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学者姓名：张秋坤
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Abstract ：
To enhance the diagnostic capabilities of defective epoxy coating structures using terahertz non-destructive testing technology, this paper proposed a multiple damage identification algorithm based on multi-domain feature fusion and machine learning. Three typical defect types of coating structure with three severity levels were investigated. Firstly, Finite-Difference Time-Domain (FDTD) modelling generated terahertz pulsed imaging (TPI) signals for various defective structures, incorporating ageing-induced property variations. Secondly, time domain, frequency domain and wavelet packet energy parameters were extracted, then filtered via the importance analysis using an improved random forest method to obtain the critical features sensitive to the defective structures. Subsequently, the selected features were reconstructed into optimised eigenvectors and processed through a cascading Support Vector Machines (SVM) classifier with Particle Swarm Optimisation (PSO) algorithm. Defect types classification and defect severity assessment were implemented through the cascading classifier. Compared to the traditional single-stage multiclass classifier, the proposed feature filtering algorithm significantly enhanced discriminative feature precision and better captured critical coating structural characteristics. This optimisation ultimately improved defect classification accuracy and reliability. The results indicated that the method was effective and could be recommended for the actual application.
Keyword ：
machine learning machine learning Multi-domain feature Multi-domain feature terahertz pulsed imaging terahertz pulsed imaging various internal defect detection various internal defect detection
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| GB/T 7714 | Tu, Wanli , Zhong, Shuncong , Zhang, Qiukun et al. Multiple damage identification of epoxy coating structures based on terahertz pulse imaging technology and machine learning [J]. | NONDESTRUCTIVE TESTING AND EVALUATION , 2025 . |
| MLA | Tu, Wanli et al. "Multiple damage identification of epoxy coating structures based on terahertz pulse imaging technology and machine learning" . | NONDESTRUCTIVE TESTING AND EVALUATION (2025) . |
| APA | Tu, Wanli , Zhong, Shuncong , Zhang, Qiukun , Huang, Yi , Luo, Manting . Multiple damage identification of epoxy coating structures based on terahertz pulse imaging technology and machine learning . | NONDESTRUCTIVE TESTING AND EVALUATION , 2025 . |
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To adapt the demands of the high-speed and real-time dynamic measurements, a linear array sensor (LAS) and projection fringe-based vision system was proposed to measure the radial vibration of rotating shaft. The projection lamp projects fringe pattern onto the surface of the shaft, and the LAS captures the modulated fringe sequences for tracking the vibration signal using a proposed fringe signal processing method. Simulations using 3-D software were carried out first to verify the feasibility of the method, and the performance of the system was analyzed and investigated by simulations and experiments. In the experiments, the proposed system and the eddy current sensor (ECS)-based system were employed to simultaneously measure the shaft vibration under constant and variable rotating speed conditions for comparison. The result showed that the system can measure the radial vibration of the rotating shaft accurately using 1-D fringe signal. The LAS-based system has the advantages of high accuracy, low cost, and small data for processing, which makes it suitable for vibration monitoring and fault diagnosis for rotating shaft.
