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Three-wave optical fiber laser self-mixing interference measurement method

A technology of self-mixing interference and fiber laser, applied in the field of optical measurement, can solve problems such as inability to measure speed, vibration, and step height

Inactive Publication Date: 2018-12-14
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. Can not measure the speed, vibration, step height and other parameters of the object

Method used

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  • Three-wave optical fiber laser self-mixing interference measurement method
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  • Three-wave optical fiber laser self-mixing interference measurement method

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Embodiment Construction

[0035] Attached below image 3 The present invention will be further described with specific embodiments.

[0036] Such as image 3 As shown, it consists of 980nm pump light source (S), three fiber couplers N1, N2, N3, three wavelength division multiplexers WDM1, WDM2, WDM3, three sections of erbium-doped optical fibers EDF1, EDF2, EDF3, two optical fibers Circulator C1, C2, six fiber gratings FBG11, FBG21, FBG31, FBG12, FBG22, FBG32, one FC / PC connector, three detectors PD1, PD2, PD3, two frequency shifters AOM1, AOM2, one exit head G, two drive power RF1, RF2, a mixer, signal processing circuit 1 (B1), signal processing circuit 2 (B2), signal processing circuit 3 (B3), signal processing circuit 4 (B4), signal processing circuit 5 (B5), computer (B6) and output result (B7). Among them, the Bragg wavelengths of the fiber Bragg gratings FBG11 and FBG12 are the same, the Bragg wavelengths of the fiber Bragg gratings FBG21 and FBG22 are the same, and the Bragg wavelengths of t...

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Abstract

The present invention discloses a three-wave optical fiber laser self-mixing interference measurement method, belonging to the technical field of optical measurement. A system comprises a pumping light source, three optical fiber couplers, three wavelength division multiplexers, three sections of Er-doped fibers, two optical fiber circulators, six fiber bragg gratings, an FC / PC contact, three detectors, two frequency shifters, an emitting head, two drive power sources, a mixer, a signal processing circuit 1, a signal processing circuit 2, a signal processing circuit 3, a signal processing circuit 4, a signal processing circuit 5, a computer and an output result. The optical fiber and the optical fiber device form three laser resonant cavities, the three sections of the Er-doped fibers arethree laser resonant cavity gain mediums, the fiber bragg gratings are wavelength selection elements to form a three-wavelength laser. After the three-wavelength laser is subjected to frequency shift,a referred object or a measured object reflects light of each laser resonant cavity and in the cavities to generate heterodyne self-mixing interference signals. The signals are processed to achieve measurement of each parameter.

Description

technical field [0001] The invention relates to the field of optical measurement, in particular to a three-wave fiber laser self-mixing interference measurement method. 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. "Profilemeasurement 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 measured surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35316G01D5/35374
Inventor 谢芳王辉
Owner BEIJING JIAOTONG UNIV