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Target fiber grating rheometer

A fiber grating, tachometer technology, applied in fluid velocity measurement, velocity/acceleration/impact measurement, instruments, etc., can solve the problems of low accuracy, poor waterproof performance, high cost, improve measurement accuracy, achieve temperature compensation, waterproof good performance

Inactive Publication Date: 2011-03-30
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional electrical flow rate sensors have low precision, large volume, poor waterproof performance, and are susceptible to electromagnetic interference, and most of them are limited to the flow rate measurement inside the pipeline, and cannot be used for online monitoring of the runoff flow rate in small cracks and slopes.
However, although the measurement accuracy of the flow velocity measuring instrument using ultrasonic wave and the flow velocity meter using the acoustic Doppler effect is high, its cost is high and it is susceptible to electromagnetic wave interference, which seriously limits its wide application in engineering.

Method used

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] figure 1 , figure 2 Among them, one end of the housing 1 is connected to a detachable tee 4 with a variable inner diameter, and the other end of the housing 1 is provided with an end cover 3 with a cross-shaped hole and a screw hole, and a fixed metal sheet 9 is arranged in the cross-shaped hole, and the fixed metal A cantilever beam 7 of equal strength is connected to the sheet 9 . The measurement grating 8 of the double fiber grating is evenly pasted on both sides of the cantilever beam 7 by adhesive, and the other end of the cantilever beam 7 is directly fixedly connected with the circular metal target piece 5, and the metal target piece 5 is placed in the tee 4, and the feeling The force corresponding to the flow velocity is transmitted to the cantilever beam 7 with equal strength. The cantilever beam 7 is covered with a tapered soft rubb...

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Abstract

The invention relates to a target fiber grating rheometer, which has small measurement volume, high precision, good waterproof property and electromagnetic interference resistance, and can perform real-time monitor in different environments such as pipeline, crack and the like. The target fiber grating rheometer comprises a casing, one end of which is connected with a measurement joint and the other end of which is provided with an end cover; the end cover is equipped with a fixed metal sheet which is connected with a cantilever beam, the cantilever beam is provided with a measurement grating, the measurement grating is connected with fibers passing through the end cover; the end of the cantilever beam is provided with a metal target sheet arranged inside the measurement joint, and the cantilever beam is provided with a sealing device.

Description

technical field [0001] The invention relates to an optical fiber grating flow velocity sensor with temperature compensation function, in particular to a target type optical fiber grating flow velocity meter capable of measuring flow velocity in pipes or gaps with variable inner diameter or width. Background technique [0002] Fiber Bragg Grating is an optical passive device sensitive to temperature and strain. It not only inherits many advantages of ordinary fiber optic sensors: such as high sensitivity, fast response, wide dynamic range, light weight, compact structure, flexible use, and corrosion resistance. , high temperature resistance, free from electromagnetic interference, and can work in harsh, explosive and high-risk environments such as mines, oil fields and oil tanks. At the same time, fiber grating sensors have some features that are obviously superior to ordinary fiber optic sensors: such as large bandwidth range and small additional loss; the sensor head has si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/04
Inventor 隋青美王正方王静李术才张庆松张宵贾磊
Owner SHANDONG UNIV
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