System and method for performing heater-less lead selenide-based capnometry and/or capnography

摘要

A sensor device to detect a level of carbon dioxide in a body of gas includes one or more lead selenide detectors as infrared sensing elements. The sensor device operates without temperature regulation required by conventional lead selenide-based sensors, and instead measurements of the sensor device are compensated for a temperature measured by a thermal sensor.

主权项

1. A sensor device configured to measure a level of carbon dioxide in a body of gas, the sensor device comprising:
a radiation source configured to emit electromagnetic radiation through a body of gas; a sensor comprising a first lead selenide detector configured to allow the electromagnetic radiation emitted by the radiation source that has passed through the body of gas to become incident on the first lead selenide detector, the sensor being further configured to generate a first signal conveying information related to an intensity of electromagnetic radiation incident on the first lead selenide detector; a processor configured to determine the level of carbon dioxide in the body of gas based on the first signal generated by the sensor; and a first thermal sensor that is discrete from the first lead selenide detector and is configured to output a first temperature signal conveying information related to a temperature of the first lead selenide detector, wherein the processor is further configured to determine the level of carbon dioxide further based on a compensation for the temperature of the first lead selenide detector as reflected in the first temperature signal by compensating the first signal directly provided to the processor from the sensor.