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 present invention involves the field of medical breathing gas concentration measurement technology, and the gas concentration measurement method and device that uses the infrared spectrum method with high reliability uses high reliability. Background technique [0002] The detection of respiratory gas concentration in the medical field can be analyzed with a variety of different measurement principles.The usual detection method is to use non -split infrared methods to isolate the absorption characteristics of gas samples.The detected respiratory gas includes carbon dioxide, smiling gas N2O, anesthesia gas, etc.Its measurement principle is that a specific gas will absorb the infrared energy of a specific wavelength; and the greater the concentration of the gas, the more absorption of infrared light.For example, the peak of the absorption of carbon dioxide and laughter is in the infrared band of 4-5 microns, while the absorption peak of anesthesia gas (fl...

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 system, which is also the cause of premature failure of the gas concentration measurement device

[0005] At present, the products in the industry tend to increase the cost and use more expensive but more reliable light sources to solve this problem, but there is a lack of an optimized application of infrared light sources method to improve the reliability of the system and prolong the service life of the infrared light source

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