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Continuing the successful on-orbit operation of the VIIRS instruments currently on-board the Suomi-NPP and NOAA-20 spacecraft, additional VIIRS instruments are in development to be launched on future JPSS missions. Pre-launch testing of VIIRS, before integration with the spacecraft, is an important step in verifying the performance and operation of the instrument. As part of that testing, investigation into the near-field response (NFR) for each detector is required to assess the detector performance and assure there is no interference due to scattered light that could influence the radiometric measurements. A key element of this test is measuring the detector response of a bright target, followed by viewing the same target through neutral density filters. The measurements are stitched together to quantify the detector response over the entire dynamic range and fit using a Harvey-Shack scatter model. We present our findings for JPSS-4 VIIRS NFR performance evaluated during instrument ambient testing. The results include performance of the VIIRS detectors as compared against their specifications and comparisons against previous flight models.
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