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Dual acousto-optic modulation phase conjugate heterodyne detection device

A phase conjugation and acousto-optic modulation technology, applied in the field of physical optics, can solve the problems of inability to use radio frequency technology to process the phase, no reference optical path, difficult to eliminate interference, etc. The effect of stressing the influence of conditioning

Active Publication Date: 2017-01-18
ZHONGBEI UNIV
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Problems solved by technology

[0004] The disadvantage of this vibration measurement method is that it does not have a reference optical path and cannot use radio frequency technology to process phase (amplitude) signals
Therefore, it is difficult to eliminate the interference of common-mode noise and low-frequency noise (also called 1 / f noise) caused by environmental factors

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  • Dual acousto-optic modulation phase conjugate heterodyne detection device

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Embodiment Construction

[0022] The specific implementation method of the present invention will be described below in conjunction with the accompanying drawings.

[0023] figure 1 As shown, a dual acousto-optic modulation phase conjugate heterodyne detection device of the present invention includes a device for generating two orthogonally polarized light beams perpendicular to each other, a phase reference device, a micro-vibration amplitude (phase) measurement device, and data acquisition and processing display The device is characterized in that: the micro-vibration amplitude (phase) measuring device is a device that can eliminate the "speckle noise" contained in the reflected light on the surface of the measured object, and the described device can eliminate the reflected light on the surface of the measured object The "speckle noise" device contained in , consists of a beam expander 14, two polarization beam splitters, namely the first polarization beam splitter 15 and the second polarization bea...

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Abstract

The invention provides a dual acousto-optic modulation phase conjugate heterodyne detection device. The device is characterized in that light energy can be effectively utilized, the device is suitable for weak signal measurement, the vibration and spectrum of micro vibration can be obtained, a Soleil-Babnet phase compensator can be used to obtain the phase generated by the amplitude of micro vibration; by comparing a reference light path and a measurement light path, the common mode noise generated by an environmental factor change is greatly reduced, and the measurement precision is improved; the phase conjugate light with a phase compensation characteristic generated by a photorefractive crystal is used, the 'speckle noise' generated by the surface of a detected object is eliminated, and the surface of the detected object is expanded to a comparatively rough surface from an approximate mirror; a dual acousto-optic modulator is used to obtain two mutually vertical orthogonal polarized light, the influence of acousto-optic modulator light intensity modulation is eliminated, the high precision measurement of the amplitude is easy to realize; and the beat frequency of the dual acousto-optic modulator is an intermediate frequency difference, the processing of a low frequency signal in a radio frequency range is realized, and the interference of a low frequency noise is eliminated.

Description

technical field [0001] The invention belongs to the field of physical optics, and is a dual acousto-optic modulation phase conjugate optical heterodyne detection device proposed based on the characteristics of lasers, dual acousto-optic modulators and photorefractive crystals. Background technique [0002] Compared with direct detection technology, optical heterodyne detection technology has high sensitivity, and its measurement accuracy is 7-8 orders of magnitude higher, so it has a wide range of applications in weak signal detection; but in order to obtain interference signals with high signal-to-noise ratio , the requirement for the smoothness of the surface of the measured object is relatively high. Generally speaking, the closer to the smooth surface, the better the signal-to-noise ratio. For the rough surface of the measured object, the reflected light carries a lot of "speckle noise", which brings great difficulties to high-precision measurement. [0003] Chinese inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/00
Inventor 张志伟郑宾张文静郭华玲刘利平
Owner ZHONGBEI UNIV
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