英国政府公路运输研究实验所的科研人员,最近在伯克郡锡尔的公路上安装了一台超载货车报警器,以便及时发现违章车辆。实验人员将一根光纤电缆埋在公路下面。当载重汽车在上面驶过时,会挤压电缆的橡胶包皮,使光纤电缆弯曲,从而使到达 Researchers at the British government’s Highway Transport Research Laboratory recently installed an overloaded truck alarm on the road in Syber, Berkshire, to detect illegal vehicles in time. The experimenter buried a fiber optic cable under the road. When the truck passes over it, it squeezes the rubber sheath of the cable, bending the fiber optic cable so that it reaches