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

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 Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

2019 ◽  
Vol 9 (2) ◽  
pp. 338 ◽  
Author(s):  
Zhenhui Du ◽  
Shuai Zhang ◽  
Jinyi Li ◽  
Nan Gao ◽  
Kebin Tong
Keyword(s):  
Absorption Spectroscopy ◽  
Gas Sensing ◽  
Tunable Laser ◽  
Gas Detection ◽  
Trace Gas ◽  
Spectroscopic Techniques ◽  
Trace Gas Detection ◽  
Absorption Bands ◽  
Mid Infrared ◽  
Broadband Absorption

The vast majority of gaseous chemical substances exhibit fundamental rovibrational absorption bands in the mid-infrared spectral region (2.5–25 μm), and the absorption of light by these fundamental bands provides a nearly universal means for their detection. A main feature of optical techniques is the non-intrusive in situ detection of trace gases. We reviewed primarily mid-infrared tunable laser-based broadband absorption spectroscopy for trace gas detection, focusing on 2008–2018. The scope of this paper is to discuss recent developments of system configuration, tunable lasers, detectors, broadband spectroscopic techniques, and their applications for sensitive, selective, and quantitative trace gas detection.

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

scholarly journals Technical Note: Using a high finesse optical resonator to provide a long light path for differential optical absorption spectroscopy: CE-DOAS

2010 ◽  
Vol 10 (8) ◽  
pp. 3901-3914 ◽  
Author(s):  
J. Meinen ◽  
J. Thieser ◽  
U. Platt ◽  
T. Leisner
Keyword(s):  
Optical Absorption ◽  
Light Source ◽  
Absorption Spectroscopy ◽  
Light Emitting Diode ◽  
Gas Detection ◽  
Trace Gas ◽  
In Situ Observation ◽  
Light Path ◽  
Trace Gas Detection ◽  
Light Emitting

Abstract. Cavity enhanced methods in absorption spectroscopy have seen a considerable increase in popularity during the past decade. Especially Cavity Enhanced Absorption Spectroscopy (CEAS) established itself in atmospheric trace gas detection by providing tens of kilometers of effective light path length using a cavity as short as 1 m. In this paper we report on the construction and testing of a compact and power efficient light emitting diode based broadband Cavity Enhanced Differential Optical Absorption Spectrometer (CE-DOAS) for in situ observation of atmospheric NO3. This device combines the small size of the cavity with the advantages of the DOAS approach in terms of sensitivity, specificity and insensivity to intensity fluctuations of the light source. In particular, no selective removal of the analyte (here NO3) is necessary for calibration of the instrument if appropriate corrections are applied to the CEAS theory. Therefore the CE-DOAS technique can – in principle – measure any gas detectable by DOAS. We will discuss the advantages of using a light emitting diode (LED) as light source particularly the precautions which have to be considered for the use of LEDs with a broad wavelength range. The instrument was tested in the lab by detecting NO3 formed by mixing of NO2 and O3 in air. It was then compared to other trace gas detection techniques in an intercomparison campaign in the atmosphere simulation chamber SAPHIR at Forschungszentrum Jülich at NO3 concentrations as low as 6.3 ppt.

scholarly journals Using a high finesse optical resonator to provide a long light path for differential optical absorption spectroscopy: CE-DOAS

2008 ◽  
Vol 8 (3) ◽  
pp. 10665-10695 ◽  
Author(s):  
J. Meinen ◽  
J. Thieser ◽  
U. Platt ◽  
T. Leisner
Keyword(s):  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Light Emitting Diode ◽  
Gas Detection ◽  
Trace Gas ◽  
Light Path ◽  
Trace Gas Detection ◽  
Light Emitting ◽  
Detection Techniques ◽  
Enhanced Absorption

Abstract. Cavity enhanced methods in absorption spectroscopy have seen a considerable increase in popularity during the past decade. Especially Cavity Enhanced Absorption Spectroscopy (CEAS) established itself in atmospheric trace gas detection by providing tens of kilometers of effective light path length using a cavity as short as 1 m. In this paper we report on the construction and testing of a compact and power efficient light emitting diode based broadband Cavity Enhanced Differential Optical Absorption Spectrometer (CE-DOAS) for in situ field observation of atmospheric NO3. This device combines the small size of the cavity with the enormous advantages of the DOAS approach in terms of sensitivity and specificity. In particular, no selective removal of the analyte (here NO3) is necessary, thus the CE-DOAS technique can – in principle – measure any gas detectable by DOAS. We will discuss the advantages of using a light emitting diode (LED) as light source particularly the precautions which have to be satisfied for the use of LEDs. The instrument was tested in the lab by detecting NO3 in a mixture of NO2 and O3 in air. It was then compared to other trace gas detection techniques in an intercomparison campaign in the atmosphere simulation chamber SAPHIR at NO3 concentrations as low as 6.3 ppt.

scholarly journals Dimension control of in situ fabricated CsPbClBr2 nanocrystal films toward efficient blue light-emitting diodes

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Chenhui Wang ◽  
Dengbao Han ◽  
Junhui Wang ◽  
Yingguo Yang ◽  
Xinyue Liu ◽  
...  
Keyword(s):  
Quantum Well ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Light Emitting ◽  
Mixed Ligands ◽  
Dimension Control ◽  
Nanocrystal Films ◽  
Width Distribution ◽  
Quantum Well Width

AbstractIn the field of perovskite light-emitting diodes (PeLEDs), the performance of blue emissive electroluminescence devices lags behind the other counterparts due to the lack of fabrication methodology. Herein, we demonstrate the in situ fabrication of CsPbClBr2 nanocrystal films by using mixed ligands of 2-phenylethanamine bromide (PEABr) and 3,3-diphenylpropylamine bromide (DPPABr). PEABr dominates the formation of quasi-two-dimensional perovskites with small-n domains, while DPPABr induces the formation of large-n domains. Strong blue emission at 470 nm with a photoluminescence quantum yield up to 60% was obtained by mixing the two ligands due to the formation of a narrower quantum-well width distribution. Based on such films, efficient blue PeLEDs with a maximum external quantum efficiency of 8.8% were achieved at 473 nm. Furthermore, we illustrate that the use of dual-ligand with respective tendency of forming small-n and large-n domains is a versatile strategy to achieve narrow quantum-well width distribution for photoluminescence enhancement.

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