Automated acousto-optic infra-red analyzer system for monitoring stack emissions
US4652756A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1985 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | May 20, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/536
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved automated acousto-optic analyzer system includes an acousto-optic tunable filter which is coupled with a source of radiation to produce pulsed light at predetermined wavelengths. This light is transmitted through a gas stack containing gases to be analyzed, to a distant detector. The configuration of the acousto-optic tunable filter, radiation source on one side of an environment of interest and a detector on the opposite side of an environment of interest produces spatial separation of the tuned, diffracted light from the undiffracted broad spectrum of the light source at the detector. This configuration eliminates the need for polarizers in the system. It also combines the tuning function of the AOTF with a chopping function, allowing extraneous radiation to be discriminated against. Thus the improved configuration of the disclosed invention permits effective operation of the gas analysis system in a gas stack characterized by extremely high ambient temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.