ACTIVE TARGET DISTANCE MEASUREMENT
First Claim
1. A method of measuring distance to a target comprising reflecting a pulse off a target, retrieving energy from said reflected pulse over a predetermined gating period and measuring a level of said retrieved energy, determining a distance of said target by comparing said measured retrieved energy level from said target over said predetermined gating period with a calibration energy level.
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Accused Products
Abstract
Apparatus for determining a distance of a target, the apparatus comprising a pulse transmitter, a gatable beam detector, and a comparator, the gatable beam detector being operable to obtain gated and calibration beam energy information of a pulse transmitted by the beam pulse transmitter for reflection from the target, and to pass the beam energy information to the comparator, thereby to obtain a ratio between the gated and the calibration beam energy, the ratio being inversely proportional to the distance. Also an array thereof for simultaneously obtaining distances of a multiplicity of points of a three-dimensional object in real time, in particular to obtain movement information of the target.
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Citations
24 Claims
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1. A method of measuring distance to a target comprising
reflecting a pulse off a target, retrieving energy from said reflected pulse over a predetermined gating period and measuring a level of said retrieved energy, determining a distance of said target by comparing said measured retrieved energy level from said target over said predetermined gating period with a calibration energy level.
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14. Apparatus for determining a distance of a target, said apparatus comprising a pulse transmitter, a gatable beam detector, and a comparator, said gatable beam detector being operable to obtain gated and calibration beam energy information of a pulse transmitted by said beam pulse transmitter for reflection from said target, and to pass said beam energy information to said comparator, thereby to obtain a ratio between said gated and said calibration beam energy, said ratio being inversely proportional to said distance.
- 22. An array of distance sensors for sensing distance to multiple points of a target object by detecting pulses reflected off a target object, each sensor comprising a gatable detector for detecting incident energy levels of said pulses to produce an output indicative of the distance of a respective point.
Specification