G - Physics
01
J
340/136.3
G01J 3/36 (2006.01) G01D 5/38 (2006.01)
Patent
CA 1278069
ABSTRACT OPTICAL SENSOR A moire fringe displacement sensor includes first and second gratings (3) (4), a polychromatic light source (1) illuminating the gratings, and a detector (8). The gratings are disposed such that a relative displacement of the first and second gratings causes a variation in the colour of the light reaching the detector. The detector (8) comprises first ant second photo-responsive elements (11) (12), the responsivity with respect to wavelength of the first element (11) being different from that of the second (12). Signals from the photo-responsive elements are fed to a micro-processor (15) which calculates the colour of the light incident on the detector as represented by two or more parameters on the Chromaticity (CIE) Diagram, and interprets the colour in terms of the displacement of the first and second gratings.
561513
Kirby Eades Gale Baker
University Of Liverpool (the)
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