Sensor arrays based on electronic oscillators
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United States of America Patent
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Sep 30, 2008
Grant Date -
Mar 30, 2006
app pub date -
Jun 30, 2005
filing date -
Jun 30, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensor array for measuring various parameters in a machine environment, the sensor array comprising a number of oscillators, each of the oscillators comprising a feedback network, an amplifier and a limiter being connected together in a loop. The feedback network has a frequency which varies with the parameters to be measured. The amplifier consumes a current from a current supply and in cooperation with the feedback network produces a signal that alternates at the natural frequency of the feedback network. The limiter limits the amplitude of the signal within a predetermined amplitude range. All of the signals from the oscillators are multiplexed onto the output of the sensor array. Frequency analysis may then used to isolate the individual readings from each of the oscillators.
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