Weighing system with a moire optoelectronic transducer

Details Weighing system with a moire optoelectronic transducer Weighing system with a moire optoelectronic transducer

G - Physics

01

G

265/24, 265/50

G01G 23/36 (2006.01) G01G 23/32 (2006.01)

Patent

CA 1053270

WEIGHING SYSTEM WITH A MOIRE OPTOELECTRONIC TRANSDUCER Abstract of the Disclosure A weighing scale includes an optoelectronic system having apparatus for generating a moire fringe pattern and for detecting the moving of the pattern in accordance with scale tare deflection. One of a pair of ruled parallel grating sets is fixed with respect to the scale frame while the other is mounted for movement with the tare and close to and in a plane parallel with the fixed set. when a beam of light is projected through both grating sets in a trans- missive mode towards a photodetector array the grating interference modulates the light beam into parallel moire fringes. Upon placement of a load on the scale, deflection of the tare results in movement of successive fringes across the photodetectors resulting in the sequential generation of weight indicative signals. The photodetectors are arrayed on and secured to a movable carrier which is adjustably positionable so that the effective spacings between the photodetectors corresponds to the spacings and proper phase angle required between said fringes.

269018

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