激光诱导等离子体干涉图相位信息的提取

分析了强激光在空气中产生等离子体干涉图的空间频谱特性，采用高阶契比雪夫数字递归滤波器和阈值自动调整的相位解包算法成功地撮了等离子体干涉图的相位信息。论述了对干涉图样进行数字滤波时的设计考虑，给出了实验结果。实验表明，这种方法可用于快速、瞬态光学干涉图样相位信息的提取。

Extracting Phase Inforndion from the Interferogram of Laser Breackdwn in Air

The spacial spectrum of the interferogram of plasma induced in air by high power infrared laser radiation is analysed. And the phase information' successfully is extracted from the interferogram by using high--order ChebyShev digital recursive filters and the phase unwrapping algorithm with ttrieshold auto-- adjustment. The designing considerations of high-order digital recursive filters are described and experiment results are given in this peper. The results show that this approach can be used for extracting phase information from high-speed or instant optical interferograms.