The optical system null communication territory for flow

摘要

Ideal execution example of this invention, being the optical system for flow sight meter, has with the flow channel which possesses the communication territory and the illuminant which is irradiated to the flow channel inside the aforementioned communication territory from direction of specification. This optical system ideally, has with the lens system and the detection system. The lens system is arranged, ideally, paralleling to the surface which crosses in the aforementioned flow channel, collects the light from the aforementioned communication territory and possesses the plural lens surfaces which are made parallel. The aforementioned detection system, as detected the light from the aforementioned lens system, has the plural detectors which are formed. Each detector has the local filter which the filter makes the wave length of specification ideal, individually. Because of this, as for the user hardening the filter simply in various orders, it can obtain the same detection parameter. Selective figure Figure 1