| 摘要 |
PROBLEM TO BE SOLVED: To measure the masses and mixing ratio of substances included in a mixture of three kinds of substances differing in magnetic permeability and electric conductivity even when a measurement object comprises the mixture.SOLUTION: There is provided a mixing ratio measurement method in which, while applying AC signals of four different frequencies to a coil sensor, an output voltage from the coil sensor to the weight of a single substance is measured at each frequency to derive calibration curves from the output voltages of the coil sensor relative to the weight and set up a relational expression. A table comprising numerical data is prepared from the relational expression. In a state in which a measurement object 100 being a mixture of three substances differing in magnetic permeability and electric conductivity, is positioned within a coil sensor 50, output voltages from the coil sensor 50 at four different frequencies are measured by phase detection, and the output voltage at each frequency is measured. On the basis of the four measured output voltages, the closest numerical values are found out from the table, and the weight of each of three different substances is calculated to calculate the mixing ratio. |
