Linear direction sensor cameras for position measurement

• US 4,973,156 A
• Filed: 10/10/1989
• Issued: 11/27/1990
• Est. Priority Date: 10/10/1989
• Status: Expired due to Fees

• Current Assignee: Andrew Dainis
• Original Assignee: Andrew Dainis
• Inventors: Dainis, Andrew
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Wallace, Linda J.
• Application Number:
  US07/419,280
• Time in Patent Office: 413 Days
• Field of Search: 356/147, 356/1, 356/141, 356/153, 356/460, 250/203.1, 250/203.2, 250/203.3
• US Class Current: 356/141.5
• CPC Class Codes: G01S 3/783 using amplitude comparison of signals derived from static detectors or detector systems

Abstract

Three linear direction measurement sensors mounted adjacent to one another comprise a device for simultaneously measuring the directions of a plurality of optical targets. Four linear direction sensors distributed over at least two locations comprise a device for simultaneously measuring the three-dimensional positions of a plurality of optical targets.

Claims

1. A sensor system for measuring directions to a plurality of targets comprising:

a plurality of simultaneously illuminated optical targets whose directions are to be measured,

at least three linear direction sensors, each such sensor including;

an optical means having an axis whereby light received from said plurality of targets is formed into a pattern containing sufficient information to describe the orientation of every plane formed by one each of the targets and said axis,

a sensor means mounted in a manner to intercept light forming said pattern whereby features of said pattern are converted to electrical signals which describe said orientations of said planes,

a means for mounting said at least three linear direction sensors such that said axis of any one linear direction sensor is not parallel to said axis of any other linear direction sensor, and said axes mutually intersect in a common point, and

an ancillary computing means for receiving said electrical signals and calculating from said signals directions to said targets as indicated by mutual intersections of at least three planes, each plane derived from a different linear direction sensor.

2. A device according to claim 1 wherein each linear direction sensor comprises:

an optical lens system including cylindrical symmetry about a lens axis whereby light received from said plurality of targets is focused into a set of substantially parallel lines, each one of said lines lying substantially within a plane formed by said lens axis and one each of the targets;

a sensor means comprising a plurality of photosensitive elements arranged linearly along an image sensor axis wherein each one of said photosensitive elements converts light incident upon said element to a stored electrical charge;

a circuit means for converting said charges to electrical signals suitable for computer processing;

a means for supporting said lens system in a position to focus said light onto said photosensitive elements in a manner such that said lens axis forms a non-zero angle with said image sensor axis.

3. A device according to claim 1 wherein said means for mounting positions three linear direction sensors

with said axes of said optical means thereof lying within a common plane, intersecting in a common point, and forming mutual angles of 120 degrees.

4. A device according to claim 3 wherein each linear direction sensor comprises:

an optical lens system including cylindrical symmetry about a lens axis whereby light received from said plurality of targets is focused into a set of substantially parallel lines, each one of said lines lying substantially within a plane formed by said lens axis and one each of the targets;

a sensor means comprising a plurality of photosensitive elements arranged linearly along an image sensor axis wherein each one of said photosensitive elements converts light incident upon said element to a stored electrical charge;

a circuit means for converting said charges to electrical signals suitable for computer processing;

a means for supporting said lens system in a position to focus said light onto said photosensitive elements in a manner such that said lens axis forms a non-zero angle with said image sensor axis.

5. A sensor system for measuring locations of a plurality of targets comprising:

a plurality of simultaneously illuminated optical targets whose positions are to be measured,

a least four linear direction sensors, each such sensor including;

an optical means having an axis whereby light received from said plurality of targets is formed into a pattern containing information sufficient to quantify the orientation of every plane formed by one each of the targets and said axis,

a sensor means mounted in a manner to intercept light from said pattern and convert features of said pattern to electrical signals describing said orientations of said planes,

and means for mounting said at least four linear direction sensors such that at least one subset of four linear direction sensors of said at least four linear direction sensors fulfills the conditions that

the sensors are mounted at at least two locations spaced from each other, no two sensors have coincident axes, no two sensors at one location have parallel axes, and that at least two different axis orientations are demonstrated among said subset of four sensors, and

an ancillary means for receiving said electrical signals and computing positions of said targets as indicated by mutual intersections of at least four planes, each plane derived from a different linear direction sensor.

6. A device according to claim 5 wherein each linear direction sensor comprises:

an optical lens system including cylindrical symmetry about a lens axis whereby light received from said plurality of targets is focused into a set of substantially parallel lines, each one of said lines lying substantially within a plane formed by said lens axis and one each of the targets;

a sensor means comprising a plurality of photosensitive elements arranged linearly along an image sensor axis wherein each one of said photosensitive elements converts light incident upon said element to a stored electrical charge;

a circuit means for converting said charges to electrical signals suitable for computer processing;

a means for supporting said lens system in a position to focus said light onto said photosensitive elements in a manner such that said lens axis forms a non-zero angle with said image sensor axis.

7. A device according to claim 5 comprised of four linear direction sensors wherein said means for mounting holds the sensors at three spaced locations on a straight line with said axes of said optical means thereof contained with a common plane, and with two sensors mounted at separated locations with said axes thereof oriented perpendicularly to said line, and remaining two sensors mounted adjacent to one another at a location midway between the other two sensors and having axes thereof oriented 45 degrees from the end sensors and at 90 degrees with respect to each other.

8. A device according to claim 5 wherein each linear direction sensor comprises:

an optical lens system including cylindrical symmetry about a lens axis whereby light received from said plurality of targets is focused into a set of substantially parallel lines, each one of said lines lying substantially within a plane formed by said lens axis and one each of the targets;

a sensor means comprising a plurality of photosensitive elements arranged linearly along an image sensor axis wherein each one of said photosensitive elements converts light incident upon said element to a stored electrical charge;

a circuit means for converting said charges to electrical signals suitable for computer processing;

a means for supporting said lens system in a position to focus said light onto said photosensitive elements in a manner such that said lens axis forms a non-zero angle with said image sensor axis.