Sensor apparatus

Details Sensor apparatus Sensor apparatus

2007-11-27

2007-11-27

Williams, Hezron (Department: 2856)

Measuring and testing

Gas analysis

By vibration

C073S579000, C073SDIG010, C073S024010

Reexamination Certificate

active

10240134

ABSTRACT:
A measurement head particularly for borehole use can measure multiple parameters with no electronics in the head and only a single conductor cable. Double-ended tuning forks (26, 28and38, 40) in the head are arranged to respond to different parameters such as temperature and pressure by adjusting their resonant frequencies. A drive signal on the conductor (50) is applied to transducers (30, 32, 42, 44) on all the tuning forks and those whose instantaneous resonant frequency is close will resonate. The signal is removed and the transducers return a decaying signal at the resonant frequency along the conductor. Other drive frequencies are tried, to locate the other sensors whose frequency ranges are separate.

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