Optical height detector with coaxial irradiation and image axes

Details Optical height detector with coaxial irradiation and image axes Optical height detector with coaxial irradiation and image axes

1994-04-29

1996-04-30

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

25055922, 356 405, G01N 2186, G01B 1130

Patent

active

055127606

ABSTRACT:
The height of a surface (25) along an axis (4) is determined by measuring the axial position of an irradiated spot (31) formed on the surface at the intersection of the surface and the axis. Radiation reflected by the surface and collected by a lens (8) forms an image spot (32) on the axis (4). The position of the image spot is determined by measuring the intensity of the radiation at at least three positions along the axis by means of a detection unit (35). The output signals (44, 44') of the detection unit are processed in an electronic means (43) for determining the position of the highest radiation intensity and for supplying a signal (43') whose magnitude represents the axial position of the image spot (32), hence, of the irradiated spot (31 ).

REFERENCES:
patent: 4567362 (1986-01-01), Kunz
patent: 4715708 (1987-12-01), Ito
patent: 4782239 (1988-11-01), Hirose et al.
patent: 5179287 (1993-01-01), Kitajima et al.
"Optical Surface Microtopography Measurement and/or Automatic Focusing" IBM Technical Disclosure Bulletin, vol. 15, No. 2, Jul. 1972, pp. 504-505.
Sensors and Actuators A, vol. A31, No. 1/3, 1992, Lausanne CH pp. 68-74 Butler et al `novel non contact sensor for surface topography measurement using a fibre optic principle`.
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