Laser range finder

In a laser rangefinder which transmits laser pulses and receives them after reflection, range being determined from the pulses' time of flight, delays lines 411, 413 ensure that internal delays are compensated for so that the difference in time between the outputs of delays 411, 413 equals exac...

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Bibliographic Details
Main Author YEU-HWA SHYY
Format Patent
LanguageEnglish
Published 27.04.1994
Edition5
Subjects
ANALOGOUS ARRANGEMENTS USING OTHER WAVES
DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES
LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES
MEASURING
PHYSICS
RADIO DIRECTION-FINDING
RADIO NAVIGATION
TESTING
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Summary:In a laser rangefinder which transmits laser pulses and receives them after reflection, range being determined from the pulses' time of flight, delays lines 411, 413 ensure that internal delays are compensated for so that the difference in time between the outputs of delays 411, 413 equals exactly the time of flight of the pulses. This time is determined by further delaying 412 the delayed transmitted pulse until the further delayed transmitted pulse coincides with the delayed reclined pulse; the further delay then corresponds to the time of flight. Searching for coincidence may be facilitated by arranging for the delayed received pulse to be lengthened initially by delay 413, and then coarse coincidence is established, shortening it.
Bibliography:Application Number: GB19920022278