条纹管失真效应分析及其对多狭缝成像的影响

设计了一套多狭缝(MS)条纹管成像系统\.在成像过程中,激光经扩束之后照射到目标上,目标的反射光经过接收系统聚焦在光纤图像变换器上,将面图像变换为线图像后,耦合到条纹管光电阴极上,在条纹管的偏转电压作用下,对不同距离目标回波信号进行不同程度的偏转,再经过图像的还原,获得不同目标的距离像。在图像的还原过程中,条纹管在荧光屏上的成像失真问题严重影响图像的恢复能否成功。对条纹管成像失真原因及其对图像还原的影响进行了分析,模拟了条纹像出现不同失真时对图像还原的影响,结果表明,条纹图像的拉伸达到5%左右或者局部倾斜达到0.5%时即可对目标图像的还原造成明显的影响。

Distortion of Streak Tube and Its Effection to Multiple Streaks-Streak Tube Imaging Lidar

A flash imaging lidar system based on multiple streaks (MS)-streak tube was designed. In the imaging process, the laser beam after expanding was irradiated on the target, and the light reflected by the target was focused on the fiber image transformer through receining antena. The line images transformed from plane image will be coupled to the photocathode of streak tube through an optical taper. The photoelectrons excitated by the line images are accelerated and deflected by the deflecting voltage: And then they were imaged on the phosphor of the streak tube and captured by a CCD camera. In order to remap the line images to area image, the distortion effect of streak tube must be corrected, for it will seriously affect the final image remapping. The reason and effect of the distortion is analyzed in this paper. Distoration of streak image and its effect to image remapping is simulated. The results show that 5% elongated or 0.5% local dip will seriously influence the remapped quality of target image.