Speed measurement manner and its device null of the shear wave and the compression wave in stratigraphic

摘要

PURPOSE:To measure the shear speed of bed logging by using the shear wave by a sonde consisting of two receivers which are at a constant distance to one oscillator. CONSTITUTION:The sonde 2 suspended in a boring hole A filled with water by a cable 1 is provided with the oscillator 3 and receivers 4 and 5 at the constant intervals from below. A voltage control signal from a controller main body 6, measurement signals from the receivers 4 and 5, etc., are transmitted and received by the cable 1. A computer 6a is coupled with the control main body 6. The shear wave from the oscillator 3 made of a couple of rectangular bimorph piezoelectric ceramic materials is received by the receivers 4 and 5 made of a couple of rectangular bimorph piezoelectric ceramic materials to measure the initial motion of each shear wave, thereby measuring the shear wave speed of the bed from the time difference in initial motion between the two receivers.