摘要
本文通过实验模拟的方法研究了声波测并相控线阵声波辐射器的指向性测量方法。实验中自制了三个不同结构的声波测井相控线阵辐射器和相应的多通道激励信号源,利用高精度定位系统和数据采集系统等设备测量了各个相控线阵辐射器在水中的垂直指向性。实验结果表明,随着相邻阵元的激励信号延迟时间的增加,相控线阵的辐射声束指向角不断变大;通过适当的幅度加权、降低激励信号的频率、调整阵元的间距等措施可以改变辐射声束的方向和辐射主瓣的角宽。把指向性实验测量结果与理论计算进行比较,一致性很好。声波辐射器辐射声波方向和辐射主瓣角宽的调整和控制对于新一代声波测井和井间地震勘探技术具有重要意义。
The paper studied the measurement method for directivity of phased-array acoustic transmitter in acoustic log by experimental modeling method. Three phased-array acoustic transmitter in differ-ent structure used for acoustic log and relevant multi-channel signal source are made by ourselves in laboratory and using high-precision positioning system and data acquisition system to measure the vertical directivity of each phased-array acoustic transmitter in the water. The experimental results showed that along with increasing the delay-tirne of impulsive signal on adjacent array elements,the steered radiation angle of acoustic beam of phased-array becomes larger and larger. The direction of a-coustic beam and angular width of main lobe can be changed by properly amplitude-weighting,decreas-ing the frequency of impulsive signal and adjusting the interval of array elements. Comparing the ex-perimental results of directivity with theoretical computation has good consistence. The adjustable and controllable characters of acoustic direction and angular width of radiation main lobe in acoustic transmitter are of great importance to new gen-eration of acoustic log and cross-hole seismic ex-ploration.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2003年第6期661-665,679,共6页
Oil Geophysical Prospecting
基金
国家自然科学基金资助项目(40044012)
CNPC测井重点实验室资助项目。
关键词
声波测井
相控线阵
声波辐射器
指向性测量
地震勘探
acoustic log,phased-array transmitter, radiation,acoustic beam,array element ,directivity
