SURVEYING DEVICE AND SURVEYING METHOD

摘要

A surveying device and method for measuring the delay time or distance with a smaller measurement error by directing a light beam to an object to be measured and receiving the reflected light beam. A reference pulse light (r) and a measurement pulse light (o₁) are received as light reception signals by a light-receiving section (9). A damping signal (S3U) is generated from the light reception signals (r, o₁). The gain of the signal of minute level near the zero-cross point (Q₀) of the damping signal (S3U) is made high to amplify the signal with the high gain. Timing signals (r', O₁') are generated using the amplified signal. With this, the measurement error can be minute.