On the assumption that there was a small solid sphere in the focusing area, the scattering field of concave sphere ultrasonic transducer was analyzed. 以凹球面超聲換能器為研究對象，假設聚焦區存在一剛性球形微粒，對此時(shí)的散射場(chǎng)進(jìn)行分析。
From the Fourier space K corresponding to the scattering field of the object, an imaging evaluation mechanism based on the spatial spectral coverage is proposed. 摘要從物體散射場(chǎng)對應的傅里葉空間出發(fā)，提出基于空間譜域分布的成像系統定性評價(jià)體系。
Finally, a method has presentedalso for the fringing field distribution measured experimentally in magneticfield. 最后敘述了由實(shí)驗測量得到磁場(chǎng)的邊緣場(chǎng)分布時(shí)有限積分數值的計算方法。
The area pictured is one-thousandth of Kepler's full field of view, and shows hundreds of stars at the very edge of the constellation Cygnus. 本圖區域面積約為整個(gè)視圖的千分之一，顯示出天鵝座相當邊緣區域的數百顆恒星。
