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Optical fiber type flow monitoring device

A flow monitoring, fiber-optic technology, applied in the field of flow meters, can solve the problems of low accuracy of magnetic field parameters, limit the use range of flowmeters, and accuracy interference, etc., and achieve the advantages of easy multiplexing and networking, good use prospects, and overall cost reduction Effect

Inactive Publication Date: 2012-03-21
XIAN JINHE OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the digital flowmeter mainly obtains the height of the magnetic float through the Hall sensor element located outside the cone tube, and then displays the flow rate of the fluid through circuit processing. Due to the unevenness of the magnetic field parameters, the accuracy of this type of flowmeter is not high. , its accuracy is subject to environmental electromagnetic interference
And this type of flowmeter can only be placed vertically, which limits the scope of use of this type of flowmeter

Method used

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  • Optical fiber type flow monitoring device
  • Optical fiber type flow monitoring device
  • Optical fiber type flow monitoring device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 , figure 2 Shown, in the present invention, comprise float 9, housing 10, by having front snap ring 2 and rear snap ring 3 on the inner wall of housing 10, be fixed with front retaining ring 11 and rear retaining ring 12 respectively, and in two retaining rings There is a guide rod 13 between them, the float 9, the auxiliary spring 15 and the flat washer 18 are slidingly matched with the guide rod 13, and one end of the curved housing 4 is fixed on the back ring 12, and the curved housing 4 passes through the flat washer 18 and the auxiliary The springs 15 are connected together, and one end of the auxiliary spring 15 is fixed with a float 9. There is a sealed optical fiber interface 20 on the housing 10, which is the passage for the optical fiber to enter and exit. The sealing material can be epoxy resin and other materials. In the curved housing 4 There are a plurality of A-side deformed teeth 4-1 and a plurality of B-side deformed teeth 4-2 arrange...

Embodiment 2

[0033] Such as image 3 As shown, in this embodiment, the difference from Embodiment 1 is that there is no auxiliary spring 15 inside the housing 10 , and the float 9 is directly fixed at one end of the curved housing 4 . In this embodiment, the structures, connections and working principles of other parts are the same as those in Embodiment 1.

Embodiment 3

[0035] Such as Figure 4 As shown, in this embodiment, the difference from Embodiment 1 is that there are two signal optical fibers 6 in the curved housing 4 connected in series through the extended optical fiber 1 to form a quasi-distributed optical fiber sensing system. A light reflection device 46, such as a fiber Bragg grating, is arranged on the extended optical fiber 1 between the housings 4, and of course the preferred way is to select a fiber Bragg grating with low reflectivity. At this time, the preference of the test unit 5 is to use an optical time domain reflectometer (OTDR). The change of any flowmeter can be obtained by the test curve of the optical time domain reflectometer. Further, the light reflection height of the light reflection device 46 can be measured. The change of the flow meter in front of the light reflection device 46 is realized, thereby further improving the test accuracy. In this embodiment, the structures, connections and working principles of...

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Abstract

The invention discloses an optical fiber type flow monitoring device based on optical fiber bend loss change. Mainly, a curved shell (4) is connected with a floater (9) in a shell (10), a plurality of transformable teeth are arranged on the two opposite sides in the curved shell (4), and a signal fiber (6) is clamped between the transformable teeth on the two sides. The floater (9) is driven by fluid to move and change the length of the curved shell (4), as a result, the positions of the transformable teeth on the two sides in the curved shell (4) are changed and thereby the curvature of the signal fiber (6) clamped between the transformable teeth on the two sides is changed, so that the microbend loss of the signal fiber (6) is changed, a testing unit (5) detects and transmits the microbend loss change to a processing unit (7), and the processing unit (7) works out the flow of the fluid. The precision of the device is high, the cost is low, and the device can remotely transmit data, is easy to multiplex and network, and has a broad application prospect.

Description

technical field [0001] The invention relates to a flow meter, more precisely, to a device for detecting flow by using the change of optical fiber bending loss. Background technique [0002] The existing float flow meter is composed of a vertical tapered tube enlarged from bottom to top and a float that moves up and down along the axis of the tapered tube. When the measured fluid passes through the annular gap formed by the tapered tube and the float from bottom to top, the pressure difference between the upper and lower parts of the float will give the float a rising force. When the lifting force on the float is greater than the weight of the float immersed in the fluid, the float will rise and the float will The area of ​​the annulus between the conical tube and the conical tube increases accordingly, the flow rate of the fluid in the annulus decreases, the pressure difference between the upper and lower parts of the float decreases, and the lifting force acting on the floa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/52
Inventor 杜兵
Owner XIAN JINHE OPTICAL TECH