17 May 2016 Validation of accelerated ageing of Thales rotary Stirling cryocoolers for the estimation of MTTF
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Abstract
The cooled IR detectors are used in a wide range of applications. Most of the time, the cryocoolers are one of the components dimensioning the lifetime of the system. The current market needs tend to reliability figures higher than 15,000hrs in “standard conditions”. Field returns are hardly useable mostly because of the uncertain environmental conditions of use, or the differences in user profiles. A previous paper explains how Thales Cryogenics has developed an approach based on accelerated ageing and statistical analysis [1]. The aim of the current paper is to compare results obtained on accelerated ageing on one side, and on the other side, specific field returns where the conditions of use are well known. The comparison between prediction and effective failure rate is discussed. Moreover, a specific focus is done on how some new applications of cryocoolers (continuous operation at a specific temperature) can increase the MTTF. Some assumptions are also exposed on how the failure modes, effects and criticality analysis evolves for continuous operation at a specific temperature and compared to experimental data.
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C, Seguineau, C, Seguineau, J.-M. Cauquil, J.-M. Cauquil, J.-Y. Martin, J.-Y. Martin, T. Benschop, T. Benschop, } "Validation of accelerated ageing of Thales rotary Stirling cryocoolers for the estimation of MTTF", Proc. SPIE 9821, Tri-Technology Device Refrigeration (TTDR), 98210S (17 May 2016); doi: 10.1117/12.2241208; https://doi.org/10.1117/12.2241208
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