Displacement detecting apparatus

Details Displacement detecting apparatus Displacement detecting apparatus

1991-07-25

1993-03-16

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 285, 342125, G01C 308, G01S 1308

Patent

active

051949075

ABSTRACT:
A measured displacement is determined by extracting components proportional to a sine value and cosine value of the displacement from a phase modulated wave in synchronization with a reference wave. A response delay which tends to occur in a PLL circuit due to the variations of the reference wave is not generated. The detecting resolution is determined depending upon that of the A/D convertor. Generally, the higher the resolution of the A/D converter the lower the speed at which the converter operates. However, since the upper digit is obtained by counter, it is possible to engage the low speed A/D converter even if the measured displacement varies at a high speed. For this reason, it is possible to easily detect the measured displacement at a high resolution.

REFERENCES:
patent: 4241995 (1980-12-01), Takahama
patent: 4443107 (1984-04-01), Alexauder et al.
patent: 4715706 (1987-12-01), Wang

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