Analysis of a data-based TV–holography system used to measure small vibration amplitudes
Analysis of a data-based TV–holography system used to measure small vibration amplitudes
复制标题
用于测量小振动幅度的基于数据的电视全息系统的分析
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
G. O. Rosvold
中科院分区：
文献类型：
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作者：
S. Ellingsrud;G. O. Rosvold
我们提出了一个系统，测量全场的振幅和相位分布的对象，振动幅度小。该系统是基于电视全息相结合的正弦相位调制，离散振动相移，和数字图像处理。不同的新算法，基于线性近似的条纹函数，进行了讨论。平均技术，用于减少噪声源的影响，提高系统的分辨率，也介绍了。对于其中一种算法，结合平均技术进行测试，振幅阈值约为所施加激光波长的1/3000。幅度分辨率是相同的量级。相位精度与振幅有关，振幅大于5 nm时约为3°。
We present a system that measures the full-field amplitude and phase distributions of objects that vibrate with small amplitudes. The system is based on TV–holography combined with sinusoidal phase modulation, discrete vibration-phase shifts, and digital image processing. Different new algorithms, based on a linear approximation of the fringe function, are discussed. Averaging techniques, used to reduce the effects of noise sources and to increase the resolution of the system, are also introduced. For one of the algorithms, tested in combination with the averaging techniques, the amplitude threshold was approximately 1/3000 of the wavelength of the applied laser light. The amplitude resolution was of the same magnitude. The phase accuracy is amplitude dependent and was about 3° for amplitudes greater than 5 nm.