大家很少有懂日文的，只看图连你的装置是干啥用的都猜不到，还怎么能讨论问题？
根据你的说明书内容来看，估计sensor前面那个用的会是柱透镜，更具体的就不好说了
附部分E文翻译：
SD Particle Inspection system was developed by Eisai in 1976.
Solution within the container keeps rotating for some time with force of habit when container is stopped after high speed spin rotation. Under this condition, light-beam is applied to container and reaches to sensor. As solution moves, foreign particle moves blocking off the light beam. This results in the variation in light intensity that sensor receives. This change in intensity is converted into electric signal for particle inspection.
SD Inspection system is not affected by flaw/dirt, characteristics of solution and printing on container wall and provides high detection rate of particle inspection with highest reliability. Over 800 units of Automatic Inspection Machines with SD Particle Inspection System have been delivered to 48 countries in the world.
