Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7139279 | Sensors and Actuators B: Chemical | 2018 | 14 Pages |
Abstract
A new scheme of fiber-optic cantilever enhanced resonant photoacoustic spectroscopy (CERPAS), combining high sensitive fiber-optic Fabry-Perot cantilever microphone with resonant photoacoustic spectroscopy, is presented for trace gas detection. A fiber-optic cantilever microphone with high sensitivity at the frequency near 1.4â¯kHz is designed to match with a first-order longitudinal resonant photoacoustic cell, whose resonant frequency is 1402â¯Hz. For sensitivity improvement, an erbium-doped fiber amplified near-infrared laser, with the central wavelength of 1532.83â¯nm and the maximum output power of 1â¯W, is used as the light source for acoustic excitation. The trace acetylene detection experiment demonstrates that, with the wavelength modulation spectrum and second-harmonic detection methods, the gas detection limit is achieved to be 80â¯ppt, which is at least one order of magnitude improvement compared with other photoacoustic acetylene sensors reported so far.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Ke Chen, Qingxu Yu, Zhenfeng Gong, Min Guo, Chao Qu,