Title:
DISPLACEMENT SENSING SYSTEM
Document Type and Number:
WIPO Patent Application WO2001079887
Kind Code:
A3
Abstract:
A displacement sensing system (20) including an oscillator circuit (22) having a characteristic frequency which varies as a function of a magnetic field in the vicinity thereof, an element (24) whose position relative to the oscillator circuit (22) is varied by a displacement, the element (24) being operative to vary the magnetic field in the vicinity of the oscillator circuit (22) as afunction of the displacement and circuitry for sensing a change of frequency of the oscillator circuit (22) over time (delta f/delta t) and for providing an output indication when the change in frequency of the oscillator circuit (22) over time exceeds a threshold.
Inventors:
MOLDAVSKY MARK (IL)
ZHEVELEV BORIS (IL)
ZHEVELEV BORIS (IL)
Application Number:
PCT/IL2001/000357
Publication Date:
January 24, 2002
Filing Date:
April 18, 2001
Export Citation:
Assignee:
VISONIC LTD (IL)
MOLDAVSKY MARK (IL)
ZHEVELEV BORIS (IL)
MOLDAVSKY MARK (IL)
ZHEVELEV BORIS (IL)
International Classes:
G01V3/08; G08C19/16; (IPC1-7): G08C19/16; G08C19/20; G08B13/14; G08B13/24
Foreign References:
| US5576693A | 1996-11-19 | |||
| US5227667A | 1993-07-13 | |||
| US4123749A | 1978-10-31 | |||
| US5552778A | 1996-09-03 | |||
| US3618059A | 1971-11-02 | |||
| US4584571A | 1986-04-22 |
Other References:
See also references of EP 1290475A4
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