Measuring Device for Measuring the Oxygen Fraction in Respiratory Air
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United States of America Patent
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Issued Date -
Jan 8, 2009
app pub date -
Dec 12, 2006
filing date -
Jan 28, 2006
priority date (Note) -
Abandoned
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Abstract
A measuring device for measuring the oxygen fraction in respiratory air, especially in aircraft, has an oxygen sensor to which an electrical, analog, sinusoidal input signal with a fixed base frequency is fed and which emits an electrical, analog output signal containing a useful signal component with a double-base frequency and at least one interference signal component with a base frequency, in addition to an evaluation circuit for determining a measured value as a measure of the oxygen fraction, the output signal being fed to the circuit. To improve measuring accuracy, while simultaneously reducing fluctuations in the measured values, the output signal and a sinusoidal reference signal with a base frequency are fed to an adder located between the oxygen sensor and evaluation circuit, the reference signal phase and amplitude being set such that the interference signal component is largely compensated for in the output signal of the adder.
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