摘要
介绍了一种用于探测分层液体厚度的超声波测量系统,系统由负高压窄脉冲发射电路、放大电路、限幅电路、滤波以及采集电路组成。主要设计了基于雪崩三极管和Marx结构原理的高压脉冲发射电路,对雪崩三极管的工作情况进行了较详细的分析推导,并分析了电容电阻参数对产生脉冲的影响,给出了元器件的合适参数选择,最后产生了重频可调、幅值大、脉宽窄、上升下降沿快的纳秒级负脉冲,并对具体系统进行测量,结果表明电路能较好地满足系统的要求。
Absrtact:This paper introduces an ultrasonic measuring system for detecting the thickness of layered liquids.The system consists of negative high voltage narrow pulse transmitting circuit,amplification circuit,limiting circuit,filtering circuit and collecting circuit.The high voltage pulse transmitting circuit based on avalanche transistor and Marx structure is designed.The working condition of avalanche transistor is analyzed and deduced in detail,and the influence of capacitance resistance parameters on pulse generation is analyzed.The suitable parameters of the components are given.Finally,the negative nanosecond pulse with adjustable repetition frequency,large amplitude,narrow pulse width and fast rising and falling edge is produced,and the concrete system is measured.The results show that the circuit is based on the circuit can meet the requirements of the system well.
作者
刘章杰
李青
Liu Zhangjie;Li Qing(China Jiliang University,Hangzhou 310018,China)
出处
《科技通报》
2019年第10期118-123,共6页
Bulletin of Science and Technology
基金
国家重点研发计划课题(2017YFF0205501)
浙江省重点研发计划项目(2018C03035)
关键词
超声波测量
脉冲发射电路
雪崩三极管
纳秒级脉冲
ultrasonic measurement
pulse generation circuit
avalanche transistor
nanosecond pulse
