Compact design for real time in situ atmospheric trace gas detection based on mirage effect (photothermal deflection) spectroscopy

1996 ◽  
Vol 67 (5) ◽  
pp. 1891-1895 ◽  
Author(s):  
B. Zimering ◽  
A. C. Boccara
Keyword(s):  
Real Time ◽  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection ◽  
Mirage Effect ◽  
Photothermal Deflection Spectroscopy ◽  
Photothermal Deflection ◽  
Compact Design ◽  
Atmospheric Trace Gas

Photoacoustic spectroscopy for trace gas detection with cryogenic and room-temperature continuous-wave quantum cascade lasers

Open Physics ◽  
2010 ◽  
Vol 8 (2) ◽  
Author(s):  
Virginie Zeninari ◽  
Agnès Grossel ◽  
Lilian Joly ◽  
Thomas Decarpenterie ◽  
Bruno Grouiez ◽  
...  
Keyword(s):  
Detection Limit ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Gas Detection ◽  
Trace Gas ◽  
Atmospheric Gases ◽  
Trace Gas Detection ◽  
Quantum Cascade ◽  
Cascade Lasers

AbstractThe main characteristics that a sensor must possess for trace gas detection and pollution monitoring are high sensitivity, high selectivity and the capability to perform in situ measurements. The photacoustic Helmholtz sensor developed in Reims, used in conjunction with powerful Quantum Cascade Lasers (QCLs), fulfils all these requirements. The best cell response is # 1200 V W−1 cm and the corresponding ultimate sensitivity is j 3.3 × 10−10 W cm−11 Hz−11/2. This efficient sensor is used with mid-infrared QCLs from Alpes Lasers to reach the strong fundamental absorption bands of some atmospheric gases. A first cryogenic QCL emitting at 7.9 μm demonstrates the detection of methane in air with a detection limit of 3 ppb. A detection limit of 20 ppb of NO in air is demonstrated using another cryogenic QCL emitting in the 5.4 μm region. Real in-situ measurements can be achieved only with room-temperature QCLs. A room-temperature QCL emitting in the 7.9 μm region demonstrates the simultaneous detection of methane and nitrous oxide in air (17 and 7 ppb detection limit, respectively). All these reliable measurements allow the estimated detection limit for various atmospheric gases using quantum cascade lasers to be obtained. Each gas absorbing in the infrared may be detected at a detection limit in the ppb or low-ppb range.

scholarly journals A fiber-tip photoacoustic sensor for in situ trace gas detection

2019 ◽  
Vol 90 (2) ◽  
pp. 023102 ◽  
Author(s):  
Sheng Zhou ◽  
Davide Iannuzzi
Keyword(s):  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection

A broadband absorption spectrometer using light emitting diodes for ultrasensitive, in situ trace gas detection

2008 ◽  
Vol 79 (12) ◽  
pp. 123110 ◽  
Author(s):  
Justin M. Langridge ◽  
Stephen M. Ball ◽  
Alexander J. L. Shillings ◽  
Roderic L. Jones
Keyword(s):  
Light Emitting Diodes ◽  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection ◽  
Light Emitting ◽  
Broadband Absorption ◽  
Absorption Spectrometer
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