High-reliability method and device for gas concentration measurement

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.