Global luminescent lifetime measurements on a body in free fall

Dale, Gary A.; Baron, Alan; Tyler, Charles; Mastrocola, V.

doi:10.1109/iciasf.1997.644653

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…with OPTROD's L4 paint and an integration time of 150 ns (Engler & Klein 1997). Dale et al (1997) used a prototype fast-framing CCD camera to make lifetime measurements on a falling body illuminated by a pulsed laser. The lifetime of the luminescence was determined from 11 sequential 8-µs images acquired after the laser pulse.…”

Section: Imaging Systemsmentioning

confidence: 99%

SURFACEPRESSUREMEASUREMENTSUSINGLUMINESCENTCOATINGS

Bell

Schairer

Hand

et al. 2001

Annu. Rev. Fluid Mech.

464

246

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Key Words pressure-sensitive paints, optical measurement techniques, photogrammetry, aerodynamic loads, wind tunnel testing s Abstract An optical technique is described that is often used nowadays to measure surface pressures on wind tunnel models and flight vehicles. The technique uses luminescent coatings, which are painted on the model surface, excited by light of appropriate wavelength, and imaged with digital cameras. The intensity of the emitted light is inversely proportional to the surface pressure. Hence, the surface pressures can be measured efficiently and affordably with a high spatial resolution. The theory and chemistry of how such coatings work and the parameters that affect them are presented. The required hardware and software are described, with emphasis on the different measurement systems and procedures. The various error sources are discussed, and correction schemes that can be used to minimize them are presented. Sample results, covering a wide range of conditions and applications, are presented and discussed.

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Section: Imaging Systemsmentioning

confidence: 99%

SURFACEPRESSUREMEASUREMENTSUSINGLUMINESCENTCOATINGS

Bell

Schairer

Hand

et al. 2001

Annu. Rev. Fluid Mech.

464

246

View full text Add to dashboard Cite

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“…In addition measurements can be made for cases in which a reference image is impossible. These include the measurement of pressure in the case of flutter (12) , a falling store (13) , rotating helicopter blades (14) or flight tests (15) . The only disadvantage of the lifetime technique is that a scanning laser is usually used to obtain measurements over the surface, preventing full field measurements and the use of cross correlation techniques.…”

Section: Use Of Luminescent Paintmentioning

confidence: 99%

Aerospace applications of luminescent paint

Kingsley-Rowe

Lock²,

Davies³

2003

Aeronaut. j.

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Luminescent paints allow non-intrusive measurement of pressure and temperature at high spatial resolution without prior knowledge of the flow-field. Experiments have demonstrated that a ‘standard’ luminescent paint technique, developed by BAE Systems, can simultaneously measure steady pressure and temperature. This is achieved through knowledge of the paint phosphorescence lifetime rather than the absolute intensity, which increases the measurement accuracy. In addition, a new ‘fast’ paint has been calibrated at the University of Bath for the measurement of unsteady pressure using a variable frequency pulsing air jet. Pressure measurements were made with both paints in the wake of various excrescences, sized to produce vortex shedding in the frequency range 500–4,200Hz, in a transonic tunnel. The extent of the wakes was determined from a flow visualisation technique. Time-averaged measurements, using both luminescent paints, and transient measurements of the unsteady pressure field, made with the fast paint, were compared with transducer data. For all cases the luminescent paint data compared well with the conventional measurements and the Strouhal number agreed well with data from the literature. The use of luminescent paint for the simultaneous measurement of pressure and temperature over a NACA 0012 aerofoil, as well as the quantification of convective heat transfer is examined in Part 2.

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“…This process requires additional test time to acquire reference images which increases the overall cost and difficulty of testing. To potentially remove the requirement for reference images, many PSP systems began to implement various types of lifetime-resolved data acquisition and processing [9,10]. However, while the new CCD cameras offer greatly expanded capabilities in terms of data (image) acquisition, these same capabilities provide a real insight into a number of challenges the traditional PSPs have, e.g.…”

Section: Introductionmentioning

confidence: 99%

Developing new nano-materials for use as pressure-sensitive coatings

Hamner¹

2008

Meas. Sci. Technol.

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Nano-materials have been defined as materials that are designed at microscopic scales to exhibit specific macroscopic properties. The materials described herein fit well within that definition. These materials yield novel pressure-sensitive coatings that break away from traditional pressure-sensitive coatings, also known as pressure-sensitive paints, in that they are not simple mixtures but rather complex photochemically reactive polymers. In addition, prior pressure-sensitive paints (coatings) used in ground test facilities to acquire global, surface pressure data were in fact oxygen sensors. Although there have always been a number of reasons to develop pressure-sensitive coatings that did not depend on the presence of oxygen to function, formulations for such coatings have remained elusive. Today, new novel pressure-sensitive coatings are being designed at the molecular level to exhibit specific optical responses to changes in pressure. When development of these new materials is coupled with recent developments in CCD camera technology, new more stable excitation (illumination) sources, and in-signal (image) processing techniques, the path to applying non-intrusive, global data acquisition tools and techniques over a much broader range of test conditions becomes realistic. This paper discusses the development of the new pressure-sensitive coating formulations.

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Global luminescent lifetime measurements on a body in free fall

Cited by 5 publications

References 2 publications

SURFACEPRESSUREMEASUREMENTSUSINGLUMINESCENTCOATINGS

SURFACEPRESSUREMEASUREMENTSUSINGLUMINESCENTCOATINGS

Aerospace applications of luminescent paint

Developing new nano-materials for use as pressure-sensitive coatings

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