Research on an Ultra Low Power Consumption Methane Detection System Based on Nondispersive Infrared (NDIR) Technology
Qingchuan Zhao
In order to meet the needs of low power consumption methane detection technology, an ultra low power consumption infrared methane sensor and system based on non-dispersed infrared spectroscopy is developed. It is based on the characteristics of methane gas molecules which have a main absorption peak in the infrared band of 3.2 to 3.4 μm. Based on the analysis of the principle of infrared differential detection, the anti-interference of water vapour led light source, measuring and reference photodiode (PD) devices selection and sampling chamber light path design are mainly studied. The power consumption of infrared methane sensor is reduced to 10 mW by using a light emitting diode (LED) packets of pulses current drive technology. The influence of temperature change on the measurement of methane concentration is studied, and the temperature compensation algorithm formula is obtained by data analysis and the linear fitting of normalization method. The performance experiment is carried out on the detection system platform, and the basic performance parameters are given. The system has the advantages of low power consumption, anti-interference of water vapour and good detection stability, and has important application value.
Keywords: Photodiode (PD), light emitting diode (LED), methane detection, infrared absorption spectrum, packets of pulses current drive, temperature compensation, ultra low power consumption