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Absolute distance dynamic measurement system based on swept-frequency interferometer, and measurement method of absolute distance dynamic measurement system

A technology of absolute distance and frequency sweeping interference, which is applied in the direction of radio wave measurement systems, measuring devices, instruments, etc., can solve the problems of low measurement accuracy, achieve the effect of improving measurement accuracy and eliminating Doppler effect

Active Publication Date: 2016-12-14
HARBIN INST OF TECH
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Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of low measurement accuracy of the existing measurement system under the influence of vibration. The present invention provides a dynamic absolute distance measurement system and its measurement method based on a frequency-sweeping interferometer

Method used

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  • Absolute distance dynamic measurement system based on swept-frequency interferometer, and measurement method of absolute distance dynamic measurement system
  • Absolute distance dynamic measurement system based on swept-frequency interferometer, and measurement method of absolute distance dynamic measurement system
  • Absolute distance dynamic measurement system based on swept-frequency interferometer, and measurement method of absolute distance dynamic measurement system

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Embodiment Construction

[0040] In order to eliminate the influence of the Doppler effect introduced by the change of the optical path of the measurement path, a new dynamic absolute distance measurement system is proposed in this embodiment, such as image 3 As shown, including data acquisition card, No. 1 detector, balance detector, No. 2 detector, auxiliary interferometer, external cavity laser, visible laser, single-frequency laser, No. 1 acousto-optic modulator, No. 2 acousto-optic modulator No. 1 fiber coupler, No. 2 fiber coupler, No. 3 fiber coupler, No. 4 fiber coupler, No. 1 coupler, No. 2 coupler, No. 3 coupler, No. 4 coupler, No. 5 coupler , polarization maintaining beam splitter PBS, wavelength division multiplexer WDM, fiber end face, focusing system and quarter wave plate;

[0041] No. 1 fiber coupler, No. 2 fiber coupler, No. 3 fiber coupler and No. 4 fiber coupler are all 99:1 split fiber couplers;

[0042] No.1 coupler, No.2 coupler, No.3 coupler, No.4 coupler and No.5 coupler are all...

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Abstract

The invention discloses an absolute distance dynamic measurement system based on a swept-frequency interferometer, and a measurement method of the absolute distance dynamic measurement system, and belongs to the field of absolute distance dynamic measurement. The invention aims at solving a problem that a conventional measurement system is low in measurement precision under the impact of vibration. The system comprises two parts, wherein one part is used for carrying out the FSI absolute distance measurement, and the other part is used for carrying out the real-time monitoring of a target displacement through employing an additional heterodyne interferometer which consists of a single frequency laser and an acoustic optical modulator, thereby eliminating the impact from a Doppler effect introduced by the change of an optical path of a measurement path. The method comprises the step: obtaining an absolute distance (shown in the description) through employing the signals detected by a first detector, a second detector and a balance detector in the measurement system. A signal obtained by the second detector is used for correcting an error caused by the instable modulation frequency of the acoustic optical modulator.

Description

technical field [0001] The invention relates to a method for dynamic measurement of absolute distance based on frequency-sweeping interferometer, which belongs to the field of dynamic measurement of absolute distance. Background technique [0002] Laser chirp continuous wave technology makes use of the characteristics of tunable lasers to be continuously adjustable in a large range for measurement. Generally, lasers cannot achieve absolute linear frequency modulation. In order to overcome the influence of nonlinear frequency modulation, the commonly used method is frequency sampling method. [0003] The schematic diagram of the optical path structure of the existing absolute distance measurement system is as follows: figure 1 shown. [0004] The frequency sampling method uses the auxiliary interferometer signal as the sampling clock of the data acquisition card, thereby eliminating the influence of the nonlinear frequency modulation of the tunable laser. After the frequenc...

Claims

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Application Information

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IPC IPC(8): G01S17/32G01S17/50G01S7/481
CPCG01S7/4814G01S17/32G01S17/50
Inventor 甘雨刘国栋刘炳国路程陈凤东胡涛
Owner HARBIN INST OF TECH
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