کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1717246 1013433 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
SMA gas release mechanism for the Rosetta Lander's Ptolemy instrument
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی هوافضا
پیش نمایش صفحه اول مقاله
SMA gas release mechanism for the Rosetta Lander's Ptolemy instrument
چکیده انگلیسی

The Ptolemy instrument on the Rosetta comet lander “Philae” is an advanced gas analyser. The instrument relies on a supply of ultra-clean helium gas to carry cometary matter through a series of gas chromatography columns and high temperature reactors, into a mass spectrometer. The helium is stored in a pair of titanium gas tanks, pressurised to 50 bar. The use of a conventional valve to seal the tanks would lead to a high loss of helium through leakage over the long period of dormancy involved in this mission (15 years from filling to use). Instead, the tanks are sealed with a hollow “frangible pillar”, which is broken with a shape memory alloy (SMA) actuator to release the gas on reaching the comet.This article describes the SMA mechanism, which provided an effective, low mass, low power, clean solution to the problem of helium storage and release.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Astronautica - Volume 58, Issue 11, June 2006, Pages 576–582
نویسندگان
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