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Proceedings Paper

Low-Cost Reflective Optical Switches Applied To Non-Contact Liquid Level Set-Point Control
Author(s): John N. Pike
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Paper Abstract

Commercial reflective optical switches, tilted strongly off-axis, can provide better than ±0.03 mm sensitivity in controlling the refill of a quiescent fluid container to some desired set-point level. The optics of this increased sensitivity is derived geometrically and a control sensor described and tested. Both set-point control sensitivity and sensor-surface working distance (inversely) are functions of tilt angle, so can be chosen or changed as required. Two such sensors, adjusted to give peak signals at two slightly different liquid levels (0.2 mm apart, e.g.), can then control not only a two-stage (fast/ slow) refill process but also provide high-sensitivity monitoring of any ripples or waves on the liquid surface after refill is complete.

Paper Details

Date Published: 17 February 1987
PDF: 8 pages
Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); doi: 10.1117/12.941702
Show Author Affiliations
John N. Pike, J.J. Pike & Co., Inc. (United States)

Published in SPIE Proceedings Vol. 0814:
Photomechanics and Speckle Metrology
Fu-Pen Chiang, Editor(s)

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