17 December 1998 Performance measurements and results of the SSULI (Special Sensor Ultraviolet Limb Imager) stacked-grid collimator
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Abstract
The Naval Research Laboratory has built five ultraviolet spectrographs (SSULI) for the Air Force Defense Meteorological Satellite Program (DMSP). These sensors provide vertical intensity profiles of airglow emissions in the extreme and far ultraviolet spectral range of 800 to 1700 Angstrom and scan from 75 km to 750 km tangent altitude. A stacked grid collimator defines the 0.1 degree X 2.4 degree field-of- view of the sensor. The collimator is designed to cover the spectral range of the instrument and is optimized at 1000 angstrom. However, above 2000 angstrom, diffraction significantly reduces the collimator performance. Therefore, most characteristics of the collimator were previously measured in the UV. Recent theoretical work using Fourier optics to treat diffraction effects was used in the analysis of the performance of the collimators. Since transmission measurements are substantially easier and less expensive at visible wavelengths than in the vacuum ultraviolet, a technique was developed to adequately determine collimator performance in the UV from measurements in the visible. The performance of 3 SSULI collimators was evaluated at 2537 and 6328 angstrom. This paper presents a discussion of the results of the measured transmission and diffraction intensity patterns and their relationship to the theoretical predictions. Also presented is a description of techniques used to perform these measurements.
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Anna-Clair Milazzo, Anna-Clair Milazzo, Stefan E. Thonnard, Stefan E. Thonnard, Chau Lam, Chau Lam, } "Performance measurements and results of the SSULI (Special Sensor Ultraviolet Limb Imager) stacked-grid collimator", Proc. SPIE 3443, X-Ray and Ultraviolet Spectroscopy and Polarimetry II, (17 December 1998); doi: 10.1117/12.333615; https://doi.org/10.1117/12.333615
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