Sensor for determining the angular position of a radiating point source in two dimensions
First Claim
1. A sensor for determining the angular position of a radiating point source in two dimensions, comprising:
- a) a point source of light located in a prescribed space;
b) a one-dimensional light detector comprising a single linear row or column of active elements adjacent said space;
c) a two dimensional mask interposed between said detector and said space, said mask having a two dimensional pseudo-random surface pattern defining a prescribed degree of transmissivity, said surface pattern comprising a plurality of V-shapes, at least some of said V-shapes overlapping one another, non-overlapping portions of said pattern having a first degree of transmissivity and overlapping portions of said pattern having a second degree of transmissivity;
d) whereby light from said source travels through said mask and onto said detector, said surface pattern causing said detector to sense two correlation signal peaks usable to indicate incident angle between said source and detector in two dimensions.
3 Assignments
0 Petitions
Accused Products
Abstract
Embodiments of a device and a technique are disclosed for locating the angular position of a radiating point source with respect to a detector comprising a point source of radiation, a variable transmissivity mask with pseudo-random variations, a multi-element detector and computing means for interpreting the detected image. The mask pattern, when illuminated by a point source of radiation, casts an image on the detector array. Computing means determine the pattern shift to allow determination of point source angular location in two dimensions. The mask transmissivity pattern and corresponding image vary in two dimensions, in such a manner as to yield two correlation peaks that indicate the incident angle in two dimensions. The differential shift and common mode shift in correlation peaks indicate the respective angles of incidence, allowing determination of the angular position of the light source.
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Citations
18 Claims
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1. A sensor for determining the angular position of a radiating point source in two dimensions, comprising:
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a) a point source of light located in a prescribed space; b) a one-dimensional light detector comprising a single linear row or column of active elements adjacent said space; c) a two dimensional mask interposed between said detector and said space, said mask having a two dimensional pseudo-random surface pattern defining a prescribed degree of transmissivity, said surface pattern comprising a plurality of V-shapes, at least some of said V-shapes overlapping one another, non-overlapping portions of said pattern having a first degree of transmissivity and overlapping portions of said pattern having a second degree of transmissivity; d) whereby light from said source travels through said mask and onto said detector, said surface pattern causing said detector to sense two correlation signal peaks usable to indicate incident angle between said source and detector in two dimensions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A sensor for determining the angular position of a radiating point source in two dimensions, comprising:
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a) a point source of light located in a prescribed space; b) a one-dimensional light detector adjacent said space; c) a two dimensional rectangular mask interposed between said detector and said space, said mask having a two dimensional pseudo-random surface pattern defining a prescribed degree of transmissivity, said surface pattern comprising a plurality of V shapes at least some of which partially overlap one another, non-overlapning portions of said pattern having a first degree of transmissivity and overlapping portions of said pattern having a second degree of transmissivity; d) whereby light from said source travels through said mask and onto said detector, said surface pattern causing said detector to sense two correlation signal peaks usable to indicate incident angle between said source and detector in two dimensions. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification