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现在研制成了一种电子加权的检波器組合系统,它既能加强对噪音的衰减,也能減少野外设备。提高衰減噪音的能力是由于电子加权組合元件的应用;而野外设备的減少是由于这种系统在设计方面与众不同,它能使一个检波器同时为两个独立的且相毗邻的空间检波器组服务。在该系统中,每一记录站上都加了一个小放大器单元,而这个放大器单元与普通的多芯陆用电缆连接在一起。每串有10个检波器安置在记录站放大器之间。每个放大器都接受它两侧的两个检波器串上来的信号,这样在每一个记录站上都形成了一个包括20个检波器的组合。由于每一个检波器都要同时为两个空间组合服务,因此,在收、放排列时,一个记录站只需搬动一个放大器单元和10个检波器。为了达到一个加权的切比雪夫空间组合,对来自组合中的20个检波器的每一个检波器的信号都要进行电子加权。为了获取一个具备至少有40分贝的等波涟抑制衰減范围的理论响应函数,在理论的与实际上能达到的野外性能之间,选擇了一种折衷的设计方案。这个组合系统在野外已对24个检波器整数加权的单线系统直到72个检波器的面积组合系统进行了试验。试验地点有的在得克萨斯州,有的在新墨西哥州,也有的在俄克拉荷马和蒙大拿州。在全部试验中,这个组合系统的效果同于或高于其它组合系统所得的记录和剖面。
An electronically weighted geophone assembly system has now been developed that enhances noise attenuation and reduces field equipment. The ability to improve noise attenuation is due to the use of electronically weighted combination elements; and the reduction in field equipment is due to the unique design of this system, which allows one detector to be simultaneously two separate and adjacent space geophones Group service. In this system, a small amplifier unit is added to each recording station, and this amplifier unit is connected with an ordinary multi-core land cable. Ten detectors per string are placed between the recording station amplifiers. Each amplifier accepts signals from two detector strings on either side of it, thus forming a combination of 20 detectors at each recording station. Since each detector needs to serve both space groups at the same time, only one amplifier unit and 10 geophones need to be moved from one recording station to another when it is received. In order to achieve a weighted Chebyshev space combination, the signals from each of the 20 detectors in the combination are electronically weighted. In order to obtain a theoretical response function with a dipole suppression attenuation range of at least 40 dB, a compromise design was chosen between theoretical and practically achievable field performance. This combined system has been tested in the field in a single-wire system that has 24 detector integer weights up to 72 detector area combinations. Some test sites in Texas, some in New Mexico, and some in Oklahoma and Montana. In all experiments, the combined system achieved the same or better results than other combined systems.