Beam-modulation methods in quantitative and flow-visualization holographic interferometryHeterodyne holographic interferometry and time-average holography with a frequency shifted reference beam are discussed. Both methods will be used for the measurement and visualization of internal transonic flows where the target facility is a flutter cascade. The background and experimental requirements for both methods are reviewed. Measurements using heterodyne holographic interferometry are presented. The performance of the laser required for time-average holography of time-varying transonic flows is discussed.
Decker, Arthur J. (NASA Lewis Research Center Cleveland, OH, United States)
September 5, 2013
November 1, 1986
Publication: AGARD Advanced Instrumentation for Aero Engine Components