Moire fringe apparatus for measuring small movements
First Claim
1. A DEVICE FOR MEASURING THE DISPLACEMENT OF A MOVABLE MEMBER WITH RESPECT TO A FIXED POINT COMPRISING A RASTED COUPLED TO SAID MOVABLE MEMBER, SAID RASTER HAVING A PLURALITY OF PARALLEL SPACED LINES DEFINING OPAQUE AND TRANSPARENT AREAS WHICH ARE ORIENTED SUBSTANTIALLY PERPENDICULAR TO THE DIRECTION OF MOVEMENT OF THE MOVABLE MEMBER, MEANS TO PROJECT A LIGHT BEAM AT A GIVEN AREA CONSTITUTING A PORTION LESS THAN A WHOLE OF THE RASTER, OPTICAL MEANS FOR PRODUCING A PLURALITY OF PHASE-DISPLACED IMAGES OF SAID RASTER PORTION MOVING IN DIRECTIONS OTHER THAN THE DIRECTION OF MOVEMENT OF THE RASTER AT THE RASTER, REFLECTOR MEANS POSITIONED TO INTERCEPT SAID IMAGES AND RETURN SAID PHASE DISPLACED RASTER IMAGES PORTIONS BACK THROUGH SAID OPTICAL MEANS TO BE COINCIDENT WITH SAID
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1 Claim
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1. A DEVICE FOR MEASURING THE DISPLACEMENT OF A MOVABLE MEMBER WITH RESPECT TO A FIXED POINT COMPRISING A RASTED COUPLED TO SAID MOVABLE MEMBER, SAID RASTER HAVING A PLURALITY OF PARALLEL SPACED LINES DEFINING OPAQUE AND TRANSPARENT AREAS WHICH ARE ORIENTED SUBSTANTIALLY PERPENDICULAR TO THE DIRECTION OF MOVEMENT OF THE MOVABLE MEMBER, MEANS TO PROJECT A LIGHT BEAM AT A GIVEN AREA CONSTITUTING A PORTION LESS THAN A WHOLE OF THE RASTER, OPTICAL MEANS FOR PRODUCING A PLURALITY OF PHASE-DISPLACED IMAGES OF SAID RASTER PORTION MOVING IN DIRECTIONS OTHER THAN THE DIRECTION OF MOVEMENT OF THE RASTER AT THE RASTER, REFLECTOR MEANS POSITIONED TO INTERCEPT SAID IMAGES AND RETURN SAID PHASE DISPLACED RASTER IMAGES PORTIONS BACK THROUGH SAID OPTICAL MEANS TO BE COINCIDENT WITH SAID
Specification
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Current AssigneeDe Lang Hendrik
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Original AssigneeDe Lang Hendrik
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InventorsDE LANG HENDRIK
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Application NumberUS04/226,773Time in Patent Office1,296 DaysField of SearchUS Class Current356/619CPC Class CodesG01B 21/065 for stretchable materialsG01D 5/38 by diffraction gratings
