| 摘要 |
The disinfection of water or other fluid is accomplished by passing a stream of the fluid through a laser beam which radiates light in the ultraviolet range. A gas pulsed laser is disclosed which produces a beam having a substantial width and depth and a measurable length, as measured in the direction of fluid flow. The laser is positioned out of contact with the stream but with its beam filling the cross-section of the stream of water which can flow through a flume or over a weir. Flow meters are provided which adjust the rate of pulsing of the laser, and therefore the intensity of the ultraviolet light, in relation to changes in flow. Sensors are also provided to adjust the intensity of the laser for changes in turbidity or organic content of the fluid. In one embodiment the fluid flows through a spiral tube which directs the fluid to and fro through the laser beam. In another embodiment, the length of the laser beam is adjusted by adjusting the distance between the laser beam source and a diverging lens. The laser beam may be reflected off of mirrored surfaces, and utilizes the scattering of the ultra-violet light produced by suspended particles in the fluid being treated.
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