Status Report on ANITA2 - The European Programme on High Performance Air Monitoring of ISS Trace Gas Contamination and Gas Concentration Dynamics

2011 ◽  
Author(s):  
Timo Stuffler ◽  
Dirk Kampf ◽  
Sven Gutruf ◽  
H. Mosebach ◽  
Kristin Kaspersen ◽  
...  
Keyword(s):  
High Performance ◽  
Air Monitoring ◽  
Trace Gas ◽  
Status Report ◽  
Gas Concentration ◽  
Gas Contamination ◽  
European Programme

scholarly journals Solar occultation with SCIAMACHY: algorithm description and first validation

2005 ◽  
Vol 5 (1) ◽  
pp. 17-66 ◽  
Author(s):  
J. Meyer ◽  
A. Bracher ◽  
A. Rozanov ◽  
A. C. Schlesier ◽  
H. Bovensmann ◽  
...  
Keyword(s):  
Vertical Profile ◽  
Estimation Method ◽  
Optimal Estimation ◽  
Trace Gas ◽  
Transmission Spectra ◽  
Atmospheric Transmission ◽  
Gas Concentration ◽  
Solar Occultation ◽  
First Results ◽  
The Vertical Distribution

Abstract. This presentation concentrates on solar occultation measurements with the spaceborne spectrometer SCIAMACHY in the UV-Vis wavelength range. Solar occultation measurements provide unique information about the vertical distribution of atmospheric constituents. For retrieval of vertical trace gas concentration profiles, an algorithm has been developed based on the optimal estimation method. The forward model is capable to simulate the extinction signals of different species as they occur in atmospheric transmission spectra obtained from occultation measurements. Furthermore, correction algorithms have been implemented to address shortcomings of the tangent height pre-processing and inhomogeneities of measured solar spectra. First results of O3 and NO2 vertical profile retrievals have been validated with data from ozone sondes and satellite based occultation instruments. The validation shows very promising results for SCIAMACHY O3 and NO2 values between 15 to 35 km with errors in the order of 10% and 15%, respectively.

scholarly journals Background Radiance Estimation for Gas Plume Quantification for Airborne Hyperspectral Thermal Imaging

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Ramzi Idoughi ◽  
Thomas H. G. Vidal ◽  
Pierre-Yves Foucher ◽  
Marc-André Gagnon ◽  
Xavier Briottet
Keyword(s):  
Synthetic Data ◽  
Hyperspectral Data ◽  
Trace Gas ◽  
Gas Concentration ◽  
Components Analysis ◽  
The Difference ◽  
Long Wave Infrared ◽  
Radiance Estimation

Hyperspectral imaging in the long-wave infrared (LWIR) is a mean that is proving its worth in the characterization of gaseous effluent. Indeed the spectral and spatial resolution of acquisition instruments is steadily decreasing, making the gases characterization increasingly easy in the LWIR domain. The majority of literature algorithms exploit the plume contribution to the radiance corresponding to the difference of radiance between the plume-present and plume-absent pixels. Nevertheless, the off-plume radiance is unobservable using a single image. In this paper, we propose a new method to retrieve trace gas concentration from airborne infrared hyperspectral data. More particularly the outlined method improves the existing background radiance estimation approach to deal with heterogeneous scenes corresponding to industrial scenes. It consists in performing a classification of the scene and then applying a principal components analysis based method to estimate the background radiance on each cluster stemming from the classification. In order to determine the contribution of the classification to the background radiance estimation, we compared the two approaches on synthetic data and Telops Fourier Transform Spectrometer (FTS) Imaging Hyper-Cam LW airborne acquisition above ethylene release. We finally show ethylene retrieved concentration map and estimate flow rate of the ethylene release.

High Power DFB Laser for Trace Gas Concentration and Precision Metrology

2010 ◽  
Author(s):  
L. Hildebrandt ◽  
J. Koeth ◽  
M. Fischer ◽  
M. Legge ◽  
J. Seufert ◽  
...  
Keyword(s):  
High Power ◽  
Trace Gas ◽  
Gas Concentration ◽  
Dfb Laser ◽  
Precision Metrology

Applications of Kalman filtering to real-time trace gas concentration measurements

2002 ◽  
Vol 74 (1) ◽  
pp. 85-93 ◽  
Author(s):  
D.P. Leleux ◽  
R. Claps ◽  
W. Chen ◽  
F.K. Tittel ◽  
T.L. Harman
Keyword(s):  
Real Time ◽  
Kalman Filtering ◽  
Trace Gas ◽  
Gas Concentration ◽  
Time Trace ◽  
Concentration Measurements

Application of Difference Frequency Laser in Trace Gas Measurement System

2011 ◽  
Vol 225-226 ◽  
pp. 1323-1326
Author(s):  
Qiu Xia Yang ◽  
Yang Ping Zhu ◽  
Zhi Quan Li ◽  
Zheng Jun Liu
Keyword(s):  
Frequency Conversion ◽  
Nonlinear Crystal ◽  
Far Infrared ◽  
Measurement Model ◽  
Concentration Measurement ◽  
Tunable Diode Laser ◽  
Difference Frequency ◽  
Trace Gas ◽  
Laser Source ◽  
Gas Concentration

Based on Nd:YAG laser, tunable diode laser, electro-optic amplitude modulator and the difference frequency generator, a servo scanning laser source is designed, and the principle of trace gas concentration measurement model is introduced as well, which can realize the gas concentration measurement in the band of mid-infrared and far-infrared. Based on the theory of electromagnetic field, mutual coupling equation about laser transmission in nonlinear crystal and the optical frequency conversion characteristics are analyzed theoretically. As a result, in the range of far-field, electric field intensity of coupled wave increases approximatively exponentially,then tends to be stable.

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