Near-Infrared Broadband Cavity-Enhanced Spectroscopic Multigas Sensor Using a 1650 nm Light Emitting Diode

• DOI: 10.1021/acssensors.9b00788
• Publication Date: 2019-06-11T09:44:39Z
• Authors: Kaiyuan Zheng; Chuantao Zheng; Ningning Ma; Zidi Liu; Yue Yang; Yu Zhang; Yiding Wang; Frank K. Tittel
• Keywords: Spectroscopy, Near-Infrared; Acetylene; Electrical Equipment and Supplies; Light emitting diode; Equipment Design; Methane detection; 540; 530; 01 natural sciences; 7. Clean energy; Acetylene detection; Limit of Detection; 0103 physical sciences; Infrared absorption spectroscopy; Gas sensor; Methane; Incoherent broadband cavity-enhanced absorption spectroscopy

A near-infrared broadband cavity-enhanced sensor system was demonstrated for the first time using an energy-efficient light emitting diode (LED) with a central emission wavelength at 1650 nm and power of ∼16 mW. portable absorption gas cell designed realizing compact stable optical easy alignment. An ultrashort 8-cm-long cavity fabricated consisting two mirrors ∼99.35% reflectivity. Methane (CH4) measurement performed employing detection schemes, i.e., NIRQuest InGaAs spectrometer scanning monochromator combined phase-sensitive detection. Retrieval CH4 concentration least-squares fitting algorithm. Sensitivities (i.e., minimum detectable coefficient) were achieved 1.25 × 10–6 cm–1 averaging 45 s 1.85 8 min in combination lock-in Field monitoring leakage spectrometer. Multigas sensing acetylene (C2H2) carried out simultaneously high-resolution linear response retrieved level versus nominal value observed large dynamic range, demonstrating reliability LED-based spectroscopy (NIR-IBBCEAS) multigas applications.