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3rd International Workshop on Instrumentation for Planetary Missions (2016) 4123.pdf

STATE OF SMALL INSTRUMENTS FOR NANO- APPLICATIONS – A REVIEW. J. C. Castillo-Rogez, S. M. Feldman, J. D. Baker, G. Vane, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109.

Introduction: Nano-platforms, in the 1-10 kg Short lifetime and limited data rates require range, are gaining maturity for deep space exploration to be returned shortly following acquisition. Opera- thanks to increased investments from various space tional complexity, associated for example with materi- agencies into miniaturized subsystems and instru- al sampling and processing, or calibration, may simply ments. The last decade has seen the introduction of preclude the implementation of certain measurement small platforms such as JAXA’s Minerva and techniques into small spacecraft. As the field of minia- the MASCOT (Mobile Surface Scout) [1] turized instruments progresses, it will be important to developed by the German Space Agency (DLR), both consider new ways of implementing old techniques. of which are flying on the 2. Rover missions This is expecially true for optical instruments which to developed by NASA (e.g., Pathfinder, Mars could benefit greatly from the most recent technologi- Exploration Rovers, ) and cal advances enabling miniaturization, for example ESA (Beagle 2, , ’s Philae, ExoMars) computational methods, on-chip spectrometers, and have fostered the development of small instruments new semiconductor-based devices. some of which can be leveraged on future nano- spacecraft. NASA’s recent focus on Cubesat have led State of the Art in Small Instruments: A review to the development of a reference 3U bus (INSPIRE, of instruments that have flown on past and current mis- Interplanetary Nanospacecraft Pathfinder in Relevant sions shows the availability of a spectrum of geophysi- Environment, [2]) and a 6U bus (NEAScout and Lunar cal and fields and particles instruments (seismometers, Flashlight missions, MSFC/JPL [3]) developed under penetrometers, thermal probes, particle detectors, etc.); the sponsorship of the Advanced Exploration Systems only a few optical and spectrometer instruments are (HEOMD). The growing interest across the community available in a small form factor, including visible cam- for Cubesats and other nanosatellites for deep space eras (e.g., NEAScout imaging system [3]), ultraviolet exploration requires the availability of small instru- sensors [5], new generation of small IR-spectrometer ments that can be easily implemented on these plat- such as the Lunar Flashlight point spectrometer [6], the forms and yet remain performant. LunarCubes’ BIRCHES [7], as well as micro- We review the current state of the art in small in- bolometers; a few analytical chemistry instruments struments that may be applicable to future missions have already been demonstrated on small landers, such involving independent or deployable platforms in the as alpha-particle X-ray spectrometer [8] and gas chro- 1-10 kg range. We first highlight instruments inherited matograph-mass spectrometer [9]. More advanced from past missions and then address requirements and spectrometers for chemical measurements, especially way forward for the development of future small in- isotopes, typically require larger platforms, especially strument. when solid material sampling and processing is re- Framework: Nano-spacecrafts open a new dimen- quired. However a new class of miniaturized mass sion in planetary exploration with the introduction of spectrometers (e.g., JPL’s quadrupole ion trap mass new architectures that carry the potential to increase spectrometers [10]) will open up possibilities in at- science return at low cost: distributed network, com- mospheric sampling with small probes [11]. Tunable plementary vantage point between mothership and laser spectrometers have seen a huge success in recent daughterships, expandable assets for the exploration of years, with the tunable laser spectrometer (TLS) on high-risk areas (e.g., cometary plumes) [4]. An obvious , capable of measuring gas abundances and trade to the low scale and cost of these platforms is a isotope ratios to extremely high precision [12]. Path- degradation in science data quality and quantity in ways exist for further miniaturization, and instruments comparison to the science return of larger missions, targetting specific gases and isoptope ratios (e.g., D/H which the community is used to. in H2O) could be designed to fit on small platforms. Mass and power are obvious limitations intrinsic to These instruments could, for example, sample come- nano-spacecraft. Smaller detectors and apertures gen- tary plumes, or deploy mechanisms for surface heating erally imply degraded spectral resolution and spatial and gas capture on icy bodies. Key technological gaps resolution; the latter may be compensated for by flying have been identified in the area of instruments, the spacecraft closer to the target. although novel approaches such as passive radio exper- 3rd International Workshop on Instrumentation for Planetary Missions (2016) 4123.pdf

