Photoacoustic sensor for detecting trace amounts of hydrocarbons in gases or liquids
US11221271B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 2016 |
| Grant date | Jan 11, 2022 |
| Priority date | — |
| Expiry date | Oct 5, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0427
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detector comprises an optical parametric oscillator having a non-linear material adapted to convert via a parametric process pump light into down converted light of two different wavelengths, the first wavelength being longer than the second wavelength. The non-linear material is provided in a down converted wave cavity arranged to resonate only one of the first or second wavelengths. The detector comprises means for modulating light in the down converted wave cavity to induce an acoustic or pressure wave caused by absorption of the resonant one of the first and second wavelengths. The detector further comprises means located in the down-converted wave cavity for detecting the acoustic or pressure wave. The detector may be used for detecting or sensing very low levels of a fluid, for example a gas such as ethane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.