A method for accurately restoring the large-angle nonlinear interference spectrum of a rotating mirror Fourier transform spectrometer

CN115684124BActive Publication Date: 2024-12-31NANCHANG UNIV
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Patent Information

Application Number
CN202211258575.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-14
Publication Date
2024-12-31
Estimated Expiration
2042-10-14

AI Technical Summary

Technical Problem

The nonlinear path difference generated by the rotational mirror Fourier transform spectrometer during rotation makes it impossible to accurately restore the spectral signal directly through fast Fourier transform. The existing interpolation method is difficult to restore the original complete interference signal curve, limiting the large-angle non-turn Accurate recovery of linear interference spectrum.

Method used

Using an intelligent interpolation method based on neural networks, through spectrum calculation and transform relationship learning of BP neural network, the accurate reconstruction of non-equal interval interference signals is achieved into equal interval signals, thereby achieving accurate recovery of large-angle nonlinear interference spectrum.

Benefits of technology

The spectral resolution is improved, the calculation time is reduced, and the high-accuracy equally spaced interference signal is obtained, achieving accurate recovery of the large-angle nonlinear interference spectrum of Turbo FTS.

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Abstract

The present invention discloses a method for accurately restoring a large-angle nonlinear interference spectrum of a rotating mirror Fourier transform spectrometer, comprising the steps of: detecting a non-equal (optical path difference) interval (sampling) interference signal of incident light through an optical system of a rotating mirror Fourier transform spectrometer; calculating the spectrum of the non-equal-interval interference signal through a spectrum calculation method; using a constructed BP neural network to transform the spectrum of the non-equal-interval interference signal into a spectrum of a 10-fold equal-interval (sampling) interference signal; reconstructing a complete interference signal of the incident light according to the spectrum of the 10-fold equal-interval (sampling) interference signal, and correcting its intensity and position; performing 10-fold equal (optical path difference) interval secondary sampling on the reconstructed complete interference signal to obtain an equal-interval interference signal of the incident light. The present invention can realize the restoration of a large-angle nonlinear interference spectrum of a Turbo FTS, improve the spectral resolution, and reduce the calculation time.
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