新型双光路镜面露点仪设计

Design of Dew-point Hygrometer with Double Optical Routes

设计出双光路的露点测量仪,测量光经分光后,一路直接被光电管接收,作为参考信号,能够对光强自动进行温度补偿;另一路经镜面反射和散射后被光电管接收,使反射光和散射光线都可以聚焦于测量,不浪费光线,光信号经光电转换及放大后控制制冷器制冷,使气体中的水蒸气在镜面上冷凝并达到相平衡状态,通过测温电路测出露层温度。同时合理选择各个部分的材料和元器件并设计出高精度的硬件电路及控制系统。通过实验验证,仪表可以快速稳定,测量精度大大提高。

A dew point hygrometer with double optical path was designed. Through the beam splitter,one of the measuring light roads was directly received by the photoelectric tube as the reference signal,and can automatically compensate temperature of the light intensity; the other path in the mirror was received by photoelectric cell after specular reflection and refraction,so all lights can be focused on the measurement without waste. The light signal was conversed by the photoelectric circuit,and then controlled the refrigerator after enlarged. When the gases get condensation equilibrium,dew point temperature was measured by temperature measurement circuit. We selected reasonable materials and components and designed the hardware circuit and control system with high accuracy. Through experimental verification,the instrument can be rapid and stable,and the measurement accuracy is improved.