Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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27/00
Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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G01N27/02
by investigating impedance
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G01N27/04
by investigating resistance
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G01N27/14
of an electrically-heated body in dependence upon change of temperature
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G01N27/16
caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
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