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Optical fiber micro-displacement air pressure detecting device

An air pressure measurement device and micro-displacement technology, which is applied to measurement devices, optical devices, fluid pressure measurement using optical methods, etc., can solve the problems of increasing the cost and achieve the effects of convenient processing, simple operation, and saving manpower and material resources

Inactive Publication Date: 2013-12-18
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If an autocollimator with a larger diameter is used, its cost will be greatly increased

Method used

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  • Optical fiber micro-displacement air pressure detecting device
  • Optical fiber micro-displacement air pressure detecting device
  • Optical fiber micro-displacement air pressure detecting device

Examples

Experimental program
Comparison scheme
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Embodiment

[0036] according to figure 1 The structure diagram of the preliminary experimental verification device construction, such as Figure 6 shown. The light emitted by the 1550nm (±3nm, power 2-5mw) narrow-band light source 1 passes through the 2×2 coupling device 6 and then enters the optical fiber micro-displacement sensor. The output end face of the straightener 7 is emitted, and part of it is reflected back into the original optical fiber through a reference angle cone diaphragm 8 to become the reference light, and the other part is reflected back into the original fiber through the angle cone diaphragm 9 to be measured, which is the light to be measured. Light; the two light beams have an optical path difference due to the difference in arm length, and interference occurs in the fiber coupler 6. After the interference signal passes through a 3×3 coupler 3, two beams of light waves with two fixed phase differences are selected to pass through the photoelectric Converter 4 is ...

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Abstract

The invention discloses an optical fiber micro-displacement sensing device which detects gas pipeline air pressure. According to the device, two lens-type optical fiber auto-collimation devices and two pyramid film (one is a reference film, and the other is a film to be detected) are used for obtaining two coherent light beams which interfere in a 2*2 optical fiber coupler, three light beams with the phase difference being 2pai / 3 are obtained through a 3*3 coupler, and through a corresponding counting circuit and a phase judging circuit, pipeline pressure can be detected by processing the displacement of the film to be detected in real time. The optical fiber micro-displacement sensing device is scientific in design principle and clear in structure, parts are convenient to machine, and the device is mainly used for detecting pressure in a gas conveying pipeline. Transient state air pressure of the pipeline can be accurately detected, a real-time accurate data system is established for real-time changing of pipeline air pressure, and significance is achieved in automatic monitoring and managing of the pipeline.

Description

technical field [0001] The invention belongs to the field of optical precision measurement, in particular to a micro-displacement air pressure measurement device based on an optical fiber lens type autocollimator and a pyramid reflective membrane. Background technique [0002] With the improvement of people's living standards, gas energy such as natural gas has gradually become the mainstream energy demanded by people, and the uneven distribution of gas energy requires a complete gas pipeline system to realize its transportation. The real-time monitoring of the gas pipeline pressure can keep abreast of the gas transportation situation, and timely investigation of problems can be done, avoiding some adverse effects such as gas leakage. However, up to now, the vast majority of pipeline air pressure measurements have been made by mechanical barometers, which can only be measured manually without automatic measurement, resulting in low precision and low efficiency. The real-tim...

Claims

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Application Information

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IPC IPC(8): G01L11/02G01B11/02
Inventor 李建欣何勇秦北志黄慧马力崔艳军
Owner NANJING UNIV OF SCI & TECH
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