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Photorefractive optical lock-in vibration spectral measurement

机译:光折射光学锁定振动光谱测量

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An optical photorefractive frequency-domain method is described for measuring displacement amplitude and phase of vibrating surfaces. The method is applicable to diffusely scattering surfaces and usable in either a point-detection or imaging configuration. The method utilizes an optical lock-in approach to measure phase modulation of light scattered from continuously vibrating surfaces. Picometer displacement sensitivities have been demonstrated over a frequency range of 100 Hz to greater than 100 Hz. The response of the spectral method is independent of the vibration frequency above the photorefractive cutoff frequency, Two methods are described that produce a readout beam intensity that is a direct function of the vibration amplitude suitable for imaging. (C) 1997 Optical Society of America.
机译:描述了一种用于测量振动表面的位移幅度和相位的光学折光频域方法。该方法适用于散射表面,可用于点检测或成像配置。该方法利用光学锁定方法来测量从连续振动的表面散射的光的相位调制。在100 Hz至大于100 Hz的频率范围内已证明了皮克计的位移灵敏度。光谱方法的响应与光折射截止频率以上的振动频率无关。描述了两种方法,它们产生的读出光束强度是适合于成像的振动幅度的直接函数。 (C)1997年美国眼镜学会。

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