Raman Gas Mixing Measurements and Ramanography

Hartley, D. L.

doi:10.1007/978-1-4684-2103-3_21

Cited by 12 publications

(4 citation statements)

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“…As an alternative to the point mapping approach, a direct and wide-field Raman imaging technique (also known as 'Ramanography') was introduced in 1974 [37]. This technique employs wide-field sample illumination and the scattered light is imaged onto a two-dimensional CCD detector.…”

Section: Two-wavelength Raman Imaging For Non-intrusive Monitoring Of...mentioning

confidence: 99%

Two-wavelength Raman imaging for non-intrusive monitoring of transient temperature in microfluidic devices

Kuriyama

Sato

2014

Meas. Sci. Technol.

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The present study proposes a non-intrusive visualization technique based on two-wavelength Raman imaging for in-situ monitoring of the unsteady temperature field in microfluidic systems. The measurement principle relies on the contrasting temperature dependencies of hydrogen-bonded and non-hydrogen-bonded OH stretching modes of the water Raman band, whose intensities were simultaneously captured by two cameras equipped with corresponding bandpass filters. The temperature distributions were then determined from the intensity ratio of the simultaneously-obtained Raman images, which enables compensation for temporal fluctuation and spatial inhomogeneity of the excitation laser intensity. A calibration experiment exhibited a linear relationship between the temperature and the intensity ratio in the range 293–343 K and least-regression analysis gave an uncertainty of 1.43 K at 95% confidence level. By applying the calibration data, time series temperature distributions were quantitatively visualized in a Y-shaped milli-channel at a spatial resolution of 6.0 × 6.0 µm2 with an acquisition time of 16.5 s. The measurement result clearly exhibited the temporal evolution of the temperature field and was compared with the values obtained by thermocouples. This paper therefore demonstrates the viability of employing the two-wavelength Raman imaging technique for temperature measurements in microfluidic devices.

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Section: Two-wavelength Raman Imaging For Non-intrusive Monitoring Of...mentioning

confidence: 99%

Two-wavelength Raman imaging for non-intrusive monitoring of transient temperature in microfluidic devices

Kuriyama

Sato

2014

Meas. Sci. Technol.

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“…Electrolysis has been performed on metal wires (21-25), carbon rods (26, 27), hanging mercury drop electrodes (28, 29), and tubular pyrolytic graphite-coated electrodes (30) for spectrochemical applications. The technique has also been applied to flame AA, using a thin film of mercury deposited on a wax-impregnated graphite rod (31), to a direct current arc using a hanging mercury drop electrode (HMDE) (32) and to a helium microwave induced plasma (He-MIP) (33). A wall-jet electrochemical cell for preconcentration of trace metals from flowing streams prior to their determination by ICP with conventional pneumatic nebulization was also described (34).…”

Section: Methodsmentioning

confidence: 99%

“…Similarly, three-dimensional spatial resolution can be obtained directly by using a thin sheet of exciting radiation or a multipass cell and monitoring the resulting fluorescence (29)(30)(31)(32) or Raman (33,34) signal. Two spatial dimensions are then viewed simultaneously by an imaging detector while the resolution in the third dimension is provided by the width of the narrow sheet of exciting radiation.…”

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confidence: 99%

Optical imaging spectrometers

Olesik¹,

Hieftje²

1985

Anal. Chem.

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Two optical systems for acquisition of two-dimensional Images are described. The systems, respectively, an electronic slitless spectrograph and a monochromatic Imaging spectrometer, both usé a Czerny-Turner monochromator for spectral discrimination. A silicon Intensified target vidicon detector provides quantitative Images In time-integrated or timé-resolved modes. By use of simple single-lens Imagetransfer optics with a monochromator, spatial resolution on the order Of 0.3 mm Is attainable. Applications of the Imaging spectrometers for spatial mapping of Inductively coupled plasmas and flames are Illustrated.

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“…Raman imaging, also called Ramanography (Hartley, 1974;Braeuer, et al, 2009), can be a powerful tool for such application since it utilizes spontaneous Raman scattering from sample material itself, and does not require any tracer or marker to be added. Using this technique, Roetmann, et al (2008) realized a non-intrusive and planar concentration measurement in a micro-mixer.…”

Section: Introductionmentioning

confidence: 99%

An investigation of measurement condition for non-intrusive velocity determination based on thermal tracing by Raman imaging

Kuriyama

Sato

2014

JTST

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The present study proposes a velocity measurement based on thermal tracing by Raman imaging and investigates its applicability focusing on the error in temperature measurement, towards the establishment of a non-intrusive and micro-scale velocimetry. In order to realize fluorescence-free measurement, two-wavelength Raman imaging was employed to measure the temperature field in a channel flow. This technique exploits the contrasting temperature dependencies of hydrogen-bonded (HB) and non-hydrogen-bonded (NHB) OH stretching Raman bands of liquid water, and enables the determination of planar temperature distributions from the intensity ratio of the HB to NHB images. A calibration experiment showed a linear relationship between the temperature and the Raman intensity ratio in the range 293−333 K with temperature sensitivity of −0.56% K -1 .It was also confirmed that the spatial variation of the intensity ratio led to a large measurement error (approximately 9.1 K). Afterwards Raman images were acquired with various measurement conditions, and the influence of each parameter on the measurement error was quantitatively investigated. The apparent temperature variance was considerably reduced by increasing electron-multiplying gain and binning factor for spatial averaging, whereas an increase in the size of the measurement area resulted in a quadratic increase in the temperature variance due to the inhomogeneous excitation intensity. Finally, the requirements of the thermal flow conditions for the present methodology to be applied were quantitatively examined according to the measurement results.

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Raman Gas Mixing Measurements and Ramanography

Cited by 12 publications

References 1 publication

Two-wavelength Raman imaging for non-intrusive monitoring of transient temperature in microfluidic devices

Two-wavelength Raman imaging for non-intrusive monitoring of transient temperature in microfluidic devices

Optical imaging spectrometers

An investigation of measurement condition for non-intrusive velocity determination based on thermal tracing by Raman imaging

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