The Tiny Remote-sensing Instrument for Thermospheric Oxygen and Nitrogen (TRITON) is being developed by the U.S. Naval Research Laboratory (NRL) for detection of neutral components of the daytime thermosphere. TRITON measures naturally occurring, far ultraviolet (FUV) emissions of the upper atmosphere that are produced as a result of solar excitation. The sensor concept is based primarily on multiple sensors previously developed at NRL with recent spaceflight heritage. The legacy optics have been under evaluation and development for extension to new emission targets and brighter ambient environments. Recent TRITON development work has included characterization of a new photomultiplier tube and comparison to performance of a previously used model. In addition, several bandpass filters are evaluated for their effectiveness in providing the out-of-band rejection needed to isolate the FUV and MUV emissions of interest. The primary optical layout of TRITON sensors will be described to highlight the components that have been changed or adapted for use in the new configuration. The results of recent lab tests will also be shown to demonstrate the expected performance of TRITON relative to prior, legacy components and subsystems.
The Neutron Radiation Detection Instrument-1A (NeRDI-1A) is a neutron sensor on the International Space Station (ISS) as part of the Department of Defense Space Test Program (STP) mission STP-H9. NeRDI-1A uses the scintillator Tl2LiYCl6:Ce as well as three Domino microstructured semiconductor neutron detectors (MSNDs) with varying levels of moderation and an EJ-270 plastic scintillator. The primary objective of NeRDI-1A is to space qualify TLYC and MSND detectors by studying the effects of on-orbit radiation background on the performance of these detectors over the nominal one-year mission. NeRDI-1A was launched to the ISS on 15 March 2023 GMT aboard SpX-27.
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