PERFORMANCES OF A MID-INFRARED CH_4 DETECTION DEVICE USING AN OPTIMIZED ASYMMETRIC ELLIPSE GAS-CELL

摘要

We demonstrate a mid-infrared CH_4 detection device using a novel fabricated asymmetric ellipse light-collecting gas-cell. Structural optimizations are performed for fast gas-diffusion speed and high detection sensitivity. Detection experiments on standard CH_4 samples show that the detection sensitivity is about 9 ppm within the concentration range 8~1000 ppm, the minimum detection limit is about 8 ppm, and the 10~90% response time is as fast as 6.0 s. This fabricated device with asymmetric gas-cell reveals superior performances to the previous reported device with symmetric gas-cell in our laboratory.