摘要
针对小直径井壁超声成像测井仪体积小、工作环境温度高等特点,设计了一种脉冲发射电路。电路利用高效升压芯片产生高压,并解决了电感和芯片产生的电磁干扰问题。选用合适的场效应管作为开关元件,设计了合适的驱动电路,提高了场效应管的开关速度,减小了激励脉冲电压的上升时间,有效提高发射脉冲信号的幅度。试验表明:电路产生的脉冲幅度高、宽度窄,能有效地激励超声换能器,很好地满足了井壁超声检测的要求。
Considering the small volume,higher work temperature characteristics of the ultrasonic imaging logging instrument, an impulse transmitting circuit was designed, which used the efficient boost chip to produce high voltage. This circuit eliminated the electromagnetic radiation interference of the boost chip and the inductance. With the help of FET and the dedicated driver circuit, this circuit improved the switch speed of the FET and reduced the rise time of the excitation pulse voltage,effectively enhanced the amplitude of impulse signal. This circuit can effectively incentive the ultrasonic transducer. The experimental results show that the circuit emitting circuit can well meet the requirements of ultrasound imaging logging testing as it produces impulse with high ampli- tude and narrow width.
出处
《仪表技术与传感器》
CSCD
北大核心
2012年第9期21-23,共3页
Instrument Technique and Sensor
关键词
超声成像
直流高压脉冲
发射电路
开关速度
ultrasonic imaging
DC high voltage pulse
emitting ultrasonic circuit
switching speed
