Optical measuring method of expiration components
US5754288A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Aug 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
As to respective expiration components to be measured, wavelengths having excellent correlations between component concentrations and Raman spectral intensity values are previously selected as measuring wavelengths which are specific to the components, an expiration specimen is irradiated with Raman excitation light, Raman spectra at the measuring wavelength which is specific to nitrogen and those at the measuring wavelengths previously selected for the components to be measured respectively are measured, Raman spectral intensity ratios of the components to the Raman spectral intensity of nitrogen are obtained, and the respective expiration components are quantitatively analyzed through a calibration curve which is previously prepared as to the Raman spectral intensity ratios of the respective components to nitrogen and concentrations. It is possible to provide a measuring method utilizing Raman spectroscopy, which can directly determine intra- expiratory components in a short time with no requirement for expendable items.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.