Seddon N, Bearpark T
Optics and Laser Technology Department, Advanced Technology Centre, BAE Systems, Post Office Box 5, Filton, Bristol BS34 7QW, UK.
Science. 2003 Nov 28;302(5650):1537-40. doi: 10.1126/science.1089342.
We report experimental observation of an inverse Doppler shift, in which the frequency of a wave is increased on reflection from a receding boundary. This counterintuitive effect has been produced by reflecting a wave from a moving discontinuity in an electrical transmission line. Doppler shifts produced by this system can be varied in a reproducible manner by electronic control of the transmission line and are typically five orders of magnitude greater than those produced by solid objects with kinematic velocities. Potential applications include the development of tunable and multifrequency radiation sources.
我们报告了逆多普勒频移的实验观测结果，即在波从后退边界反射时其频率会增加。这种违反直觉的效应是通过使波从输电线路中的移动不连续处反射而产生的。该系统产生的多普勒频移可以通过对输电线路进行电子控制以可重复的方式变化，并且通常比具有运动速度的固体物体产生的频移大五个数量级。潜在应用包括可调谐和多频辐射源的开发。
