Spectral calibration of a visible projector

Mark H. Bowden; D. Brett Beasley; David S. Cosby

doi:10.1117/12.819779

22 April 2009 Spectral calibration of a visible projector

Mark H. Bowden, D. Brett Beasley, David S. Cosby

Proceedings Volume 7301, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing XIV; 73010K (2009) https://doi.org/10.1117/12.819779
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

It is typically assumed in calibrating emitter array projection systems that the radiated spectrum is Planckian and that intervening optics attenuate the signal but do not change the spectral shape significantly. Calibrating such a system is relatively easy in that blackbody reference sources are available to calibrate the unit under test (UUT), or other sensor with similar spectral responsivity, which can then be used as a transfer standard for array calibration. In this way the projector command value required to produce the same response in the UUT as the modeled object is readily obtained. With a visible projector, this is not the case. The modeled object spectrum is often solar reflective. To calibrate using the same approach as infrared systems would require a 5800 K blackbody. Furthermore, the spectrum of the visible output in a multispectral, common boresight projection system can differ pathologically from the visible projector subsystem alone because of dichroic beam combiner characteristics. This paper describes a process developed to calibrate a visible projector in such a system without even having the UUT or spectrally equivalent surrogate available as a transfer standard.

Citation Download Citation

Mark H. Bowden, D. Brett Beasley, and David S. Cosby "Spectral calibration of a visible projector", Proc. SPIE 7301, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing XIV, 73010K (22 April 2009); https://doi.org/10.1117/12.819779

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