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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Fu, Mingkai Wang, Shaohong Ma, Chao Key Laboratory of Modern Measurement and Control Technology Ministry of Edu. Beijing Information Science and Technology Beijing China Beijing Key Lab of Measurement and Control of Mechanical and Electrical System Beijing Information Science and Technology Beijing China

ISBN: (纸本)9781837242672

In order to achieve accurate segmentation of gait phases for precise real-time control of lower limb exoskeleton robots, the periodic statistical analysis of human motion posture by using the inertial measurement unit is conducted. In current research, the data of forward and turning gait types were acquired and every gait type data were devised into eight for different gait phase segmentation. During the process, the phase division values for different types of subjects were calculated and the phase division of different subjects with the same gait type was calculated. The standard deviations for different gaits and phases for the same experimenter are all below 10, primarily oscillated around 4. For gait data from different subjects, the percentages at the same phase are all below 3. The results showed that the results from the feasible method could better accord with the characteristics of each stage of actual *** those results could provide reference for real-time judgment of gait phase and technical support for intelligent control of lower limb exoskeletons. © The Institution of Engineering & technology 2024.

关键词： Exoskeleton (Robotics)

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LOWER LIMB GAIT RECOGNITION METHOD BASED ON KNOWLEDGE DISTILLATION 10

LOWER LIMB GAIT RECOGNITION METHOD BASED ON KNOWLEDGE DISTIL...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Wang, Mengdi Wang, Shaohong Ma, Chao Key Laboratory of Modern Measurement and Control Technology Ministry of Edu. Beijing Information Science and Technology Beijing China Beijing Key Lab of Measurement and Control of Mechanical and Electrical System Beijing Information Science and Technology Beijing China

ISBN: (纸本)9781837242672

The need for assistive devices such as lower limb exoskeletons is steadily growing, making quick and precise gait recognition essential for optimal operation of these apparatuses. The knowledge distillation method was applied to gait recognition in this work. First, we took participant lower limb gait data, which we then resampled with step frequency taken into account. Next, multi-layer perceptron (MLP) with distinct layers were modeled by educators and students. The process of knowledge distillation was used to improve the accuracy of participant activity recognition by transferring knowledge from the sophisticated teacher model to the lightweight student model. On the training set, the teacher model's accuracy average was 96.4%. Following the process of knowledge distillation, the accuracy of the student model was 95.48%, representing a 1.12% improvement compared to the non-distilled model, with only 0.53M parameters and shorter training duration. The results demonstrate that knowledge distillation can improve the recognition speed and stability of gait recognition models, enabling more accurate and reliable results within the same patient population, thus providing more effective support for medical diagnosis and rehabilitation treatment. © The Institution of Engineering & technology 2024.

关键词： Exoskeleton (Robotics)

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INVESTIGATION OF AUTONOMOUS GROUND CURRENT FIELD INJECTION SIGNAL CHARACTERISTICS 10

INVESTIGATION OF AUTONOMOUS GROUND CURRENT FIELD INJECTION S...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Wang, Yanke Su, Zhong Chu, Sirui Ling, Zhongao Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Autonomous injection of signals to generate ground current field technology is used to realize signal transmission by injecting signals into the ground to form a ground current field. In this paper, horizontal double electrodes are used to inject the signal into the ground, and the model of the ground equivalent electrical network is established according to the circuit characteristics, and the signal transmission characteristics are simulated and analyzed. In order to verify the penetration ability of different signals, square wave, sine wave and triangle wave are injected into the ground, and the signals are received at 13m and 18m and processed and analyzed. The results show that the square wave has the best penetration, followed by the sine wave and finally the triangle wave, which is consistent with the simulation results and verifies the accuracy of the model and the signal penetration ability in the medium. © The Institution of Engineering & technology 2024.

关键词： Equivalent circuits

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Thickness measurement of Single-Mode Fiber Coating Layer Based on Forward Brillouin Scattering

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IEEE Sensors Journal 2025年第11期25卷 19332-19340页

作者： Zhang, Yongqi Wang, Tao Liu, Yijia Liu, Li Zhang, Mingjiang Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education College of Physics and Optoelectronic Engineering Taiyuan030024 China Taiyuan University of Technology Shanxi Key Laboratory of Precision Measurement Physics The College of Physics and Optoelectronic Engineering Taiyuan030024 China

