532nm激光对TDI线阵推扫相机干扰效果评估

Assessment of the Jamming Effect of 532nm Continuum Laser Dazzling TDI Push-Broom Camera

拟探讨激光对TDI(时间延迟积分)线阵推扫相机的干扰能力评估问题。实验中利用电动转台建立了激光干扰TDI线阵推扫相机的实验平台。评估理论方法上基于光学传递函数、成像对比度建立了一种干扰评估准则。获得了不同入瞳功率条件下的干扰图像。建立了激光干扰能力与图像对比度的关系,即在典型目标空间调制度对比度下降到0.01之后图像无法被人眼有效识别的判据条件。对获得的实验干扰图像进行分析表明,激光还能够对饱和区域外的图像造成有效干扰。在入瞳激光功率小于50mW时,532nm激光对Dalsa 4k、8kTDI线阵推扫相机的实验评估表明,干扰范围约为饱和区域的4倍。开展了532nm连续激光对TDI线阵推扫相机的干扰效果实验,建立了一种基于光学传递函数、成像对比度的干扰评估方法,并对实验结果进行了干扰效果评估。研究结果对图像评估以及激光防护等应用具有一定参考价值。

This paper studies assessment of laser dazzling of laser jamming TDI （Time Delay and Integration） push- broom camera. An experimental system is established with an electric turntable for laser dazzling TDI push-broom camera. A dazzling assessment criterion is proposed based on optical MTF （Modulation Transfer Function） and im- age contrast theory. First, dazzling images are obtained with different pupil laser powers. A relationship between la- ser dazzling effect and imaging contrast is established. As determined by the criterion, the image shall be no longer recognizable by standard human eyes as the space modulation contrast drops to below 0.01. Analysis of the experi- mental images with this criterion shows that the expanded areas beyond the saturation field are dazzled by laser jam- ming. As demonstrated with 532 nm laser for a Dalsa 4k and 8k TDI push-broom camera at 50 mW pupil laser pow- er, the effectively dazzled area is about 4 times that of the saturation area. A dazzling assessment criterion is pro- posed based on optical MTF and image contrast theory. With this criterion, experimental results are assessed. The research is valuable to industrial applications such as image processing and laser protection.