Patent ID: 9304088
Filing Date: 2016-04-05
CPC Classification: C12M,G01N

Claim Text:
1. A method of measuring a pH of a solution comprising: emitting light beams of two wavelengths from one side of a measuring region of a solution into which an indicator is mixed, while pulsating the solution in the measuring region; receiving at least one of transmitted light beams and reflected light beams of the emitted light beams on the other side of the measuring region, while pulsating the solution in the measuring region; obtaining absorbances of the two wavelengths based on variations of the received at least one of the transmitted light beams and the reflected light beams, the variations due to the pulsation of the solution in the measuring region; obtaining an absorbance ratio from the obtained absorbances; and calculating a pH value of the solution based on the obtained absorbance ratio and an absorbance ratio/pH value correspondence database which is previously stored.