Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1993-09-08
1995-02-21
Regan, Maura K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
345 95, 34087037, G01R 2726
Patent
active
053919920
ABSTRACT:
A measuring device for absolute measurement of positions is disclosed, which comprises a displacement sensor having a fixed element and a movable element which is relatively movable against the fixed element and being adapted to output a signal corresponding to the relative position of the movable element against the fixed element, demodulators for processing the output signal of the displacement sensor so as to obtain cyclic square signals for detecting at least two types of displacement of coarse scale and fine scale, each edge of the square signals having phase information, phase detectors for detecting phase information from each square signal obtained by the demodulators so as to obtain phase data of at least coarse scale and fine scale, a composing circuit for composing phase data of the coarse scale and fine scale obtained by the phase detectors so as to obtain an absolute displacement of the movable element against the fixed element, a display portion for displaying the absolute displacement obtained by the composing circuit at predetermined refresh cycles, and a control circuit having a timer for limiting the period of the operation of the demodulators and the phase detectors for sampling phase data.
REFERENCES:
patent: 3936815 (1976-02-01), Kogure et al.
patent: 4477805 (1984-10-01), Arton et al.
patent: 4676602 (1987-06-01), Watanabe
patent: 4748444 (1988-05-01), Arai
patent: 4777483 (1988-10-01), Fowler
patent: 4879508 (1989-11-01), Andermo
Mitutoyo Corporation
Regan Maura K.
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