Radial and azmuthal non-resonant open-tubular optoacoustic cell
US4688942A · kind A · utility
0Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1985 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Sep 18, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/1704
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radial or azmuthal non-resonant flow-through optoacoustic cell is operated without windows, completely eliminating the window background interference. The cell is constructed of an elongated tube the length of which is 34.times.10.sup.3 cm.times.1/f, where f is the light source modulating frequency and is made of conducting material which is perforated along the center one-half length with holes. A metalized sheath surrounds this center region to form a capacitor microphone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.