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Microfluidic devices and methods based on measurements of electrical admittance

  • US 7,250,775 B1
  • Filed: 11/12/2004
  • Issued: 07/31/2007
  • Est. Priority Date: 11/12/2003
  • Status: Active Grant
First Claim
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1. A method of measuring the flow rate of a conducting fluid in a microchannel, comprising:

  • a) applying a voltage across a pair of electrodes placed in the microchannel;

    b) determining the current flowing across the electrodes;

    c) comparing the current determined in Step B to a base current with no flow between the electrodes; and

    d) determining the flow-induced electrical admittance at different frequencies by calculating the change in flow rate as a function of the change in current.

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