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相对地传统深能级瞬态谱(DLTS)方法,快速傅立叶变换深能级瞬态谱(FFT-DLTS)方法具有灵敏度高,分辨率高等特点,但是由于用FFT0DLTS方法在处理多能级DLTS系统时存在着系统误差从而限制了该方法的应用,论证了该误差产生的原因并提出用迭代法来解多能级的傅立叶系数谱的方法,有效地解决了传统FFT-DLTS方法所存在的问题,且能级分辨率又有显著的提高。 相似文献
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Degradation tests are often used to assess the reliability of products with long failure-time or few test units. Much of the previous work on reliability assessment methods has focused on constant-stress degradation test( CSDT) and accelerated degradation test( ADT), mainly under the constant, step or progressive stresses. However,in actual testing environments,some stresses are difficult to control and vary with time irregularly,which are quite different from the three stresses mentioned above. In this paper a new approach was presented for reliability assessment with degradation data under irregular time-varying-stress( ITVS).Firstly,the conventional degradation path modeling method was improved by taking into account the influences of the variable stress on the degradation variable. Then,an example was conducted to show the effectiveness of our improved model. 相似文献