HUANG Bin1, WANG Ying1, WANG Qiang2, LU Qun2, MAO Qihui2

 

(1. Faculty of Mechanical Engineering & Automation, Zhejiang SciTech University, Hangzhou 310018, China;

 

2. Mineral Exploration Institute of Zhejiang Province, Hangzhou 310013, China)

 

 

Abstract: Aiming at the potential safety problems, such as the shallow gas leak and eruption, which exists in the geological exploration and underground construction, the damage and the characteristics of shallow gas were researched, and current methods of shallow gas detection were summarized, a portable shallow gas detector based on the technology of ARM and Linux was designed. The principal components of the shallow gas were methane and carbon dioxide.The gas sensor MH410D and MH440D based on NonDispersive infrared(NDIR) principle were used to detect CH4 and CO2.Data acquisition was carried out through the microprocessor S3C2440 internal ADC unit,the dual channel ADC Linux driver was designed to implement A/D conversion.And the shallow gas concentration data was saved in the backend SQLite database. Qt Creator was used to design the graphical user interface(GUI),which can show realtime concentration, historical data and the data curve respectively. Finally, the flow ratio mixing method was adopted to prepare different standard concentration gases on the shallow gas measurement experimental platform,and the measurement experiment was performed.The experimental results indicate that the detector is stable and reliable, good repeatability, great practicability.

 

Key words: ARM; embedded Linux; shallow gas; NDIR gas sensor; Qt creator