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Detection of the presence or absence of a gas bubble by dynamic sensor response

  • US 8,354,015 B2
  • Filed: 12/01/2010
  • Issued: 01/15/2013
  • Est. Priority Date: 09/02/2004
  • Status: Active Grant
First Claim
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1. A method for detecting the presence or absence of a gas bubble in a liquid to be measured, where the gas bubble, if present, is in at least partial contact with a sensitive region of a sensor in a measuring chamber, the sensor for determining the concentration of a gaseous component dissolved in the liquid, the method comprising:

  • setting a gas partial pressure, which differs from an expected value of the gas partial pressure of the gaseous component in the liquid to be measured, at the sensor using a select one of;

    an aqueous liquid, a gas, and a mixture of gases containing the gaseous component to be determined in suitable concentration;

    exposing the sensor to the liquid to be measured;

    waiting until the liquid to be measured attains standstill;

    recording a signal from the sensor as a function of time until the signal becomes constant; and

    inferring the presence or absence of a gas bubble from a variation of the signal over time.

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