Dynamic Performance of Vibrometer Steering System for Dynamic In-ight Tracking and Measurement

Noncontact dynamic measurements of lightweight exible aerospace structures in motion present several challenges. Achieving high frequency and high resolution measurements requires multiple registered metrology systems. Many noncontact measurement methods are based on the object staying aligned with the sensor. Yet sometimes the desired loading is a result of the motion interacting with structural dynamics as is the case with aeroelasticity. Triangulation of video data can capture large scale motion, but limits the speed and resolution of the measurement. Laser vibrometry can capture minute structural vibrations but assumes vibrations about an equilibrium point. This paper presents a method of registering a laser vibrometer steering system to a motion capture system to produce dynamic in-ight tracking measurements (DITM). The basis of the calibration lies with determining the location of the laser steering system through the videogrammetry capture volume for DITM. A method for using video capture of the laser is presented to determine 3-D lines through the capture volume that are used to determine origin of laser with respect to the video system. Results of the calibration are sucient to have the laser track within half a

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