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Fluid flow sensor, method and system

  • US 20050154345A1
  • Filed: 01/13/2004
  • Published: 07/14/2005
  • Est. Priority Date: 01/13/2004
  • Status: Active Grant
First Claim
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1. A flow sensor comprising:

  • a light emitter;

    a light detector; and

    a member placed in a flow path between the emitter and the detector, the member opening upon flow through the flow path such that light from the emitter is detected by the detector, the member closing upon a low pressure condition in the flow path such that not as much light from the emitter is detected by the detector.

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