光学学报, 2017, 37(11): 1112001, 网络出版: 2019-05-09

非线性双线原子荧光技术的标定新方法

New Calibration Method for Nonlinear Two-Line Atomic Fluorescence
作者单位

西北核技术研究所激光与物质相互作用国家重点实验室, 陕西 西安 710024

摘要
针对非线性双线原子荧光技术(NTLAF)测温过程复杂度高的问题,提出了利用可调谐二极管吸收光谱技术(TDLAS)的标定方法。该方法将三个标定常数合并为一个,由荧光强度与TDLAS实时路径积分温度迭代求解获得该标定常数,最后获得温度。借助数值方法模拟了利用TDLAS标定NTLAF温度的过程,分析了不同温度分布及迭代初值对该方法的影响。温度反演结果与传统使用点标定方法的精度近似相等,温度反演误差均小于5%;不同温度分布对该标定方法的影响较小;选用合适的迭代初值,总能够获得唯一的标定常数。
Abstract
This work aims at covering the shortage of the complex measurement procedure of nonlinear two-line atomic fluorescence (NTLAF), and a new calibration method based on tunable diode laser absorption spectroscopy (TDLAS) is proposed. First, three calibration constants are combined into one. The new constant is calculated by an iteration of the fluorescence intensity and TDLAS real-time path integral temperature. Finally, the temperature profile is deduced. Numerical simulations for the calibration of NTLAF temperature by TDLAS are performed. The influence of temperature profiles and initial values is analyzed. The precision of the simulation results is almost equivalent to that obtained by conventional point-wise temperature calibration methods, and the uncertainty is within 5%. Different temperature profiles have little influence on this calibration method. A proper initial value will always result in the same final value.
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