Optical detector which compensates for nonlinearities in a weigh

Details Optical detector which compensates for nonlinearities in a weigh Optical detector which compensates for nonlinearities in a weigh

1977-09-26

1978-12-12

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

177DIG6, G01G 314

Patent

active

041291913

ABSTRACT:
An optical detector for a weight measuring system senses the relative movement between a frame and a load support of a scale assembly. The detector includes a transducer subassembly which carries a plurality of photodetectors positioned at the end of a light path which is modulated by a pair of optical gratings. One of the gratings is fixed relative to the scale frame, and the other is mounted to the load support assembly in alignment with the fixed grating. Placement of a load upon the scale deflects the load support to provide an optical signal including a cyclic pattern of light to dark transitions which is detected by the photodetectors. Optical compensation for nonlinearities in scale load support deflection which are inherent with the scale assembly is provided by generating an optical signal which indicates displacement different from the vertical component of deflection. Such compensation is provided by establishing a predetermined grating angle relative to a horizontal plane.

REFERENCES:
patent: 3913095 (1975-10-01), Dlugos
patent: 3923110 (1975-12-01), Dan
patent: 3980147 (1976-09-01), VAN DER Schoot
patent: 4044847 (1977-08-01), Wu
patent: 4047585 (1977-09-01), Dlugos
patent: 4047586 (1977-09-01), Dlugos
Terms and Definitions for the Weighing Industry, p. 84, prepared by Terminology Committee of the Scale Manufacturers Association, Inc. 1958.

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