scholarly journals Optomechanical Shutter Modulated Broad-Band Cavity–Enhanced Absorption Spectroscopy of Molecular Transients of Astrophysical Interest

2013 ◽  
Vol 117 (39) ◽  
pp. 9363-9369 ◽  
Author(s):  
Anton Walsh ◽  
Dongfeng Zhao ◽  
Wim Ubachs ◽  
Harold Linnartz
Keyword(s):  
Absorption Spectroscopy ◽  
Broad Band ◽  
Astrophysical Interest ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy

scholarly journals Incoherent broad-band cavity-enhanced absorption spectroscopy for simultaneous trace measurements of NO2 and NO3 with a LED source

2010 ◽  
Vol 101 (3) ◽  
pp. 661-669 ◽  
Author(s):  
I. Ventrillard-Courtillot ◽  
E. Sciamma O’Brien ◽  
S. Kassi ◽  
G. Méjean ◽  
D. Romanini
Keyword(s):  
Absorption Spectroscopy ◽  
Broad Band ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy

Near-infrared broad-band cavity enhanced absorption spectroscopy using a superluminescent light emitting diode

The Analyst ◽  
2009 ◽  
Vol 134 (11) ◽  
pp. 2220 ◽  
Author(s):  
W. Denzer ◽  
M. L. Hamilton ◽  
G. Hancock ◽  
M. Islam ◽  
C. E. Langley ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Near Infrared ◽  
Light Emitting Diode ◽  
Broad Band ◽  
Light Emitting ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy

scholarly journals Broadband Cavity Enhanced Absorption Spectroscopy: A New Approach to Search for DIB Carriers

2013 ◽  
Vol 9 (S297) ◽  
pp. 281-285
Author(s):  
A. J. Walsh ◽  
D. Zhao ◽  
W. Ubachs ◽  
H. Linnartz
Keyword(s):  
Absorption Spectroscopy ◽  
Broad Band ◽  
Incoherent Light ◽  
New Approach ◽  
Interstellar Clouds ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
Diffuse Interstellar Bands ◽  
Planar Plasma ◽  
Set Up

AbstractA new and sensitive set-up to swiftly test proposed carriers of the diffuse interstellar bands (DIBs), over a relatively broad spectral range, is described. The instrument utilizes broad-band cavity enhanced absorption spectroscopy (BBCEAS) and incorporates an optomechanical shutter to modulate light from a continuous incoherent light source. A pulsed supersonically expanding planar plasma expansion is used to mimic conditions in translucent interstellar clouds. Measurements of plasma durations as low as 400 μs are possible. The sensitivity is estimated to be better than 10 ppm/pass, measured with an effective exposure time of only ca. 1 s. The performance and potential of the instrument is demonstrated on spectra of C5H, C6H and C9H3 recorded through expanding hydrocarbon plasma.

scholarly journals Detection of Sulfur Dioxide by Broadband Cavity Enhanced Absorption Spectroscopy (BBCEAS)

2021 ◽  
Author(s):  
Ryan Thalman ◽  
Jaron C. Hansen
Keyword(s):  
Sulfur Dioxide ◽  
Absorption Spectroscopy ◽  
Cross Sections ◽  
Limit Of Detection ◽  
Uv Light ◽  
Broad Band ◽  
Absorption Path Length ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
Averaging Time

Abstract. Sulfur dioxide (SO2) is an important precursor for formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broad Band Cavity Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO2 with a minimum limit of detection of 0.6 ppbv using the spectral range 305.5–312 nm and an averaging time of 60 seconds. The instrument consists of high reflectivity mirrors (0.9984 at 310 nm) and a deep UV light source. The effective absorption path length of the instrument is 610 m in a 0.957 m base length. Published reference absorption cross-sections were used to fit and retrieve the SO2 concentrations and were compared to a diluted standard for SO2. The comparison was well correlated, R2 = 0.9985 with a correlation slope of 1.01.

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