A low-cost, high-speed, near-infrared hygrometer

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dc.contributor.author Wilson, A.C. en
dc.contributor.author Barnes, T.H. en
dc.contributor.author Seakins, P.J. en
dc.contributor.author Rolfe, T.G. en
dc.contributor.author Meyer, E.J. en
dc.date.accessioned 2009-09-03T04:39:34Z en
dc.date.available 2009-09-03T04:39:34Z en
dc.date.issued 1995 en
dc.identifier.citation Review of Scientific Instruments 66 (12), 5618-5624. 1995 en
dc.identifier.issn 0034-6748 en
dc.identifier.other eid=2-s2.0-0029136126 en
dc.identifier.uri http://hdl.handle.net/2292/5182 en
dc.description An open access copy of this article is available and complies with the copyright holder/publisher conditions. en
dc.description.abstract We describe a simple near-infrared hygrometer based on a broadband light-emitting diode (LED) centered at 1320 nm. Light from the LED is collimated and passes through a rotating optical-filter assembly and a sample cell. The water vapor concentration is measured using a synchronous detection scheme. This compact and robust instrument has a response time of 0.15 s and can reliably detect short-term absolute humidity changes as small as 0.6 mg/L (which equate to 0.02% absorption); the long-term stability of the absolute humidity measurement over a period of 4 days is approximately 1 mg/L. These performance characteristics are particularly well suited to measurements associated with human respiration, and we present results in this humidity regime. en
dc.publisher American Institute of Physics (AIP) en
dc.relation.ispartofseries Review of Scientific Instruments en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0034-6748/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.source.uri http://dx.doi.org/10.1063/1.1146028 en
dc.title A low-cost, high-speed, near-infrared hygrometer en
dc.type Journal Article en
dc.subject.marsden Fields of Research::240000 Physical Sciences en
dc.identifier.doi 10.1063/1.1146028 en
pubs.issue 12 en
pubs.begin-page 5618 en
pubs.volume 66 en
dc.description.version VoR - Version of Record en
dc.rights.holder Copyright: 1995 American Institute of Physics. en
pubs.end-page 5624 en


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