Patent ID: 6239600
Filing Date: 2001-05-29
Classification: G01N

Abstract:
A microwave type concentration measuring apparatus designed to find an overall concentration of a mixed fluid body stream comprising:at least one sensitivity measurement microwave type concentration meter attached on an outer wall of a supply stream containing a single substance having a varying constituent composition for measuring a measurement sensitivity of a single substance having a varying constituent composition;a mixed fluid body stream microwave type concentration meter attached on the outer wall of a mixed fluid body stream for measuring an uncorrected concentration of said mixed fluid body stream, wherein the mixed fluid body stream microwave type concentration meter has a means to calculate a phase lag differential between a first phase lag, .theta..sub.1, of microwaves diffused by a reference liquid and a second phase lag, .theta..sub.2 of microwaves which have been diffused by the mixed fluid body stream; anda calibration curve gradient setting device for setting a correction gradient for a calibration curve for the mixed fluid body stream based on the measurement sensitivity of the single substance having a varying constituent composition and the calculated phase lag differential.2.The microwave type concentration measuring apparatus according to claim 1 wherein said calibration curve gradient setting device further comprises a computing device that calculates a relationship between said measurement sensitivity of said single substance and said phase lag differential.