%0 Journal Article
%T Directivity of phase array vibrators in seismic exploration<br>地震勘探中相控阵震源的方向特性研究
%A WANG Zhong-Ren
%A LIN Jun
%A FENG Sheng-Ya
%A Ministry of Education
%A Changchun
%A China
%A Institute of Mathematics
%A Jilin University
%A Changchun
%A China
%A <br>王忠仁
%A 林君
%A 冯声涯
%J 地球物理学报
%D 2006
%I 
%X The extrusive difficulty in urban shallow strata seismic exploration with vibrators driven by electromagnetic force is that the weak reflective seismic signals are often flooded in strong noise background. For increasing signal-noise ratio of seismic records, one can make use of vibrator arrays by phase controlling to concentrate seismic waves into a directed beam so as to enhance the energy of seismic waves. We discuss the mechanism of wave beam forming for the phase array vibrators, give a definition of the marginal energy density for the seismic wave field, and make some quantitative analyses to the energy intensity along each direction on the snapshot of the wave field. Then the finite difference method is used to simulate the response to the Chirp signals produced by the phase array vibrators. When the concentration zone of the directed seismic beam is coincident with the range of the geophone arrangement, the energy intensity of the synthetic seismogram with the phase array vibrators is obviously higher than that with a single vibrator, and the uniformity of the amplitude of seismic wave for the phase array vibrators is obviously better than that for a set of vibrators sprung at the same time.
%K Phase array vibrators
%K Wave beam forming
%K Marginal energy density
%K Chirp signals
%K Numerical simulation<br>相控阵震源
%K 波束形成
%K 边际能量密度
%K Chirp信号
%K 数值模拟
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=6324A79B24D148B1&yid=37904DC365DD7266&vid=2A3781E88AB1776F&iid=E158A972A605785F&sid=ACF317960D6DF955&eid=839CF8520FE9DA44&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=6&reference_num=19