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16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Zhang, Jinxu Shi, Liheng Gu, Yingying Zhang, Donglai Yin, Lu Wu, Guanhao Tsinghua University State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Beijing100084 China Beijing Institute of Control Engineering Space Optoelectronic Measurement and Perception Lab. Beijing100190 China China Academy of Space Technology National Key Laboratory of Space Intelligent Control Beijing100094 China

We present a one-shot 3D spectral interferometry technique using a digital micromirror device. By encoding the distribution of the spatial light field, this approach enables 3D imaging of step structures within 27 ms.... 详细信息

ISBN: (纸本)9798350372076

关键词： Interferometry

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Investigation on the Direct Current Coefficient of I/V Transducer 16

Investigation on the Direct Current Coefficient of I/V Trans...

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16th IEEE International Conference on Electronic measurement and Instruments, ICEMI 2023

作者： Zhou, Liren Zhu, Li Geng, Ji Shanghai Institute of Measurement and Testing Technolog Shanghai Key Laboratory of On-line Testing and Control Technology Shanghai China

ISBN: (纸本)9798350327144

Direct current coefficient is an essential parameter of I/V transducer, which directly affects the measurement results. Traditional method, comparing the measured transducer with the standard transducer, has limitations;failure to solve the problem in essence. To measure the direct current coefficient accurately, a measuring device was developed, which consists of direct current source, standard direct current ratio, adjustable standard direct current ratio, standard I/V transducer, voltage meter and null indicator. A measurement method was proposed, which fixes the value of direct current source and current flowing through the standard I/V transducer;adjusts the current through the high accuracy ratio conversion. The error measurement principle was employed to minimize the influence on the measurement results. Measure the current coefficient of an I/V transducer and restore its actual working state. The result shows that the current coefficients in the four current ranges are all negative, and are basically in the order of 10-5. The proposed method is characterized by breaking dependence on the superior standard device and meets the needs of precise measurement result correction. © 2023 IEEE.

关键词： Transducers

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Terahertz time-of-flight tomography algorithm for different curvature samples

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Optics Express 2025年第7期33卷 15095-15109页

作者： Zhou, Yu Li, Quanyong Cui, Zongyu Zhang, Jiyang Ren, Jiaojiao Zhang, Dandan Gu, Jian Li, Haoxiang Lin, Zihao Key Laboratory of Optoelectronic Measurement and Control and Optical Information Transmission Technology Ministry of Education Changchun University of Science and Technology Changchun130022 China School of Optoelectronic Engineering Changchun University of Science and Technology Changchun130022 China Zhongshan Research Institute Changchun University of Science and Technology Zhongshan528403 China

Traditional guide rail-based terahertz reflection tomography works well with planar samples and complements transmission tomography. Most imaging methods perform effectively with plane-like or simple curvature samples. However, these methods are ineffective for complex shapes due to the challenges of dealing with internal corrections and stitching errors. To address the above issues, terahertz time-of-flight tomography is applied to the prepared samples with abnormal curvature using a rotating scanning array and "point cloud splicing" method. This approach enables comprehensive sample information collection and resolves the inner layer point cloud position correction challenge. A radial distance point cloud down-sampling method is proposed to reduce the impact of overlapping point clouds on reconstruction accuracy. After down-sampling, the outer layer reconstruction error reduces to 0.22%. Poisson surface reconstruction further enhances the intuitiveness of imaging results, and the reconstruction accuracy is 0.01 mm. This study broadens the application of terahertz time-of-flight tomography and offers a different approach for reflection tomography. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Surface reconstruction

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Influence of Mountain Topography on Receiver Layout in Transient Electromagnetic Method 5

Influence of Mountain Topography on Receiver Layout in Trans...

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5th International Conference on Intelligent control, measurement and Signal Processing, ICMSP 2023

作者： Yuan, Zhechen Dai, Lei Oil and Gas Wells xi'An Shiyou University Shanxi Key Laboratory of Measurement and Control Technology Xi'an China

ISBN: (纸本)9798350336030

Due to the great difficulty that mountainous terrain poses for resource exploration, the undulating terrain outside the emission source has an impact on the electromagnetic response. Further research is still needed for relevant issues. In this paper, a three-dimensional terrain-constrained airborne transient electromagnetic forward simulation is implemented based on the finite element method. Mountainous terrain is arranged outside the emission source, and the distance between the mountainous terrain and the emission source is quantitatively analyzed, and the error distribution caused by terrain at different receiving points is given. The impact of mountainous terrain on the electromagnetic response characteristics is analyzed, which provides a theoretical basis for the layout of receiving sources in airborne transient electromagnetic exploration. © 2023 IEEE.

关键词： Landforms

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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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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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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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ICEEMDAN and LSTM Spindle System Fault Diagnosis Method

ICEEMDAN and LSTM Spindle System Fault Diagnosis Method

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UNIfied Conference of International Workshop on Defence Applications of Multi-Agent Systems, DAMAS 2023, International Conference on Maintenance Engineering, IncoME-V 2023, International conference on the Efficiency and Performance Engineering Network, TEPEN 2023

作者： Wang, Nan Wang, Hongjun Zhang, Zhuangzhuang Chen, Baisheng School of Mechanic and Electric Engineering BISTU Beijing100192 China Key Laboratory of Modern Measurement and Control Technology BISTU Beijing100192 China

ISBN: (纸本)9783031494123

Research on fault diagnosis of rotating machinery is crucial as it serves as a core component. In order to diagnose spindle system fault types quickly and accurately, Improved Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (ICEEMDAN) and Long Short-Term Memory (LSTM) fault diagnosis method is presented. Firstly, collect the fault vibration, then ICEEMDAN is used for vibration signals to extract seven times domain features and four frequency domain features. Finally, the time domain and frequency domain features’ parameters are input into the LSTM network for fault classification. The method is verified for the practical industrial CNC machine center spindle system. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Empirical mode decomposition

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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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Study on the Monitoring and Analysis Method of the Working Efficiency of Torsional Impactors 29th

Study on the Monitoring and Analysis Method of the Working E...

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29th International Conference on Computational and Experimental Engineering and Sciences, ICCES 2023

作者： Zhang, Tao Liu, Daixuan Xie, Xue Li, Yumei Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100101 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100101 China

ISBN: (纸本)9783031425141

The torsional impactor converts the kinetic energy of the drilling fluid into fixed-frequency mechanical circumferential vibration, which can effectively suppress the drilling stick–slip phenomenon and increase the mechanical drilling speed. However, due to various factors such as its performance, formation lithology, and construction parameters such as weight of bit and displacement, it is not possible to effectively monitor and evaluate the working condition and performance of the torsional impactor in the well by relying on surface observation data. In this paper, the torsional impactor is connected to a near-bit measurement tool to form a torsional impactor monitoring system. By experimentally measuring the vibration, rotational speed, bit weight, and torque data of the torsional impactor during operation, the data features are extracted by combining the time domain and frequency domain analysis methods to monitor the operating impact frequency of the torsional impactor and analyze the influence of different drilling parameters on the working efficiency of the torsional impactor. The analysis results show that this study can achieve the monitoring of the working status and working efficiency of the downhole speed lifting tool, which is beneficial to the optimization design of the speed lifting tool and the improvement of the working efficiency. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Condition monitoring

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