| 摘要 |
A noncontacting vortex-generating sensor apparatus for detecting and indicating the presence of an object in the path of a stream of fluid and for providing an indication of the distance of said object from the nozzle emitting said stream of fluid. The apparatus comprises a cylindrical vortex-generating chamber, a supply port for introducing fluid into the vortex chamber, a vortex outlet port communicating with a central portion of the vortex chamber for permitting the fluid to be exhausted therefrom, nozzle means for issuing or emitting the exhausted fluid as a stream, and a sensing port by means of which the pressure within the central portion of the vortex chamber is sensed.
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