US4067320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for drift compensation in a gas analyzer
Assignee: Siemens AG
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Filing: 1976-04-30
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Granted: 1978-01-10
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Expires: 1996-04-30
Abstract
Abstract An arrangement for automatic drift compensation in a gas analyzer in which a source of radiation radiates through the gas to be analyzed, and directs the radiation onto a detector. The latter forms an amplified output signal corresponding to the detector output and corresponding to the gas concentration. A signal storage stores the signal corresponding to the output signal of the detector when the gas to be analyzed has a predetermined concentration. A comparator compares the output signal from the detector with the stored signal. The gas analyzer is used for determining the content of a predetermined gas in a mixture of gases exhaled by a patient. A circuit connected between the detector output and the comparator input delivers to the storage a signal during the inspiration phase of the patient.
Inventors
- 👤 Sven-Gunnar Olsson
- 👤 Rolf Castor
- 👤 Gabriel Tchang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:12
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/497; G01N33/4972; A; A61; A61B; A61B5/00; A61B5/08; A61B5/083; A61B5/0836; G01N21/00; G01N21/17; G01N21/25; G01N21/27; G01N21/274
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
An arrangement for automatic drift compensation in a gas analyzer for detemining the content of a specific gas contained in a gas mixture exhaled by a patient, said arrangement comprising a radiation source for radiating through the gas to be analyzed, a radiation detector onto which the radiation through the gas is directed, circuit means connected to said radiation detector and forming an amplified output signal corresponding to the output of the radiation detector, the output of said radiation detector corresponding to the gas concentration, storage means for storing a signal corresponding to said output signal when the gas to be analyzed has a predetermined concentration, and comparator means connected to said storage means for comparing the output signal from said detector with the signal stored in said storage means, and means connected between the output of the detector and the input of said comparator means for delivering to said storage means the signal corresponding to said output signal during the inspiration phase of a patient.
Claim 2
Dependent Claim
166 words
An arrangement for automatic drift compensation in a gas analyzer for detemining the content of a specific gas contained in a gas mixture exhaled by a patient, said arrangement comprising a radiation source for radiating through the gas to be analyzed, a radiation detector onto which the radiation through the gas is directed, circuit means connected to said radiation detector and forming an amplified output signal corresponding to the output of the radiation detector, the output of said radiation detector corresponding to the gas concentration, storage means for storing a signal corresponding to said output signal when the gas to be analyzed has a predetermined concentration, and comparator means connected to said storage means for comparing the output signal from said detector with the signal stored in said storage means, and means connected between the output of the detector and the input of said comparator means for delivering to said storage means the signal corresponding to said output signal during the inspiration phase of a patient.
Claim 3
Dependent Claim
53 words
The arrangement as defined in claim 1 including means for supplying air to the patient during the inspiration phase, said means connected between the output of the detector and the input of said comparator means comprising a controllable electronic switch with control input connected to said means for supplying air to the patient.
Claim 4
Dependent Claim
45 words
The arrangement as defined in claim 1 with said means connected between the output of the detector and the input of said comparator means being responsive to an output signal having a predetermined value to transmit said signal to said storage means for storage thereby.
Claim 5
Dependent Claim
61 words
The arrangement as defined in claim 1 with said storage means comprising capacitor means connected to said means connected between the output of the detector and the input of said comparator means, said means connected between the output of the detector and the input of said comparator means comprising a diode connected for charging said capacitor means during the inspiration phase.
Claim 6
Dependent Claim
72 words
The arrangement as defined in claim 1, including chopper means between said radiation source and said detector in periodically interrupting the radiation from said source to said detector; and rectifier means connected between the output of said detector and the input of said comparator means and said storage means, said rectifier means having an output signal proportional to the output voltage of said detector, the output voltage of said detector being pulse-shaped.
Claim 7
Dependent Claim
14 words
The arrangement as defined in claim 1, wherein said comparator means comprises divider means.
Claim 8
Dependent Claim
33 words
The arrangement as defined in claim 1 including non-linear amplifier means connected to the output of said comparator means and having an output signal directly proportional to the gas concentration to be measured.
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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |