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本文从井下超声电视声系出发,详细分析和推导了回波时间检测门限的理论模型,设计了一种自适应门限网络,使检测门限电平能随着噪声电平和换能器的余振而变化.实践证明,这种技术对于克服由换能器余振干扰、信号大范围起伏造成的时间检测困难十分有效.
Based on the sound system of downhole ultrasound TV, this paper analyzes and deduces the theoretical model of echo time detection threshold in detail, and designs an adaptive threshold network so that the threshold level of detection can vary with the noise level and the residual vibration of the transducer It has been proved by practice that this technique is very effective in overcoming the difficulty of time detection caused by the interference of the transducer residual vibration and the large-scale fluctuation of the signal.