The Characteristic Of The Source/Receiver In The Physical Model By Experiment Research

We generally use piezoelectric ultrasonic transducers as the source and receiver in the seismic physical model data acquisition.But the source and receiver used as transducer is different from the field actual source due to the size and the spectrum in the physical model laboratory,including characteristics of the wavelet,directional amplitude and waveform distortion.In this paper,we measure wavelets and through to the laboratory transducer of the different structure and size amplitude directivity characteristics of the different structure and size transducers.And we draw a conclusion that the existing transducer are not completely conform to the requirements of the physical model of the data collection.So we must according to different data acquisition requirements to select the appropriate transducer,and get the best seismic data.Due to the radiation of the transducer has directivity but the field source radiation is not directivity.In order to make the laboratory data is consistent with the field data,we must correct the data from the laboratory.In this paper,we get the more accurately directivity of the transducer by the new experiment device.And then we correct the collected data with the theoretical formula and experimental data and concluded that the measured data compensation effect is better.In addition,it will occur the waveform distortion when we collect data with the transducer.In other words,the received signal will change with the offset.In this paper,we prove transducer waveform distortion by numerical simulation and physical simulation.And we combine with the theoretical model,give a method of waveform distortion correction.Then we correct the actual measurement data by this method and get better correction effect.