Low power tiltmeter electronics with compensation for bubble lev

Details Low power tiltmeter electronics with compensation for bubble lev Low power tiltmeter electronics with compensation for bubble lev

1991-01-28

1992-09-15

Cuchlinski, Jr., William A.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33379, 36457103, G01C 920

Patent

active

051466880

ABSTRACT:
Low power tiltmeter electronics with compensation for bubble level fluid temperature include compensating methods both for temperature-induced conductivity changes and temperature-induced viscosity changes in the bubble level fluid of a tiltmeter. The conductivity changes are compensated for by comparing the difference between the tilt conductances with the average of the tilt conductances. The viscosity changes are compensated for with a critically damped bandpass filter and a thermistor filter.

REFERENCES:
patent: 4028815 (1977-06-01), Buckley et al.
patent: 4099415 (1978-07-01), Hartzell
patent: 4715003 (1987-12-01), Keller et al.
patent: 4912662 (1990-03-01), Butler et al.

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