Fiber laser single-wave self-mixing interference displacement measuring system

A technology of self-mixing interference and displacement measurement, which is applied in the field of optical measurement, can solve problems such as difficulty in improving measurement accuracy, and achieve the effects of being easy to carry, improving anti-interference performance, and improving measurement accuracy

Inactive Publication Date: 2015-05-20
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] 1. Difficult to measure objects with low reflectivity
[0016] 2. The measurement results are aff

Method used

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  • Fiber laser single-wave self-mixing interference displacement measuring system
  • Fiber laser single-wave self-mixing interference displacement measuring system
  • Fiber laser single-wave self-mixing interference displacement measuring system

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Example Embodiment

[0031] Attached below image 3 The present invention will be further described with specific embodiments.

[0032] like image 3 As shown, a fiber laser single-wave self-mixing interference displacement measurement system consists of a 980nm pump source S1, a 1310nm semiconductor laser L1, three fiber isolators I1, I2, and I3, an erbium-doped fiber F1, and five fiber gratings FBG. 11 , FBG 12 , FBG 21 , FBG 22 , FBG 23 , 3dB coupler N1, piezoelectric ceramic PZT, variable optical attenuator VOA, collimator mirror G1, circulator H1, two detectors PD1 and PD2, wavelength division multiplexer WDM, signal processing circuit B1, feedback control circuit B2, A / D conversion card B3, computer B4 and output result B5. This measurement system uses a pair of fiber grating FBGs with the same reflection wavelength 11 and FBG 12 As a laser cavity mirror, the erbium-doped fiber is used as the gain medium, and the single laser wave emitted is fed back into the cavity by the measured o...

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Abstract

The invention discloses a fiber laser single-wave self-mixing interference displacement measuring system, and belongs to the technical field of optical measuring. The system comprises a pumping source, a laser device, five optical fiber gratings, three optical fiber isolators, two detectors, an Er-doped fiber, piezoelectric ceramic, a 3dB coupler, a circulator, a collimating mirror, a wavelength division multiplexer, a variable optical attenuator, a signal processing circuit, a feedback control circuit, an A/D (analog to digital) conversion card, a computer and result output. A pair of optical fiber gratings with the same reflection wavelength is used as a laser resonator mirror to generate single-wavelength laser; the single-wavelength laser is projected to a measured object surface, reflected or scattered back to a laser cavity through a measured object to generate self-mixing interference with light in the cavity, so that displacement measuring with nano-scale resolution is realized. The system can measure a low-reflectivity object due to an amplifying effect of a gain medium in the laser cavity; output wavelength of the laser device is stabilized through feedback control, so that the measuring precision is greatly improved; the fiber laser device is not only a sensor, but also an interferometer, is simple in structure and easy to carry.

Description

technical field [0001] The invention relates to the field of optical measurement, in particular to a fiber laser single-wave self-mixing interference displacement measurement system. 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, Volume 18, Issue 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. 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-focusing lens and projected On the m...

Claims

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Application Information

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IPC IPC(8): G01B11/02
Inventor 谢芳王韵致陈亮马森赵可强
Owner BEIJING JIAOTONG UNIV
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