Contaminant identification and concentration determination by monitoring the temporal characteristics of an intracavity laser
US6075252A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1998 |
| Grant date | Jun 13, 2000 |
| Priority date | — |
| Expiry date | Nov 16, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/391
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for detecting the presence of a specific concentration of gaseous species within a calibrated range in a gas sample are disclosed. The ILS gas detection system of the present invention simply comprises an ILS laser and an optical detector. However, the spectral bandwidth of the ILS laser is preferably entirely included within one of the absorption bands or regions assigned to the intracavity gaseous species being monitored. Thus, within the calibrated range, the presence of the gaseous species changes the temporal characteristics of the ILS laser. Consequently, only a temporal characteristic of the output of the ILS laser need be monitored in order to quantitatively determine the concentration of the absorbing gaseous species when using the ILS method of the present invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.