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本文对热释电探测器(TGS)在 CO_2激光大气通信三路机中的频域展宽问题进行了分析计算,提出了具体措施和实验的结果,在所用的系统中 TGS 频域可展宽到2×10~4Hz,获得了满意的效果。其次对热探测器前置放大器噪声作了分析计算,并证明了源跟随器的 FET 电流噪声是限制系统信噪比的主要因素,最后还分析了大气湍流对 TGS 探测器工作的影响及改进办法,还肯定了 LiTaO_3使用的优越性。Ⅰ.热释电探测器响应频城的展宽Ⅱ.热释电探测器前置放大电路中各种噪声的计算Ⅲ.关于 TGS 光敏面的选择Ⅳ.大气湍流对探测器的影响Ⅴ.其它热释电探测器在三路机中的使用和比较
This paper analyzes and calculates the frequency domain broadening problem of pyroelectric detector (TGS) in CO_2 laser atmosphere communication tri-machine, and puts forward the concrete measures and experimental results. In the system used, the TGS frequency domain can be broadened to 2 × 10 ~ 4Hz, obtained the satisfactory result. Secondly, the heat detector preamplifier noise is analyzed and calculated, and it is proved that the source follower FET current noise is the main factor to limit the system signal to noise ratio. Finally, the influence of atmospheric turbulence on the TGS detector work and the improved method , But also affirmed the superiority of LiTaO_3 usage. Ⅰ. Pyroelectric detector responds to the broadening of the frequency band Ⅱ. Calculation of various noises in pyroelectric detector preamplifier circuit Ⅲ. Selection of TGS photosensitive surface Ⅳ. Effect of atmospheric turbulence on detector Ⅴ. Other heat Use and comparison of power detector in three road machine