Error analysis and correction method of infrared interference signal sampling

Abstract

Abstract: Fourier transform infrared (FTIR) spectroscopy system uses He-Ne laser interference signal as a reference signal, but there is zero crossing sampling error. Based on the principle of light interference, a theoretical simulation model between FTIR spectroscopy sampling error and spectral ghost line position and intensity is established by Fourier transform. In order to reduce the sampling error, the cubic spline interpolation method is used to correct the zero crossing error, and intensity of the infrared optical interference signal is reconstructed by linear interpolation method. Results show that the model can be used as a theoretical basis for spectral error correction algorithm caused by sampling error. The cubic spline interpolation method can reduce the sampling error on reconstruction of He-Ne signal zero-crossing, and the error range is reduced by 93%. The linear interpolation method is applied to reconstruction of the infrared light intensity signal, which can improve the spectral signal to noise ratio, with an average increase of 5.7%.

Key words: Fourier optics, Fourier transform infrared spectrometer, Brault sampling method, sampling error analysis

LI Yakai1,2,3, XU Liang1,3, JIN Ling1,3, LI Sheng1,3, YE Shubin1,2,3, HU Rong1,2,3, . Error analysis and correction method of infrared interference signal sampling[J]. Chinese Journal of Quantum Electronics.

References

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