快速旋转式偏振成像探测装置的设计

为了获取更快的偏振成像探测速率,本文对现有的机械旋转式偏振成像装置进行了改进,设计了连续旋转检偏器的成像方式,并改进图像处理过程,进一步提高了偏振成像速度。该装置克服了传统机械旋转式偏振成像装置体积大、成像速度慢、效率低的不足,利用电机带动检偏器快速匀速旋转,并与相机的曝光同步,能够快速便捷地实现偏振图像的获取。同时为了实现更高的偏振图像采集速率,对偏振图像采用了流水线式的处理方式,利用每相邻的3幅强度图解算得到偏振图像,使偏振图像与强度图像具有相同的成像速率。经过测试,该装置能够很好地完成偏振图像的采集,获取被测目标的偏振度和偏振角,在稳定工作状态下平均获取一幅偏振信息耗时0.033 s,且具有较好的工作稳定性。本文所做工作提升了机械旋转式偏振成像仪的工作效率,也为进一步提升机械式偏振成像仪的成像速度、实现对运动目标探测打下了基础。

Developement of rapid rotary polarization imaging detection devices

To obtain a faster rate of polarization imaging detection, this study has improved the existing mechanical rotary polarization imaging device and designed a continuously rotating polarizer imaging device. Image processing flow and polarization imaging speed were also improved. This device overcomes the shortcomings of traditional mechanical rotating polarization imaging with a large volume and slow imaging speed. The system uses a motor to control the polarizer to rotate quickly and smoothly, the camera to work synchronously for the quick acquisition of the polarized image. Simultaneously, the polarization image is pipelined to achieve a higher polarization image acquisition rate, and each three adjacent intensity diagrams are used to calculate the polarization image which resulted in the same imaging rate of polarization image and intensity image. Experiments show that the device has good working stability and can complete the acquisition of polarized images well. Moreover, it can obtain polarization information through the polarization and polarization angle with an average acquisition time of 0.033 s. This work improves the detection speed of the mechanical rotary polarization imager and enables the enhancement of the mechanical polarization imaging speed and achievement of the basis of detecting moving targets.