High-accuracy remote absolute displacement measurement system based on optical fiber composite interference

A technology of absolute displacement and optical fiber composite, applied in the field of optical measurement, can solve the problems of small measurement range, inability to perform absolute measurement, and inability to measure, and achieve high-precision measurement

Inactive Publication Date: 2012-07-11
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0015] 1. Only local displacement can be measured, remote measurement is not possible
[0016] 2. The measurement range is limited by the wavelength λ of the incident light

Method used

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  • High-accuracy remote absolute displacement measurement system based on optical fiber composite interference
  • High-accuracy remote absolute displacement measurement system based on optical fiber composite interference
  • High-accuracy remote absolute displacement measurement system based on optical fiber composite interference

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[0030] Attached below image 3 And the specific embodiments further describe the present invention.

[0031] Such as image 3 As shown, a high-precision remote absolute displacement measurement system based on fiber composite interference consists of a broadband light source S1, a fiber isolator I1, three 3dB-couplers N1, N2, and N3, and four autocollimating mirrors G3, G4, G7 and G8, two fiber gratings FBG1 and FBG2, four mirrors G1, G2, G5 and G6, two detectors PD1 and PD2, circulator H1, one-dimensional translation stage M, piezoelectric ceramic PZT, feedback control circuit B4, signal generator B5, signal processing circuit B1, A / D conversion card B2, computer B3 and result output B6. This measurement system contains two fiber interferometers M1 and M2. One fiber interferometer (sensing fiber interferometer) M1 is placed in the measured field to sense the measured displacement, and the other fiber interferometer (demodulation fiber interferometer) M2 is used The value of the...

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Abstract

The invention discloses a high-accuracy remote absolute displacement measurement system based on optical fiber composite interference, which belongs to the technical field of optical measurement and is composed of a board band light source, an optical fiber isolator, three 3dB couplers, four auto-collimation mirrors, two optical fiber gratings, four reflectors, two detectors, a circulator, a one-dimensional translation platform, piezoelectric ceramics, a feedback control circuit, a signal generator, a signal treatment circuit, an analog to digital (A/D) conversion card, a computer and result output. The high-accuracy remote absolute displacement measurement system uses an optical fiber interferometer to induce displacement and another optical fiber interferometer to demodulate displacement to achieve remote measurement. The optical fiber interferometer for demodulation works in a low coherence interference state and a high coherence interference state, and amplitude of displacement can be determined by low coherence signals to achieve absolute measurement. A value of the displacement can be measured by high coherence signals to feed back and control effects of environment interference on the demodulating optical fiber interferometer, and high-accuracy measurement can be obtained.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a high-precision remote absolute displacement measurement system based on optical fiber composite interference. Background technique [0002] The existing literature close to this technology has the following two: [0003] [1] D.P.Hand, T.A.Carolan, J.S.Barton, and J.D.C.Jones. "Profile measurement of optically rough surfaces by fiber-optic interferometry", Opt.Lett., Vol.18, No.16, 1993, P.1361-1363 .(Optics Letters, Vol. 18, No. 16, P.1361-1363) [0004] The technical principle of literature [1] is as follows: figure 1 shown. [0005] The light emitted by the semiconductor laser passes through the Faraday isolator and the fiber 3dB-coupler, and then reaches the measuring head. The measuring head is a Fizeau interferometer. A part of the light is reflected by the end face of the fiber as the reference light, and the other part of the light is focused by the self-f...

Claims

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Application Information

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IPC IPC(8): G01B11/02
Inventor 谢芳马森刘义秦李昭莹
Owner BEIJING JIAOTONG UNIV
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