航空站的自动探测系统在判断旅客口袋或手提包里的反射性物体时已没有什么困难,但是它不能识别可疑的物体。宾夕法尼亚大学的研究人员正在研究用毫米波全息照相增加其作用范围的方法。 An automatic detection system at an aeronautical station has found no difficulty in determining reflective objects in a passenger's pocket or handbag, but it does not recognize suspicious objects. Researchers at the University of Pennsylvania are working on ways to increase their range with millimeter-wave holography.