Keyword ：
Current measurement Current measurement Displacement measurement Displacement measurement Linear array sensor (LAS) camera Linear array sensor (LAS) camera Machine vision Machine vision Monitoring Monitoring Optical imaging Optical imaging Optical sensors Optical sensors projection fringe projection fringe radial vibration radial vibration rotating shaft rotating shaft Sensor arrays Sensor arrays Shafts Shafts vibration measurement vibration measurement Vibration measurement Vibration measurement Vibrations Vibrations
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| GB/T 7714 | Liu, Dongming , Zhong, Jianfeng , Chi, Shoujiang et al. Linear Array Sensor-Based Vision System for Shaft Radial Vibration Sensing Using Projection Fringe [J]. | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2025 , 74 . |
| MLA | Liu, Dongming et al. "Linear Array Sensor-Based Vision System for Shaft Radial Vibration Sensing Using Projection Fringe" . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 74 (2025) . |
| APA | Liu, Dongming , Zhong, Jianfeng , Chi, Shoujiang , Zhang, Qiukun , Peng, Zhike , Zhong, Shuncong . Linear Array Sensor-Based Vision System for Shaft Radial Vibration Sensing Using Projection Fringe . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2025 , 74 . |
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Accurate rotational speed measurement is a prerequisite for realizing the condition monitoring and fault diagnosis of rotating equipment. This study proposes a novel rotational speed measurement method based on optical coherent displacement measurement. An optical coherence system is used to measure the relative depth of the shaft surface with uniformly etched micro-indentations on the circumferential surface. Fast Fourier transform (FFT) and the Hanning window energy centrobaric method (HnWECM) are used to process the collected photoelectric signals to obtain depth information and thereby realize the measurement of surface microindentations. During the operation, the rotational speed of the shaft is obtained by calculating the ratio of the angular difference between the relative depth of the rectangular pulses of the surface and the time interval. The experimental validation of the response is performed. The experimental results show that in the range of 0 rpm to 60 rpm, the indication error is <1 %, the nonlinearity error is <0.3584 %, and the repeatability error is <0.28 %. In the range of 0 rpm to 600 rpm, the rotational speed measurement method performed well with an indication error of <0.5 %, a maximum nonlinear error of 0.22 %, and a repeatability error of no >0.28 %. Compared with the results reported in existing literature, the proposed method offers advantages in terms of accuracy, linearity, and repeatability.
Keyword ：
FFT FFT Hanning window Hanning window Micro-indentation Micro-indentation Optical measurement Optical measurement Rotational speed measurement Rotational speed measurement
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| GB/T 7714 | Liang, Wei , Hong, Xiaodong , Huang, Dichang et al. Novel rotational speed measuring method based on micro-indentation-shaft detected by optical coherent system [J]. | OPTICS AND LASERS IN ENGINEERING , 2025 , 184 . |
| MLA | Liang, Wei et al. "Novel rotational speed measuring method based on micro-indentation-shaft detected by optical coherent system" . | OPTICS AND LASERS IN ENGINEERING 184 (2025) . |
| APA | Liang, Wei , Hong, Xiaodong , Huang, Dichang , Chen, Linnan , Zhong, Jianfeng , Zhang, Qiukun et al. Novel rotational speed measuring method based on micro-indentation-shaft detected by optical coherent system . | OPTICS AND LASERS IN ENGINEERING , 2025 , 184 . |
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Active absorption modulation is critical for advanced stealth technologies, especially given the emerging detection threat from terahertz atmospheric windows. However, due to the difficulty in balancing high absorption and tunability, the actual manufacturing of most terahertz absorbers usually neglects the integration of electrical tuning, which limits their development of dynamic wave trapping for electronic countermeasure systems. Here, a terahertz stealth metamaterial (TSM) with hierarchical ionotronic architecture is proposed to overcome the tradeoff. Large-area continuous MoS2 assemblies tightly attached poly(ionic liquid) (PIL) microarrays provide enough conditions for surface electron conduction and plasmon mode excitation. By establishing wave-electron-ion interaction pathways, the directional migration of free anions inside the PIL and the accumulation of excess charge carriers up to 100.4% at the MoS2 interfaces are promoted, thereby stimulating changes in the plasma frequency of the absorption system. Consequently, this micro-nano structural design enhances the absorption tunability and combines multiple dissipative behaviors. TSM exhibit high specific attenuation (-275 dB mm(-1)), frequency agility (21.4%), and phase switching (153.1 deg.) within terahertz atmospheric windows. Moreover, the template-assisted assembly strategy adopted has the potential to be used for the building of universal blocks operating within other frequency ranges.
