Controlled source of pulse codes

Abstract

The invention relates to a controlled source of pulse codes. The bottom end of a base connection carriage is connected with a lower pressing plate at the lower one-third position of the carriage, a coil cylinder and a coil are arranged between an upper pressing plate and the lower pressing plate, a fastening screw penetrates through a locating sleeve to be connected with the upper pressing plate and the carriage, a code controller is connected with the coil, an adjustable screw support cylinder is installed in the middle of the upper pressing plate, and an adjustable screw is connected with the adjustable screw support cylinder to form the controlled source. Coding impact orders generated by the controlled source of the pulse codes has ideal paseudo-random characteristics, can notably reduce impact times, improves construction efficiency, and has high seismic prospecting resolution ratio and signal to noise ratio due to the fact that codes stimulate obtained original seismographic records which can be equivalent to macro-energy single-pulse source signals after relevant decoding operation. Mechanical parts of the controlled source can be rapidly disassembled and assembled, and is convenient to carry and construct, applicable to earthquake exploration in cities and mountainous regions and superficial layer projects, simple in structure, convenient to carry and high in stability.

Description

Technical field: [0001] The invention relates to an impact type vibrator for seismic exploration, in particular to a pulse coded vibrator for shallow seismic exploration. Background technique: [0002] The seismic source is the source of the signal in seismic exploration. The seismic sources in marine seismic exploration mainly include electric spark source and air gun source. In land seismic exploration, explosive source has been used as the main source form. However, there are many disadvantages in the explosive seismic source. Firstly, due to the serious damage to the environment, the explosive seismic source is not suitable for use in cities, and high compensation fees are often required to be used in farmland; secondly, in order to effectively transmit the excited energy Underground, the seismic source of explosives usually needs to be excavated after drilling and landfilling. The expensive drilling costs make the cost of seismic exploration high; thirdly, in mountainou...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that, first of all, in order to obtain an ideal random shock sequence, hundreds or even thousands of shocks are required, and the receiving time can usually reach several minutes. Conventional seismographs cannot meet the requirements and reduce the construction cost. Exploration efficiency, increased construction costs

Secondly, it is difficult to obtain an ideal random sequence due to the limitations of the inherent characteristics of the impact tamping. Therefore, the correlation noise with strong energy will have a great impact on the signal-to-noise ratio of seismic records.

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