Fourier transform phase shift cavity ring down spectroscopy

Hamers, E. A. G.; Schram, DC Daan; Engeln, Rah Richard

doi:10.1016/s0009-2614(02)01457-4

Cited by 42 publications

(31 citation statements)

References 20 publications

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“…The multiplex features of broadband methods allow several target species to be detected simultaneously. Broadband CRD methods have been known for several years [22][23][24][25][26][27][28][29][30] and have already been applied to atmospheric trace sensing [14,31]. A drawback of these pulsed broadband CRD setups is that they require tunable laser sources along with unconventional light detection electronics and data sampling.…”

Section: Introductionmentioning

confidence: 99%

Long optical cavities for open-path monitoring of atmospheric trace gases and aerosol extinction

et al. 2009

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Type of publicationArticle (peer-reviewed) An incoherent broadband cavity-enhanced absorption spectroscopy setup employing a 20 m long optical cavity is described for sensitive in situ measurements of light extinction between 630 and 690 nm. The setup was installed at the SAPHIR atmospheric simulation chamber during an intercomparison of instruments for nitrate (NO 3 ) radical detection. The long cavity was stable for the entire duration of the two week campaign. A detection limit of ∼2 pptv for NO 3 in an acquisition time of 5 s was established during that time. In addition to monitoring NO 3 , nitrogen dioxide (NO 2 ) concentrations were simultaneously retrieved and compared against concurrent measurements by a chemiluminescence detector. Some results from the campaign are presented to demonstrate the performance of the instrument in an atmosphere containing water vapor and inorganic aerosol. The spectral analysis of NO 3 and NO 2 , the concentration dependence of the water absorption cross sections, and the retrieval of aerosol extinction are discussed. The first deployment of the setup in the field is also briefly described.

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Section: Introductionmentioning

confidence: 99%

Long optical cavities for open-path monitoring of atmospheric trace gases and aerosol extinction

et al. 2009

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“…Ball and Jones, 2003;Brown, 2003) or a Xe-Arc lamp (e.g. Hamers et al, 2002;Fiedler et al, 2003) or they used inexpensive and small diode lasers. If highly coherent (and hence narrow-band) laser sources are used, large intensity fluctuations can occur because the laser emission profile only overlaps with a few cavity modes.…”

Section: Methodsmentioning

confidence: 99%

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

Meinen

Thieser²,

Platt³

et al. 2010

Atmos. Chem. Phys.

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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 NO 3 . 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 NO 3 ) is necessary for calibration of the instrument if appropriate corrections are applied to the CEAS theory. Therefore the CE-DOAS technique can -in principlemeasure 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 NO 3 formed by mixing of NO 2 and O 3 in air. It was then compared to other trace gas detection techniques in an intercomparison

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“…In the broadband version by 8 Hamers et al [7] the intensity-modulated light of a high pressure cw xenon arc was directed 9 into the cavity after passing through a Fourier Transform (FT) spectrometer, and the light 10 transmitted through the cavity was detected by a photomultiplier tube. The ratio of the FT of 11 the in-phase and out-of-phase components of the intensity modulated light exiting the cavity…”

Section: Phase-shift Crd Spectroscopymentioning

confidence: 99%

“…ods that determine the characteristic photon storage time in the cavity (ring-down approach 31 [6] or phase shift measurements [7]), and methods that measure the light intensity transmitted 32 through the cavity [8]. This book chapter predominantly aims at the discussion of the latter 33 type of approach.…”

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confidence: 99%