Keyword ：
electric tuning electric tuning metamaterial metamaterial MoS2 MoS2 poly(ionic liquid) poly(ionic liquid) terahertz stealth terahertz stealth
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| GB/T 7714 | Zhong, Yujie , Sun, Fuwei , Zhong, Shuncong et al. Hierarchical MoS2/Poly(ionic liquid) Metamaterials for Electrically Tunable Terahertz Stealth [J]. | ADVANCED MATERIALS , 2025 , 37 (37) . |
| MLA | Zhong, Yujie et al. "Hierarchical MoS2/Poly(ionic liquid) Metamaterials for Electrically Tunable Terahertz Stealth" . | ADVANCED MATERIALS 37 . 37 (2025) . |
| APA | Zhong, Yujie , Sun, Fuwei , Zhong, Shuncong , Huang, Yi , Lin, Jiewen , Zhang, Qiukun et al. Hierarchical MoS2/Poly(ionic liquid) Metamaterials for Electrically Tunable Terahertz Stealth . | ADVANCED MATERIALS , 2025 , 37 (37) . |
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为保证多维力传感器测量准确度,必须对该传感器进行静态标定,因此研究多维力传感器静态标定装置具有重要意义.首先,从多维力传感器静态标定需求出发,按工作原理将目前国内外主流使用的多维力传感器静态标定装置划分为静重式和叠加式这两类.然后,介绍了砝码式、杠杆式、自动式这三种静重式多维力传感器静态标定装置和液压式、龙门式、试验机式、移动平台式、电机式这五种叠加式多维力传感器静态标定装置的工作原理,对各种装置的国内外研究现状和存在不足分别进行了评述,并分析对比了各种装置的关键技术特点及优缺点.最后,从通用性、重复性、多维力模拟能力、成本效益等方面对多维力传感器静态标定装置进行了展望,指出了装置的设计和实施面临的挑战.该研究为后续多维力传感器静态标定装置的研创提供了参考.
Keyword ：
串接 串接 叠加式 叠加式 多维力传感器 多维力传感器 静态标定装置 静态标定装置 静重式 静重式
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| GB/T 7714 | 梁伟 , 谢智杰 , 黎兴强 et al. 多维力传感器静态标定装置的研究进展 [J]. | 自动化仪表 , 2024 , 45 (9) : 1-13 . |
| MLA | 梁伟 et al. "多维力传感器静态标定装置的研究进展" . | 自动化仪表 45 . 9 (2024) : 1-13 . |
| APA | 梁伟 , 谢智杰 , 黎兴强 , 张秋坤 , 徐震廷 , 顾立勋 et al. 多维力传感器静态标定装置的研究进展 . | 自动化仪表 , 2024 , 45 (9) , 1-13 . |
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A nonlinear chirp is always introduced to an interference fringe in the Fourier domain optical coherence tomography (FD-OCT), which can be regarded as an amplitude-modulated and frequency-modulated nonstationary signal. It is mainly caused by the non-uniform wavenumber sampling and the dispersion mismatch between the sample and the reference arms. It results in the broadening of the axial point spread function and the degradation of the axial resolution. In this paper, the parameterized instantaneous frequency estimation method (PIFEM) is applied to estimate the phase function of the chirped interference fringe to achieve the linear resampling of the wavenumber space and the rebalance of the dispersion mismatch. The proposed method is efficient and convenient that requires only two interference fringes corresponding to a mirror at different depths in the sample arm of the FD-OCT system. In addition, it is proved that the PIFEM is adapted to compensate for the depthindependent dispersion mismatch caused by the sample comprised of layered structures. The experiment results validate the performance of the proposed method.
Keyword ：
Dispersion compensation Dispersion compensation estimation estimation Optical coherence tomography Optical coherence tomography Parameterized instantaneous frequency Parameterized instantaneous frequency Wavenumber calibration Wavenumber calibration
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| GB/T 7714 | Huang, Yuexin , Deng, Yaosen , Lin, Jiewen et al. Wavenumber calibration and dispersion compensation for Fourier domain optical coherence tomography by parameterized instantaneous frequency estimation method [J]. | OPTICS AND LASER TECHNOLOGY , 2024 , 174 . |
| MLA | Huang, Yuexin et al. "Wavenumber calibration and dispersion compensation for Fourier domain optical coherence tomography by parameterized instantaneous frequency estimation method" . | OPTICS AND LASER TECHNOLOGY 174 (2024) . |
| APA | Huang, Yuexin , Deng, Yaosen , Lin, Jiewen , Zhang, Qiukun , Zhong, Shuncong . Wavenumber calibration and dispersion compensation for Fourier domain optical coherence tomography by parameterized instantaneous frequency estimation method . | OPTICS AND LASER TECHNOLOGY , 2024 , 174 . |
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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 1 mu m 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.
