Method and apparatus for measuring pH of medium solution
US9291572B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 6, 2012 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Oct 14, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0627
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pH measuring method includes: illuminating a medium solution, which includes: a first material; and a second material, with a plurality of light beams, which includes: a first light beam, a wavelength of which corresponds to a first absorption peak; a second light beam, a wavelength of which corresponds to a second absorption peak or a second convergence point; a third light beam, a wavelength of which corresponds to a third absorption peak or a third convergence point; and a fourth light beam, a wavelength of the fourth light beam at which an absorbance of at least one of the first and second materials is converged irrespective of a pH; receiving transmitted or reflected light beams of the first to fourth light beams; measuring absorbances at the wavelengths of the received light beams respectively; and calculating a pH of the medium solution based on the absorbances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.