Do we need all the frequency components of a fringe signal to obtain position information in a vertical scanning wideband interferometer?
Do we need all the frequency components of a fringe signal to obtain position information in a vertical scanning wideband interferometer?
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DOI：
10.1016/j.optcom.2018.08.056
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发表时间：
2019
影响因子：
2.4
通讯作者：
D. Wei;Muzheng Xiao;Ping Yang
中科院分区：
文献类型：
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作者：
D. Wei;Muzheng Xiao;Ping Yang
利用基于宽带光源的垂直扫描干涉仪，我们可以从干涉条纹信号包络的峰值中获得物体的位置信息。为了重构该信号的包络，有必要选择其频率分量;然而，自然产生的问题是是否需要选择信号的所有频率分量来确定包络峰值的位置。基于我们提出的方法和随后的光学实验，我们发现，可以估计的峰值位置的包络线只使用具有高的信号噪声比的频率对。因此，这种观察不仅可以应用于改善宽带扫描干涉仪的测量性能，而且还可以实现更复杂和更精确的光学计量。
Using a wideband light source based vertical scanning interferometer, we can obtain the position information of an object from the peak value of the envelope of the interference fringe signal. For the reconstruction of the envelope of this signal, it is necessary to select its frequency components; however, the question that naturally arises is whether there is a need to select all the frequency components of the signal to determine the position of the envelope peak. Based on our proposed method and subsequent optical experiments, we find that the peak position of the envelope can be estimated using only the frequency pairs that have high signal-to-noise ratios. Thus, this observation can be applied to not only improve the measurement performance of wideband scanning interferometers, but also to enable more complex and accurate optical metrology.