Pressure sensitive paint systems for pressure distribution measurements in wind tunnels and turbomachines

Engler, Rolf; Klein, Christian; Trinks, O.

doi:10.1088/0957-0233/11/7/320

Cited by 70 publications

(34 citation statements)

References 1 publication

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“…By means of pressure-sensitive or temperature-sensitive paints (PSPs/TSPs) these basic factors in fluid mechanics can be imaged and quantified noninvasively with an unsurpassed spatial resolution. [9][10][11] A ubiquitous problem consists in the fact that probes for oxygen also respond to temperature (and vice versa). Therefore, the obtained pressure data have to be corrected to compensate the undesired temperature effects.…”

Section: Introductionmentioning

confidence: 99%

A Dual Luminescent Sensor Material for Simultaneous Imaging of Pressure and Temperature on Surfaces

Stich

Nagl

Wolfbeis

et al. 2008

Adv Funct Materials

165

151

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A novel kind of composite material for simultaneous luminescent determination of air pressure and temperature is presented. The dual sensor consists of a fluorinated platinum porphyrin complex (PtTFPP) as an oxygen‐sensitive probe, and of the highly temperature‐sensitive europium complex Eu(tta)3(dpbt) as temperature probe. Both are incorporated into different polymer microparticles to control response characteristics and to avoid interferences. Encapsulation of PtTFPP in poly(styrene‐co‐acrylonitrile) (PSAN) results in a broad dynamic range from 0.05 to 2.00 bar for pressure measurements. The europium complex was incorporated into poly(vinyl chloride) to reduce the cross sensitivity towards oxygen. This system represents a new class of luminescent sensor system, where the signals are separated via the different luminescence lifetimes of the indicators. It is possible to monitor the emission of the temperature‐sensitive probe by means of time‐resolved fluorescence imaging without interferences, because the luminescence lifetime of the temperature indicator is tenfold longer than that of the oxygen indicator. The temperature image can then be used to compensate cross sensitivity of the pressure indicator towards temperature. In combination with an appropriate time‐resolved measurement technique, this material enables simultaneous imaging of pressure (or oxygen partial pressure) and temperature distributions on surfaces. It is distinguished from other approaches of dual pressure and temperature sensitive paints because it avoids the need of signal separation by application of different cameras or by use of different optical filters or light sources.

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Section: Introductionmentioning

confidence: 99%

A Dual Luminescent Sensor Material for Simultaneous Imaging of Pressure and Temperature on Surfaces

Stich

Nagl

Wolfbeis

et al. 2008

Adv Funct Materials

165

151

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show abstract

“…[6][7][8] The measurement of barometric pressure plays an essential role in aerodynamics and in fluid mechanics. [9,10] Barometric pressure can be imaged with a luminescent oxygen-sensitive coating, often referred to as a pressure sensitive paint (PSP). Imaging offers a spatial resolution unsurpassed by any other method for the determination of barometric pressure, and PSPs, unlike other sensors, do not disturb the gas flow in wind tunnels.…”

Section: Introductionmentioning

confidence: 99%

Red‐ and Green‐Emitting Iridium(III) Complexes for a Dual Barometric and Temperature‐Sensitive Paint

Fischer

Stich

Wolfbeis

et al. 2009

Chemistry A European J

103

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A new dual luminescent sensitive paint for barometric pressure and temperature (T) is presented. The green-emitting iridium(III) complex [Ir(ppy)(2)(carbac)] (ppy=2-phenylpyridine; carbac=1-(9H-carbazol-9-yl)-5,5-dimethylhexane-2,4-dione) was applied as a novel probe for T along with the red-emitting complex [Ir(btpy)(3)], (btpy=2-(benzo[b]thiophene-2-yl)pyridine) which functions as a barometric (in fact oxygen-sensitive) probe. Both iridium complexes were dissolved in different polymer materials to achieve optimal responses. The probe [Ir(ppy)(2)(carbac)] was dispersed in gas-blocking poly(acrylonitrile) microparticles in order to suppress any quenching of its luminescence by oxygen. The barometric probe [Ir(btpy)(3)], in turn, was incorporated in a cellulose acetate butyrate film which exhibits good permeability for oxygen. The effects of temperature on the response of the oxygen probe can be corrected by simultaneous optical determination of T, as the poly(acrylonitrile) microparticles containing the temperature indicator are incorporated into the film. The phosphorescent signals of the probes for T and barometric pressure, respectively, can be separated by optical filters due to the approximately 75 nm difference in their emission maxima. The dual sensor is applicable to luminescence lifetime imaging of T and barometric pressure. It is the first luminescent dual sensor material for barometric pressure/T based exclusively on the use of Ir(III) complexes in combination with luminescence lifetime imaging.

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“…The PSP measurement mechanism is based on photo luminescence and oxygen quenching of luminescent molecules 14 . A typical PSP is composed of two main components: oxygen‐sensitive fluorescence molecules (which are called the probe molecules) and oxygen‐permeable binder materials.…”

Section: Principle Of Psp Measurementmentioning

confidence: 99%

Study on Influence of PSP Measurement System Characteristics

Gao

Wang

Guo

et al. 2011

Experimental Techniques

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The pressure‐sensitive paint (PSP) technique as an optical method enables measurement of surface pressure distribution over a model and its measurement system plays an important role in this technique. In the present study, the fluorescent PSP is used and PSP measurement system is established by the authors. The influence of the measurement system characteristics on calibration curves is then explored through many PSP calibration experiments. With five camera apertures and two ultraviolet (UV) lamp powers, the original PSP calibration images and curves are presented in this paper. The experimental results demonstrated that: (1) the characteristics of the PSP measurement system have an important effect on the pressure measurement; (2) the 400‐W UV lamp can provide adequate excitation photons to excite fluorescence molecules entering the energy transition and a larger charge‐coupled device (CCD) aperture can be used to improve the signal‐to‐noise rate (SNR) of the CCD.

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Pressure sensitive paint systems for pressure distribution measurements in wind tunnels and turbomachines

Cited by 70 publications

References 1 publication

A Dual Luminescent Sensor Material for Simultaneous Imaging of Pressure and Temperature on Surfaces

A Dual Luminescent Sensor Material for Simultaneous Imaging of Pressure and Temperature on Surfaces

Red‐ and Green‐Emitting Iridium(III) Complexes for a Dual Barometric and Temperature‐Sensitive Paint

Study on Influence of PSP Measurement System Characteristics

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