Preliminary Determination of the Optimal Parameters When Using an Ultrasonic Probe to Measure Cavern Geometry Where a Metal Borehole Pipe Is Present

In order to determine the optimal parameters when using an ultrasonic probe measure cavern geometry a metal borehole pipe is present, investigation was firstly carried out on influence of vertical plates with thickness from 1 mm 15 immersed in water transmitted and reflected waves. The results obtained will be used as indicator for measurement underground which placed inside lining borehole. These studies were performed both by experiment computer simulation. show that wavelength incident signals should equal half plate or integer times smaller than this thickness. When barrier unknown, signal linear frequency modulation (LFM) used. Due reverberation waves caverns filled water, distance transducer wall can measured if it longer three diameter. Frequency analysis enables wave selected, conditions pipe.