光電直讀光譜儀測定管線鋼中元素含量的不確定度評定

Uncertainty Evaluation of Measurement of Chemical Element Contents in Linepipe-purposed Steel with Photoelectric Direct-reading Spectrometer

摘要: 依據(jù)JJF 1059.1—2012標準，以碳、硅、錳、磷、硫含量為例，分析了光電直讀光譜儀測定管線鋼中元素含量不確定度的來源，建立數(shù)學模型，并對管線鋼中各元素含量測定結(jié)果的不確定度進行評定，確定和計算測定過程中各個不確定度分量。比較發(fā)現(xiàn)：B類標準不確定度是光譜分析中不確定度的主要來源，標樣定值時的不確定度及測量時光譜儀引入的不確定度對總不確定度的影響最大。

Abstract: Based on Standard JJF 1059.1—2012，and taking the content measurements of C，Si，Mn，P and S as examples，the source of the uncertainty in chemical element content measurement of linepipe-purpose steel with the photoelectric direct-reading spectrometer is analyzed，and accordingly related math model is established.Furthermore，the uncertainty of the content measurement result of each chemical element in the said steel is evaluated so as to determine and calculate the component products of each uncertainty as occurring in the measurement process.Relevant comparison result shows that Type B standard uncertainty is the main source of the uncertainty in spectroscopic analysis，while the uncertainty from reference sample value determination together with the uncertainty as induced by the spectrometer during the measurement process mostly affect the general uncertainty.