JW-5型地下电磁波探测系统设计

JW-5地下电磁波探测系统是一种新型设备,它由数据采集系统和数据处理系统组成。数据采集系统包括井中发射机、接收机和地面收录控制器等;数据处理系统包括数据预处理、正反演和图形图像等模块。发射机发射宽频带程控扫频的脉冲信号,接收机同步接收此扫频脉冲信号。数据经地面收录控制器记录并送至数据处理系统处理、成图。这里介绍了该系统的组成和主要设计思想,重点说明了井中发射机、接收机、地面收录控制器和软件系统的设计方案和性能。JW-5地下电磁波探测系统可以跨孔方式探测钻孔间的剖面,也可以单孔方式探测孔周围。系统轻便,能适应小口径钻孔。针对不同应用目的,设计开发了适用于钻孔、坑道等型号的设备,并给出了应用实例。

The design of JW-5 borehole em system

JW-5 borehole EM system is a new instrument for downhole (or underground) geophysical survey, which consists of a data acquisition unite and a data processing unit. A downhole transmitter, a downhole receiver and a ground acquisition control panel are included in the data acquisition unite, while the data processing unit comprises modules for pre-processing, forward and inversion computations, as well as graphics and imaging. The transmitter emits broad-band programmable frequency-scanned pulses and the receiver receive them synchronously. Data recorded by the ground acquisition control panel are transferred to the data processing unit for curving. JW-5 can be used to detect profiles between drilling holes by cross-borehole mode or shoulder beds in vicinity by single-borehole mode and can be adapted to 1000-meter deep holes. The design of the system and its performances are introduced in the paper, and with a case history presented.