Error analysis of mechanical system and wavelength calibration of monochromator

The Review of Scientific Instruments
Fudong ZhangZhihong Wang

Abstract

This study focuses on improving the accuracy of a grating monochromator on the basis of the grating diffraction equation in combination with an analysis of the mechanical transmission relationship between the grating, the sine bar, and the screw of the scanning mechanism. First, the relationship between the mechanical error in the monochromator with the sine drive and the wavelength error is analyzed. Second, a mathematical model of the wavelength error and mechanical error is developed, and an accurate wavelength calibration method based on the sine bar's length adjustment and error compensation is proposed. Based on the mathematical model and calibration method, experiments using a standard light source with known spectral lines and a pre-adjusted sine bar length are conducted. The model parameter equations are solved, and subsequent parameter optimization simulations are performed to determine the optimal length ratio. Lastly, the length of the sine bar is adjusted. The experimental results indicate that the wavelength accuracy is ±0.3 nm, which is better than the original accuracy of ±2.6 nm. The results confirm the validity of the error analysis of the mechanical system of the monochromator as well as the validity of the c...Continue Reading

References

Sep 20, 2008·Applied Spectroscopy·Paul MartinsenTom Laurie
Jul 3, 2010·Optics Letters·Robert C YoungquistAndrea M Belanger
Nov 3, 2010·The Review of Scientific Instruments·Filippo Scotti, Ronald E Bell
Aug 23, 2011·Applied Optics·Tino PuegnerHubert Lakner
Sep 21, 2011·Applied Spectroscopy·Xuewei DuQiuping Wang
May 3, 2015·The Review of Scientific Instruments·Zhengang YuZhuangqi Cao
Jan 1, 2009·Journal of Research of the National Institute of Standards and Technology·A K GaigalasPaul DeRose

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