Random image motion analysis with Ivory 2.0 FE models

Alson E. Hatheway

doi:10.1117/12.738548

14 September 2007 Random image motion analysis with Ivory 2.0 FE models

Alson E. Hatheway

Proceedings Volume 6675, Optical Modeling and Performance Predictions III; 66750E (2007) https://doi.org/10.1117/12.738548
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

A MWIR FLIR has been designed as the principal pointing and tracking system for a turret full of other sensors and systems in its payload. The payload is stabilized and vibration isolated but some vehicle disturbances get through these systems to excite the optical bench of the payload. These residual disturbances cause boresight shift and image blur of the IR image on the FLIR's cooled detector. Ivory was used to prepare a thermal and structural dynamic NASTRAN model of the FLIR image's response to the residual disturbances. The physical prescription for the FLIR optics was put into Ivory and it calculated all the influence coefficients between the image on the detector and all the lens design variables and all the lens motions. Ivory then prepared the portion of the NASTRAN model that relates the optical element displacements to the image motions. The Ivory optical model was then attached to an elastic model of the FLIR and payload and the effects on the image of temperature changes, gravitational vector changes and residual random vibrations were analyzed in NASTRAN. This paper discusses the Ivory modeling process, the error budgets associated with the analysis, the debugging of the models and the final analytical results.

Citation Download Citation

Alson E. Hatheway "Random image motion analysis with Ivory 2.0 FE models", Proc. SPIE 6675, Optical Modeling and Performance Predictions III, 66750E (14 September 2007); https://doi.org/10.1117/12.738548

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