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首页> 外文会议>International conference on applications of optics and photonics >Detection of low frequency, out-of-plane vibrations by the Talbot effect and adaptive photodetectors
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Detection of low frequency, out-of-plane vibrations by the Talbot effect and adaptive photodetectors

机译：通过Talbot效应和自适应光电探测器来检测低频平面外振动

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Detection and measurement of low frequency, out-of-plane vibrations play a very important role in several metrological applications. Classical interferometry is well suited for measuring small amplitudes of vibrations, ranging from picometers up to micrometers, but its use is limited to a laboratory environment. Here we consider the Talbot effect and the so-called adaptive photodetectors based on the non-steady-state photo-electromotive force effect for the measuring of low frequency, out-of-plane of vibrations of flat objects with rough surfaces and with amplitudes of vibrations in the order of microns. The adaptive photodetectors produce an electrical current proportional to the square of the visibility of the vibrating intensity pattern impinging on them. In the method here proposed, the vibrating object with rough surface is illuminated with a beam diffracted by a grating (a Ronchi grating), the light reflected by the object is collected by a lens and imaged on to a home-made GaAs adaptive photodetector. The electrical current from the adaptive photodetector is proportional to the instantaneous position of the vibrating object; this signal is monitored and measured with an oscilloscope connected to a lock-in output. The method is very robust and adequate for environments subjected to perturbations and presents the possibility of adjusting its dynamical range by modifying the period of the grating employed. Experimental results that verify our proposal are presented.
机译：低频平面外振动的检测和测量在几种计量应用中起着非常重要的作用。经典的干涉仪非常适合测量小幅度的振动，从皮克级到微米级，但其使用仅限于实验室环境。在这里，我们考虑了基于非稳态光电动势效应的Talbot效应和所谓的自适应光电探测器，用于测量具有粗糙表面和振幅为振动的数量级为微米。自适应光电探测器产生的电流与撞击在其上的振动强度图案的可见度的平方成正比。在这里提出的方法中，用光栅（Ronchi光栅）衍射的光束照射具有粗糙表面的振动物体，物体反射的光被透镜收集并成像到自制的GaAs自适应光电探测器上。来自自适应光电探测器的电流与振动物体的瞬时位置成正比。该信号通过连接到锁定输出的示波器进行监视和测量。该方法非常健壮，并且适合遭受扰动的环境，并且存在通过修改所用光栅的周期来调整其动态范围的可能性。实验结果验证了我们的建议。

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