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Passive and wireless in-vivo acoustic wave flow sensor

  • US 20050240110A1
  • Filed: 04/21/2004
  • Published: 10/27/2005
  • Est. Priority Date: 04/21/2004
  • Status: Active Grant
First Claim
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1. A fluid flow sensing system, comprising:

  • a surface acoustic wave flow sensor for monitoring a flow of fluid through a compartment formed from a plurality of walls, wherein said surface acoustic wave flow sensor comprises at least one interdigital transducer and a self-heating heater formed upon a piezoelectric substrate, wherein said interdigital transducer is selected to introduce negligible electrical coupling to surface waves thereof; and

    an antenna connected to said at least one interdigital transducer, wherein said antenna receives at least one signal, which excites said at least one interdigital transducer to produce a frequency output associated with said flow of said fluid for analysis thereof.

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