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US 4,067,320 AGranted
Arrangement for drift compensation in a gas analyzer
AssigneeSiemens Aktiengesellschaft
InventorsSven-Gunnar Olsson, Rolf Castor, Gabriel Tchang
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AssigneeSiemens Aktiengesellschaft
InventorsSven-Gunnar Olsson, Rolf Castor, Gabriel Tchang
Estimating the term…
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.
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.
Dependencies are inferred from the claim text.