The coating layer is essential for protecting and applying optical fibers. Nowadays, the thickness measurement of the coating layer relies on point measurement schemes, such as the side-looking light distribution method and mechanical method. However, there are some problems with the above methods, such as the tradeoff between resolution and field of view (FOV), the cutting of the measurement position, and the long measurement time. To overcome these problems, we propose a new method based on forward Brillouin scattering (FBS), which measures the coating layer thickness of single mode fibers (SMFs). The physical properties of the transverse acoustic field involved in FBS make it possible to measure the thickness of the fiber coating. The corresponding relationship between the transverse acoustic mode frequency and the diameter of the coating layer can be calculated. The coating layer thickness can be measured with high precision by measuring the frequency spectrum of FBS corresponding to multiple transverse acoustic modes at a given temperature. In the verification experiment, three types of SMF coated with polyimide are used as the sensing fiber to measure the thickness of the coating layer at multiple temperatures. The experimental results show that the error in the coating layer thickness obtained is less than 0.05 μm. To the best of our knowledge, this is the first demonstration of nondestructive, high-precision monitoring of fiber coating thickness. © 2025 IEEE.

关键词： Acoustic field measurement

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RSSI-BASED INJECTED GROUND CURRENT FIELD LOCALIZATION STUDY 10

RSSI-BASED INJECTED GROUND CURRENT FIELD LOCALIZATION STUDY

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Chu, Sirui Su, Zhong Wang, Yanke Ling, Zhongao Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Aiming at the problem that traditional positioning techniques are easily limited in complex environments, this study proposes a positioning method based on Received Signal Strength Indication (RSSI) of injected ground current field, which is suitable for closed or sheltered environments, such as underground alleyways, and also works effectively under extreme conditions, such as alleyways collapsing. Firstly, the validity of the ground current field signals is tested to ensure that the signals are reliable;secondly, the extracted signals are screened to remove signals with low signal-to-noise ratios and high ground resistance, and to reduce the influence of environmental noise on the localization results;next, the RF parameter A as well as the signal transmission constant n are computed using the linear regression least square method, which provide important fitting parameters for the subsequent establishment of the RSSI localization model;finally, a Gaussian filtering to process the RSSI data collected by modelling. The experimental results show that the method achieves the positioning of underground alleyways environment with good feasibility and effectiveness, and provides a feasible solution for carrying out efficient alleyway personnel positioning and rescue operations, which has important theoretical significance and practical value. © The Institution of Engineering & technology 2024.

关键词： Linear regression

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A STUDY OF CAPICITANCE CHARACTERS OF METAL MICRO-HEMISPHERICAL RESONANT GYRO DETECTION 10

A STUDY OF CAPICITANCE CHARACTERS OF METAL MICRO-HEMISPHERIC...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Yao, Xiangxian Su, Zhong Gu, Xibing Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Compared with the traditional quartz hemispherical resonant gyro, the metal micro hemispherical resonant gyro has a stronger high overload capacity and can adapt to more extreme environments, and its capacitance characteristics directly determine the performance of the metal micro hemispherical resonant gyro. In this paper, an oscillator with a diameter of 12 mm is selected, and the capacitance characteristics of the metal micro hemispherical resonant gyro are studied in detail from the two influencing factors of the number of oscillator teeth and capacitance spacing. The finite element simulation of the oscillator has been carried out using finite element software and the capacitive characteristics have been simulated and analyzed. The results show that when the number of teeth of the oscillator is 16 teeth and the capacitance spacing is 0.05 mm, the excited area is enhanced by 460% and the capacitance value increases to 10 pF. This study provides an important theoretical basis for the capacitance design of the resonant gyro with a metal micro hemisphere. © The Institution of Engineering & technology 2024.

关键词： Gyroscopes

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A STUDY OF THE CHARACTERISTICS OF THE INFLUENCE OF THE PRECESSION FACTOR OF AN ALL-METAL MICRO-HEMISPHERICAL RESONATOR 10

A STUDY OF THE CHARACTERISTICS OF THE INFLUENCE OF THE PRECE...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Gu, Xibing Su, Zhong Yao, Xiangxian Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

The precession factor of resonant gyro is the key performance index of gyro sensitive angular velocity, and the main factors affecting the precession factor are the structural parameters of the resonator. In this paper, an all-metal micro-hemispherical resonator with a radius of 3mm is taken as the research object, the expression of the precession factor of the hemispherical resonator is established, and the intrinsic frequencies under different modal orders are obtained through the finite element simulation experimental method, and the influences of the radius of the hemispherical shell, the thickness of the shell, the diameter of the central axis rod, and the radius of the inner fillet angle on the precession factor of the resonator are analyzed. The experimental results show that the size of the inner fillet radius has a significant effect on the precession factor, and the precession factor of the metallic micro-hemispherical resonator is mainly maintained at 0.2980 with a variation range of less than 1%. This study provides reference data for the optimization of the structural parameters of the all-metal micro-hemispherical resonator. © The Institution of Engineering & technology 2024.

