High sensitivity single or multi sensor interface circuit with constant voltage operation
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United States of America Patent
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Nov 27, 2007
Grant Date -
N/A
app pub date -
Jun 27, 2006
filing date -
Nov 7, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensor interface circuit is provided to interface many sensors simultaneously in a simple circuit arrangement consisting of two parts. Sensors in both parts operate under identical constant voltage. The circuit provides higher front end sensitivity than the Wheatstone bridge, with temperature compensation from all sensors. The circuit also can provide output zeroing to obtain high resolution measurements. The invention can be used as a unique constant voltage anemometer with auto zeroing, and with much higher sensitivity than related devices. Further, in the constant voltage anemometer embodiment, the time constant and the overheat of the hot-wire/hot-film can be measured in true in situ mode under actual test conditions. In another embodiment, the circuit can be used to measure dynamic capacitance from capacitance sensors, without any effect of associated cable capacitance.
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