NITROGEN CONCENTRATION MEASUREMENT SYSTEM AND METHOD FOR MEASURING NITROGEN CONCENTRATION

摘要

PROBLEM TO BE SOLVED: To provide a nitrogen concentration measurement system with which it is possible to easily measure the concentration of nitrogen included in a gas.;SOLUTION: Provided is a nitrogen concentration measurement system comprising: a measurement unit 301 for measuring the measured value of an electric signal from a heat generating element that is in contact with a mixed gas to be measured, at each of a plurality of heat generation temperatures; a normalization unit 306 for normalizing the measured values of electric signals so that the values of electric signals from a heat generating element that is in contact with a reference gas not including nitrogen and in contact with a calibration gas are constant irrespective of heat generation temperatures; an expression storage unit 402 for preserving a nitrogen concentration calculation expression where normalized electric signals from heat generating elements at three heat generation temperatures at the least are an independent variable and a nitrogen concentration is a dependent variable; and a nitrogen concentration calculation unit 307 for assigning the measured values of normalized electric signals to the independent variables of the nitrogen concentration calculation expression, and calculating the concentration of nitrogen included in the mixed gas to be measured.;SELECTED DRAWING: Figure 23;COPYRIGHT: (C)2017,JPO&INPIT