According to the principle of impulse GPR, the short pulse generator is an important basic circuit of GPR, it is an important part of radiationexcitation and sampling circuit.
Computations are performed for radiation field of inclined and horizontal four-element array with turnstile excitation, and some typical patterns are shown.
对倾斜的和水平的四元阵按相位旋转方式激励时的辐射场进行了计算、示出一些典型辐射图。
3
The results show that the annular array in different combination and excitation condition has radiation characteristics of monopole, dipole and quadrupole of acoustic logging.