• Acta Photonica Sinica
  • Vol. 49, Issue 12, 83 (2020)
Ting-ting YU1、2, Yu-tao FENG1, Di FU1, Xuan WANG1、2, Chen SUN1、2, and Qing-lan BAI1
Author Affiliations
  • 1Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an709, China
  • 2University of Chinese Academy of Sciences, Beijing100049, China
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    DOI: 10.3788/gzxb20204912.1230001 Cite this Article
    Ting-ting YU, Yu-tao FENG, Di FU, Xuan WANG, Chen SUN, Qing-lan BAI. Analysis of Influence of Spike on Phase Retrieval Accuracy of Doppler Asymmetric Spatial Heterodyne Spectrometer and Correction Method[J]. Acta Photonica Sinica, 2020, 49(12): 83 Copy Citation Text show less

    Abstract

    The doppler asymmetric spatial heterodyne interferometer can be used to retrieve the atmospheric wind speed by measuring the phase frequency shift of interference fringes. Because of the interference from cosmic rays and “hot pixels” in CCD, some spikes that have random location and intensity occur on the interferogram. The presence of such spikes can seriously affect the accuracy of wind speed retrieval. In this paper, the theoretical influence of various parameters of spike on the phase inversion accuracy of doppler asymmetric spatial heterodyne interferometer is discussed, and the spike correction method is proposed. Based on the characteristics of the spike and the phase retrieval model of doppler asymmetric spatial heterodyne interferometer, a theoretical model between the phase error and the intensity and position of the spike is established. The influence of the intensity, position and width of the spike on the phase retrieval accuracy is analyzed and verified by experiments. The results show that the phase retrieval error varies periodically with the position of the spike, and is positively correlated with the intensity and peak width of spike. A new method of spike correction based on nearest neighbor comparison and windowed median filter is proposed. The new method can effectively correct the spike without affecting the original interference data. The phase error caused by the spike after correction is reduced by more than 90%, which will help to improve the accuracy of subsequent interference data processing.
    Ting-ting YU, Yu-tao FENG, Di FU, Xuan WANG, Chen SUN, Qing-lan BAI. Analysis of Influence of Spike on Phase Retrieval Accuracy of Doppler Asymmetric Spatial Heterodyne Spectrometer and Correction Method[J]. Acta Photonica Sinica, 2020, 49(12): 83
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