G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 17/32 (2006.01) G01S 7/48 (2006.01) G01S 7/481 (2006.01)
Patent
CA 2121902
2121902 9311448 PCTABS00022 A laser diode distance measurement device includes a laser diode (10) which emits light (20) to a lens (22) which provides focussed light (24) incident on a target (26). The light (24) is reflected from the target (26) back to the laser diode (10) which causes the laser diode (10) to emit a light (28) which exhibits intensity pulses (due to coherent interference) related to the distance (L) to the target (26). A photodetector (30) provides a feedback signal indicative of the intensity of the light (28) to a distance measurement circuit (18). The laser diode (10) is driven by an up-ramp signal that reduces electronic processing and at a frequency that reduces speckle noise. The distance measurement circuit (18) blanks out a portion of the feedback signal during discontinuities of the laser diode drive signal to minimize associated noise from distorting the distance measurement.
Meinzer Richard A.
Zepke Bruce E.
Swabey Ogilvy Renault
United Technologies Corporation
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