Method and system for determining intrinsic linear function of Fourier transform spectrometer

Abstract

The invention discloses a method and system for determining the intrinsic linear function of a Fourier transform spectrometer. The method includes: obtaining the relative positional relationship between the optical axis of the Fourier transform spectrometer and the image plane of the detector; taking the closest point of the detector to the optical axis as the starting point, and taking the farthest point of the detector from the optical axis as the end point to determine the circumference The maximum value of the radius and the minimum value of the radius of the circle; according to the maximum value of the radius of the circle, the middle circle is determined; all the middle circles are divided into N sections of arcs with the same arc length; All intersecting points; accumulate all point values ​​to get the accumulated value; determine the proportional value of the arc length corresponding to the current radius according to the accumulated value and the number of divisions; obtain the frequency amplitude according to the proportional value; construct an inherent value based on multiple frequency amplitudes Linear function curve. The method or system of the invention solves the problem of difficulty in solving the analytical expression of the inherent linear function of the Fourier transform spectrometer and lack of universality.

Description

technical field [0001] The invention relates to the field of spectral analysis, in particular to a method and system for determining the inherent linear function of a Fourier transform spectrometer. Background technique [0002] Fourier transform spectroscopy is an important means of spectral analysis. The response of Fourier transform spectrometers to monochromatic light usually has a certain shape, called a linear function. The linearity function is mainly derived from two aspects. The first is the broadening caused by the apodization process, which is called the ideal linearity function; the second is the broadening caused by factors such as finite aperture and optical axis offset, which is called the intrinsic linearity function. Accurate analysis of the measurement spectrum requires an accurate grasp of the ideal linear function and the intrinsic linear function. Among them, the inherent linear function depends on the shape of the detector and its direct relative relat...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method and system for determining the inherent linear function of a Fourier transform spectrometer, which solves the problem that the analytical expression of the inherent linear function of the Fourier transform spectrometer is difficult to solve and does not have universality, and improves the data application of the Fourier transform spectrometer Level

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