scholarly journals Sup-ppb ammonia detection based on photoacoustic spectroscopy

2005 ◽  
Author(s):  
Jean P. Besson ◽  
Stephane Schilt ◽  
Luc Thevenaz
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Ammonia Detection

Ultra-sensitive ammonia detection for industrial applications using photoacoustic spectroscopy

2002 ◽  
Author(s):  
Michael Webber ◽  
Michael B. Pushkarsky ◽  
Ohan Baghdassarian ◽  
L. Ravi Narasimhan ◽  
C. Kumar N. Patel
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Industrial Applications ◽  
Ammonia Detection

Ultra-sensitive ambient ammonia detection using CO2-laser-based photoacoustic spectroscopy

2003 ◽  
Vol 77 (4) ◽  
pp. 381-385 ◽  
Author(s):  
M.B. Pushkarsky ◽  
M.E. Webber ◽  
C.K.N. Patel
Keyword(s):  
Co2 Laser ◽  
Photoacoustic Spectroscopy ◽  
Ammonia Detection

Carbon dioxide and ammonia detection using 2 μm diode laser based quartz-enhanced photoacoustic spectroscopy

2006 ◽  
Vol 87 (1) ◽  
pp. 157-162 ◽  
Author(s):  
R. Lewicki ◽  
G. Wysocki ◽  
A.A. Kosterev ◽  
F.K. Tittel
Keyword(s):  
Carbon Dioxide ◽  
Diode Laser ◽  
Photoacoustic Spectroscopy ◽  
Ammonia Detection

Ammonia detection by using quantum-cascade laser photoacoustic spectroscopy

2006 ◽  
Vol 45 (20) ◽  
pp. 4966 ◽  
Author(s):  
Milton B. Filho ◽  
Marcelo G. da Silva ◽  
Marcelo S. Sthel ◽  
Delson U. Schramm ◽  
Helion Vargas ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Photoacoustic Spectroscopy ◽  
Quantum Cascade ◽  
Laser Photoacoustic Spectroscopy ◽  
Ammonia Detection

scholarly journals Sub-ppm-Level Ammonia Detection Using Photoacoustic Spectroscopy with an Optical Microphone Based on a Phase Interferometer

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 2890 ◽  
Author(s):  
Oscar E. Bonilla-Manrique ◽  
Julio E. Posada-Roman ◽  
Jose A. Garcia-Souto ◽  
Marta Ruiz-Llata
Keyword(s):  
Absorption Line ◽  
Photoacoustic Spectroscopy ◽  
Limit Of Detection ◽  
Second Harmonic ◽  
Laser Doppler Vibrometer ◽  
Fibre Laser ◽  
Harmonic Detection ◽  
Common Path ◽  
Ammonia Detection ◽  
Path Topology

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 (NH3) 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/Hz1/2. The noise-equivalent absorption sensitivity for NH3 detection at the absorption line at 1531.7 nm was 1.85 × 10−8 W cm−1 Hz−1/2, and the limit of detection was 785 ppbv.

Use of the photoacoustic spectroscopy in the investigation of biocompatible magnetic fluids

2005 ◽  
Vol 125 ◽  
pp. 27-30 ◽  
Author(s):  
J. G. Santos ◽  
L. B. Silveira ◽  
A. C. Oliveira ◽  
P. C. Morais
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Magnetic Fluids
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