File:Oudin coil Fleming.png
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[edit]DescriptionOudin coil Fleming.png |
English: An early Oudin coil apparatus, a resonant transformer circuit similar to a Tesla coil invented by French physician Paul Marie Oudin around 1893, used in the obsolete medical field of electrotherapy during the first decades of the 20th century. It generated very high voltage, low current, high frequency AC current, 200 - 1000 kV at frequency between 200 kHz and 2 MHz. The high voltage terminal at top is connected through a wire to a handheld electrode (lying in front of coil), which produced streamer arcs and brush discharges which were applied to the patient's body to treat various medical conditions. It consists of a small horizontal solenoid coil (center) connected to two Leyden jar capacitors to make a tuned circuit with a spark gap (below) enclosed in a glass tube to muffle the sound. A potential of 3 - 15 kV from an induction coil (separate, not shown) repeatedly charges the capacitors, which then discharge through the spark gap and solenoid, creating damped radio frequency oscillations. The large resonator coil (top) is connected to a tap on the solenoid coil. The resonator acted as a second tuned circuit; theparasitic capacitance between its ends resonates with its large inductance. When the tap on the solenoid was adjusted so the primary tuned circuit and the resonator coil had the same resonant frequency, large oscillating voltages were induced in the resonator due to its high Q. This is an early circuit, in later Oudin circuits the two coils were wound on the same axis to make a transformer. |
Date | |
Source | J. A. Fleming, "The Principles of Electric Wave Telegraph and Telephony," 2nd. ed., Longmans, Green & Co., London, 1910 |
Author | J. A. Fleming |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. ![]() Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).
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current | 23:27, 30 April 2011 | ![]() | 400 × 846 (149 KB) | Wdwd (talk | contribs) | == Summary == {{Information |Description={{en|An Oudin coil from 1898}} |Source=J. A. Fleming, "The Principles of Electric Wave Telegraph and Telephony," 2nd. ed., Longmans, Green & Co., London, 1910 |Date=1910 |Author=J. A. Fleming }} == Licensing == {{ |
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