Di Wang

Inner Mongolia University

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Han Tao

Zhejiang University

Huang-He Qian

State Key Laboratory of Modern Optical Instruments

Zhiyi Liu

Zhejiang University

Xi Kang Zhang

Inner Mongolia University

Yang Jiang

Hefei University

Zhihua Ding

Zhejiang University

Li Fan

Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital

Guan Feng Li

Inner Mongolia University

Zhihua Ding

China University of Mining and Technology

Xing Xiao

Inner Mongolia University

Cooperative Institutions

Zhejiang University

Inner Mongolia University

China University of Mining and Technology

State Key Laboratory of Modern Optical Instruments

Shandong University

Chang'an University

Shanghai Jiao Tong University

China University of Petroleum, East China

Southeast University

Shaanxi University of Technology

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An Absolute Wavenumber Calibration Method based on Characteristic Spectral Line and Constrained Fitting Phase

Acta Physica Sinica (2022)

Di Wang Han Tao Huang-He Qian Zhiyi Liu Zhihua Ding

Spectral-domain Optical Coherence Tomography (SD-OCT) systems generally have nonlinear sampling problems in wavenumber domain. In order to realize the precise positioning of the discrete interfaces and the high-quality reconstruction of OCT images under conventional fast Fourier transform, it is necessary to solve the precise calibration problem of the absolute wavenumber of the discrete sampling points in the spectrometer. In this paper, an absolute wavenumber calibration method based on the absolute phase of the characteristic spectral line and the constraint polynomial fitting phase under precise optical path difference was proposed. In the sample arm of the SD-OCT system, metal gauges with precise thickness difference are used to obtain the absolute phase value of the characteristic spectral line, and the phase wrapping times corresponding to the characteristic spectral line are further accurately solved. Thus, this method overcomes the 2π ambiguity of spectral phase in conventional interferometric phase methods. At the same time, combined with the polynomial fitting phase of the high signal-to-ratio region under window constraint, the accurate calibration of the absolute wavenumber of each sampling point is realized. Finally, comprehensive comparisons between the proposed method and the traditional resampling method in terms of discrete interface positioning, axial resolution and image reconstruction quality verifies the significant advantages of this method.

Wavenumber

Absolute phase

10.7498/aps.7120220314

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Optimization-based parameter search of support vector regression for high-temperature compression constitutive modeling of 25CrMo4 steel

AIP Advances (2023)

Guan Feng Li Yang Jiang Li Fan Xing Xiao Xi Kang Zhang

An accurate intrinsic structural model is essential to describing the high-temperature deformation behavior of metal materials. Support Vector Regression (SVR) has strong regression analysis capabilities, but its application research in constructing constitutive models of 25CrMo4 steel still needs to be improved. In this study, we use grid search, particle swarm optimization, improved genetic algorithm, and improved gray wolf optimization to optimize SVR parameters. A constitutive relationship model for 25CrMo4 steel under high-temperature compression based on SVR was established through training using experimental data models. The predicted data of SVR constitutive models with different optimization algorithms were compared with experimental data. Statistical values, such as average absolute percentage error (AAPE), mean absolute percentage error (MAPE), and correlation coefficient (R2), were introduced to evaluate the accuracy of each model. The particle swarm optimization-SVR model achieved the best performance, with an AAPE of 0.455 38, MAPE of 0.489 09%, and R2 of 0.999 74. Furthermore, compared to other models, it requires the least time. This model has a higher accuracy than other commonly used instantaneous models. These findings can provide a basis for selecting appropriate deformation parameters and preventing hot working defects of 25CrMo4 steel, thus helping to improve the manufacturing process and material properties.

Hyperparameter Optimization

10.1063/5.0174034

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An absolute wavenumber calibration method based on characteristic spectral line and constrained fitting phase

Acta Physica Sinica (2022)

Di Wang Han Tao Huang-He Qian Zhiyi Liu Zhihua Ding

Spectral-domain optical coherence tomography (SD-OCT) systems generally have nonlinear sampling problems in wavenumber domain. In order to realize the precise positioning of the discrete interfaces and the high-quality reconstruction of OCT images under conventional fast Fourier transform, it is necessary to solve the precise calibration problem of the absolute wavenumber of the discrete sampling points in the spectrometer. In this work, an absolute wavenumber calibration method is proposed based on the absolute phase of the characteristic spectral line and the constraint polynomial fitting phase under precise optical path difference. In the sample arm of the SD-OCT system, the metal gauges with precise thickness difference are used to obtain the absolute phase value of the characteristic spectral line, and the phase wrapping times corresponding to the characteristic spectral line are further accurately solved. Thus, this method overcomes the 2π ambiguity of spectral phase in conventional interferometric phase methods. At the same time, combined with the polynomial fitting phase of the high signal-to-noise ratio region under window constraint, the accurate calibration of the absolute wavenumber of each sampling point is realized. Finally, comprehensive comparison between the proposed method and the traditional resampling method in terms of discrete interface positioning, axial resolution and image reconstruction quality verifies the significant advantages of this method.

Wavenumber

Absolute phase

10.7498/aps.71.20220314

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