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Pages: 49-58
Year: Issue:  1
Journal: Chinese Journal of Geophysics

Keyword:  振源中心型二维地震自由振动声脉冲模型试验钛酸短柱体非周期性发射强度;
Abstract: The character of a transmitting source plays an important part in seismic model experiments for obtaining a distinct wave form with short duration on the receiving record. The present paper describes two kinds of transmitting sources: the source of central expanding force and the source of normally concentrated force. A cylindrical piezo-electrical crystal of barium titanate inserted in the central hole of a circular plate was used as the source of a central expanding force. It is found when the initiating electrical pulse has a time duration corresponding to one cycle of the radial resonant frequency of the crystal, the received seismogram shows the most distinct wave form with short duration. A rod type transducer of barium titanate in contact with the edge of a semi-circular plate with a thickness of 2mm was used as a source of normally concentrated force. It is found that when the diameter of the transducer is less than 5mm, the directional effect of intensity is similar to that of a point source. In general, this kind of transducer will produce a satisfactory wave form in the receiving record. The detector consisting of a barium titanate cylinder attached to the end of a brass rod with the same diameter were used in all the experiments.
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