Anti-noise frequency estimation performance of Hanning-windowed energy centrobaric method for optical coherence velocimeter

Zhang, Qiukun; Zhong, Shuncong; Lin, Jiewen; Huang, Yuexin; Nsengiyumva, Walter; Chen, Weiqiang; Luo, Manting; Zhong, Jiangfeng; Yu, Yingjie; Peng, Zhike; Cheng, Shuying

doi:10.1016/j.optlaseng.2020.106250

Cited by 15 publications

(7 citation statements)

References 26 publications

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“…Aim to improve the optical path measurement accuracy, it is necessary to find the method of extracting the number of cycles of interference fringes that can realize high accuracy and non-integer cycle resolution. The method used in this paper is the energy spectrum gravity method based on the Hanning window [28,29]. High precision estimation of interference signal frequency f can be achieved by the following formula.…”

Section: Principle Of High-precision Optical Path Measurement Based O...mentioning

confidence: 99%

“…If the accurate frequency of the signal want to be calculated, select 2n + 1 points near the peak (usually n takes 3 ∼ 7) and calculate according to the above formula. By applying the Hanning window energy spectrum correction principle, the measurement accuracy of the optical path can be greatly improved to the nanometer or even subnanometer level [29].…”

Section: Principle Of High-precision Optical Path Measurement Based O...mentioning

confidence: 99%

“…Due to the existence of noise, the calculation accuracy of optical path is limited. In our previous research [29], the calculation accuracy of the optical path in this case is related to the peak value of the signal, and the relationship is as follows:…”

Section: Experimentation and Signal Processingmentioning

confidence: 99%

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Simultaneous measurement of thickness and group refractive index in birefringent crystals

Yangmei,

Qiukun

2024

Meas. Sci. Technol.

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In order to measure the group refractive index and thickness of birefringent crystals simultaneously, a method based on spectral-domain interferometry is proposed. The optical path of each reflection layer of birefringent crystal is converted into spectral interference fringe of corresponding frequency by the principle of spectral-domain interferometry, and the accurate optical path calculation is realized by fast Fourier transform and Hanning-windowed energy centrobaric method. A two-step measurement method was designed to measure the crystal thickness and group refractive index of ordinary(o) and extraordinary(e) light synchronously by comparing the changes of the optical path before and after the insertion of the sample. The comparison between experimental and theoretical results of LiNbO3 crystals shows that the accuracy of the thickness measured by this system is better than 1μm and the relative error of the group refractive index is better than 0.15%. The measurement method is simple to implement and has high precision, which is of practical significance for realizing the rapid and high-precision measurement of optical parameters of birefringent crystals.

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Section: Principle Of High-precision Optical Path Measurement Based O...mentioning

confidence: 99%

Section: Principle Of High-precision Optical Path Measurement Based O...mentioning

confidence: 99%

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Simultaneous measurement of thickness and group refractive index in birefringent crystals

Yangmei,

Qiukun

2024

Meas. Sci. Technol.

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“…For broadband lights, the group refractive index is defined as the ratio of the group velocity of lights in the vacuum and the velocity in the medium, while the refractive index is the ratio of the velocity of single wavelength light in the vacuum and the medium [4]. To address this issue, this paper presents a novel method that combines the HnWECM and OCT to measure the geometric thickness of the sample with high precision, without the influence of its group refractive index [5]. The accuracy and feasibility of our novel method were verified by comparing the thickness of the peeled-off self-lubricating fabric liner of the bearing, measured by our novel method and spiral micrometer.…”

Section: Introductionmentioning

confidence: 99%

Thickness Measurement of Self-Lubricating Fabric Liner of Inner Ring of Sliding Bearings Using Spectral-Domain Optical Coherence Tomography

et al. 2023

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This study presents a novel and highly accurate method of measuring the geometric thickness of the self-lubricating fabric liner of bearings by combining the optical coherence tomography (OCT) technology and the Hanning-windowed energy centrobaric method (HnWECM). The geometric thickness of wear-resistant coating material is one of the important indicators for evaluating its wear, and the measurement of its geometric thickness is of great significance for preventing coating failure. To address the issue of significant measurement errors caused by using the refractive index of the sample instead of the group refractive index to calculate the material’s geometrical thickness in previous OCT research and applications, our proposed method can accurately measure the geometrical thickness of materials without the influence of the refractive index of the material. Moreover, this method exhibits the advantages of non-contact and high precision, since it utilizes an SD-OCT system, making it a novel method for extracting the physical parameters of composite materials. The geometric thickness of the peeled-off liner obtained from our method is compared with the thickness measured by the spiral micrometer to evaluate its accuracy. The experimental results indicate that the thickness measured by the spiral micrometer was 172 μm, while the maximum difference in the data obtained by our method was 171.261 μm. This suggests that the difference between the two methods is less than 0.430%, which verifies the accuracy and validity of our method. Additionally, the obtained geometric thickness and the optical thickness of the peeled-off liner are used to evaluate the group refractive index of this material. The inside geometrical structure of the self-lubricating fabric liner on the end face and inner ring of the sliding bearing is imaged with this group refractive index. The measurement of the inner ring liner of the sliding bearing proves the flexibility of the fiber-optic OCT and provides a non-contact, nondestructive testing method for measuring the geometric thickness and internal geometric structure of composite materials.

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“…Many researchers have investigated the interferences from spectral components, wideband noise, and other precision factors related to the estimated parameters [ 16 , 17 ]. This algorithm has fast speed and great accuracy of frequency calculation, so it has been applied to engineering after improvement [ 18 ]. However, the correction accuracy is too dependent on the symmetric window function and is easily affected by white Gaussian noise (WGN).…”

Section: Introductionmentioning

confidence: 99%

A Spectrum Correction Algorithm Based on Beat Signal of FMCW Laser Ranging System

Hao

Song

Wang

et al. 2021

Sensors

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The accuracy of target distance obtained by a frequency modulated continuous wave (FMCW) laser ranging system is often affected by factors such as white Gaussian noise (WGN), spectrum leakage, and the picket fence effect. There are some traditional spectrum correction algorithms to solve the problem above, but the results are unsatisfactory. In this article, a decomposition filtering-based dual-window correction (DFBDWC) algorithm is proposed to alleviate the problem caused by these factors. This algorithm reduces the influence of these factors by utilizing a decomposition filtering, dual-window in time domain and two phase values of spectral peak in the frequency domain, respectively. With the comparison of DFBDWC and these traditional algorithms in simulation and experiment on a built platform, the results show a superior performance of DFBDWC based on this platform. The maximum absolute error of target distance calculated by this algorithm is reduced from 0.7937 m of discrete Fourier transform (DFT) algorithm to 0.0407 m, which is the best among all mentioned spectrum correction algorithms. A high performance FMCW laser ranging system can be realized with the proposed algorithm, which has attractive potential in a wide scope of applications.

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Anti-noise frequency estimation performance of Hanning-windowed energy centrobaric method for optical coherence velocimeter

Cited by 15 publications

References 26 publications

Simultaneous measurement of thickness and group refractive index in birefringent crystals

Simultaneous measurement of thickness and group refractive index in birefringent crystals

Thickness Measurement of Self-Lubricating Fabric Liner of Inner Ring of Sliding Bearings Using Spectral-Domain Optical Coherence Tomography

A Spectrum Correction Algorithm Based on Beat Signal of FMCW Laser Ranging System

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