An optical photography probe employing pulsed light-emitting diode (LED) illumination has been developed for application to coarse water measurement in wet steam. High image resolution (1.38 μm/pixel) and low exposure time (100 ns) photographs capture details of microdynamic flow features with reduced motion blur. Camera and lens are held inside a 50 mm O.D. cylindrical tube, with a custom designed titanium probe head allowing purging air to clear the front optical surface of stagnant liquid. Double exposure images are analyzed using standard image processing techniques to extract the size and velocity of liquid droplets. The accuracy and repeatability of the measurement probe has been verified on air–water sprays with direct comparison to phase-Doppler anemometry (PDA) measurements, which show good agreement.
Pulsed Light-Emitting Diode Photography for Coarse Water Characterization
Contributed by the Controls, Diagnostics and Instrumentation Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 10, 2014; final manuscript received July 11, 2014; published online August 18, 2014. Editor: David Wisler.
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Vernon, K., Hann, D., and Rice, T. (August 18, 2014). "Pulsed Light-Emitting Diode Photography for Coarse Water Characterization." ASME. J. Eng. Gas Turbines Power. January 2015; 137(1): 011602. https://doi.org/10.1115/1.4028096
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