A paper describes an optical stimulus that produces more consistent results, and can be automated for unattended, routine generation of data analysis products needed by the integration and testing team assembling a high-fidelity imaging spectrometer system. One key attribute of the system is an arrangement of pick-off mirrors that provides multiple input beams (five in this implementation) to simultaneously provide stimulus light to several field angles along the field of view of the sensor under test, allowing one data set to contain all the information that previously required five data sets to be separately collected. This stimulus can also be fed by quickly reconfigured sources that ultimately provide three data set types that would previously be collected separately using three different setups: Spectral Response Function (SRF), Cross-track Response Function (CRF), and Along-track Response Function (ARF), respectively.

This method also lends itself to expansion of the number of field points if less interpolation across the field of view is desirable. An absolute minimum of three is required at the beginning stages of imaging spectrometer alignment.

This work was done by Michael L. Eastwood, Robert O. Green, Pantazis Mouroulis, Eric B. Hochberg, Randall C. Hein, Linley A. Kroll, Sven Geier, and James B. Coles of Caltech, and Riley Meehan of Tufts University for NASA’s Jet Propulsion Laboratory. NPO-47809


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Multi-Beam Approach for Accelerating Alignment and Calibration of HyspIRI-Like Imaging Spectrometers

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This article first appeared in the December, 2012 issue of NASA Tech Briefs Magazine.

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