Erratum: “Incoherent broad-band cavity-enhanced absorption spectroscopy of liquids” [Rev. Sci. Instrum. 76, 023107 (2005)]

Fiedler, Sven E.; Hese, A.; Ruth, Albert A.

doi:10.1063/1.1960687

Cited by 28 publications

(40 citation statements)

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“…(36)- (38) can now be simplified to 1/(1 -R), 1= ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi 2ð1 À RÞ p and 1/2, respectively. This second result has been derived previously by Fiedler et al [33,36,37], where shot noise was assumed as the only noise type present in the measurement. It is apparent from Eqs.…”

Section: Quantification Of the Signal-to-noise Ratio Enhancement Of Ceasmentioning

confidence: 68%

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Understanding the sensitivity of cavity-enhanced absorption spectroscopy: pathlength enhancement versus noise suppression

Ouyang

Jones

2012

Appl. Phys. B

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Cavity-enhanced absorption spectroscopy is now widely used as an ultrasensitive technique in observing weak spectroscopic absorptions. Photons inside the cavity are reflected back and forth between the mirrors with reflectivities R close to one and thus (on average) exploit an absorption pathlength L that is 1/(1 -R) longer than a single pass measurement. As suggested by the Beer-Lambert law, this increase in L results in enhanced absorbance A (given by aL with a being the absorption coefficient) which in turn favours the detection of weak absorptions. At the same time, however, only (1 -R) of the incident light can enter the cavity [assuming that mirror transmission T is equal to (1 -R)], so that the reduction in transmitted light intensity DI caused by molecular absorption equates to that would be obtained if in fact no cavity were present. The enhancement in A = DI/I, where

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Section: Quantification Of the Signal-to-noise Ratio Enhancement Of Ceasmentioning

confidence: 68%

“…All these observations show the interplay between the two different types of noises in typical CEAS measurements, and it is expected that the enhancement factor Q will fall between the two limiting values given by Eqs. (36) and (37) at the limit of ad ? 0.…”

Section: Discussionmentioning

confidence: 99%

Understanding the sensitivity of cavity-enhanced absorption spectroscopy: pathlength enhancement versus noise suppression

Ouyang

Jones

2012

Appl. Phys. B

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“…In this case, scattering by the liquid limits the performance, although useful enhancements are still possible. 13 These multiple applications of a single wavelength absorption measurement highlight the low specificity of the detector and the need to account for confounding absorptions. Possible strategies include pre-concentrating the target analyte or selectively removing or quantifying interferences at another wavelength or by other means, such as Zeeman correction or a deuterium lamp as in traditional AAS.…”

Section: Resultsmentioning

confidence: 99%

“…This is feasible for our system because it is still far from the shot-noise regime where the enhancement factor improves more modestly as 2/(1 − R). 13 Extremely high mirror reflectivities are probably not feasible in the deep-ultraviolet owing to increased scatter and absorption by the dielectric mirror coatings. The cavity mirrors in our system were fabricated using electron-beam evaporation coating because it produces less absorbing coatings than alternative methods.…”

Section: Resultsmentioning

confidence: 99%

“…5 Several groups have subsequently used broadband light sources such as arc-lamps 5 and LEDs 11 for trace gas detection, and supercontinuum sources 12 for analysis of liquid samples. 13 To our knowledge, atomic line sources have not been used for cavities. As low vapour pressure mercury (Hg) lamps are known for the intense 253.7 nm emission line of Hg, corresponding to the 3 P 1 → 1 S 0 transition, these lamps have practical potential as light sources for use with optical cavities.…”

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Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements

Darby

Smith

Venables

2012

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Optical cavities are commonly used to increase the sensitivity of absorption measurements, but have not been extensively used below 300 nm, mainly owing to the limited light sources at these wavelengths. While some progress has been made using cavity ring-down spectroscopy, these systems rely on complex and expensive lasers. Here we investigate an approach combining Cavity-Enhanced Absorption Spectroscopy (CEAS) with an inexpensive low vapour pressure mercury lamp for sensitive absorption measurements at 253.7 nm. We demonstrate that the CEAS absorption in our system is 50 times greater than the absorption found in a single-pass configuration; using this approach, we obtained limits of detection of 8.1 pptv (66 ng m(-3)) for gaseous elemental mercury and 8.4 ppbv for ozone. We evaluate the performance of the system and discuss potential improvements and applications of this approach

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Cavity Ringdown Laser Absorption Spectroscopy

Wang

Miller

Winstead

2008

Encyclopedia of Analytical Chemistry

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Cavity ringdown spectroscopy (CRDS) has developed rapidly during the last two decades and has been implemented for a variety of applications ranging from fundamental spectroscopic studies, trace chemical detection for environmental monitoring, combustion flame chemistry and plasma diagnostics, elemental and isotopic measurements, breath gas analysis, and fiber ringdown chemical and physical sensor development. A host of chemical species, including atoms, ions, molecules, clusters, and free radicals, have been studied by CRDS. The experimental ringdown scheme has also evolved from an original mirror‐based format to various new forms for detection and analysis of analytes in either gas phase or liquid solutions. Recent research effort has also extended the CRDS approach for fiber optical sensor development. CRDS has become a mature spectrometric technique for a range of prototype and commercial instrumentation. This article provides a review of the latest developments in CRDS applications, specifically emphasizing new trends in elemental and isotopic analysis, plasma diagnostics, breath gas analysis, and new fiber ringdown techniques for sensor development. The introduction of cutting‐edge laser sources into CRDS methods, the combination of CRDS with conventional analytical tools, and current CRDS instrumentation are also briefly discussed.

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Erratum: “Incoherent broad-band cavity-enhanced absorption spectroscopy of liquids” [Rev. Sci. Instrum. 76, 023107 (2005)]

Cited by 28 publications

References 0 publications

Understanding the sensitivity of cavity-enhanced absorption spectroscopy: pathlength enhancement versus noise suppression

Understanding the sensitivity of cavity-enhanced absorption spectroscopy: pathlength enhancement versus noise suppression

Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements

Cavity Ringdown Laser Absorption Spectroscopy

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