Electricity: measuring and testing – Magnetic – Displacement
Patent
1993-09-17
1996-09-03
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
324226, 33366, G01B 714, G01P 1500, G01C 906
Patent
active
055527035
ABSTRACT:
An elongate vessel, preferably cylindrical, is partially filled with a conductive and/or ferromagnetic fluid. At least two coils are wound on the vessel in longitudinally different regions so that tilting the vessel varies the amount of the fluid inside the coils differently. This affects their inductances. The variation in inductances is monitored, directly or indirectly, e.g. by applying an AC signal to the coils and monitoring the voltage drops across them. This provides an electrical output related to the inclination of the sensor's axis. It is unaffected by rotation about the axis. Thus the sensor can be used to monitor the orientation of the axis of a drilling tool, e.g. a mole, which rotates about its axis.
REFERENCES:
patent: 3184861 (1965-05-01), Conrad
patent: 3839904 (1974-10-01), Stripling et al.
patent: 3984918 (1976-10-01), Chaney
patent: 4779353 (1988-10-01), Lopes et al.
Messtechnik, vol. 82, No. 1, Jan. 1974, Munchen De pp. 13-18, K. Eibl et al. `Das Differenzprinzip zur Linearisierung eines Induktiven Langenmessumformers mit Frequenzausgang`, pp. 13-14 (no translation).
Radiodetection Limited
Snow Walter E.
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