Off-beam QEPAS sensor using an 11-μm DFB-QCL with an optimized acoustic resonator | Zendy

Roman Rousseau | Zendy; Zeineb Loghmari | Zendy; M. Bahriz | Zendy; Kaïm Chamassi | Zendy; R. Teissier | Zendy; А. Н. Баранов | Zendy; A. Vicet | Zendy

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Off-beam QEPAS sensor using an 11-μm DFB-QCL with an optimized acoustic resonator

Author(s) -

Roman Rousseau,

Zeineb Loghmari,

M. Bahriz,

Kaïm Chamassi,

R. Teissier,

А. Н. Баранов,

A. Vicet

Publication year - 2019

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.27.007435

Subject(s) - photoacoustic spectroscopy , quantum cascade laser , optics , materials science , resonator , microphone , photoacoustic effect , time delay and integration , microelectromechanical systems , optoelectronics , beam (structure) , laser , acoustics , physics , sound pressure

An off-beam quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor was designed for ethylene detection using a distributed-feedback quantum cascade laser (QCL) operating in the mid-infrared around 11 μm. The acoustic microresonator configuration was experimentally optimized using an original open-cell photoacoustic setup with a MEMS microphone. Correction factors based on theoretical acoustic models were introduced in order to accurately describe the response of millimeter-sized acoustic resonators. The optimized QEPAS sensor exhibited a limit of detection of 60 ppb for 60 s integration, giving a NNEA of 4.8 × 10 -8 W·cm -1 ·Hz -0.5 .

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