| 词条 | Fine-Resolution Epithermal Neutron Detector | ||||||||||||||||||||
| 释义 |
| Name = Fine-Resolution Epithermal Neutron Detector (FREND) | Image = | Caption = | Operator = European Space Agency | Manufacturer = Russian Space Research Institute | Function = Neutron detector and dosimeter | Mission_Duration = Planned: 7 years[1] | Began = | Ceased = | Webpage = {{url|https://np.cosmos.ru/en-us/instruments/frend}} | Mass = {{conv|36|kg|abbr=on}} [2] | Spacecraft = ExoMars Trace Gas Orbiter | SC_Operator = ESA | Launch = 14 March 2016 | Rocket = Proton-M/Briz-M | launch_Site = Baikonur 200/39 | COSPAR = 2016-017A }} The Fine-Resolution Epithermal Neutron Detector (FREND) is a neutron detector that is part of the instrument payload on board the ExoMars Trace Gas Orbiter (TGO), launched to Mars in March 2016. This instrument is currently mapping hydrogen levels to a maximum depth of {{convert|1|m|ftin|abbr=on}} beneath the Martian surface, thus revealing shallow water ice distribution.This instrument has an improved resolution of 7.5 times over the one Russia contributed to NASA's Mars Odyssey orbiter. OverviewFREND can provide information while orbiting Mars on the presence of hydrogen, in the form of water or hydrated minerals in the top {{convert|1|m|ftin|abbr=on}} of the Martian surface.[3][4][5][6] Locations where hydrogen is found may indicate water-ice deposits, which is one of the key ingredients for life. Mapping ground ice could also be useful for future resource utilization (ISRU) and crewed missions.[7] FREND also features a dosimeter to monitor the radiation environment along its orbit around Mars.[2][7] ObjectivesThe main science objective of the instrument is to carry out high spatial resolution mapping of epithermal and fast neutron fluxes from the Martian surface.[4] FREND will work in synergy and complement orbital and ground data as measured the Dynamic Albedo of Neutrons (DAN) instrument on the Curiosity rover, the ADRON-RM instrument on the ExoMars rover and the ADRON-EM on the ExoMars 2020 surface platform.[4] The second goal of FREND is to use its dosimeter to measure the radiation dose at the TGO orbit from energetic particles of galactic cosmic rays and solar flares. The data will be used to estimate exposure levels of spacecraft and maintain radiation safety of crewed interplanetary flights.[2][7] Principle and development
FREND uses inherited technology developed by the Russian Space Research Institute and flown on the High Energy Neutron Detector (HEND) on Mars Odyssey; the Mercury Gamma and Neutron Spectrometer (MGNS) on BepiColombo; the Lunar Exploration Neutron Detector (LEND) on the Lunar Reconnaissance Orbiter, and Dynamic Albedo of Neutrons (DAN) on Curiosity rover.[2][4] This instrument's key components are four detectors containing tritium (3He) for neutrons with energies from 0.4 keV to 500 keV, and a stilbene-based scintillator for high-energy neutrons up to 10 MeV.[7] Each of the four 3He detectors counts neutrons independently for increased reliability.[7] All five detectors are encased within a collimator that improves the resolution 7.5 times over the one Russia contributed to NASA's Mars Odyssey orbiter.[7] The Principal Investigator is Igor G. Mitrofanov, from the Russian Space Research Institute (IKI).[4] Mitrofanov is also the PI for ExoMars' ADRON-RM and ADRON-EM neutron detector instruments.[9][10] See also
References1. ^{{cite web |url=http://exploration.esa.int/mars/46124-mission-overview/ |title=ExoMars Trace Gas Orbiter and Schiaparelli Mission (2016) |publisher=European Space Agency |date=16 October 2016 |accessdate=24 October 2016}} {{Exomars}}{{Satellite and spacecraft instruments}}{{Use British English|date=July 2018}}2. ^1 2 3 [https://www.lpi.usra.edu/meetings/marsconcepts2012/pdf/4209.pdf Fine Resolution Epithermal Neutron Detector (FREND) for mapping water from the ESA'S TGO.] (PDF) I. G. Mitrofanov, A. B. Sanin, A. V. Malakhov, Yu. I. Bobrovnitsky, T. M. Tomilina and F. V. Fedosov. Conference: Concepts and Approaches for Mars Exploration. 2012. 3. ^{{cite news |url=http://en.ria.ru/russia/20140804/191710468/Russia-to-Construct-Landing-Pad-for-Russian-European.html |title=Russia to Construct Landing Pad for Russian-European "ExoMars-2018" Space Mission |work=RIA Novosti |location=Russia |date=4 August 2014 |accessdate=5 August 2014}} 4. ^1 2 3 4 5 6 ExoMars Trace Gas Orbiter Instruments: FREND - Fine Resolution Epithermal Neutron Detector. European Space Agency. Accessed: 26 July 2018. 5. ^{{cite web |url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=2016-017A |title=ExoMars 2016 |work=National Space Science Data Center |publisher=NASA |accessdate=15 March 2016}} 6. ^{{cite news |last=Gannon |first=Megan |url=http://www.space.com/32250-exomars-mars-mission-science.html?adbid=10153371993821466&adbpl=fb&adbpr=17610706465 |title=The Science of ExoMars: New Mission to Hunt for Mars Life |work=Space.com |date=14 March 2016 |accessdate=16 March 2016}} 7. ^1 2 3 4 5 6 [https://np.cosmos.ru/en-us/instruments/frend FREND: Fine-Resolution Epithermal Neutron Detector for ExoMars Project]. Russian Space Research Institute (IKI), Nuclear Planetology Department. Accessed 26 July 2018. 8. ^Trace Gas Orbiter – Instrument Overview. Spaceflight 101. 9. ^{{cite web |title=ExoMars 2018 mission |url=http://www.iki.rssi.ru/eng/exomars2018.htm |publisher=Russian Space Research Institute |accessdate=15 March 2016}} 10. ^{{cite web |url=http://www.russianspaceweb.com/exomars_2016.html |title=The ExoMars Project |work=RussianSpaceWeb.com |accessdate=22 October 2013}} 4 : ExoMars|Mars imagers|Astrobiology|Space science experiments |
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