Keyword ：
birefringence birefringence group refractive index group refractive index spectral-domain interferometry spectral-domain interferometry
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| GB/T 7714 | Yangmei, Zhang , Qiukun, Zhang . Simultaneous measurement of thickness and group refractive index in birefringent crystals [J]. | MEASUREMENT SCIENCE AND TECHNOLOGY , 2024 , 35 (8) . |
| MLA | Yangmei, Zhang et al. "Simultaneous measurement of thickness and group refractive index in birefringent crystals" . | MEASUREMENT SCIENCE AND TECHNOLOGY 35 . 8 (2024) . |
| APA | Yangmei, Zhang , Qiukun, Zhang . Simultaneous measurement of thickness and group refractive index in birefringent crystals . | MEASUREMENT SCIENCE AND TECHNOLOGY , 2024 , 35 (8) . |
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Metamaterials based on quasi-bound states in the continuum (qBICs) with manipulable resonance quality (Q) factors have provided a standout platform for cutting-edge terahertz (THz) sensing applications. However, most so far have been implemented as conventional metal patch structures with adjacent substrate layers, incurring the limitation of insufficient light-matter interaction due to substrate effects. Here, qBIC-driven metamaterials with substrate-free metallic aperture structures for tailoring light-matter interactions and exhibiting near-ideal sensing performance is introduced. Specifically, it is incorporated ultrafast femtosecond laser processing technology to fabricate H-type metallic aperture metamaterials with accessible high-contrast Q factor resonances allowed by in-plane symmetry breaking. Correspondingly, stronger light field energies are applied to the interactions due to completely eliminating the confinement of the substrate effect, enabling experimental sensitivity of up to 0.86 THz RIU-1 for the qBIC resonance, 1.9 times that of the conventional dipole resonance. Moreover, a high Q qBIC resonance achieved by optimized asymmetry parameter is exploited for detecting ultrathin layers of L-proline molecules as low as 0.87 nmol. It is envisioned that this approach will deliver insights for real-time, precise, and high-performance detection of trace biomolecules, and open new perspectives for realizing ideal performance metadevices. A BIC-driven substrate-free terahertz metamaterial sensor is developed to completely overcome the limitation of insufficient light-matter interaction due to substrate effects. The experimental results report a sensing sensitivity up to 0.86 THz RIU-1 and exploit the tunable characteristic of the qBIC resonance to customize the structural configuration for different detection scenarios. image
Keyword ：
biosensors biosensors bound states in the continuum bound states in the continuum metamaterials metamaterials substrate-free substrate-free terahertz terahertz
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| GB/T 7714 | Lin, Tingling , Zeng, Qiuming , Huang, Yi et al. Substrate-Free Terahertz Metamaterial Sensors With Customizable Configuration and High Performance [J]. | ADVANCED OPTICAL MATERIALS , 2024 , 12 (29) . |
| MLA | Lin, Tingling et al. "Substrate-Free Terahertz Metamaterial Sensors With Customizable Configuration and High Performance" . | ADVANCED OPTICAL MATERIALS 12 . 29 (2024) . |
| APA | Lin, Tingling , Zeng, Qiuming , Huang, Yi , Zhong, Shuncong , Shi, Tingting , Zhong, Yujie et al. Substrate-Free Terahertz Metamaterial Sensors With Customizable Configuration and High Performance . | ADVANCED OPTICAL MATERIALS , 2024 , 12 (29) . |
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To accurately measure the surface roughness of precision parts, this paper proposes a non-destructive measurement method of surface roughness using frequency-domain interferometry as the core detection principle and the Hanning window energy center method as the signal demodulation method. The corresponding relationship between the height changes of the sample surface profile and the frequency density changes in the interference signal was established, and the Hanning window energy center method was used to accurately extract the periodic frequency, which can more accurately measure the surface roughness of the sample. After the spectrum correction method, the peak signal-to-noise ratio of the system reaches 50 similar to 60 dB. When the signal-tonoise ratio is 54.8, the theoretical measurement accuracy of the system reaches 5 nm. The vibration error generated during the actual measurement process is only 20 nm. The measurement results of the roughness measuring instrument were compared and analyzed. The experimental results showed that this system has higher measurement accuracy and accuracy, and the maximum repeatability error is 7 nm. To further verify the accuracy of the system, an atomic force microscope was used for comparison and verification. The difference between the two measurement results was 12 nm. This work provides a faster and more accurate non-destructive measurement method for surface roughness measurement.
