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G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
G01N21/716—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited by measuring the radiation emitted by a test object treated by combustion gases for investigating the composition of gas mixtures
Elektrischer Gaspruefer, bei welchem die Widerstandsaenderungen eines vom Pruefgas umspuelten Messdrahtes und eines in einem Vergleichsgas befindlichen zweiten Messdrahtes gemessen werden
Vorrichtung zum Feststellen von Methan oder anderen Kohlenwasserstoffen in der Luft,insbesondere in Gruben, auf Grundlage der Verbrennung des Methans an einem Gluehfadenaus katalytischem Metall
Verfahren zur Verwendung der photochemischen Reaktion eines durch Elektrolyse einer Fluessigkeit erzeugten lichtempfindlichen Gasgemisches zur Herstellung eines Lichtrelas und Ausfuehrungsformen derartiger Lichtrelais