| 摘要 |
A fluid flow indicator having (a) a vortex reaction responsive oscillatable member disposed within a conduit, for transmitting energy non-mechanically through the conduit wall to a responder located outside the conduit to provide a response that is a measure of the fluid flow. The non-mechanical transmission through the conduit wall may be by way of electromagnetic radiation caused for example: by a moving magnetic element producing a relatively moving magnetic field; or by radioactivity. The responder responds to electromagnetic radiation in the specific form employed, field disturbance or change by a moving magnetic member, or radioactivity, as the case may be.
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