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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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GRACE-2: potential improvements in recovering terrestrial water storage variations
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Characterization of Nancy Grace Roman Space Telescope Slitless Spectrometer (grism)
We have published the optical design and early test results of the Roman Space Telescope grism spectrometer in previous SPIE proceedings. We report the follow-on activity of the spectral and radiometric calibrations, including the calibration methods, experiment designs, and test equipment calibration, such as the light source and detectors used in the test. The grism calibration includes the throughput versus wavelength, which is largely determined by the diffraction efficiency of the two diffractive surfaces. It also includes spectral resolution, point spread function, and relative radiometric measurements. The measured results are presented. The comparisons between the test data and the theoretical simulations are also presented. The tests and results presented are from the engineering test unit in ambient room temperature environment. The thermal/vacuum tests are planned to verify the results when the flight unit is ready.
Acquiring the inter-satellite laser link in the GRACE Follow-On Laser Ranging Interferometer
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A year plus in orbit: update on the GRACE Follow-On Laser Ranging Interferometer
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