On-chip cavity-enhanced absorption spectroscopy using a white light-emitting diode and polymer mirrors

Lab on a Chip ◽  
2015 ◽  
Vol 15 (3) ◽  
pp. 711-717 ◽  
Author(s):  
Cathy M. Rushworth ◽  
Gareth Jones ◽  
Martin Fischlechner ◽  
Emma Walton ◽  
Hywel Morgan
Keyword(s):  
Absorption Spectroscopy ◽  
White Light ◽  
Microfluidic Chip ◽  
Path Length ◽  
Light Emitting Diode ◽  
Absorption Path Length ◽  
Light Emitting ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
On Chip

We have integrated disposable polymer mirrors within a microfluidic chip to form a multi-pass cell, which increases the absorption path length by a maximum of 28 times, providing micromolar detection limits in a probed volume of 10 nL.

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

In situ measurements of atmospheric NO2 using incoherent broadband cavity-enhanced absorption spectroscopy with a blue light-emitting diode

2013 ◽  
Vol 11 (6) ◽  
pp. 063001-63004 ◽  
Author(s):  
Liuyi Ling Liuyi Ling ◽  
Pinhua Xie Pinhua Xie ◽  
Min Qin Min Qin ◽  
Wu Fang Wu Fang ◽  
Yu Jiang Yu Jiang ◽  
...  
Keyword(s):  
Blue Light ◽  
Absorption Spectroscopy ◽  
Light Emitting Diode ◽  
In Situ Measurements ◽  
Light Emitting ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy

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.

Unconventional formation of dual-colored InP quantum dot-embedded silica composites for an operation-stable white light-emitting diode

2018 ◽  
Vol 6 (43) ◽  
pp. 11749-11756 ◽  
Author(s):  
Eun-Pyo Jang ◽  
Jung-Ho Jo ◽  
Seung-Won Lim ◽  
Han-Byule Lim ◽  
Hwi-Jae Kim ◽  
...  
Keyword(s):  
Quantum Dot ◽  
White Light ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
On Chip

Using unconventionally formed silica composites embedded with both green and red InP/ZnSeS/ZnS QDs, an operation-stable, on-chip-packaged white light-emitting diode is demonstrated.

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.

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