Optical displacement measuring system with nonlinearity correcti

Details Optical displacement measuring system with nonlinearity correcti Optical displacement measuring system with nonlinearity correcti

1986-11-12

1988-08-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356 1, 356 4, G01J 120, G01C 300

Patent

active

047615460

ABSTRACT:
An optical displacement measuring system utilizing a triangulation is so arranged that light receiving means receives light reflected back from an object to be measured and generates a pair of output signals having mutually opposite values and responsive to a position of a light spot on the light receiving means. An operational means performs addition and subtraction over the pair of positional output signals and to obtain a ratio between the both added and subtracted output signals for generating a measured distance signal, and a linearity correcting means provides a mathematical correction number to one of the pair of positional output signals to correct any nonlinearity of the measured distance signal, for providing the linearity to the measured distance signal with a simple arrangement.

REFERENCES:
patent: 3612890 (1971-10-01), Cornyn, Jr. et al.
patent: 3885872 (1975-05-01), Howe, Jr. et al.
patent: 3937574 (1976-02-01), Peckham et al.
patent: 4445029 (1984-04-01), Nagaoka et al.
patent: 4464053 (1984-08-01), Bodlaj
patent: 4621917 (1986-11-01), Kaneda
patent: 4673274 (1987-06-01), Nagaoka et al.

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