Pressure measuring device and method of fiber difference interference

A technology of differential interference and measuring device, which is applied to the fluid pressure measurement and measuring device using optical methods, and the use of optical devices to transmit sensing components, etc. The effect of the signal-to-noise ratio

Inactive Publication Date: 2017-02-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The technical problem of the present invention is to overcome the shortcomings of existing pressure measurement methods, and provide a pressure measurement device and method for optical fiber differential interference, which can realize high-temperature and high-corrosion pressure measurement, and has anti-electromagnetic interference and anti-radiation, etc. Advantage

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  • Pressure measuring device and method of fiber difference interference
  • Pressure measuring device and method of fiber difference interference
  • Pressure measuring device and method of fiber difference interference

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] First set the propagation direction of the fiber laser light source output beam as the z-axis, and establish a left-handed coordinate system with the z-axis, then the horizontal direction to the right is the x-axis, and the vertical direction is the y-axis.

[0027] Such as figure 1 As shown, the present invention proposes an optical fiber differential interference pressure measurement device, which is applied to the principle of pressure measurement in a closed pipeline. Wherein 101-fluid pipeline to be tested. In addition, the detection device of the present invention includes: a fiber laser light source 201, a fiber coupling unit 202, a fiber beam expansion collimation unit 203, a reflection difference unit 204, a photoelectric detection unit 205, a storage unit 206, a computing unit 207, an optical fiber 208, and a pressur...

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Abstract

The invention provides a pressure measuring device and method of fiber difference interference. The device comprises a fiber laser unit, a fiber coupling unit, a reflection difference unit, a fiber beam expanding and collimating unit, a photoelectric detection unit, a storage unit and a signal processing unit; and the reflection difference unit includes a reflection phase grating of a special structural design, and used to cut reflected light waves. The reflection phase grating includes two non-light-transmission parts and two reflection light parts in one period; the two reflection light parts include a direct reflection part (without phase delay) and a pai-phase delayed reflectin part; and the duty ratio of the reflection phase grating is 1 / 2, namely, the proportion of the size of the non-light-transmission parts to that of the reflection light parts is 1 / 2. The device of the invention can be used to realize pressure measurement of high temperature and high corrosion, and has advantages including being resistant to electromagnetic interference and radiation. In addition, a differential pressure type flowmeter is combined to realize high-temperature medium flow measurement.

Description

technical field [0001] The invention belongs to the field of thermal fluid measurement, and relates to a pressure measurement device and method for optical fiber differential interference. Background technique [0002] The measurement of pressure and flow plays an important role in industrial production and process control, and it has wide application requirements in power plants, metallurgy, aviation, machinery and nuclear reactors and other fields. With the development of science and technology, the number of measurement objects is increasing, and the requirements for pressure measurement are also getting higher and higher, such as high temperature medium pressure measurement. Conventional pressure instruments currently used to measure gas or water media are not suitable for high-temperature liquid metal pressure measurement, especially high-temperature liquid heavy metals in liquid heavy metal reactors have higher requirements for pressure measurement, and they face harsh...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L11/02G01D5/353G01F1/34
CPCG01D5/35306G01F1/34G01L11/025
Inventor 吴宜灿黄群英朱志强李春京贺建
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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