Apparatus and method for measuring displacement
US5970432A · kind A · utility
26Cited by
9References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 3, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Sep 3, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24409
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In apparatus and method for measuring a displacement of an object to be measured, a magnitude of the displacement is derived on the basis of a difference in periods of a phase modulated signal and a reference signal, a ratio between the periods of a basic clock and of an interpolation clock which is varied according to the magnitude of the displacement, a clock signal whose period is a multiplication of a period of the basic clock by the ratio as a multiplier, a pulse train signal is created whose number of pulses are given by the magnitude of the displacement and supplied to an A/B phase converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.