Detection of Ethanol Using a Tunable Interband Cascade Laser at 3.345μm  

作　　者：Hui GAO Liang XIE Ping GONG Hui WANG 

机构地区：[1]State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing100083, China [2]College of Materials Science and Opto-Electronics Technology, University of Chinese Academy of Sciences, Beijing101407, China

出　　处：《Photonic Sensors》2018年第4期303-309,共7页光子传感器（英文版）

摘　　要：With the progress of the laser manufacturing technology, trace gas sensors based on tunable interband cascade lasers （ICLs） and quantum cascade lasers （QCLs） have been widely used to detect organic compounds with high sensitivity. Compared with overtone and combination bands in the near infrared region, for many species, the intensities of fundamental rotational-vibrational absorption bands in the mid-infrared region are much stronger. In this paper, we demonstrate an ethanol sensor using a room-temperature continuous-wave （CW） tunable ICL laser as a light source to detect ethanol vapor concentration with high sensitivity. Combined with the first harmonic （1 f） normalized second harmonic （2f） wavelength modulation spectroscopy （WMS） technology, the characteristics of the harmonics of the system are analyzed, and the amplitude of the first harmonic decrease with an increased concentration of ethanol has been demonstrated both theoretically and experimentally. As a result, a detection limitation of 28 ppb is achieved.With the progress of the laser manufacturing technology, trace gas sensors based on tunable interband cascade lasers （ICLs） and quantum cascade lasers （QCLs） have been widely used to detect organic compounds with high sensitivity. Compared with overtone and combination bands in the near infrared region, for many species, the intensities of fundamental rotational-vibrational absorption bands in the mid-infrared region are much stronger. In this paper, we demonstrate an ethanol sensor using a room-temperature continuous-wave （CW） tunable ICL laser as a light source to detect ethanol vapor concentration with high sensitivity. Combined with the first harmonic （1 f） normalized second harmonic （2f） wavelength modulation spectroscopy （WMS） technology, the characteristics of the harmonics of the system are analyzed, and the amplitude of the first harmonic decrease with an increased concentration of ethanol has been demonstrated both theoretically and experimentally. As a result, a detection limitation of 28 ppb is achieved.

关 键 词：Ethanol sensor interband cascade lasers wavelength modulation spectroscopy 

分 类 号：TN241[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]