| 摘要 |
PURPOSE:To measure the concn. of floating dust remotely at a position to be easily influenced by a magnetic field by arranging a light source part, a measuring part and a photodetecting part separately connecting them through transmission lines consisting of optical fibers and filling a space between light emitting and photodetecting lenses with air. CONSTITUTION:The measuring device is constituted of a signal transmission part consisting of an optical fiber 3 connecting the light source part 1 to the measuring part 2, two signal transmission parts consisting of optical fibers 11, 12 connecting the measuring part 2 to the photodetecting part 4, a conversion processing part 5, and a display part 6. The measuring part 2 divides light obtained from the optical fiber 3 into two systems by a beam splitter 7, passes one light beam in air and the other beam in clean air surrounded by a cylindrical glass 10. Both the light beams are made incident upon optical fibers 11, 12 through microlenses 8 and ball lenses 9 and converted into electric signals by the photodetecting part 4. The relative concn. of floating dust in air is detected on the basis of the difference between both the signals and displayed on the display part 6. |
