US3756068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon dioxide concentration sensor
Assignee: United States Department of the Army
•
Filing: 1971-04-30
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Granted: 1973-09-04
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Expires: 1991-04-30
Abstract
Abstract A flueric gas analyzer is disclosed which permits continuous determination of the percent concentration of a specific gas relative to a carrier gas and which provides an instantaneous indication of the results of the determination. In the device, the mixed gas to be analyzed is passed through two independent, cooled dehumidifiers into two independent flueric oscillators. The frequencies of the two oscillators are fluerically mixed, and the resulting beat frequency is measured and processed to provide an appropriate readout of the desired percent concentration.
Inventors
- 👤 F Villarroel
- 👤 J Joyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011; G01N33/0014
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A gas analyzer comprising: sampling means for sampling a carrier gas and for sampling a mixture of said carrier gas with an unknown concentration of another gas; dehumidifying means coupled to said sampling means for removing excess moisture from said sampled gases; vortex tube means coupled to said dehumidifying means for cooling said sampled gases passing through said dehumidifying means; flueric oscillator means coupled to said dehumidifying means for developing a signal representative of said unknown concentration; and, flueric aspirator means coupled to said flueric oscillator means for drawing said sampled gases through said gas analyzer apparatus; and, flueric signal processing means for processing said signal representative of said unknown concentration.
Claim 2
Dependent Claim
111 words
A gas analyzer comprising: sampling means for sampling a carrier gas and for sampling a mixture of said carrier gas with an unknown concentration of another gas; dehumidifying means coupled to said sampling means for removing excess moisture from said sampled gases; vortex tube means coupled to said dehumidifying means for cooling said sampled gases passing through said dehumidifying means; flueric oscillator means coupled to said dehumidifying means for developing a signal representative of said unknown concentration; and, flueric aspirator means coupled to said flueric oscillator means for drawing said sampled gases through said gas analyzer apparatus; and, flueric signal processing means for processing said signal representative of said unknown concentration.
Claim 3
Dependent Claim
17 words
A gas analyzer as in claim 1, wherein: said dehumidifying means comprises two independent flueric dehumidifier units.
Claim 4
Dependent Claim
18 words
A gas analyzer as in claim 1, wherein: said flueric oscillator means comprises two substantially identical flueric oscillators.
Claim 5
Dependent Claim
22 words
A gas analyzer as in claim 3, wherein: said two substantially identical flueric oscillators are coupled together by a sonic transmission line.
Claim 6
Dependent Claim
20 words
A gas analyzer as in claim 4, wherein: a flueric signal processing system is coupled to said sonic transmission line.
Claim 7
Dependent Claim
18 words
A gas analyzer as in claim 4, wherein: a pressure transducer is mounted in said sonic transmission line.
Claim 8
Dependent Claim
19 words
A gas analyzer as in claim 6, wherein: an electronic signal processing network is coupled to said pressure transducer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |