【摘要】 本文分析了数字井下超声电视系统中影响系统性能的几个主要参数,其中包括距离测量误差、系统的裂缝分辨力、超声换能器的副瓣影响以及声波的传播损耗等.距离测量误差主要取决于时间测量精度,在正常条件下系统的平均距离检测误差可达0.3mm.裂缝分辨力与波束粗细和系统增益有关;系统的最高分辨力约为1mm.文中还分析了如何消除声波副瓣的影响等.本文分析的结果不但对于研制与应用数字井下超声电视有指导意义,而且对于超声技术的其它工业应用亦有参考价值.更多还原

【Abstract】 The effects of several parameters of a digital ultrasonic borehole televiewer (DUBT) on system performance are analyzed, for example, those of the distance measuring error, the crack distinguishability, the side beam of the ultrasonic transducer and the wave propagation attenuation, The distance measuring error depends mainly on the accuracy of time measurement. It is 0.3mm on an average under normal conditions. The crack fistinguishability is related to the beam diameter and the system gain. The highest crack distinguishability is about 1 mm. The method for eliminating the influence of the side beam is also discussed.更多还原