关键词： Gyroscopes

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Spectral broadening of femtosecond lasers based on the interaction of multiple broadening methods under dispersion equilibrium 15

Spectral broadening of femtosecond lasers based on the inter...

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Advanced Lasers, High-Power Lasers, and Applications XV 2024

作者： Zhang, Xiang Chen, Li Zhang, Zhiyong Qin, Yin Zhao, Yue Chen, Guangwei Zhou, Zhehai Key Laboratory of Modern Optoelectronic Measurement Technology in Mechanical Industry Beijing Information Science and Technology University Beijing China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instruments Beijing Information Science and Technology University Beijing China

ISBN: (纸本)9781510681927

Broadband lasers have extensive applications in many fields such as spectroscopy, photochemistry, medicine, and biology, so they have obtained significant attention, particularly for their enormous potential in broadband imaging, pollution monitoring, and semiconductor material processing. This paper presents a 1-micron femtosecond laser with a broadened spectrum, achieved by integrating both intracavity and extracavity spectral broadening methods. Initially, a 1-micron single-mode fiber is introduced into the laser cavity to reduce the total dispersion. Subsequently, the collimated output laser is directed onto a negative dispersion grating. After being reflected by the dual grating system, the laser is measured, all while maintaining a stable mode-locked state. To address spectral distortion caused by the loss in non-target gain intervals, dual filtering is employed to retain only the 1064 nm gain interval. Through the balance between these two negative dispersions, the laser’s spectral width is expanded by approximately six times from its original 5 nm to 30 nm. During the experiments, the laser demonstrated remarkable stability and compared to using only intracavity single-mode fiber expansion or extracavity grating expansion, this approach offers superior results and greater potential. It aids in the precise measurement of pollutants and plays a crucial role in enhancing the resolution of broadband imaging. © 2024 SPIE.

关键词： Single mode fibers

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STUDY ON THE measurement METHOD OF GROUND CONDUCTIVITY OF INJECTED GROUND CURRENT FIELD 10

STUDY ON THE MEASUREMENT METHOD OF GROUND CONDUCTIVITY OF IN...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Ling, Zhongao Su, Zhong Zhao, Hui Wang, Yanke Cu, Sirui Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

The injected ground field technology is crucial for personnel localization and communication in complex geological environments, and accurate acquisition of ground conductivity information is a matter of communication quality and positioning accuracy. Aiming at the limitations of the traditional four-terminal electrode method of laying electrodes, this paper proposes a ground conductivity measurement method with non-linearly laid electrodes. The feasibility of the method was verified and analyzed in a numerical simulation environment. The results show that the method has good feasibility and accuracy, but attention should be paid to the effect of electrode asymmetry on the measurement results in the case of close distance between the detection electrode and the injection electrode. In the field measurement experiments, the standard deviation of the measured data of this method is less than 0.55 us/mm, and the maximum relative error is not more than 8.82%, which is able to meet the needs of the actual project, and provides a feasible solution for the measurement of conductivity under the complex geological environments, especially when the application of the traditional four-terminal electrode method is limited. © The Institution of Engineering & technology 2024.

关键词： FINITE ELEMENT NUMERICAL SIMULATION FOUR-TERMINAL ELECTRODE METHOD GROUND CONDUCTIVITY GROUND CURRENT FIELD NONLINEAR ELECTRODE PLACEMENT

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EQUIVALENT CONDUCTIVITY measurement METHODS FOR MIXED NON-HOMOGENEOUS MEDIA 10

EQUIVALENT CONDUCTIVITY MEASUREMENT METHODS FOR MIXED NON-HO...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Sun, Zhenzhen Su, Zhong Li, Fei Zhang, Zhicheng Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Aiming at the problems of complicated electrode deployment and uncertain measurement range under a non-uniform medium in the "current-voltage" four-terminal method of conductivity measurement, a two-electrode equivalent conductivity measurement method based on the ground current field transport model is proposed. The "air-ground" layered medium ground current field transmission model is constructed, the equivalent conductivity model is further derived, the model error is corrected, and the simulation results show that the measurement accuracy of the uniform medium reaches 99%;the measurement results of the mixed non-uniform medium are in line with the theory;the dielectric conductivity increases firstly with the increase of the medium volume and then tends to be stable, and the measurement range of conductivity can be roughly determined accordingly. Under the two dry clay and soil environments, the measurement results are consistent with the soil EC value detector, which meets the application requirements. © The Institution of Engineering & technology 2024.

关键词： Electric conductivity measurement

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