Patent ID: 8815078
Filing Date: 2014-08-26
Classification: G01N,H01L

Abstract:
1. A pH or concentration measuring method comprising providing an inspection tube whose tip side is provided therein with a first room and whose basal side is provided therein with a second room; locating a first sensor in the first room and a second sensor in the second room, wherein the first sensor is a measurement sensor, the second sensor is a reference sensor, and each of the first and the second sensors comprise an ion sensitive field effect transistor (ISFET); feeding a baseline solution from the basal side of the inspection tube to the inside of the inspection tube so that the baseline solution contacts the second sensor; and injecting a sample solution, which is an object to be measured, into the first room so that the sample solution contacts the first sensor, and an interface is formed between the baseline solution and the sample solution, vibrating the interface between the sample solution and the baseline solution formed in the inspection tube by alternatively forward driving and reverse driving the baseline solution that is fed to the inspection tube.