Spectral confocal technology is widely used in the field of object contour scanning with non-contact measurement. For high-speed collection of spectral confocal signal, the collection speed is not only related to the integration time of the photodetector but limited by the efficiency of reading out the spectral signal from the detector. In order to solve this problem, a spectral confocal signal collection method based on acquisition and tracking algorithm with variable window width is proposed to improve the data collection efficiency. The algorithm improves collection efficiency by only collecting the useful signals in the spectrum. The simulation results show that the signal collection efficiency with the proposed algorithm for the CMOS sensor is improved significantly compared to the conventional method. For smooth object surfaces, the data collection efficiency is improved above 44.5 times. It is proved that the proposed method in this paper providing a novel approach for implementing high-speed collection of spectral confocal signal.
A split-step birefringence simulation method is proposed to investigate the gating efficiency and intensity distribution of the Kerr signal field considering the evolution of the switch beam and probe beam in their path. Using this simulation method, we investigated the switch-beam power-dependent gating efficiency and conducted an experiment to prove its reliability. Furthermore, we analyzed the optical intensity distribution of the Kerr signal exiting the Kerr medium under different switch-beam powers. This study provides an effective theoretical tool for the design and optimization of optical Kerr gates.
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