Sensitive measurement of photon lifetime and true reflectances in an optical cavity by a phase-shift method

Herbelin, John M.; McKay, James A.; Kwok, Munson A.; Ueunten, R. H.; Urevig, D S; Spencer, Donald; Benard, D. J.

doi:10.1364/ao.19.000144

Cited by 213 publications

(82 citation statements)

References 3 publications

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“…Here we present aerosol σ ep coefficient measurements obtained using a recently developed instrument that uses Cavity Attenuated Phase Shift (CAPS) technology (Herbelin et al 1980;Herberlin and McKay 1981). This method has already been already successfully employed for measurements of ambient NO 2 concentrations Kebabian et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Aerosol Light Extinction Measurements by Cavity Attenuated Phase Shift (CAPS) Spectroscopy: Laboratory Validation and Field Deployment of a Compact Aerosol Particle Extinction Monitor

Massoli

Kebabian

Onasch

et al. 2010

Aerosol Science and Technology

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We present laboratory and field measurements of aerosol light extinction (σ ep ) using an instrument that employs Cavity Attenuated Phase Shift (CAPS) spectroscopy. The CAPS extinction monitor comprises a light emitting diode (LED), an optical cavity that acts as the sample cell, and a vacuum photodiode for light detection. The particle σ ep is determined from changes in the phase shift of the distorted waveform of the square-wave modulated LED light that is transmitted through the optical cell. The 3-σ detection limit of the CAPS monitor under dry particle-free air is 3 Mm -1 for 1s integration time. Laboratory measurements of absolute particle extinction cross section (σ ext ) using non-absorbing, monodisperse polystyrene latex (PSL) spheres are made with an average precision of ±3% (2-σ ) at both 445 and 632 nm. A comparison with Mie theory scattering calculations indicates that these results are accurate within the 10% uncertainty stated for the particle number density measurements. The CAPS extinction monitor was deployed twice in 2009 to test its robustness and performance outside of the laboratory environment. During these field campaigns, a co-located Multi Angle Absorption Photometer (MAAP) provided particle light absorption coefficient (σ ap ) at 635 nm: the single scattering albedo (ω) of the ambient aerosol particles was estimated by combining the CAPS σ ep measured at 632 nm with the MAAP σ ap data. Our initial results show the high potential of the CAPS as lightweight, compact instrument to perform precise and accurate σ ep measurements of atmospheric aerosol particles in both laboratory and field conditions.

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Section: Introductionmentioning

confidence: 99%

Aerosol Light Extinction Measurements by Cavity Attenuated Phase Shift (CAPS) Spectroscopy: Laboratory Validation and Field Deployment of a Compact Aerosol Particle Extinction Monitor

Massoli

Kebabian

Onasch

et al. 2010

Aerosol Science and Technology

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“…The technique with an intensity modulation of laser radia− tion (with frequency f) is very useful for the phase shifted CRDS measurement which is characterized by a good preci− sion [45]. The phase shift of a cavity output signal in respect to the laser signal occurs due to the radiation energy storage in the resonator.…”

Section: Cavity Ring-down Spectroscopymentioning

confidence: 99%

Ultrasensitive laser spectroscopy for breath analysis

Wojtas

Bielecki

Stacewicz

et al. 2012

Opto-Electronics Review

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At present there are many reasons for seeking new methods and technologies that aim to develop new and more perfect sensors for different chemical compounds. However, the main reasons are safety ensuring and health care. In the paper, recent advances in the human breath analysis by the use of different techniques are presented. We have selected non-invasive ones ensuring detection of pathogenic changes at a molecular level. The presence of certain molecules in the human breath is used as an indicator of a specific disease. Thus, the analysis of the human breath is very useful for health monitoring. We have shown some examples of diseases’ biomarkers and various methods capable of detecting them. Described methods have been divided into non-optical and optical methods. The former ones are the following: gas chromatography, flame ionization detection, mass spectrometry, ion mobility spectrometry, proton transfer reaction mass spectrometry, selected ion flow tube mass spectrometry. In recent twenty years, the optical methods have become more popular, especially the laser techniques. They have a great potential for detection and monitoring of the components in the gas phase. These methods are characterized by high sensitivity and good selectivity. The spectroscopic sensors provide the opportunity to detect specific gases and to measure their concentration either in a sampling place or a remote one. Multipass spectroscopy, cavity ring-down spectroscopy, and photo-acoustic spectroscopy were characterised in the paper as well.

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“…In fact, the CRD scheme was firstly developed for quantifying high-reflectivity mirrors that were difficult to characterize by other means [1,2]. A few years later, the CRD technique gained popularity due to its ability of measuring absorption in real time, with highly sensitivity, using pulsed light sources [3].…”

Section: Introductionmentioning

confidence: 99%

Fiber cavity ring down and gain amplification effect

et al. 2016

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Abstract:The effect of an erbium-doped fiber amplifier (EDFA) placed inside the fiber ring of a cavity ring down (CRD) configuration is studied. The limitations and advantages of this configuration are discussed, and the study of the ring-down time as a function of the current applied and gain to the EDFA is also presented. In this case, the power fluctuations in the output signal are strongly dependent on the cavity ring-down time with the EDFA gain.

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Sensitive measurement of photon lifetime and true reflectances in an optical cavity by a phase-shift method

Cited by 213 publications

References 3 publications

Aerosol Light Extinction Measurements by Cavity Attenuated Phase Shift (CAPS) Spectroscopy: Laboratory Validation and Field Deployment of a Compact Aerosol Particle Extinction Monitor

Aerosol Light Extinction Measurements by Cavity Attenuated Phase Shift (CAPS) Spectroscopy: Laboratory Validation and Field Deployment of a Compact Aerosol Particle Extinction Monitor

Ultrasensitive laser spectroscopy for breath analysis

Fiber cavity ring down and gain amplification effect

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