Optical distance measuring apparatus having a measurement error

Details Optical distance measuring apparatus having a measurement error Optical distance measuring apparatus having a measurement error

1989-03-15

1991-03-26

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354403, G01C 308

Patent

active

050023888

ABSTRACT:
An optical distance measuring apparatus having measurement error compensating function for compensating the measurement error due to electromagnetic induction noise which would lower the accuracy in distance measurement. According to the optical distance measuring apparatus of the present invention, the distance from the apparatus to the target is given by the difference in optical path between an "external optical path" to a corner-cube prism, i.e. the external target, and an "internal reference optical path". The measurement error can be cancelled by the periodicity of the measurement error curve and the predetermined length of the optical path extension means. Thus the measurement error can be compensated for and therefore a measured distance value free of measurement error can be obtained from the distance measuring apparatus.

REFERENCES:
patent: 3619058 (1971-11-01), Hewlett
patent: 3740141 (1973-06-01), DeWitt
patent: 3778159 (1973-12-01), Hines et al.
patent: 4560271 (1985-12-01), Fumio

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