基本信息
摘要：PROBLEM TO BE SOLVED: To obtain an apparatus and a method in which a substance to be measured can be measured stably even when the fluid state of a liquid to be measured is changed by a method wherein the number of vibrations of Karman's vortex generated by a vortex generating body installed on the upstream side is detected, a current derived from a flow velocity is calculated by a calculation means on the basis of the number of vibrations and the current is subtracted from a diffusion current in a flow. SOLUTION: Along a flow passage in which the liquid to be measured flows, a detecting electrode 1 which is used to detect the substance, to be measured, on the basis of the reaction of the electrode with the liquid and a counter electrode 2 which is used as a Karman's vortex generating body are installed inside the flow passage. The counter electrode 2 is formed to be a triangular prism shape, and it is installed in a posture in which one face of the electrode becomes perpendicular to an inflow direction. The detecting electrode-1 which is installed on the downstream side of the counter electrode 2 is formed to be a thin film on a thin piezoelectric element 3 by a printing method or the like, and the piezoelectric element 3 is used as a vibrator. The number of vibrations which are detected by the piezoelectric element 3 is detected by a vibration detection circuit 6, and it is converted into a current value derived from a flow velocity by using a current conversion circuit 10. The current value is substracted from a diffusion current value detected by an electrochemical measuring device 4 in a flow-rate correction circuit 5, and it is corrected automatically.
摘要附图：
