作者采用超声波作波源,用水泥、沙、石头等原料制成的混凝土灌制在岩石上,作为被测对象,测出混凝土的厚度。实验使用的仪器是SYC-2型声波岩石参数测定仪,该仪器由接收机和发射机组成。发射仪器产生宽度可调的负方波,通过小电缆线加在压电晶体换能器(发射探头)上,产生超声波。超声波通过被测物质传播,被接收换能器(接收探头)转换成电信号,通过电缆线送入接收机放大,显示在示波器上。在厚度测试试验中,发射探头和接收探头均放在混凝土块表面,故反射波的走时方程为:。其中Δ为两探头间的距离,H为混凝土厚度,v为波速,t为反射波到时。其中Δ可直接量出,v也可测出。故只要把反射波的初至到时t读出,就可通过上述方程式解出在实际情况中,反射波初至的拐点是不好辨认的,接收探头接收的波形中,由于有很多震相的迭加而有很多的拐点,但在这 The author uses ultrasonic wave source, concrete, made of cement, sand, stone and other raw materials poured on the rock, as the measured object, measured the thickness of concrete. The instrument used in the experiment is SYC-2 Sonic Rock Parameter Analyzer, which consists of receiver and transmitter. The transmitting instrument produces a negative square wave of adjustable width that is applied to the piezoelectric crystal transducer (launch probe) via a small cable to produce ultrasonic waves. Ultrasound is transmitted through the measured substance, is received transducer (receiving probe) into electrical signals, into the receiver through the cable to enlarge, displayed on the oscilloscope. In the thickness test, the transmitting probe and the receiving probe are placed on the surface of the concrete block, so the traveling wave equation of the reflected wave is:. Where Δ is the distance between the two probes, H is the concrete thickness, v is the wave velocity, t is the reflected wave to the time. Where Δ can be measured directly, v can be measured. So as long as the first arrival of the reflected wave to read t can be solved by the above equation in the actual situation, the first inflection point of the reflected wave is not well recognized, the receiving probe receives the waveform, due to a lot of seismic phase And there’s a lot of inflection points, but here