Miniature low-power IR monitor for methane detection

作者：Liu Jun; Tan Qiulin^*; Zhang Wendong; Xue Chenyang; Guo Tao; Xiong Jijun

来源：Measurement, 2011, 44(5): 823-831.

DOI：10.1016/j.measurement.2011.01.021

• Infrared
• Gas detection
• Portable
• Compensation
• Methane

A portable methane gas monitor based on an infrared spectrum absorption principle has been developed using a dual-channel and dual-wavelength pyroelectric infrared detector, active filters around the overtone absorption lines of methane at 3.31 mu m, reference filters around the non-absorption lines of methane at 3.93 mu m, mid-IR LEDs, a miniature gold-filled cell structure, temperature sensors for gas concentration calibration and compensation, an electrical modulation source, and a highly integrated intelligent controller. A detailed investigation has been carried out to design a low-cost portable IR optical sensor for methane detection that can operate in harsh environments with temperature variations between -10 degrees C and 40 degrees C. The infrared detection optics principle used in developing this system is mainly analyzed. A prototype based on this design showed an accuracy of +/- 0.05%, which meets the technology requirements of lower-power consumption, reduced volume, and wide measurement range.

• 出版日期2011-6
• 单位中北大学