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Method and apparatus for measuring surface changes, in porous materials, using multiple differently-configured acoustic sensors

  • US 6,257,048 B1
  • Filed: 06/18/1999
  • Issued: 07/10/2001
  • Est. Priority Date: 06/22/1998
  • Status: Expired due to Fees
First Claim
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1. A method for measuring the mass of adsorbent in a porous material at various pressures, comprising:

  • a) providing first and second acoustic sensors, each having different operating characteristics to provide different responses to identical inputs such that contributions of mass and effective modulus of the material to the responses of the sensors are separated;

    b) applying identical material on a chosen surface of each of the first and second acoustic sensors, the applied material being the material to be measured;

    c) placing the first and second acoustic sensors in a measurement environment;

    d) providing adsorbent into the measurement environment at various pressures and measuring the responses of the first and second acoustic sensors at each pressure; and

    e) calculating the mass of adsorbent in the material based on the responses of the first and second acoustic sensors.

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