scholarly journals A Quantum Cascade Laser-Based Multi-Gas Sensor for Ambient Air Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1850 ◽  
Author(s):  
Andreas Genner ◽  
Pedro Martín-Mateos ◽  
Harald Moser ◽  
Bernhard Lendl
Keyword(s):  
Quantum Cascade Laser ◽  
Ambient Air ◽  
Air Monitoring ◽  
Light Sources ◽  
Processing Unit ◽  
Gas Cell ◽  
Optical Components ◽  
Quantum Cascade ◽  
Ambient Air Monitoring ◽  
The Individual

A quantum cascade laser-based sensor for ambient air monitoring is presented and five gases, affecting the air quality, can be quantified. The light sources are selected to measure CO, NO, NO2, N2O and SO2. The footprint of the measurement setup is designed to fit in two standard 19” rack (48 cm × 65 cm) with 4 height units (18 cm) whereas one is holding the optical components and the other one contains the electronics and data processing unit. The concentrations of the individual analytes are measured using 2f-Wavelength Modulation Spectroscopy (2f-WMS) and a commercially available multipass gas cell defines the optical path. In addition, CO can also be measured with a dispersion-based technique, which allows one to cover a wider concentration range than 2f-WMS. The performance of this prototype has been evaluated in the lab and detection limits in the range of 1ppbv have been achieved. Finally, the applicability of this prototype for ambient air monitoring is shown in a five-week measurement campaign in cooperation with the Municipal Department for Environmental Protection (MA 22) of Vienna, Austria.

scholarly journals The National Ambient Air Monitoring Strategy: Rethinking the Role of National Networks

2009 ◽  
Vol 59 (5) ◽  
pp. 579-590 ◽  
Author(s):  
Richard D. Scheffe ◽  
Paul A. Solomon ◽  
Rudolf Husar ◽  
Tim Hanley ◽  
Mark Schmidt ◽  
...  
Keyword(s):  
Ambient Air ◽  
Air Monitoring ◽  
Monitoring Strategy ◽  
Ambient Air Monitoring ◽  
National Networks

scholarly journals The TOMPs ambient air monitoring network – Continuous data on UK air quality for over 20 years

2016 ◽  
Vol 217 ◽  
pp. 42-51 ◽  
Author(s):  
Carola Graf ◽  
Athanasios Katsoyiannis ◽  
Kevin C. Jones ◽  
Andrew J. Sweetman
Keyword(s):  
Air Quality ◽  
Monitoring Network ◽  
Ambient Air ◽  
Air Monitoring ◽  
Continuous Data ◽  
Ambient Air Monitoring

Exposing infrastructure: how activists and experts connect ambient air monitoring and environmental health

2016 ◽  
Vol 3 (2) ◽  
pp. 155-165 ◽  
Author(s):  
Gwen Ottinger ◽  
Elisa Sarantschin
Keyword(s):  
Environmental Health ◽  
Ambient Air ◽  
Air Monitoring ◽  
Ambient Air Monitoring

Performance evaluation of twelve low-cost PM2.5 sensors at an ambient air monitoring site

2019 ◽  
Vol 216 ◽  
pp. 116946 ◽  
Author(s):  
Brandon Feenstra ◽  
Vasileios Papapostolou ◽  
Sina Hasheminassab ◽  
Hang Zhang ◽  
Berj Der Boghossian ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Low Cost ◽  
Ambient Air ◽  
Air Monitoring ◽  
Monitoring Site ◽  
Ambient Air Monitoring

Micro-optics in lighting applications

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Wolfgang Mönch
Keyword(s):  
Light Emitting Diodes ◽  
Light Sources ◽  
Large Area ◽  
Light Emitters ◽  
Optical Elements ◽  
Optical Components ◽  
Light Emitting ◽  
Reflection And Refraction ◽  
Automotive Lighting ◽  
The Individual

AbstractThe intention of this article is to give a concise overview on current applications of micro-optical components in lighting, including general lighting, automotive lighting, projection, and display backlighting. Regarding the light sources, the focus of this paper is on inorganic light-emitting diodes (LEDs) and the characteristic problems encountered with them. Lasers, laser diodes, and organic light-emitting diodes (OLEDs) are out of scope of this paper. Micro-optical components for current applications of inorganic LEDs may be categorized essentially into three classes: First, components for light shaping, i.e., adjusting the intensity distribution to a desired target; second, components for light homogenization with respect to space and color, and third, large-area micro-optical elements. These large-area elements comprise micro-optical slabs and sheets for guiding, reflection, and refraction of light and are designed without regard to particular details of type, design, arrangement, and layout of the individual light emitters. References are given to textbooks and review articles to guide the interested reader to further and more detailed studies on the problems discussed here.

Ambient air monitoring with Auto-gas chromatography running in trigger mode

2007 ◽  
Vol 596 (1) ◽  
pp. 156-163 ◽  
Author(s):  
Liming Zhou ◽  
Yousheng Zeng ◽  
Pamela D. Hazlett ◽  
Valerie Matherne
Keyword(s):  
Gas Chromatography ◽  
Ambient Air ◽  
Air Monitoring ◽  
Ambient Air Monitoring ◽  
Trigger Mode

scholarly journals Intercomparison of Aerosol Spectrometers for Ambient Air Monitoring

2002 ◽  
Vol 36 (8) ◽  
pp. 866-876 ◽  
Author(s):  
Aadu Mirme ◽  
Wolfgang G. Kreyling ◽  
Andrey Khlystov ◽  
Harry ten Brink ◽  
Juhani Ruuskanen ◽  
...  
Keyword(s):  
Ambient Air ◽  
Air Monitoring ◽  
Ambient Air Monitoring

High-Speed Ambient Air Monitoring of Ethylene Oxide in Sterilization Units

2012 ◽  
Vol 9 (8) ◽  
pp. D143-D145 ◽  
Author(s):  
Berthold Moser ◽  
Josef Rieder
Keyword(s):  
Ethylene Oxide ◽  
High Speed ◽  
Ambient Air ◽  
Air Monitoring ◽  
Ambient Air Monitoring
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