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一、原理及结构:SP-2型浅地层剖面仪:是利用回声测深的原理,接收阻抗(PG)不同的地层界面所反射的声脉冲讯号,并在记录纸上相应“描绘”出海底50米左右的松散沉积物分层剖面图的一种连续走航自记的声学电子仪器,可以应用于浅海沉积调查、港工码头建设,桥基工程、海底电缆铺设等地质探测工作。SP-2型浅地层剖面仪由发射换能器,接收换能器、发射机、接收机、记录机,稳频同步电源及汽油发电机等七个部件组成。工作原理类同回声测深仪,所不同之处是“剖面仪”的记录图象是海底下数十米松散沉积物,要求声波在地层中的衰减损失α要小,而α与频率的一次方成正比,即α=Af(A与沉积物的类型有关系)故剖面仪的反射频率远比回声测深仪低,它是由高压1400V经全波整流,经储能电容C储电,再经发射换能器放电,产生一个宽频(1.2KC-10KC)单脉冲声波,主频在3KC左右,脉宽0.3mSo接收机采用带通滤
First, the principle and structure: SP-2 shallow stratigraphic profiler: is the use of echo sounding principle, the receiving impedance (PG) different interface reflection layer acoustic pulse signal, and the corresponding recording paper Acoustic electronic instrument with continuous navigation and self-recording of stratified cross-sectional view of loose sediment about 50 meters away from the sea floor can be applied to geological exploration work such as shallow sea sediment survey, harbor dock construction, bridge foundation engineering and submarine cable laying. SP-2 shallow stratigraphic profiler consists of seven components: transmitting transducer, receiving transducer, transmitter, receiver, recorder, frequency stabilization synchronous power supply and gasoline generator. The working principle of the same echo sounder, the difference is that “profile meter ” of the recorded image is tens of meters below the sea floor loose sediment, acoustic attenuation in the formation requires a small α, and α and frequency Of the square is proportional to, that α = Af (A and sediment types are related) so the reflection frequency of the profiler is far lower than the echo sounder, which is full-wave rectified by a high voltage 1400V, the storage capacitor C storage Electricity, and then fired by the firing transducer to produce a wide-band (1.2KC-10KC) single pulse sound waves, clocked at about 3KC, pulse width 0.3mSo receiver bandpass filter