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Detector, is a device fluctuation signals detected some useful information. For identifying wave oscillation or a signal or change in the presence of the device. Detector are typically used to extract the information carried. Detector into an envelope detector and a synchronous detector. The former output signal and the input signal envelope to the corresponding relationship between the main criteria used to demodulate AM signals.
In 1888, the German young scientists Hertz opened the door of electromagnetic waves, the scientific community worldwide stir up immediately. But the drawback is that Hertz instrument can not be applied in practice, he detects electromagnetic waves ring too simple, low sensitivity. Related experiments in the laboratory to cover the curtain, only next to the instrument who can barely see the faint spark. Insight began efforts to explore ways to improve. In 1890, when French physicist Britney in a large repeat Hertz experiment, found the "iron effect": When there is an electromagnetic wave generated when packed in a glass tube inside the iron will immediately perk up, they squeeze tightly make a bunch, so relatively smoothly through the current. Britney will be in effect in accordance with the principles of iron Hertz improvements to the receiver, made of scrap metal detector, the glass tube containing fine iron wires and a battery connected at both ends. In the same year, Britney scrap metal detectors in use, so that the detection range of the electromagnetic wave to 140 meters.
In 1888, the German young scientists Hertz opened the door of electromagnetic waves, the scientific community worldwide stir up immediately. But the drawback is that Hertz instrument can not be applied in practice, he detects electromagnetic waves ring too simple, low sensitivity. Related experiments in the laboratory to cover the curtain, only next to the instrument who can barely see the faint spark. Insight began efforts to explore ways to improve. In 1890, when French physicist Britney in a large repeat Hertz experiment, found the "iron effect": When there is an electromagnetic wave generated when packed in a glass tube inside the iron will immediately perk up, they squeeze tightly make a bunch, so relatively smoothly through the current. Britney will be in effect in accordance with the principles of iron Hertz improvements to the receiver, made of scrap metal detector, the glass tube containing fine iron wires and a battery connected at both ends. In the same year, Britney scrap metal detectors in use, so that the detection range of the electromagnetic wave to 140 meters.
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