File:Hertz micrometer resonator.png
Summary
Resonator <a href="https://en.wikipedia.org/wiki/antenna" class="extiw" title="w:antenna">antenna</a> that German physicist <a href="https://en.wikipedia.org/wiki/Heinrich_Hertz" class="extiw" title="w:Heinrich Hertz">Heinrich Hertz</a> used as a radio wave detector in his first experiments that demonstrated the existence of <a href="https://en.wikipedia.org/wiki/radio_wave" class="extiw" title="w:radio wave">radio waves</a>. It consists of a helix of brass wire in the shape of a ring, with a spark gap between the ends. It probably functioned as a quarter wave antenna. When the radio waves produced by his <a href="https://en.wikipedia.org/wiki/spark_gap_transmitter" class="extiw" title="w:spark gap transmitter">spark gap transmitter</a> were at the resonant frequency of the loop of wire, it produced a high voltage between the ends of the wire, which jumped across a tiny <a href="https://en.wikipedia.org/wiki/spark_gap" class="extiw" title="w:spark gap">spark gap</a>. The spark gap (bottom of loop) was a <a href="https://en.wikipedia.org/wiki/micrometer" class="extiw" title="w:micrometer">micrometer</a> with which he could measure the length of the spark, to get an estimate of the field strength of the waves.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:32, 5 January 2017 | | 860 × 1,412 (84 KB) | 127.0.0.1 (talk) | Resonator <a href="https://en.wikipedia.org/wiki/antenna" class="extiw" title="w:antenna">antenna</a> that German physicist <a href="https://en.wikipedia.org/wiki/Heinrich_Hertz" class="extiw" title="w:Heinrich Hertz">Heinrich Hertz</a> used as a radio wave detector in his first experiments that demonstrated the existence of <a href="https://en.wikipedia.org/wiki/radio_wave" class="extiw" title="w:radio wave">radio waves</a>. It consists of a helix of brass wire in the shape of a ring, with a spark gap between the ends. It probably functioned as a quarter wave antenna. When the radio waves produced by his <a href="https://en.wikipedia.org/wiki/spark_gap_transmitter" class="extiw" title="w:spark gap transmitter">spark gap transmitter</a> were at the resonant frequency of the loop of wire, it produced a high voltage between the ends of the wire, which jumped across a tiny <a href="https://en.wikipedia.org/wiki/spark_gap" class="extiw" title="w:spark gap">spark gap</a>. The spark gap <i>(bottom of loop)</i> was a <a href="https://en.wikipedia.org/wiki/micrometer" class="extiw" title="w:micrometer">micrometer</a> with which he could measure the length of the spark, to get an estimate of the field strength of the waves. |
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