| 摘要 |
PROBLEM TO BE SOLVED: To provide a measurement method for achieving a measurement with a specific accuracy by performing operation processing according to an approximation by a polygonal line without excessively making thinner calibration interval. SOLUTION: An input/output characteristic curve DP=f (Ch) of a chemical sensor is divided into a plurality of regions, each region is approximated by a polygonal line, namely (1) DP=an Ch+bn or (2) DP=an logCh+bn , Ch value is inputted in the case of the above expression (1) to obtain the output value DP, and a specific amount of correctionΔDP is added to the output value DP which is obtained by inputting Ch value to the above expression (2) to obtain the output value DP so that the deviation between the input/output characteristic curve DP=f (Ch) of the above chemical sensor and a first-order straight line indicated by the above approximation expression can be corrected as needed in the case of the above expression (2).
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