Pulse light receiving time measurement apparatus and distance measurement including the same

• Main Authors: YOSHINO, KENICHIRO, MINEGISHI, ISAO
• Format: Patent
• Language: English
• Published: 27.09.2012
• 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; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

PULSE LIGHT RECEIVING TIME MEASUREMENT APPARATUS AND DISTANCE MEASUREMENT INCLUDING THE SAME A pulse light receiving time measurement apparatus (1) according to the present invention includes a light receiving element (13a) receiving reflected pulse light from an object to be measured; a pulse light receiving time measurement circuit (2) measuring a time when pulse light is irradiated to the object and a time when the reflected pulse light from the object is received a the light receiving element (13a); a resonance circuit (13b) converting an optical pulse signal of the reflected pulse light from the light receiving element (13a) into a damping signal; a multi-stage amplifier group (13c) amplifying the damping signal from the resonance circuit (13b); a damping signal processing circuit (13d) composed of amplitude comparators (13f) and zero-cross comparators )13g), and processing the damping signal from each stage of the multi-stage amplifier group (13c), in which operations of the respective zero-cross comparators (13g) are determined according to comparison results of the respective amplitude comparators (13f) for the amplifier group (13c). U,, CCol (0 CW() 4vH C~j 10