30 March 2009 Calibration and performance of laser steering system for dynamic in-flight tracking and measurement
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Noncontact measurements of flexible and moving structures have the challenge of obtaining high speed, accurate and registered data over a long range. 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 accuracy of the measurement. Laser vibrometry can capture minute, structural vibrations but must be aligned to the point of interest. This paper presents a method of registering a laser vibrometer steering system to a motion capture system. The basis of calibration lies on determining the location of the laser steering system through the videogrammetry capture volume for dynamic in-flight tracking and measurement. A method for using video capture of the laser is presented to determine registered lines through the capture volume. Results of the calibration are sufficient to have the laser track within half a degree for distances over 4m. The laser is then able to be open-loop steered with static and dynamic accuracies presented. This system can provide real-time structural awareness enabling active control.
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Jonathan Simpkins, Jonathan Simpkins, Ryan Sollars, Ryan Sollars, Alan Jennings, Alan Jennings, Chris Allen, Chris Allen, Jonathon T. Black, Jonathon T. Black, } "Calibration and performance of laser steering system for dynamic in-flight tracking and measurement", Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72923O (30 March 2009); doi: 10.1117/12.818132; https://doi.org/10.1117/12.818132

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