Optoelectronic displacement sensor with correction filter

Details Optoelectronic displacement sensor with correction filter Optoelectronic displacement sensor with correction filter

1987-08-27

1989-03-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250211K, 250205, 350314, G01D 534

Patent

active

048126357

ABSTRACT:
An optoelectronic displacement sensor for the absolute measurement of displacement in the sub-micrometer range is described, which is constructed, according to an exemplary embodiment, with a light-emitting diode (L) as light source and two photodiodes (D1, D2), which are arranged in a difference circuit and which are opposite to one another, as radiation sensors. The sensing of displacement takes place by means of a diaphragm (2), which is displaceable between light source and radiation sensors and which influences the illumination received by of the photodiodes (D1, D2). For the homogenization of the illumination, special means are provided, which, according to an exemplary embodiment, consist of a correction filter (6) disposed in the beam path.

REFERENCES:
patent: 3676129 (1972-07-01), Ragland, Jr.
patent: 3857032 (1974-12-01), Van Englehoven
patent: 3892961 (1975-07-01), Bachmann
patent: 4109147 (1978-08-01), Heske
patent: 4273526 (1981-06-01), Perrelli
patent: 4275505 (1981-06-01), Delmas
patent: 4564893 (1986-01-01), Myrman

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