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新型静态偏振风成像干涉仪采用四面角锥棱镜与偏振阵列的组合结构,在CCD的四个分区上一次得到四个不同相位的干涉图,可以实现对目标的实时探测,克服了动镜扫描探测模式不能对快速变化目标进行精确探测的缺陷.由于光束被四等分,强度大幅度下降,微弱的气辉信号能否被探测到成为研究的关键.本文从目标气辉光谱的特性出发,分析了静态偏振风成像干涉仪系统的光学传输特性和响应特性,CCD的噪声水平及系统信噪比,得出弱信号夜气辉在常规的探测模式下探测不到的结论.采用延长光积分时间,像素合并技术和选用探测灵敏度高的电子倍增CCD等措施,均可以有效改善信噪比,并计算出几种措施综合运用后系统的信噪比和响应度.考虑到成本和目标的快速变化,仅采用像素合并技术,模拟了信噪比和数字化输出随辐射强度的变化曲线,结果表明可实现对夜气辉等微弱信号的探测.
The new static polarization wind imaging interferometer uses the combination of the four-sided pyramid prism and the polarization array to obtain four interferograms with different phases at one time in the four sections of the CCD, which can achieve the real-time detection of the target and overcome the problems that the moving mirror scanning detection Mode can not detect the rapidly changing target defects.Because the beam is quadrisected, the intensity dropped significantly, the faint achromatic signal can be detected as the key to study.In this paper, the characteristics of the target gas chromatogram analysis The optical transmission characteristics and response characteristics of the static polarization wind imaging interferometer system, the noise level of the CCD and the signal to noise ratio of the system are obtained, and the conclusion is obtained that the weak signal night glow can not be detected in the conventional detection mode. , Pixel combination technology and the selection of high detection sensitivity of electron multiplying CCD and other measures, can effectively improve the signal to noise ratio, and calculate several measures after comprehensive use of the system’s signal to noise ratio and responsiveness. Considering the rapid changes in cost and target , Only using pixel binning technology, simulated signal-to-noise ratio and digitized output with the radiation intensity curve, the results show that the night can be achieved such as glow Detecting a weak signal.