Absorption-line evaluation methods for wavelength standards

Changjiang Zhu; Leonard M. Hanssen

doi:10.1117/12.326657

8 October 1998 Absorption-line evaluation methods for wavelength standards

Changjiang Zhu, Leonard M. Hanssen

Proceedings Volume 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials; (1998) https://doi.org/10.1117/12.326657
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Two methods for absorption line (peak) evaluation based on center of gravity (CG) calculations are described and compared using spectra of the NIST standard reference material (SRM) 1921(a) characterization measurements. These methods are (1) calculating the CG of 50% of the absorption line and (2) an extrapolated center of gravity (ECG) method designed to determine the line minimum (peak maximum) location. Important parameters used in both methods are evaluated. The importance of the spectral data spacing on the accuracy of the CG calculation is examined in detail and quantified for the 1921a lines. The effects of the range of data as well as the fitting routine used in the extrapolation process (in the ECG method) on the final line minimum are examined. A comparison of the absorption line values determined from the SRM 1921(a) spectra by the two methods is presented.

Citation Download Citation

Changjiang Zhu and Leonard M. Hanssen "Absorption-line evaluation methods for wavelength standards", Proc. SPIE 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials, (8 October 1998); https://doi.org/10.1117/12.326657

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