber length or the effect of axial strain on the Brillouin frequency shift, while the overall deformation of the fiber under fluid pressure affects the Brillouin frequency shift. Research on the influence of deep frequency shift has not yet been published

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  • Distributed fluid pressure and temperature simultaneous measurementmethod based on optical fiber brillouin scattering
  • Distributed fluid pressure and temperature simultaneous measurementmethod based on optical fiber brillouin scattering
  • Distributed fluid pressure and temperature simultaneous measurementmethod based on optical fiber brillouin scattering

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specific Embodiment approach 1

[0028] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, a distributed fluid pressure and temperature simultaneous measurement device based on optical fiber Brillouin scattering, which includes a Brillouin optical time domain detection and analysis module 1, N integrated two-cavity structures 2, transmission optical fibers 3, N A pressure sensing optical fiber 211 and N temperature sensing optical fibers 221;

[0029] Each integral two-cavity structure 2 is composed of a pressure sensor cavity 21 and a temperature sensor cavity 22, and a through hole is arranged between the cavity of the pressure sensor cavity 21 and the external space, and the pressure sensor cavity 21 and the external space The temperature sensor cavity 22 is provided with wire holes;

[0030] N pressure sensing optical fibers 211 are respectively arranged in N pressure sensor cavities 21, and N temperature sensing optical fibers 221 are respectively arranged in N tempe...

specific Embodiment approach 2

[0034] Specific embodiment 2. This specific embodiment is a further limitation of the distributed fluid pressure and temperature simultaneous measurement device based on optical fiber Brillouin scattering described in specific embodiment 1. The Brillouin optical time domain detection and analysis module 1 adopts a distributed Li Yuan optical time domain reflectometer (BOTDR) implementation.

specific Embodiment approach 3

[0035] Specific Embodiment 3. This specific embodiment is a further limitation of the distributed fluid pressure and temperature simultaneous measurement device based on optical fiber Brillouin scattering described in specific embodiment 1 or 2. Each pressure sensing optical fiber 211 and each temperature The sensing optical fiber 221 is a coiled optical fiber.

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Abstract

The invention discloses a distributed fluid pressure and temperature simultaneous measurement device and method based on optical fiber brillouin scattering, which relates to a fluid pressure and temperature simultaneous measurement device and method, and aims to realize simultaneous measurement of the multi-point distributed pressure and temperature of high-pressure fluid. A pressure sensing optical fiber is loosely located in a non-sealed pressure sensor cavity; a temperature sensor is loosely located in a sealed temperature sensor cavity; and a temperature sensing optical fiber, the pressure sensing optical fiber and a transmission optical fiber are located on the same continuous optical path. In the invention, the fluid pressure and temperature information of an optical fiber sensor at the corresponding point are obtained by detecting the optical fiber brillouin frequency shift according to the corresponding relation between the optical fiber brillouin frequency shift and the fluid pressure and temperature of the optical fiber. The device disclosed by the invention has a simple structure, can realize continuous arrangement of sensors at any multiple points, and is suitable for performing simultaneous measurement of the pressure and temperature of high-pressure fluid.

Description

technical field [0001] The invention relates to a simultaneous measurement device and method for fluid pressure and temperature. Background technique [0002] Optical fiber sensing detection and measurement technology is usually based on the fact that some characteristics of the light propagating in the optical fiber change with changes in external physical quantities. These physical quantities include temperature, pressure, magnetic field, electric field, and other mechanical motions, while changes in the properties of the propagated light include light intensity, phase, polarization state, and frequency. [0003] Optical fiber measurement and sensing technology is more and more widely used due to its unique advantages such as explosion-proof, anti-electromagnetic interference and easy realization of distributed layout. At present, the practical optical fiber sensors mainly include fiber grating sensors, Brillouin sensors, Raman sensors and so on. Fiber Bragg Grating has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/02G01K11/32G01L11/02G01K11/322
Inventor 张广玉顾海栋董惠娟何俊徐宁
Owner HARBIN INST OF TECH