Method and apparatus for measuring the displacement of an automa

Details Method and apparatus for measuring the displacement of an automa Method and apparatus for measuring the displacement of an automa

1990-06-25

1992-01-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

G01N 2186

Patent

active

050794329

ABSTRACT:
In a head displacement measuring apparatus, a folded optical path is used to introduce a collimated beam of light from a light source to a split photo detector, wherein both the light source and the split photo detector are mounted external of the support housing which secures and supports the flexible head assembly. A pair of optical prisms direct the light beam parallel to a head supporting blade integral with the head assembly. A Fresnel lens secured to the blade, preferably at the head end, varies the position of the path of the light beam in response to lateral displacement of the blade and head, to likewise vary the extent that the beam impinges one or the other of the photo detectors. The difference of the signals from the split photo detector provides a precise measurement of the transverse displacement of the head from a nominal centered position.

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patent: 4493212 (1985-01-01), Nelson
patent: 4626680 (1986-12-01), Martens et al.
patent: 4935621 (1990-06-01), Pikulski

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