| 摘要 |
PURPOSE:To obtain the titled sensor having a high discriminating capacity and less foreign noise by constituting of plural light detectors or a light detector having plural detecting faces as its signal light detector. CONSTITUTION:The light emitted from a light source 12 is converted to the beam of light having a certain widening angle phi by a beam of light adjusting means 13 and is made incident on an optical prism 11. The incident beam of light is emitted from the prism 11 with repeated reflections by a detecting face (a) and the face (b) which is parallel thereto and is made incident on plural light detectors or light detectors 14, 15, 16 having plural detecting faces. If the positions of these light detectors 14, 15, 16 are arranged properly the beam of light detected by respective light detector is made to correspond with the beam of light having different plural angles of incidence, and if respective electrical output signal is amplified by plural amplifiers 17, 18, 19..., outputted as output signals V1, V2, V3... and compared with combining the output signal V1, V2, V3..., it is usable for a sensor, etc. detecting the sort of liquid having approaching refractive index. |
