Resonant spectrophone system noise elimination
US4412445A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1981 |
| Grant date | Nov 1, 1983 |
| Priority date | — |
| Expiry date | Aug 27, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/103
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A resonant spectrophone system has a laser arranged to direct a laser beam into a chamber containing gas to be analyzed wherein absorption data relative to the gas constituents is obtained by detecting pressure variations within the chamber. The laser is operated such that the laser beam passing through the chamber generates a resonant wave therein. Pressure variations within the chamber are monitored at locations corresponding to nodal and/or peak points of the resonant wave. The nodal point signals represent background noise and are subtracted from the peak point signals to remove noise components from the peak point signals or out-of-phase nodal signals are subtracted to perform this function and thereby yield signals which more accurately represent the absorption data relative to the gas constituents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.