Collector: Difference between revisions
From Glossary of Meteorology
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<div class="definition"><div class="short_definition">A class of instruments employed to determine the [[electric potential]] at a point in the [[atmosphere]], and ultimately the [[atmospheric electric field]].</div><br/> <div class="paragraph">All collectors consist of some device for rather rapidly bringing a conductor to the same [[potential]] as the air immediately surrounding it, plus some form of [[electrometer]] for measuring the difference in potential between the equilibrated collector and the earth itself. Collectors differ widely in their speed of response to atmospheric potential changes. When a flame is used to increase the local [[ion density]] and thereby facilitate potential equilibration, some advantage over a simple exposed conductor is gained; the [[relaxation time]] becomes of the order of one minute. Use of radioactive coatings, preferably emitters of [[alpha particles]], gives a faster response, attaining relaxation times of the order of a few seconds. Certain mechanical collectors have relaxation times of the order of a few hundredths of a second. <br/>''Compare'' [[impactor]].</div><br/> </div><div class="reference">Chalmers, J. A. 1957. Atmospheric Electricity. 84–92. </div><br/> | <div class="definition"><div class="short_definition">A class of instruments employed to determine the [[electric potential]] at a point in the [[atmosphere]], and ultimately the [[atmospheric electric field]].</div><br/> <div class="paragraph">All collectors consist of some device for rather rapidly bringing a conductor to the same [[potential]] as the air immediately surrounding it, plus some form of [[electrometer]] for measuring the difference in potential between the equilibrated collector and the earth itself. Collectors differ widely in their speed of response to atmospheric potential changes. When a flame is used to increase the local [[ion density|ion density]] and thereby facilitate potential equilibration, some advantage over a simple exposed conductor is gained; the [[relaxation time]] becomes of the order of one minute. Use of radioactive coatings, preferably emitters of [[alpha particles]], gives a faster response, attaining relaxation times of the order of a few seconds. Certain mechanical collectors have relaxation times of the order of a few hundredths of a second. <br/>''Compare'' [[impactor]].</div><br/> </div><div class="reference">Chalmers, J. A. 1957. Atmospheric Electricity. 84–92. </div><br/> | ||
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Latest revision as of 15:40, 25 April 2012
collector
A class of instruments employed to determine the electric potential at a point in the atmosphere, and ultimately the atmospheric electric field.
All collectors consist of some device for rather rapidly bringing a conductor to the same potential as the air immediately surrounding it, plus some form of electrometer for measuring the difference in potential between the equilibrated collector and the earth itself. Collectors differ widely in their speed of response to atmospheric potential changes. When a flame is used to increase the local ion density and thereby facilitate potential equilibration, some advantage over a simple exposed conductor is gained; the relaxation time becomes of the order of one minute. Use of radioactive coatings, preferably emitters of alpha particles, gives a faster response, attaining relaxation times of the order of a few seconds. Certain mechanical collectors have relaxation times of the order of a few hundredths of a second.
Compare impactor.
Compare impactor.
Chalmers, J. A. 1957. Atmospheric Electricity. 84–92.
