G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 17/02 (2006.01) G01S 17/10 (2006.01)
Patent
CA 2602984
A pulse light receiving time measurement apparatus according to the present invention includes a light receiving element receiving reflected pulse light from an object to be measured; a pulse light receiving time measurement circuit measuring a time when pulse light is irradiated to the object and a time when the reflected pulse light from the object is received at the light receiving element; a resonance circuit converting an optical pulse signal of the reflected pulse light from the light receiving element into a damping signal; a multi-stage amplifier group amplifying the damping signal from the resonance circuit; a damping signal processing circuit composed of amplitude comparators and zero-cross comparators, and processing the damping signal from each stage of the multi-stage amplifier group, in which operations of the respective zero-cross comparators are determined according to comparison results of the respective amplitude comparators for the amplifier group.
Minegishi Isao
Yoshino Kenichiro
Fetherstonhaugh & Co.
Kabushiki Kaisha Topcon
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