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Heterodyne interference optical path structure based on optical fibers and laser vibrometer

A laser vibrometer and heterodyne interference technology, applied in the field of interferometry, can solve the problems of lowering the optical efficiency of the interference system, low system reliability, and difficulty in making the system small, so as to improve the measurement efficiency and enhance the reliability of the interference. The effect of improving performance and accuracy

Pending Publication Date: 2018-12-07
YUYAO SUNNY OPTICAL INTELLIGENCE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design of the free-space optical path makes it difficult to reduce the volume of the system, and because the optical components need to be installed on the optical adjustment seat, the reliability of the entire system is not high, and the slight deformation of the adjustment seat will quickly reduce the optical efficiency of the entire interference system

Method used

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  • Heterodyne interference optical path structure based on optical fibers and laser vibrometer
  • Heterodyne interference optical path structure based on optical fibers and laser vibrometer
  • Heterodyne interference optical path structure based on optical fibers and laser vibrometer

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Embodiment 1

[0063] Such as figure 1 As shown, this embodiment provides a fiber-based heterodyne interference optical path structure, including:

[0064] A first fiber coupler 201, a fiber frequency shifter 202, a second fiber coupler 203, a fiber looper 204, and an optical transceiver 205;

[0065] The first optical fiber coupler 201 is used to divide the received light into two beams and transmit them to the optical fiber frequency shifter 202 and the optical fiber looper 204 respectively;

[0066] The optical fiber frequency shifter 202 receives and modulates the beam transmitted by the first optical fiber coupler 201, shifts the optical frequency of the beam and transmits it to the second optical fiber coupler 203;

[0067] The optical fiber looper 204 includes a first port P1, a second port P2, and a third port P3; the first port P1 receives the light beam transmitted by the first optical fiber coupler 201; the second port P2 is connected to the The optical transceiver 205 is connec...

Embodiment 2

[0076] The difference between this embodiment and Embodiment 1 is that this embodiment supplements the structure of the heterodyne interference circuit in detail, the optical fiber is a polarization-maintaining optical fiber, the first optical fiber coupler 201, the optical fiber frequency shifter 202 , the second fiber coupler 203 and the fiber circulator 204 are polarization maintaining fiber devices, that is, the first fiber coupler 201 and the second fiber coupler 203 are polarization maintaining fiber couplers, fiber frequency shifters 202 is a polarization maintaining optical fiber frequency shifter, and the optical fiber looper 204 is a polarization maintaining optical fiber looper.

[0077] The polarization-maintaining optical fiber and the polarization-maintaining optical fiber and each polarization-maintaining optical fiber device are connected with APC fiber connectors with an angle of 8 degrees; the angle of 8 degrees refers to the inclination angle of the fiber end...

Embodiment 3

[0093] The difference between this embodiment and embodiment 2 is that, as Figure 5 As shown, the optical transceiver 205 in this embodiment includes an optical head and a polarized optical element 2052, the optical head includes a front mirror group 2053 and a rear mirror group 2054, and the light beam transmitted by the second port P2 passes through the rear mirror group The lens group 2054 is focused to the first focal point and projected to the polarizing optical element 2052 through the front lens group 2053 . Specifically, the rear mirror group 2054 and the front mirror group 2053 are coaxially placed successively at the front end of the light end face, the Gaussian beam output by the optical fiber is focused to the first focal point through the rear mirror group 2054, and the front mirror group 2053 images the focused spot of the first focal point to The surface of the object to be measured. There is an object-image conjugate relationship between the measured point an...

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Abstract

The invention relates to the technical field of interferometry, and discloses a heterodyne interference optical path structure based on optical fibers and a laser vibrometer. The optical path structure includes a first optical fiber coupler, an optical fiber frequency shifter, a second optical fiber coupler, an optical fiber loop detector and an optical transceiver, which are connected by opticalfibers and constitute a heterodyne interference loop. The laser vibrometer includes a measuring laser source, a balanced photoelectric detector and the optical path structure. The measuring laser source is connected with the input end of the first optical fiber coupler through an optical fiber, and the balanced photoelectric detector is connected with the output end of the second optical fiber coupler through an optical fiber. Through connection by optical fibers, the characteristics of small size and high reliability are achieved. Through the heterodyne interference optical path, the opticalpath system has high signal-to-noise ratio and anti-interference ability and can be used to measure geometric parameters such as length, displacement, straightness and flatness in the field of precision measurement.

Description

technical field [0001] The invention relates to the technical field of interference measurement, in particular to an optical fiber-based heterodyne interference optical path structure and a laser vibrometer. Background technique [0002] In recent years, with the continuous development of science and technology, the application of vibration measurement has become more and more extensive. Vibration measurement includes contact measurement and non-contact measurement. In non-contact measurement, due to the good directionality, monochromaticity and coherence of laser And other characteristics, laser measurement technology is widely used in the measurement of various military targets and precision civilian measurements, especially in the measurement of various weak vibrations, the speed of target movement and its small changes, etc. It has high sensitivity and accuracy. The existing laser vibrometers also have diversified development trends, among which the miniaturization and h...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 刘红巍宋云峰杨兴李大猛宋耀东周昊陈华钧
Owner YUYAO SUNNY OPTICAL INTELLIGENCE TECH CO LTD
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