iments should enable probing deep interiors with small high-radiation, atmospheric, or in situ environments spacecraft from orbit or even during flybys [13]. may conflict with the perception that nano-spacecraft, Many instruments required for addressing strategic and especially Cubesats, may offer reference platforms knowledge gaps at Near Earth and Mars’ for plug and play experiments. are already small enough to be deployed on small spacecraft as is illustrated by recent Cubesat Acknowledgements: This study is being devel- concepts: NEAScout [3] and the Hedgehog platform oped at the Jet Propulsion Laboratory, California Insti- currently developed under NASA’s Space Technology tute of Technology, under contract to NASA. Mission Directorate [14]. References: [1] Jaumann, R. (2013) LPS 44, 1500. Emerging Technologies for the Next Generation [2] Klesh, A., et al. (2013) Proc. 27th Annual of Small Instruments: AIAA/USU Conference on Small Satellites. [3] Cas- • Advanced detector technologies, for example the tillo-Rogez, J. C., et al. (2016) NASA Exploration Sci- HOTBIRD (High Operating Temperature Barrier ence Forum, https://ac.arc.nasa.gov/p82b7is9fqr/. [4] Infrared Detector [15]), enables instrument minia- Klesh, A., Castillo-Rogez, J. (2012) Proc. Space 2012 turization without loss of performance. Conference. [5] Ishimaru, R., et al. (2016) This Con- • Increased aperture, for example in the context of ference. [6] Cohen, B., et al. (2014) NASA Exploration Cubesat-based search and characteriza- Science Forum. [7] Clark, P. E., et al. (2016) This con- tion; origami-inspired deployable optics have been ference. [8] Foley, C., et al. (2003) J. Geophys. Res. recently introduced as a promising approach [16]. 108, E12. [9] Raulin, F., et al. (1989) Origins of Life • Increased on-board intelligence can help optimize and Evolution of the Biosphere 19, 497-498. [10] science return when lifetime and downlink re- Madzunkov, S. M., Nikolic, D. (2014) J. Am. Soc. sources are tight and/or when observing opportuni- Mass. Spectrom. 25, 1841-1852. [11] Darrach, M., et ties are time constrained, e.g., in the case of a flyby al. (2015) Workshop on Harsh-Environment Mass or impacting experiment. Agile Science algorithms Spectrometry, http://www.hems- [17] can help optimize science return via on-board workshop.org/10thWS/Talks/Durrach.pdf; [12] Web- data processing, compression, and triage. ster, C.R. et al. (2014) “Tunable Laser Spectrometers • Deployment mechanisms: low-cost nano-spacecraft For Space Science”, Instrumentation for Planetary should ideally avoid the number and complexity of Mission Workshop 2014. [13] Romero-Wolf, A., et al. internal mechanisms. However deployable booms (2014) eprint arXiv:1404.1876. [14] Pavone, M., et al. have been recently introduced, for example for the (2013) Proc. IEEE Aerospace Conference 2013. [15] INSPIRE and RainCube Ka-band Ting, D. Z.−Y., et al. (2011) In: Semiconductors and radar mission [18]. Semimetals 84, 1–57, Eds. S.D. Gunapala, D.R. • Smart configuration of the may help opti- Rhiger, and C. Jagadish, Elsevier, Amsterdam. [16] mize the shielding of electronics [19], as well as re- Marchis, F., (2014) SPIE Astronomical Tele- lax operational requirements, e.g., thermal control scopes+Instrumentation Conference, #9143-128. [17] • Low-temperature electronics would be suitable in Thompson, D. R. (2012) SpaceOps order to relax requirements on thermal control. http://ml.jpl.nasa.gov/papers/thompson/Thompson_201 th • Smart packaging, for example foldable electronics, 2_SpaceOps.pdf. [18] Sauder, J., et al. (2015) 29 An- can help to significantly decrease instrument vol- nual AIAA/USU Conference on Small Satellites, ume. SSC15-VI-7. [19] Castillo-Rogez, J. C. (2013) Low- • The development of standard instrument interfaces Cost Planetary Mission Workshop, will also be instrumental to the introduction of ref- http://lcpm10.caltech.edu/pdf/session-6/3_LCPM10- erence nano-spacecraft flight systems that may be Castillo_Final.pdf. [20] Gowen, R. A., et al. (2011) considered for a variety of missions. Adv. Space Res. 48, 725-742.

Environment Specific Requirements: The availa- bility of small instruments for future small-class de- ployable platforms at Europa is limited to fields and particles. High-g investigations (penetrators) set re- quirements on instrument survivability that may be out of reach from the current generation of instruments, except for seismometers [20]. Significant tailoring to