Photoelectric Recording Interferometer for Gas Analysis

Namba, Susumu

doi:10.1063/1.1716711

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…However, as will be discussed, the use of a folded Jamin configuration can greatly reduce these noise contributions to negligible ͑manageable͒ levels and remove sensitivity of the measurement to optical component rotation and translation. [25][26][27][28]…”

Section: Introductionmentioning

confidence: 99%

Real-time detection of ambient aerosols using photothermal interferometry: Folded Jamin interferometer

Sedlacek

2006

Review of Scientific Instruments

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Work in our laboratory has been directed at the development of a new class of instrumentation that can directly measure ambient aerosol absorption through photothermal interferometry. The hallmark of this approach is its ability to directly measure aerosol absorption without interference from aerosol scattering since the signal originates from the thermal dissipation of the spectrally absorbed energy. While the principle of the photothermal technique for the detection of aerosols was demonstrated in the mid-1980s, this interferometric technique remains a laboratory technique largely due to sensitivity to mechanical vibrations and other environmental factors that result in unwanted signal interference and commensurate reduction in detection sensitivity. In order to realize its application outside the laboratory, a folded Jamin interferometer design has replaced both the traditional Mach-Zehnder and unfolded Jamin configurations. The folded Jamin affords many advantages, which include high degree of common mode noise rejection, insensitivity to rotation and translation of optical components, inherent double pass configuration, and compact size. In this article, we report on the performance of this optical configuration and present representative data for both absorbing and nonabsorbing aerosols.

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Section: Introductionmentioning

confidence: 99%

Real-time detection of ambient aerosols using photothermal interferometry: Folded Jamin interferometer

Sedlacek

2006

Review of Scientific Instruments

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“…However, as will be discussed, employ a folded Jamin configuration can reduce these noise contributions to negligible (manageable) levels and remove sensitivity of the interferometer alignment to optical component rotation and translation. [20][21][22][23] …”

Section: Introductionmentioning

confidence: 99%

Directly measuring aerosol absorption using photothermal interferometry (PTI)

Sedlacek

2005

Chemical and Biological Sensors for Industrial and Environmental Security

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The importance of elucidating the direct and indirect effects of aerosol radiative forcing is now recognized as a significant component of our global climate forecasting models that must be better understood and quantified. Of particular interest is that of aerosol forcing through the socalled "direct" effect of aerosol absorption and scattering. This forcing can be of a magnitude comparable to those induced by anthropogenically-released greenhouse gases, yet can be either the opposite sign [negative (cooling)] or same sign [positive (warming)]. However, despite focused work on this issue, significant discrepancies on aerosol absorption still exist between measurements inferred from remote sensing and those obtained by in situ techniques. This is due, in large part, to the simple fact that the scattering channel dominates aerosol extinction, and thereby, makes measurement of the absorption difficult.An alternative method to measuring aerosol absorption will be presented: measurement of the thermal dissipation of the spectrally absorbed energy through interferometry. The use of this coherent optical detection technique is particularly well suited to measuring the refractive index change that accompanies this energy transfer process. [1,2] This technique was even demonstrated towards measuring aerosol absorption in the mid-1980s [3]. Attractive features of this technique for measuring aerosol absorption include its insensitivity to aerosol scattering, its ability to conduct the measurement in situ, its inherent high sensitivity, and near real-time response.A discussion on the theoretical basis for this technique along with some preliminary data will be presented. Potential applications of this instrument to environmental security problems will also be discussed.

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Progress in reduced scale determination of physical constants: 1959

Wiberley

Drake

1960

Microchemical Journal

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Photoelectric Recording Interferometer for Gas Analysis

Cited by 5 publications

References 6 publications

Real-time detection of ambient aerosols using photothermal interferometry: Folded Jamin interferometer

Real-time detection of ambient aerosols using photothermal interferometry: Folded Jamin interferometer

Directly measuring aerosol absorption using photothermal interferometry (PTI)

Progress in reduced scale determination of physical constants: 1959

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