Development of VCSEL laser detection system for methane gas

摘要

In this paper, a TDLAS laser gas detection system is developed for CH4 gas. VCSEL laser is used as the core light source in this system, which has the advantages of small volume and low power. In this paper. TDLAS gas detection theory and TDLAS gas detection technology are introduced in detail, focusing on the laser driver circuit. The experimental results show that the system is suitable for the measurement of methane concentration in the range of 90ppm-600ppm, and the error is less than 10%. The minimum detection limit is 90ppm. The system has high stability and accurate measurement results.