Patent US4200399A successfully refreshed from Google Patents.
US4200399A
Expired / Lapsed
US
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Resonant optoacoustic spectroscopy apparatus
Assignee: Motors Liquidation Co
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Filing: 1978-11-20
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Granted: 1980-04-29
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Expires: 1998-11-20
Abstract
Abstract Resonant optoacoustic cells are used in measurements of the concentration and composition of a gas or aerosol. Such apparatus is improved by providing a small absorption cell acoustically coupled to a resonant acoustic cavity so that the time delay associated with the flow of a gas or aerosol through the absorption cell is greatly reduced.
Inventors
- 👤 Harry J. Kimble
- 👤 David M. Roessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:47
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/1702; G01N2021/1704
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
An optoacoustic spectroscopy apparatus having a fast response time to constituent changes in a flowing or stationary gas comprising a resonant chamber dimensioned to have a fundamental acoustic resonance frequency below 10 kHz, an absorption cell having dimensions substantially smaller than the resonant chamber and acoustically coupled to the resonant chamber, the absorption cell having inlet and outlet ports to accommodate the flow of gas therethrough, means for irradiating the absorption cell contents with periodic pulses of radiation absorbed by a constituent of the gas to produce corresponding pressure variations in the cell, the radiation being pulsed at a resonant frequency of the resonant chamber whereby pressure oscillations at said resonant frequency are produced in the absorption cell and coupled to the resonant chamber where corresponding pressure oscillations of increased magnitude are induced, and means coupled with the resonant chamber to measure the pressure oscillations therein and produce an electrical output which is a measure of the radiation absorbing constituent in the absorption chamber.
Claim 2
Dependent Claim
164 words
An optoacoustic spectroscopy apparatus having a fast response time to constituent changes in a flowing or stationary gas comprising a resonant chamber dimensioned to have a fundamental acoustic resonance frequency below 10 kHz, an absorption cell having dimensions substantially smaller than the resonant chamber and acoustically coupled to the resonant chamber, the absorption cell having inlet and outlet ports to accommodate the flow of gas therethrough, means for irradiating the absorption cell contents with periodic pulses of radiation absorbed by a constituent of the gas to produce corresponding pressure variations in the cell, the radiation being pulsed at a resonant frequency of the resonant chamber whereby pressure oscillations at said resonant frequency are produced in the absorption cell and coupled to the resonant chamber where corresponding pressure oscillations of increased magnitude are induced, and means coupled with the resonant chamber to measure the pressure oscillations therein and produce an electrical output which is a measure of the radiation absorbing constituent in the absorption chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |