通常情况下，雨滴传感器安装在挡风玻璃附近，并结合近红外光和硅光电二极管来检测雨滴。滨松提供可配置在雨滴传感器中的光学半导体器件，包括红外 LED 和硅光电二极管。
当挡风玻璃上没有雨滴时，从 LED 发出的红外光会从挡风玻璃表面反射出来，并撞击硅光电二极管。当挡风玻璃上出现雨滴时，硅光电二极管的红外光照射会减少，因为红外光必须穿过雨滴。此机理的原理是确定是否存在雨滴（水）。它还根据输入到硅光电二极管的光量来区分大雨和小雨，以便自动控制雨刷的速度。
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