NDIR interference control in liquids
US9726601B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2017 |
| Grant date | Aug 8, 2017 |
| Priority date | — |
| Expiry date | May 12, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0696
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
NDIR is used to determine a concentration of a chosen molecule M in a liquid sample which contains one or more interfering molecules MJ which absorb radiation at the signal wavelength used in the NDIR process by addition of an interference source. M is calculated by electronics which use Rave(t) from a pulsed signal and reference channel output and a calibration curve which is validated by use of RJave(t2) from a pulsed interference and reference channel output. Signal, interference and reference sources are pulsed at a frequency which is sufficiently fast so that a given molecule of M or MJ will not pass in and out of the liquid sampling matrix within the pulsing frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.