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说也奇怪,到本世纪40年代,世界上发达国家正在向电气化进军,可是在地下矿井里的矿工们依然靠矿灯、敲钟打点、手势和吹口哨等手段来进行通讯联络。后来尽管也架设一些简陋的有线电话,但是由于冒顶、塌帮、倒棚和各种机械的碰、撞、震,加上井下机器与人声嘈杂,使井下通讯既不可靠又不灵活,遇上险情、灾祸,往往是线断音无,咫尺天涯,束手无策。 到了50年代末,德国科学家发现井下金属导体很多,如钢轨、管子、电缆等,如果利用这些导体来传递声波那不很好吗?经过多次试验,一种利用这些导体作媒介,既像有线电、又像无线电的通讯试验成功了,给它起个美名曰“感应电话”。
Strange to say, by the 1940s, the developed countries in the world are marching toward electrification. However, miners in underground mines still rely on miner’s lamp, bell strike, gesture and whistle for communication. Later, although some simple wired telephone lines were erected, the downhole communication was neither reliable nor flexible due to the roof falling, collapsing, falling awkwardness and the collision, collision and shock of various machinery and underground machines and voices. On the danger, disaster, often disconnect sound without, close at hand, helpless. By the late 1950s, German scientists found many underground metal conductors, such as rails, pipes, cables, etc., which are not very good at using these conductors to transmit sound waves? After many tests, one kind of use of these conductors as a medium, Electricity, like radio communication test was successful, give it a nickname “induction phone.”