基于最小二乘法的氦質譜非真空累積檢漏方法研究
綦磊，孫立臣，洪曉鵬，王勇，任國華
北京衛星環境工程研究所
RESEARCH ON NON-VACUUM ACCUMULATION LEAK TESTING BY HELIUM MASS SPECTROSCOPY BASED ON LEAST SQUARE METHOD
QI Lei，SUN Li-chen，HONG Xiao-peng，WANG Yong，REN Guo-hua
Beijing Institute of Spacecraft Environment Engineering

摘要：航天器的密封性能測試分為部組件級測試和系統級測試。系統級密封性能測試大多采取氦質譜非真空累積檢漏法，由于收集室內氦氣濃度分布不均勻，檢漏儀讀數不穩定，漏率初值或終值的讀取可能不準確，進而造成測量誤差。提出一種基于最小二乘法擬合的氦質譜非真空累積檢漏方法，在非真空累積過程中，多次讀取收集室內漏率值，并利用最小二乘法對漏率變化率進行擬合，進而求出被檢件漏率。大量試驗結果表明，與傳統的氦質譜非真空累積檢漏法相比，該方法可有效避免單次數據測量造成的測量誤差，具有更高的數據可信度。

關鍵詞：航天器,  氦質譜檢漏,  非真空累積,  最小二乘法    
Abstract：Spacecraft leak testing is divided into component testing and system testing. System leak test mostly take the method of non-vacuum accumulation leak testing by helium mass spectroscopy. Due to the uneven distribution of helium in the accumulation chamber and the unstable readings of helium mass spectrometer leak detector，the initial and final leakage rate values may not be read accurately which may result in the measurement error. In this paper，a non-vacuum accumulation leak testing by helium mass spectroscopy based on least square method is introduced. In the process of helium gas accumulation，read the helium gas density in the accumulation chamber at regular intervals and calculate the helium gas density charge rate using least square method. Then，the leakage rate of the object under test is given. A large number of test results show that，compared with the traditional methods，this method can effectively avoid the measurement error caused by single testing and the results have a higher credibility.

Key words：spacecraft    helium mass spectroscopy    non-vacuum accumulation    least square method
    
基金資助:國家自然基金（U1537109）、載人航天預先研究（020109）

作者簡介: 綦磊（1985-），男，山東濰坊人，工程師，碩士，主要從事航天器密封性能測試技術研究

引用本文: 綦磊，孫立臣，洪曉鵬，王勇，任國華. 基于最小二乘法的氦質譜非真空累積檢漏方法研究[J]. 真空與低溫, 2017, 23(3): 154-.
QI Lei，SUN Li-chen，HONG Xiao-peng，WANG Yong，REN Guo-hua. RESEARCH ON NON-VACUUM ACCUMULATION LEAK TESTING BY HELIUM MASS SPECTROSCOPY BASED ON LEAST SQUARE METHOD. journal1, 2017, 23(3): 154-.

文章來源：《真空與低溫》雜志2017年23卷3期

刊出日期：2017-06-28

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