The localizer is composed of two parts:a constant current constant frequency signal source and a signal detector.

装置由恒流信号电源和信号检测装置两部分组成。

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After he pulls away Harris waves a signal detector over Alexis' body and produces a tracking device on the hospital wristband.

哈里斯将车停在了一边，他在亚历克西斯身体上方挥动一个信号探测器，找到了在他的护腕上有一个追踪装置。

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After he pulls away, Harris waves a signal detector over Alexis' body and produces a tracking device on the hospital wristband.

哈里斯将车停在了一边，他在亚历克西斯身体上方挥动一个信号探测器，找到了在他的护腕上有一个追踪装置。

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But when poachers carrying rifles or machetes traipse by a detector, it will send a radio signal to a treetop antenna.

ECONOMIST: Monitor

Its reaction with the odour molecules changes a detector's electrical resistance, and this signal is fed into a neural net (the closest that computer technology has got to imitating the pattern-recognising abilities of networks of nerve cells) to work out what is being smelt.

ECONOMIST: Wine-tasting will never be the same again

Light striking this detector liberates electrons from some of the silicon atoms, producing an electrical signal that is converted by the chip's electronics into a picture.

ECONOMIST: Camera-phones