@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @prefix grg: . @prefix iop: . @prefix ns0: . @prefix ns1: . @prefix owl: . @prefix pav: . @prefix prov: . @prefix puv: . @prefix qudt: . @prefix rdf: . @prefix rdfs: . @prefix reg: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . rdf:type skos:Concept ; dce:identifier "SDN:L22::TOOL0101" ; dc:date "2010-11-18 12:39:41.0" ; dc:identifier "SDN:L22::TOOL0101" ; pav:authoredOn "2010-11-18 12:39:41.0" ; pav:hasCurrentVersion ; pav:hasVersion ; pav:version "2" ; void:inDataset ; owl:deprecated "false" ; owl:versionInfo "2" ; skos:altLabel "AA Optode 4175" , "AA Optode 4175"@en ; skos:broader , ; skos:definition "A dissolved oxygen sensor for OEM applications. Measurement based on the ability of selected substances to act as dynamic fluorescence quenchers. The fluorescent indicator is a special platinum porphyrin complex embedded in a gas permeable foil that is exposed to the surrounding water. A black optical isolation coating protects the complex from sunlight and fluorescent particles in the water. This sensing foil is attached to a window providing optical access for the measuring system from inside a watertight titanium housing.The foil is excited by modulated blue light, and the phase of a returned red light is measured. By linearizing and temperature compensating, with an incorporated temperature sensor, the absolute O2 concentration can be determined. Further information may be found on the BODC document server at URL: http://www.bodc.ac.uk/data/documents/nodb/119483/."@en ; skos:inScheme ; skos:notation "SDN:L22::TOOL0101" ; skos:note "accepted"@en ; skos:prefLabel "Aanderaa Oxygen Optode 4175"@en ; skos:related , , , .