High-reliability method and device for gas concentration measurement

Abstract

The invention relates to a high-reliability method and a device for gas concentration measurement. The method includes: presetting a scene parameter range threshold and a corresponding scene infrared source power value; system zeroing, completing gas concentration measurement within preset device measurement time, and comparing the obtained real-time scene parameter value with the preset scene parameter range threshold; backing if the obtained real-time scene parameter value is not within the preset scene parameter range threshold; and if the obtained real-time scene parameter value is within the preset scene parameter range threshold, operating at a corresponding scene infrared source power, acquiring a calculation zero point, acquiring, analyzing and calculating infrared signals within the preset measurement time, and backing after gas concentration measurement within the preset measurement time is completed. Using the method can flexibly adjust driving power of an infrared source according to different application scenes, the service life of the infrared source is effectively prolonged while system measurement requirements are met, long-term stability of the system is improved, and system power consumption and hardware cost are reduced.

Description

technical field [0001] The invention relates to the technical field of medical respiratory gas concentration measurement, in particular to a highly reliable gas concentration measurement method and device using infrared spectroscopy. Background technique [0002] Respiratory gas concentration detection in the medical field can be analyzed with a variety of different measurement principles. Common detection methods use non-spectral infrared methods to isolate the absorption properties of gas samples. The detected respiratory gases include carbon dioxide, laughing gas N2O, anesthetic gases, etc. The measurement principle is that a specific gas absorbs infrared energy of a specific wavelength; and the greater the concentration of the gas, the more it absorbs infrared light. For example, the absorption peaks of carbon dioxide and nitrous oxide are in the infrared band of 4-5 microns, while the absorption peaks of anesthetic gases (halothane, enflurane, isoflurane, sevoflurane,...

AI Technical Summary

Problems solved by technology

[0004] For methods or devices using infrared light to measure gas concentration, the working life of infrared light source has always been an important obstacle restricting the improvement of its reliability

In addition, the aging of the infrared light source or the aging of the detector leads to serious attenuation of the detected infrared light signal and a decrease in the signal-to-noise ratio of the measurement syste

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