Sliding Contacts to Transmit Small Signals
- 1 December 1949
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 20 (12) , 930-932
- https://doi.org/10.1063/1.1741430
Abstract
Measurements have been made of root‐mean‐square noise voltage in the frequency range 0.5 to 200 c.p.s. generated by contacts sliding at low speeds using four arrangements of contacting bodies and various materials. Mercury with amalgamated probes gave the lowest noise levels. Some solid contacts operating with low friction on clean metal surfaces yielded values of generated noise below 1 microvolt at a sliding speed of 35 cm/sec. when two contacts were in parallel. The noise increases with speed and varies with normal force. The r.m.s. generated noise voltage of a large number of independently mounted contacts in parallel is inversely proportional to the square root of the number of contacts.Keywords
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