数据采集系统中子样脉冲顶部斜率变化预测技术

The Forecasting Technology of the Top Frequency Changes of the Sampling Pulse in the Data Acquisition System

该技术应用在石油地震勘探仪器的瞬时浮点放大器(以下简称主放大器)中,瞬时浮点放大器对采集到的每个子样脉冲都能选择一个最佳增益值,从而把幅度相差悬殊的地震信号放大至最佳值(2～8V),由于过零点子样脉冲采自信号幅度为零附近,因此子样顶部有较大的斜率,当主放大器最终选定增益值时,子样幅度却在不断增加,如何预测子样幅度的变化趋势,使主放大器准确选择放大倍数,就是本文要讨论的问题。

The technology is applied in the 7-bands instantaneous floating point amplifier in the oil exploration equipment,which selects a extensive gain value from the sampling pulse,then magnify the quake signal broadly to the extensive value.Because the sampling pulse of the across zero comes from the zero magnitude nearby,the frequency of the top pulse is big.When the main amplifier confirms the gain,the magnitude of the pulse is increasing.How to forecast the changing tendency of the pulse magnitude and to select exactly the magnifying times is discussed in the paper.