Sub-ppm-Level Ammonia Detection Using Photoacoustic Spectroscopy with an Optical Microphone Based on a Phase Interferometer
A sensitive optical microphone for photoacoustic spectroscopy based on the common path topology of a fibre laser Doppler vibrometer (FLDV) using phase-generated carrier demodulation and a slim diaphragm as an acoustic wave transducer was demonstrated. A resonant gas cell was adapted to enhance gas-d...
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MDPI AG
2019-06-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/19/13/2890 |
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doaj-b90d660e8a084e59b0b0e8b4dc5f341e2020-11-24T22:04:03ZengMDPI AGSensors1424-82202019-06-011913289010.3390/s19132890s19132890Sub-ppm-Level Ammonia Detection Using Photoacoustic Spectroscopy with an Optical Microphone Based on a Phase InterferometerOscar E. Bonilla-Manrique0Julio E. Posada-Roman1Jose A. Garcia-Souto2Marta Ruiz-Llata3Electronics Technology Department, Carlos III University of Madrid, 28911 Leganés, SpainElectronics Technology Department, Carlos III University of Madrid, 28911 Leganés, SpainElectronics Technology Department, Carlos III University of Madrid, 28911 Leganés, SpainElectronics Technology Department, Carlos III University of Madrid, 28911 Leganés, SpainA sensitive optical microphone for photoacoustic spectroscopy based on the common path topology of a fibre laser Doppler vibrometer (FLDV) using phase-generated carrier demodulation and a slim diaphragm as an acoustic wave transducer was demonstrated. A resonant gas cell was adapted to enhance gas-detection performance and simultaneously provide efficient cancellation of the window background acoustic signal. Ammonia (NH<sub>3</sub>) was selected as the target gas. The absorption line was experimentally identified using a distributed feedback laser diode emitting at 1530 nm. The linearity and sensitivity of the gas sensor were measured using wavelength modulation spectroscopy with second harmonic detection. A Teflon diaphragm was used to implement the optical microphone, along with the FLDV, showing a minimum detectable pressure of 79.5 μPa/Hz<sup>1/2</sup>. The noise-equivalent absorption sensitivity for NH<sub>3</sub> detection at the absorption line at 1531.7 nm was 1.85 × 10<sup>−8</sup> W cm<sup>−1</sup> Hz<sup>−1/2</sup>, and the limit of detection was 785 ppbv.https://www.mdpi.com/1424-8220/19/13/2890photoacoustic spectroscopygas detectionoptical microphoneresonant cellmembrane |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Oscar E. Bonilla-Manrique Julio E. Posada-Roman Jose A. Garcia-Souto Marta Ruiz-Llata |
| spellingShingle |
Oscar E. Bonilla-Manrique Julio E. Posada-Roman Jose A. Garcia-Souto Marta Ruiz-Llata Sub-ppm-Level Ammonia Detection Using Photoacoustic Spectroscopy with an Optical Microphone Based on a Phase Interferometer Sensors photoacoustic spectroscopy gas detection optical microphone resonant cell membrane |
| author_facet |
Oscar E. Bonilla-Manrique Julio E. Posada-Roman Jose A. Garcia-Souto Marta Ruiz-Llata |
| author_sort |
Oscar E. Bonilla-Manrique |
| title |
Sub-ppm-Level Ammonia Detection Using Photoacoustic Spectroscopy with an Optical Microphone Based on a Phase Interferometer |
| title_short |
Sub-ppm-Level Ammonia Detection Using Photoacoustic Spectroscopy with an Optical Microphone Based on a Phase Interferometer |
| title_full |
Sub-ppm-Level Ammonia Detection Using Photoacoustic Spectroscopy with an Optical Microphone Based on a Phase Interferometer |
| title_fullStr |
Sub-ppm-Level Ammonia Detection Using Photoacoustic Spectroscopy with an Optical Microphone Based on a Phase Interferometer |
| title_full_unstemmed |
Sub-ppm-Level Ammonia Detection Using Photoacoustic Spectroscopy with an Optical Microphone Based on a Phase Interferometer |
| title_sort |
sub-ppm-level ammonia detection using photoacoustic spectroscopy with an optical microphone based on a phase interferometer |
| publisher |
MDPI AG |
| series |
Sensors |
| issn |
1424-8220 |
| publishDate |
2019-06-01 |
| description |
A sensitive optical microphone for photoacoustic spectroscopy based on the common path topology of a fibre laser Doppler vibrometer (FLDV) using phase-generated carrier demodulation and a slim diaphragm as an acoustic wave transducer was demonstrated. A resonant gas cell was adapted to enhance gas-detection performance and simultaneously provide efficient cancellation of the window background acoustic signal. Ammonia (NH<sub>3</sub>) was selected as the target gas. The absorption line was experimentally identified using a distributed feedback laser diode emitting at 1530 nm. The linearity and sensitivity of the gas sensor were measured using wavelength modulation spectroscopy with second harmonic detection. A Teflon diaphragm was used to implement the optical microphone, along with the FLDV, showing a minimum detectable pressure of 79.5 μPa/Hz<sup>1/2</sup>. The noise-equivalent absorption sensitivity for NH<sub>3</sub> detection at the absorption line at 1531.7 nm was 1.85 × 10<sup>−8</sup> W cm<sup>−1</sup> Hz<sup>−1/2</sup>, and the limit of detection was 785 ppbv. |
| topic |
photoacoustic spectroscopy gas detection optical microphone resonant cell membrane |
| url |
https://www.mdpi.com/1424-8220/19/13/2890 |
| work_keys_str_mv |
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