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- W4376604394 abstract "Abstract We developed a Multi-gas Trace-moisture Generator which was designed for generating trace water vapor (trace moisture) in multiple gases. Using this system, we previously developed primary measurement standards for trace moisture in N 2 (10 nmol mol -1 −5 μmol mol -1 ) and Ar (10 nmol mol -1 −1 μmol mol -1 ). In this study, we have extended the target gas species; trace-moisture standards in He and O 2 in the rage of 10 nmol mol -1 −1 μmol mol -1 were developed. The relative expanded uncertainty ( k =2) of the trace-moisture standard in He was 0.74 %−5.7 %, and that in O 2 was 0.78 %−8.9 %. In addition, we have improved stability of the flow rate of the diluent gas by controlling the temperature around the flow measurement/control systems and re-evaluated the uncertainty of the trace-moisture standards in N 2 and Ar. The updated relative expanded uncertainty ( k =2) of the trace-moisture standard in N 2 and Ar is 0.41 %−2.6 % and 0.73 %−2.6 %, respectively. The uncertainty budgets of the standards in these four gases are presented. The trace-moisture standard in N 2 developed using the Multi-gas trace-moisture generator was confirmed to be consistent with the standards realized by other generators, whose international comparability were already ensured. A commercial moisture analyzer (MA) based on the cavity ring-down spectroscopy (CRDS) was connected to the Multi-gas Trace-moisture Generator as a device under test, and its performance was evaluated by comparing the readings with the standard values. The MA showed lower accuracy and stability in the measurement of moisture in He when it was used in the default setting, whereas it performed well in N 2 . This performance difference is related to the pressure-broadening coefficient of water, which depends on the gas species. We estimated the pressure-broadening coefficients of water by N 2 , Ar, He and O 2 and discuss the gas-type dependence of the performance of CRDS-based MAs." @default.
- W4376604394 created "2023-05-17" @default.
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- W4376604394 date "2023-05-15" @default.
- W4376604394 modified "2023-10-12" @default.
- W4376604394 title "Primary measurement standards for trace moisture in multiple gases: Extension of gas species to He and O<sub>2</sub>" @default.
- W4376604394 doi "https://doi.org/10.1088/1681-7575/acd55a" @default.
- W4376604394 hasPublicationYear "2023" @default.
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