Photoacoustic gas sensor
US7886576B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2007 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Aug 24, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/1704
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photoacoustic sensor includes a sensor system for photoacoustic detection, at least one noise canceling pressure sensor and a control system in operative connection with the noise canceling pressure sensor to actively cancel the effects of noise in the environment on the sensor system. Another photoacoustic sensor includes a measurement volume, a source of light energy, a photoacoustic pressure sensor, and at least one vibration canceling sensor (for example, a microphone or an accelerometer). A further photoacoustic sensor includes a measurement volume, a source of light energy and a photoacoustic pressure sensor. The measurement volume has an inner surface that is continuously curved over substantially the entire inner surface other than where a window in optical connection with the source of light intersects the measurement volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.