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据报导,第一批盲人用探路器最近在国外制成.它形如手电筒,使用频率扫描装置工作,因此,在任何瞬间,探路器发射的频率与接收频率之间的频差与信号传播和自物体反射回来所经过的整个时间成比例.当探路器愈接近前面物体时,使频差大为减小,此频差可在盲人佩戴的听筒中听出,使盲人避开前面物体.
It has been reported that the first blinds were recently made abroad, which is in the form of a flashlight and operates with a frequency sweep device so that at any given moment the frequency difference between the frequency of the transmitter and the reception frequency is compared with the signal Propagation is proportional to the entire time that the object is reflected back.When the pathfinder is closer to the front object, the frequency difference is greatly reduced, and the frequency difference can be heard in the handset worn by the blind so that the blind can avoid the front object.