Downhole quartz gauge with minimal electronics
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United States of America Patent
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-
Nov 29, 2016
Grant Date -
Oct 23, 2014
app pub date -
Mar 13, 2014
filing date -
Mar 14, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and method of monitoring a pressure, temperature, and/or vibration of a hostile environment without requiring the use of active electronics or an oscillator circuit in that environment. The system and method interrogate a resonant pressure sensor and a resonant or passive temperature sensor connected to a transmission line and located at least 100 feet (30.48 m) away from a network analyzer. The system and method use the reflected frequencies from the sensors to determine the pressure, temperature, and/or vibration. If the sensors are networked by the transmission line or a network filter, the reflected portion can include the reflected transmission energy. The applied signal and reflected portion travel along the transmission line, which is preferably impedance matched to that of the system. If a multi-conductor cable is used, the effects of the cable's length and temperature are compensated for via a system calibration when in field use.
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