Measurement of rotorcraft blade deformation using projection moire interferometry

Gary A. Fleming; Susan Althoff Gorton

doi:10.1117/12.307738

1 June 1998 Measurement of rotorcraft blade deformation using projection moire interferometry

Gary A. Fleming, Susan Althoff Gorton

Proceedings Volume 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1998) https://doi.org/10.1117/12.307738
Event: Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1998, Ancona, Italy

Abstract

Projection Moire interferometry (PMI) has been sued to obtain near instantaneous, quantitative blade deformation measurements of a generic rotorcraft model at several test conditions. These laser-based measurements provide quantitative, whole field, dynamic blade deformation profiles conditionally sampled as a function of rotor azimuth. The instantaneous nature of the measurements permits computation of the mean and unsteady blade deformation, blade bending, and twist. The PMI method is presented, and the image processing steps required to obtain quantitative deformation profiles from PMI interferograms are descried. Experimental results are provided which show blade bending, twist, and unsteady motion. This initial proof-of-concept test has demonstrated the capability of PMI to acquire accurate, full field rotorcraft blade deformation data.

Citation Download Citation

Gary A. Fleming and Susan Althoff Gorton "Measurement of rotorcraft blade deformation using projection moire interferometry", Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); https://doi.org/10.1117/12.307738

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