Non-Intrusive Velocity Measurement of Millichannel Flow by Spontaneous Raman Imaging

Takahashi, Motoyuki; Furukawa, Tomohiro; Sato, Yohei; Hishida, Koichi

doi:10.1299/jtst.7.406

Cited by 5 publications

(7 citation statements)

References 10 publications

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“…Although several LDV and PIV have been applied to measure flow velocity, they require particle seeding. Recently, techniques for measuring the flow field without the seeding of particles were developed by using fluo rescence and Raman scattering [7,8,12]. To overcome the disadvantages associated with using particles for measuring flow, different dyes were used as markers [13].…”

Section: Introductionmentioning

confidence: 99%

Practical methodology for in situ measurement of micro flow rates using laser diode absorption sensors

et al. 2019

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A laser diodebased flowmeter based on the infrared absorption method that can measure in situ micro flow rates from 0.2 to 20 ml h −1 was developed. A 1450 nm laser absorbed in water was irradiated to form a heated spot at 0 mm, and the temperature was measured upstream and downstream of the heated spot. The flow rate was measured by the temperature difference obtained by two diode lasers and photodetectors upstream and downstream of the heated spot. We measured the temperature profile of the flow rate by changing the temperature measurement position and the heating laser energy upstream and downstream of the heated spot, and compared the measurements with the simulation results. As the flow rate increased, the temperature profile shifted downstream, and the measured temperature upstream and downstream were analyzed according to the flow rate. The flow measurement range was adjusted according to the temperature measurement position. Increasing the energy of the heating laser also improved the measurement accuracy in the lower flow range. The developed flowmeter was calibrated by the gravimetric method, and the deviation and measurement uncertainty according to the flow rate were obtained. The maximum measurement uncertainty was 6.8% at a 1 ml h −1 flow rate, and the minimum measurement uncertainty was 1.78% at 8 ml h −1 . Thus, it was confirmed that the flow rate can be measured through the temperature difference gauged using a simple diode laser set. Using the laser diodebased flowmeter developed in this study, one can measure the flow rate in situ without injecting contaminants, such as particles, for measurements without cutting the piping. In addition, it can be manufactured in a miniaturized form at a low cost, and thus, it can be used for multidrug infusion analysis, semiconductor process monitoring, etc.

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Section: Introductionmentioning

confidence: 99%

Practical methodology for in situ measurement of micro flow rates using laser diode absorption sensors

et al. 2019

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“…Although several studies use PIV to measure a flow field, there are a few limitations of PIV such as the requirement of particle seeding. Recently, techniques for measuring the flow field without seeding particles were developed by using fluorescence and Raman scattering [7,8,10]. In order to overcome the disadvantages associated with using particles for measuring flow, different dyes were used as markers [11].…”

Section: General Introductionmentioning

confidence: 99%

“…In order to overcome the disadvantages associated with using particles for measuring flow, different dyes were used as markers [11]. A non-intrusive measurement technique based on spontaneous Raman imaging was proposed to investigate microscale flow structures [10] and spray flow [7]. Specifically, near-infrared (NIR) spectroscopy is a conventional method for measuring the molecular composition using a vibrational molecular band [12].…”

Section: General Introductionmentioning

confidence: 99%

In situ measurement of micro flow rate using near infrared absorption method

Lee

Chun

et al. 2018

Opt. Express

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A novel technique is presented for measuring micro flow rate using the near infrared (NIR) absorption method. The principle of this method is based on the temperature dependency of the NIR absorption band of water (O-H band, ν + ν). We obtained the water temperature in the tube in situ condition using NIR absorption method. A calibration curve between temperature and the NIR absorption intensity in the range of 1500 nm - 1700 nm wavelength was obtained. For measuring flow rate in the tube, the tiny spot of water in the tube was heated using NIR laser (1450 nm) through the lens which was absorbed into the water. The temperature profiles along the tube were obtained using the NIR absorption method via laser heating for different flow rates. The simulation results of the temperature profiles were well matched with the experimental results of it for different flow rates. We found that the conduction affected the temperature more when the flow was low in the upstream and the convection more affected when the flow rate was high in the downstream through the heat transfer analysis. The flow rates were obtained from the temperature difference between the room temperature and the obtained temperature from the NIR method. The calibration curves between the flow rate and temperature obtained from the NIR absorption method was obtained in the two flow rates (1-20 mL/h and 40-100 mL/h). The error and uncertainty of the NIR absorption method for measuring flow rate were approximately 1.2% and 1% at the 1-100 mL/min flow rate, respectively. Thus, we confirmed that the NIR absorption method quantitatively measures the flow rate with respect to the in situ condition for the first time. This method is used for various applications including biomedical and chemical processing without causing any contamination owing to the flow meter installation.

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“…They successfully visualized a micro-mixing process of water and ethanol, but still relied on the use of fluorescent particles for velocity measurement. In order to realize a particle-free velocity measurement, Takahashi, et al (2012) measured ion concentration in channel flow by Raman imaging and calculated the fluid velocity from the displacement of the peak position in time-series concentration distributions. However, the technique requires an injection of a drop of electrolyte solution as tracer, and thus it has only limited applicability.…”

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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Non-Intrusive Velocity Measurement of Millichannel Flow by Spontaneous Raman Imaging

Cited by 5 publications

References 10 publications

Practical methodology for in situ measurement of micro flow rates using laser diode absorption sensors

Practical methodology for in situ measurement of micro flow rates using laser diode absorption sensors

In situ measurement of micro flow rate using near infrared absorption method

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

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