Abstract
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.
| Original language | English |
|---|---|
| Article number | 14-00351 |
| Journal | Journal of Thermal Science and Technology |
| Volume | 9 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2014 Jan 1 |
Fingerprint
Keywords
- Fluid velocity
- Measurement condition
- Non-intrusive measurement
- Temperature measurement
- Thermal tracing
- Two-wavelength Raman imaging
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Instrumentation
- Engineering (miscellaneous)
Cite this
An investigation of measurement condition for non-intrusive velocity determination based on thermal tracing by Raman imaging. / Kuriyama, Reiko; Sato, Yohei.
In: Journal of Thermal Science and Technology, Vol. 9, No. 2, 14-00351, 01.01.2014.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An investigation of measurement condition for non-intrusive velocity determination based on thermal tracing by Raman imaging
AU - Kuriyama, Reiko
AU - Sato, Yohei
PY - 2014/1/1
Y1 - 2014/1/1
N2 - 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.
AB - 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.
KW - Fluid velocity
KW - Measurement condition
KW - Non-intrusive measurement
KW - Temperature measurement
KW - Thermal tracing
KW - Two-wavelength Raman imaging
UR - http://www.scopus.com/inward/record.url?scp=85066749944&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85066749944&partnerID=8YFLogxK
U2 - 10.1299/jtst.2014jtst0014
DO - 10.1299/jtst.2014jtst0014
M3 - Article
VL - 9
JO - Journal of Thermal Science and Technology
JF - Journal of Thermal Science and Technology
SN - 1880-5566
IS - 2
M1 - 14-00351
ER -