Micromachined integrated opto-flow gas/liquid sensor
US5869749A · kind A · utility
36Cited by
5References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1997 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | Apr 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/1704
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A micromachined integrated opto-fluidic or opto-acoustic sensor having a rapidly intensity-varying or pulsing light source, an interference filter, a gas cavity, which may or may not be an optical and/or acoustic resonator tuned to a particular wavelength of light, or sound frequency, into which the detected gas can diffuse into via a filter, and a fluidic or pressure sensor to detect the heating and cooling, and the resulting expansion and contraction of the gas due to the absorption of light at the particular wavelength by the specific gas being detected. The presence of other gases is inferred from the detected gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.