Monochromatic detection of plural rotational Raman spectra generated by multiple frequency excitation
US4008961A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1975 |
| Grant date | Feb 22, 1977 |
| Priority date | — |
| Expiry date | Apr 21, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for spectroscopic gas analysis are provided. Plural beams of monochromatic radiation are directed through gaseous material. A tuning mechanism adjusts the frequency difference between the radiation beams to equal substantially an odd integral submultiple of the frequency difference between adjacent spectral components of the periodic spectrum for a preselected constituent of the gaseous material. Radiation scattered by the gaseous material is received by a filtering mechanism adapted to transmit selectively a detectable signal composed of a single superimposed spectral component of the spectrum. The signal is received by a detecting means which indicates the intensity thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.