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有限光束在湍流大气中传输时除产生强度和相位起伏外,还存在抖动与扩展现象,对某些激光工程造成有害的影响。过去常用照相法或一维光机扫描法进行测量。前者不能用于红外光,而且需要一套复杂的后处理设备,后者不能用于脉冲光,而且精度较低。电视摄象技术可以克服上述缺点。但图象数据的频带较宽,数据量很大,任何环节的人工处理是难以承受的,而一般微计算机也难以胜任。我们采用变速扫描方案就能实现微计算机自动采集与运算。全部方案由摄象机、录象机、视频存贮器,数据采集器,微计算机和假彩色监示器组成。首先以正常电视制式存贮图象,然后慢速读出,一秒钟时间即可输入一帧图象至微计算机,最后进行等效直径及强度重心等运算,对多帧图象作统计平均后就可求出抖动方差与扩展方差。
In addition to generating the intensity and phase fluctuations of a finite beam propagating in a turbulent atmosphere, there is also jitter and spreading phenomena that can have detrimental effects on some laser projects. In the past commonly used photographic method or 1-dimensional optical scanning method for measurement. The former can not be used for infrared light and requires a complicated set of post-processing equipment which can not be used for pulsed light and has low accuracy. Television camera technology can overcome the above shortcomings. However, since the image data has a wide frequency band and a large amount of data, it is unmanageable for manual processing of any part of the image, and the general microcomputer is also difficult to handle. We use variable speed scanning solution to achieve micro-computer automatic acquisition and computing. All programs by the camera, video recorder, video memory, data acquisition, micro-computer and false color monitor components. First of all, the normal television system to store images, and then read slowly, a second you can enter a frame of images to the microcomputer, the last equivalent diameter and intensity center of gravity and other operations, the statistical average of multi-frame images After you can find the jitter variance and expansion of variance.