METHOD AND DEVICE FOR MEASURING CONCENTRATION OF SUBSTANCE IN FLUID

摘要

A method and device for measuring a substance's concentration in a fluid. The method includes first passing a sample to be measured through a chemical sensor at least twice and recording the response value each time; forming a simultaneous equation set using the equation relation between the response value obtained during each measurement and the concentration of the substance, and the mass equation relation satisfied by the concentration change caused by a physical, chemical reaction during each measurement and by the change of the mass, electric quantity, and heat; solving for the concentration of the substance measured and the sensor calibration parameter. The method, used as an absolute measurement method, can be applied to calibrate the sample concentration of a fluid, overcomes the effects on the measurements caused by temperature, humidity, pressure, and some interfering gas, requires no sensor calibration, and substantially enhances the measurements' stability and reliability.

主权项

1. A method for measuring material concentration in a fluid,
wherein: driving a sample to be tested to pass through a chemical sensor at least twice, logging the response value of the chemical sensor in each time; establishing a simultaneous system of equations from the measurement equation relationship between the response values of the sensor obtained by the chemical sensor in each measurement cycle and the material concentration and the mass equation relationship between the change of material concentration resulted from physical and chemical reactions in each measurement cycle and the change of mass, electric quantity, and heat in the reactions, and solving the simultaneous system of equations to ascertain the concentration of the tested material and the calibration parameters of the sensor.