Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Polarization interference spectrum restoration correction method

A technology of interference spectrum and polarization, which is applied in the field of Fourier transform spectrum restoration, can solve the problems of spectral distortion, inability to accurately restore the spectrum, and the inability to use NUFFT algorithm, etc., and achieve the effect of mature algorithm

Active Publication Date: 2017-01-11
重庆中科摇橹船信息科技有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, for a single wavelength, the phase change and the scanning amount are linear, which is consistent with the classical Michelson interference, so the NUFFT algorithm cannot be used; secondly, the ratio of the modulation frequency of different wavelengths depends on the wave number and birefringence The product of the rate difference, so FFT cannot be used directly, otherwise it will cause serious spectral distortion
In summary, for polarization interference spectroscopy, neither traditional FFT nor NUFFT can accurately restore the spectrum

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polarization interference spectrum restoration correction method
  • Polarization interference spectrum restoration correction method
  • Polarization interference spectrum restoration correction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The birefringent crystal of the polarization interferometer is a phase compensation device, and the two beams participating in the interference have a common optical path. Compared with the traditional Michelson and other double-branch interferometers, there is no separation and combination of beams, and it has natural non-dissonance and excellent Anti-interference ability, has broad application prospects in online analysis.

[0032] The present invention proposes a correction method for polarization interference spectrum restoration, comprising the following steps:

[0033] 1] Pretreatment

[0034] The preprocessing includes interference signal sampling, noise reduction and phase correction; determine the number of Fast Fourier Transform (FFT) points N; determine the wavenumber range v 0 ~v 1 ;

[0035] 2] Fourier transform

[0036] The FFT algorithm is used to calculate the interference signal obtained by preprocessing, and the wave number v' is obtained 1 with w...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to a polarization interference spectrum restoration correction method comprising the following steps of 1) preprocessing; the preprocessing includes interference signal sampling, noise reduction and phase correction; the points N of fast Fourier transform (FFT) are determined; and the wave number range v0-v1 is determined; 2) Fourier transform: the interference signals obtained through preprocessing are calculated by using the FFT algorithm; 3) correction; and 4) coordinate transform. According to the polarization interference spectrum restoration correction method, the wave number obtained through FFT can be fast and effectively compensated one by one by using the mode of software algorithm by only determining the material properties of a phase compensator.

Description

technical field [0001] The invention relates to the field of Fourier transform spectrum restoration, in particular to a correction method for polarization interference spectrum restoration. Background technique [0002] For the classic Michelson interferometric spectrometer, the change of the optical path difference at any wavelength during the scanning of the moving mirror is theoretically consistent. The phase change of the cosine interference curve at any wavelength mainly depends on the wave number and the scanning amount, and the ratio of the modulation frequencies of different wavelengths is equal to the ratio of the wave number. Therefore, for polychromatic light, the spectral curve can be accurately restored by performing fast Fourier transform (FFT) directly. For some nonlinear interference signals such as elastic optical modulation interference, the phase change has a nonlinear relationship with the scanning amount, and the Fourier transform is only applicable to ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/45
CPCG01J3/45
Inventor 谢正茂韦明智齐文博薛艳博王维何俊华
Owner 重庆中科摇橹船信息科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com