差动式双波混合干涉微小振动检测系统  

Differential Two-wave Mixing Interferometer for Micro-vibration Detection

作　　者：朱东旭 龚玉婷 刘维 孔明 王道档 ZHU Dongxu;GONG Yuting;LIU Wei;KONG Ming;WANG Daodang(College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China;College of Optical Sciences,University of Arizona,Tucson 85721,USA)

机构地区：[1]中国计量大学计量测试工程学院,杭州310018 [2]亚利桑那大学光学科学学院,美国图森85721

出　　处：《光子学报》2023年第6期273-282,共10页Acta Photonica Sinica

基　　金：浙江省自然科学基金(No.LY21E050016);国家自然科学基金(No.51775528)。

摘　　要：针对工业环境下粗糙金属表面微小振动的在线测量需求,提出了一种基于差动式双波混合干涉的微小振动检测系统。该系统将极性相反的高电压分别施加在两块硅酸铋晶体上以得到差动式双路振动解调信号,进而通过差分处理抑制对电压极性不敏感的噪声并提高灵敏度。为验证所提出方案的可行性,分别进行了仿真分析与实验验证。对一粘连在压电陶瓷上的紫铜片进行振动测量实验,并将振动测量结果分别与施加在压电陶瓷上的电压和激光测振仪的测量结果进行对比。结果表明,利用所提出检测系统可准确获得振动信号的频率、相位和幅值信息,与单路式结构相比,差动式双波混合干涉仪的灵敏度提高了一倍,信噪比从27.47 dB提高到了30.83 dB,相对误差的均方根值从3.07%降低到了1.42%。With the development of modern manufacturing and testing technology,micro-vibration detection technology for rough metal surface plays an important role in many fields,including material analysis,nondestructive testing,and mechanical system dynamic analysis.The piezoelectric transducer has been widely used in detecting the micro-vibration on rough metal surface,but it is not available to be used on hot or corrosive surface,and hardly to achieve in-line detection for the limited working distance.Several interferometers have been developed for distant detection of micro-vibration,which work well on mirror surface in the laboratory,however,those interferometers can hardly be used to detect micro-vibration of rough metal surface due to the environmental noise and wavefront mismatch.A micro-vibration detection system based on differential two-wave mixing interference is proposed to meet the requirements of non-contact measurement for micro-vibration on rough metal surface.It provides a simple and elegant solution to these problems arising in the above interferometers,which results from the replacement of a conventional beam splitter with a dynamic holographic grating continuously recorded in a photorefractive crystal.The dynamic holographic grating is modulated by the interference fringe and presents the same distribution,but the change of dynamic holographic grating is available only when the time constant of photorefractive crystal is larger than the change frequency of the interference pattern,which contributes to the fact that the proposed system has the ability of low-frequency noise suppression in non-laboratory environment.The dynamic holographic grating in the photorefractive crystal adapts the reference wavefront to the signal beam,which enables the vibration measurement on rough surface of metal.To reduce the fluctuation of the beam intensity,electric noise,and single measurement error,the proposed system adopts two nonlinear Bi12SiO20(BSO)photorefractive crystals to demodulate the vibration signals in the s

关 键 词：双波混合干涉 差动式 微小振动检测 噪声抑制 硅酸铋晶体 

分 类 号：TH741[机械工程—光学工程]