Method of and apparatus for detecting malfunction of displacemen

Details Method of and apparatus for detecting malfunction of displacemen Method of and apparatus for detecting malfunction of displacemen

1998-08-03

2000-09-19

Strecker, Gerard

Electricity: measuring and testing

Magnetic

Displacement

32420712, 32420719, 324537, 73862331, 702116, G01B 714, G01B 700, G01L 114, G01L 2500

Patent

active

061217697

ABSTRACT:
Displacement detector includes a displaceable core, two detecting coils variable in their inductance in response to displacement of the core, and two reference resistances each connected in series with the corresponding detecting coil. Pulse power is supplied to each pair of the series-connected detecting coil and reference resistance, and two transient response voltages across the reference resistances are taken out. Two bottom holding circuits are also provided in corresponding relation to transient response voltages, so that each of the bottom holding circuits detects and holds a smallest or bottom level of the corresponding transient response voltage and thereby provides the bottom voltage as an output voltage. Then, a difference is evaluated between the two output voltages from the bottom holding circuits. When the difference between the two output voltages is below a predetermined value, the displacement detector is determined as malfunctioning due to a short-circuit state between the transient response voltages.

REFERENCES:
patent: 4735271 (1988-04-01), Shimizu
patent: 5223830 (1993-06-01), Romes
patent: 5712563 (1998-01-01), Kawagoe et al.
patent: 5721487 (1998-02-01), Milosevic
patent: 5777468 (1998-07-01), Maher

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