Light-wave rangefinder using a pulse method

A light-wave rangefinder using a pulse method, comprising:

• a light-emitting unit for emitting pulsed measuring luminous flux toward a target to be measured;
• a light receiving unit for receiving the luminous flux reflected by the target to be measured, and converting the luminous flux into an electric signal;
• a tuned amplifier for converting the electric signal of the light receiving unit into a damped oscillation waveform;
• an arithmetic processing means for calculating a distance from a measuring position to a reflecting object on the basis of the damped oscillation waveform of the tuned amplifier;
• an optical-noise sampling unit for sampling an optical noise produced in the light-wave rangefinder;
• and
• an optical-noise storage unit for storing sampling data of the optical-noise sampling unit;
• wherein said arithmetic processing means reduces a measurement error caused by the optical noise on the basis of the sampling data of the optical-noise storage unit, and thereby calculates a distance, a measurement error of which is reduced.