Traceable ammonia quantification and metrological uncertainty evaluation in a shock tube

D. Zhu, S. Agarwal, B. Shu, R. Fernandes, Z. Qu

Abstract

This work emphasizes on the development of an ultra-rapid spectrally resolved tunable diode laser absorption spectroscopy (TDLAS)-based spectrometer with a scan frequency of 40 kHz for dynamic NH3 quantification in a shock tube. Thanks to the high laser scan frequency, the NH3 mole fraction at various stages during the dynamic process can be quantified. Besides, considering lacking metrology in shock tubes for dynamic studies, we comprehensively evaluated the uncertainty sources and budgets of thermodynamic parameters and species concentration based on Guide to the expression of uncertainty in measurements (GUM). The established metrological uncertainty evaluation method for shock tube experiments can be beneficial to provide traceable and high-quality data, which is vital for dynamic studies as well as chemical kinetic modelling.

Keywords

Ammonia, TDLAS, Shock tube, Uncertainty budget

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IMEKO-TC24-2023-01.pdf

DOI

10.21014/tc24-2023.01

IMEKO TC

TC24 - Chemical Measurements

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