摘要
声波测井换能器的激发响应由换能器振动时所表现出来的动态阻抗和激发电路参数决定。而换能器的动态(阻抗)参数随压电晶体及其装配方式(力学边界条件)改变。为了测量换能器动态参数的影响,采用声波测井仪器常用的压电晶体和升压变压器,通过改变激发脉冲宽度和直流电压进行了实验,结果发现:在换能器两端的瞬态响应中,一共有三个二阶网络响应,分别对应于不同的频率。最低的一个影响声波测井波形的基线、与换能器主频接近的一个决定激发效率以及电路与压电晶体之间的匹配关系,是激发电路设计中比较关键的,其参数可以通过导纳圆测量仪器得到。
Sonic transducer response is affected by the dynamic characters of electricity and mechanics of the sonic transducer.The dynamic parameter of the sonic transducer changes with piezoelectricity crystal and method of assemblage.From experiments,we find that there are three responses of 2 ranks network in a sonic transducer response.Their frequencies are different.The highest one does not affect the sound produce.The lowest one produces the change of basic line of waveforms.The mid one is of the most important for sonic logging.
出处
《石油仪器》
2006年第2期55-58,4,共4页
Petroleum Instruments
关键词
声波测井
换能器
激发电路
二阶响应
sonic logging,transducer,inspire circuit,2 ranks network response
