Distance measuring method and apparatus therefor

Details Distance measuring method and apparatus therefor Distance measuring method and apparatus therefor

G - Physics

01

S

343/6

G01S 7/48 (2006.01) C21C 5/46 (2006.01) G01F 23/284 (2006.01) G01S 13/32 (2006.01) G01S 13/88 (2006.01) G01S 17/10 (2006.01) G01S 17/32 (2006.01)

Patent

CA 2038818

ABSTRACT OF THE DISCLOSURE A distance measuring method and an apparatus therefor, in which used are first and second pseudo random signals which are equal to each other in pattern but slight different from each other in frequency. A first time-series pattern obtained by multiplying the first pseudo random signal by the second pseudo random signal is generated, laser light intensity-modulated with the first pseudo random signal is radiated to a target, the light reflected from the target is received, and a intensity change of the received reflected-light is converted into an electric signal. A second time-series pattern is obtained by multiplying the electric signal as a reception signal with the second pseudo random signal. The distance to the target is measured by calculating the time difference between the first and second time-series patterns.

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