<p>In this paper, we present a simple and cost-efficient single-camera measurement setup for simultaneous temperature and velocity field measurements by two-color Planar Laser Induced Fluorescence (PLIF) and Particle Image Velocimetry (PIV). The camera we used is a three-chip color camera, which utilizes an optical prism to separate the incoming light into the three primary colors: red, green, and blue, each captured by an individual monochromatic camera sensor. Compared to conventional color filter array color cameras, a three-chip camera features significantly less color cross-talk and increased spatial resolution. By illuminating PIV tracers and exciting the fluorescent dyes Rhodamine 110 and RuPhen with a blue 450 nm laser light sheet in water, the camera is capable of recording time-resolved PIV images in the blue color channel, and two-color PLIF images were recorded in the green and red color channels simultaneously. We achieve a high temperature sensitivity of up to <InlineEquation ID="IEq1"> <EquationSource Format="TEX">${5\,\mathrm{\% ^{\circ }\text {C}^{-1}}}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>5</mn> <mspace width="0.166667em" /> <mrow> <msup> <mo>%</mo> <mo>∘</mo> </msup> <msup> <mtext>C</mtext> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> </mrow> </mrow> </math></EquationSource> </InlineEquation> and demonstrate the feasibility of the proposed measurement approach on a Rayleigh–Bénard convection (RBC) experiment at a Rayleigh number <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\text{Ra} = {1.2 \times {10}^8}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>Ra</mtext> <mo>=</mo> <mrow> <mn>1.2</mn> <mo>×</mo> <msup> <mrow> <mn>10</mn> </mrow> <mn>8</mn> </msup> </mrow> </mrow> </math></EquationSource> </InlineEquation> and Prandtl number <InlineEquation ID="IEq3"> <EquationSource Format="TEX">$\text{Pr} = 6.1$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>Pr</mtext> <mo>=</mo> <mn>6.1</mn> </mrow> </math></EquationSource> </InlineEquation>. The resulting simultaneous temperature and velocity data reveal detaching plumes near the heating and cooling plates and enable a direct analysis of heat transfer. The probability density function (PDF) of the dimensionless heat transfer of a short measurement shows the typical skew toward positive values.</p>

Improving simultaneous two-color PLIF and PIV temperature and velocity field measurements through a single three-chip color camera

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2026年1月24日

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Clemens Naumann,
Theo Käufer,
Nicolas Stark,
Christian Cierpka

摘要

In this paper, we present a simple and cost-efficient single-camera measurement setup for simultaneous temperature and velocity field measurements by two-color Planar Laser Induced Fluorescence (PLIF) and Particle Image Velocimetry (PIV). The camera we used is a three-chip color camera, which utilizes an optical prism to separate the incoming light into the three primary colors: red, green, and blue, each captured by an individual monochromatic camera sensor. Compared to conventional color filter array color cameras, a three-chip camera features significantly less color cross-talk and increased spatial resolution. By illuminating PIV tracers and exciting the fluorescent dyes Rhodamine 110 and RuPhen with a blue 450 nm laser light sheet in water, the camera is capable of recording time-resolved PIV images in the blue color channel, and two-color PLIF images were recorded in the green and red color channels simultaneously. We achieve a high temperature sensitivity of up to ${5\,\mathrm{\% ^{\circ }\text {C}^{-1}}}$ $5 %^{\circ} C^{- 1}$ and demonstrate the feasibility of the proposed measurement approach on a Rayleigh–Bénard convection (RBC) experiment at a Rayleigh number $\text{Ra} = {1.2 \times {10}^8}$ $Ra = 1.2 \times 10^{8}$ and Prandtl number $\text{Pr} = 6.1$ $Pr = 6.1$ . The resulting simultaneous temperature and velocity data reveal detaching plumes near the heating and cooling plates and enable a direct analysis of heat transfer. The probability density function (PDF) of the dimensionless heat transfer of a short measurement shows the typical skew toward positive values.