Sensor fusion and novel “multi-image” systems that have several different spectral ranges are proliferating in tactical and commercial applications. Calibrating these devices requires a variety of sources from quartz-tungsten halogen to blackbodies to more selectable band sources such as LEDs. Usually these sources are used independently in discrete spectral regions, but real reflective and emissive targets often have signatures that make combining these sources necessary if one is to emulate these real spectrums for testing in either image (collimator) or flood (sphere) configurations. A novel approach to combine LED and broadband emitters has been developed to effect stable, calibrated, traceable sources that can match real target spectral signatures.

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Jeff Holt, Christopher Durell, Joe Jablonski, Saurabh Rabade, Jonathan Scheuch, and Alan Irwin, "A spectrally tunable light engine for UV-VIS-NIR-SWIR and beyond," Proc. SPIE 10625, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXIX, 1062505 (Presented at SPIE Defense + Security: April 17, 2018; Published: 26 April 2018); https://doi.org/10.1117/12.2304906.