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3 October 2022 PACE OCI short-wave infrared detection assembly optical system design, alignment, and environmental test
James Champagne, Dallin Brailsford, Roy Esplin, Jacob Hedelius, Trent Newswander, James Peterson, Tyrel Rupp, Kenneth Squire, Eric Gorman, Emily Kan, D. Brent Mott, Luis Ramos-Izquierdo, Joe Thomes, Ulrik Gliese
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Proceedings Volume 12222, Optical System Alignment, Tolerancing, and Verification XIV; 1222204 (2022) https://doi.org/10.1117/12.2633631
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States
Abstract
The Ocean Color Instrument (OCI), which will be integrated with the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) satellite, will collect science data that will be used to monitor the health of Earth’s oceans and atmosphere. The Short-Wave Infrared (SWIR) Detection Assembly (SDA), built and characterized by Utah State University Space Dynamics Laboratory (SDL), is a subsystem of OCI consisting of 32 channels covering seven discrete optical bands of interest. A total of 16 SWIR Detection Subassemblies (SDSs) compose the SDA and house the cold optical system. The science data optical input for each SDS is supplied by a 0.22 NA multimode fiber interfacing with a fiber adapter. The diverging light from the fiber is collimated, split by a dichroic beamsplitter to two separate channels, filtered by the science filter, and then reimaged onto the single-element detectors with a final 0.76 NA. Aspheric, diamond-turned powered elements are used throughout the optical design. Fabrication and alignment tolerance analysis/budgets are balanced to ensure the optical system meets throughput requirements. All systems are aligned at ambient temperature using an InSb camera and an in-line illumination microscope system to directly image the active detector area through the science filters. Compensators used during alignment are detector focus and decenter, which are adjusted via photoetched shims in increments of 25 μm. Average focus and centering errors were less than 8 μm among all 32 flight and 10 flight spare detectors. Each SDS spectral response and conversion gain was verified at operational temperature of -65°C in vacuum.
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James Champagne, Dallin Brailsford, Roy Esplin, Jacob Hedelius, Trent Newswander, James Peterson, Tyrel Rupp, Kenneth Squire, Eric Gorman, Emily Kan, D. Brent Mott, Luis Ramos-Izquierdo, Joe Thomes, and Ulrik Gliese "PACE OCI short-wave infrared detection assembly optical system design, alignment, and environmental test", Proc. SPIE 12222, Optical System Alignment, Tolerancing, and Verification XIV, 1222204 (3 October 2022); https://doi.org/10.1117/12.2633631
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KEYWORDS
Sensors
Optical alignment
Geometrical optics
Optical design
Channel projecting optics
Ocean optics
Optical filters
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