| 摘要 |
PURPOSE:To detect the position of generation of pollution gas throughout a wide range from the output of detection by laser beams by a method wherein the laser beams from a single source thereof are introduced, being changed over, into a plurality of photochannels intersecting each other crossways across a monitored area. CONSTITUTION:On the upper and left sides of the monitored area where a group of gas tanks 1-16 are situated are arranged corner cubes Cx1-Cx4 and Cy1-Cy4 whereby the channels X1-X4 and Y1-Y4 of reflected beams intersecting each other cross-ways across the area. Moreover, on the lower and right sides of the area are provided rails R, whereon a carrier 50 loaded with the source 20 of laser beams and a detector 30 is provided movably in a reciprocating manner. Accordingly, while the carrier 50 being moved on the rails R, the laser beams are emitted from the source 20 at every position facing each channel and the reflected beams are detected by the detector 30, whereby the density of the pollution gas can be monitored in a real time throughout a comparatively broad area. |