Keyword ：
Frequency-domain interferometry Frequency-domain interferometry Hanning window energy center method Hanning window energy center method Surface roughness Surface roughness
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| GB/T 7714 | Zhang, Qiukun , Wang, Wenxuan , Zhong, Jialu et al. Nanoscale surface roughness measurement based on frequency-domain interferometry principle [J]. | OPTICS AND LASERS IN ENGINEERING , 2024 , 178 . |
| MLA | Zhang, Qiukun et al. "Nanoscale surface roughness measurement based on frequency-domain interferometry principle" . | OPTICS AND LASERS IN ENGINEERING 178 (2024) . |
| APA | Zhang, Qiukun , Wang, Wenxuan , Zhong, Jialu , Lin, Jiewen , Chen, Jinguo , Luo, Manting et al. Nanoscale surface roughness measurement based on frequency-domain interferometry principle . | OPTICS AND LASERS IN ENGINEERING , 2024 , 178 . |
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The flatness of semiconductor substrates is an important parameter for evaluating the surface quality of semiconductor substrates. However, existing technology cannot simultaneously achieve high measurement efficiency, large-range thickness measurement, and nanometer-level measurement accuracy in the thickness measurement of semiconductor substrates. To solve the problems, we propose to apply the method that combines spectral-domain optical coherence tomography (SD-OCT) with the Hanning-windowed energy centrobaric method (HnWECM) to measure the thickness of semiconductor substrates. The method can be employed in the full-chip thickness measurement of a sapphire substrate, which has a millimeter measuring range, nanometer-level precision, and a sampling rate that can reach up to 80 kHz. In this contribution, we measured the full-chip thickness map of a sapphire substrate by using this method and analyzed the machining characteristics. The measurement results of a high-precision mechanical thickness gauge, which is widely used for thickness measurement in the wafer fabrication process, were compared with the proposed method. The difference between these two methods is 0.373%, which explains the accuracy of the applied method to some extent. The results of 10 sets of repeatability experiments on 250 measurement points show that the maximum relative standard deviation (RSD) at this point is 0.0061%, and the maximum fluctuation is 71.0 nm. The above experimental results prove that this method can achieve the high-precision thickness measurement of the sapphire substrate and is of great significance for improving the surface quality detection level of semiconductor substrates.
Keyword ：
HnWECM HnWECM SD-OCT SD-OCT semiconductor substrate semiconductor substrate spectral-domain interferometry spectral-domain interferometry thickness measurement thickness measurement
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| GB/T 7714 | Zhong, Shuncong , He, Renyu , Deng, Yaosen et al. High-Precision Semiconductor Substrate Thickness Gauge Based on Spectral-Domain Interferometry [J]. | PHOTONICS , 2024 , 11 (5) . |
| MLA | Zhong, Shuncong et al. "High-Precision Semiconductor Substrate Thickness Gauge Based on Spectral-Domain Interferometry" . | PHOTONICS 11 . 5 (2024) . |
| APA | Zhong, Shuncong , He, Renyu , Deng, Yaosen , Lin, Jiewen , Zhang, Qiukun . High-Precision Semiconductor Substrate Thickness Gauge Based on Spectral-Domain Interferometry . | PHOTONICS , 2024 , 11 (5) . |
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