Method and apparatus for measuring concentration of a solution using pathlength complementally modulated cells
US5387971A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Sep 7, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/534
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for measuring concentration of a solution use pathlength complementarily modulated cells comprising a sample cell and a reference cell arranged in parallel to each other and separated by a displacable separator window which is displaced parallelly in a direction of an optical axis of a measuring optical system thereby varying each of cell-length of sample and reference cells complementarily, detect transmitted intensities by the combined cells at different positions of the separator window while flowing a sample solution and a reference solution having a known concentration into the sample cell and reference cell, respectively, and calculate the concentration of the sample solution based on detected transmitted intensities, positions of the separator window at which transmitted intensities are detected and the known concentration of the reference solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.