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鉴于传统气室结构检测灵敏度较低的问题,设计了一种椭球体反射镜气室结构,建立了椭球反射镜的数学模型,给出了其结构参数与探测器接收光强之间的关系表达式。为了获得最大的接收光强,优化了椭球镜结构尺寸。当探测头直径为2cm时,所优化的椭球镜长轴为16cm,焦距14.96cm。实验结果表明,该光路结构可使探测器输出信号幅度提高约1.7倍,这将有利于后级电路的信号放大、数模转换等处理过程,从而提高气体浓度检测的灵敏度和精度。
In view of the low detection sensitivity of the conventional gas cell structure, a gas cell structure of an ellipsoidal reflector is designed and a mathematical model of the ellipsoidal reflector is established. The relationship between the structural parameters and the received light intensity of the detector is given expression. In order to obtain the maximum received light intensity, the size of the ellipsoid mirror structure is optimized. When the probe diameter is 2cm, the optimized elliptical mirror has a long axis of 16cm and a focal length of 14.96cm. Experimental results show that the optical path structure can increase the amplitude of the detector output signal by about 1.7 times, which is beneficial to signal amplification, digital-to-analog conversion and other processing of the subsequent circuit, thereby improving the sensitivity and accuracy of the gas concentration detection.