| 摘要 |
PURPOSE:To measure the wetness of vapor with high accuracy by dividing the light from a light source into two, leading one of them to an optical fiber for irradiating it to a detecting part, and leading the other to an photoelectric converting element. CONSTITUTION:To light sources 3, 3' and 3'', a power source is supplied successively through a controller 24 and a power source switching device 25 by a command from a signal operation processor 27, and its light is switched by an optical switch 23 which has synchronized with the switching device 25. This light is divided into two by an equal light quantity by a half mirror 50, and one of them is converted to an electric signal IO by a photodetector 51. The other is led to an optical fiber 6, becomes an incident light 5 to a wet vapor flow of a measuring space A, led to photodetectors 16, 12, as light 13 which is scattered by a water droplet in the space A and light 10 which is attenuated by the water droplet, by optical fibers 15, 11, respectively, converted to electric signals and fetched as a scattered light signal Is, and a transmission light signal Ir. These signals IO, Is and Ir are amplified 22, synchronized with a wavelength variation of the light source by the switching device 25, and the respective signals are identified and stored in a data store part of the device 27. |
