基于光散射原理的雨量传感器灵敏度的研究

Research on the Sensitivity of Rain Sensor Based on the Principle of Light Scattering

针对目前常用机械式雨量计存在的自身缺陷以及光学雨量计灵敏度较低等问题,提出了提高基于光散射原理的雨量计灵敏度的方法。通过分析散射理论基础,建立了散射光强、散射角度与体积的函数关系,并且仿真了其函数关系,根据仿真结果进行实验验证,研究不同波长以及不同角度对散射信号的影响。实验结果表明在偏移入射光方向的45°~50°之间放置光电探测器及光源选择650 nm波段的单色红色激光,能够有效提高传感器的灵敏度,该实验结果与理论分析基本一致。

According to the problems of common mechanical rain gauges and the low sensitivity of optical rain gauges,a method to improve the sensitivity of rain gauges is proposed based on the principle of light scattering.By analyzing the theoretical basis of scattering,the relationship between scattered light intensity,scattering angle and total rain volume is established and simulated,and experimental verification is carried out according to the simulation results to study the effect of different wavelengths and different angles on the effect of the scattered signal.The experimental results show that placing a photodetector between 45°-50°shifted from the direction of the incident light and selecting a monochromatic red laser with a wavelength of 650 nm as the light source can effectively improve the sensitivity of the sensor.And the experimental results are in accordance with the theoretical analysis.