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19th IMEKO TC10 Conference on MACRO meets NANO in Measurement for Diagnostics, Optimization and Control

作者： Hiranaka, Yukio Tsujino, Koichi Katsumura, Hidenori Nakagawa, Masashi AiSpirits Inc. Tokyo Japan Hiranaka Technology Research Susono Japan Device & System Platform Development Center Co. Ltd. Kawasaki Japan

ISBN: (纸本)9781713884125

Human Experts may diagnose the state of a rotating machine by listening to its vibration sounds. Variational Auto-encoder (VAE) is an alternative method to realize the diagnosis by AI learning. Previous studies have shown that when the normal state can be assumed to be a single Gaussian distribution, anomaly scores can be calculated as deviations from the center of the distribution in the VAE latent space. However, when the normal state consists of different modes corresponding to operating conditions, the calculation may not be a simple task. As a way to solve this problem, the use of Conditional Variational Auto-encoder (CVAE) which performs VAE learning including operating conditions, seems promising. In this study, we show verification results that the anomaly score based on the normalized Euclidian distance in the CVAE latent space can detect anomalous conditions using synthesized data and real acceleration measurement data with rotation speed changes. © 2023 19th IMEKO TC10 Conference "MACRO meets NANO in Measurement for Diagnostics, Optimization and Control".

关键词： Bearing Anomaly Detection Condition Based Maintenance Conditional Variational Auto-encoder Industry Innovation Infrastructure

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development of a Rust Removal Tool Using a Diffractive Optical Element and High-power Laser and Its Application to Asbestos-melting Tools

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NTT Technical Review 2022年第10期20卷 77-81页

作者： Kawamura, Sohan Takayanagi, Kaori Smart Maintenance and Management Technology Development Project Health and Environmental-Sensing Device Project NTT Device Innovation Center Japan Sustainable System Group Zero Environmental Impact Research Project NTT Space Environment and Energy Laboratories Japan

To improve the efficiency of rust removal on telecommunication towers, we developed a prototype of a compact, lightweight rust-removal tool using a diffractive optical element and high-power laser that weighs only 500 g. With the aim of applying this technology to asbestos removal, we experimentally irradiated asbestos with a laser, and the results of the experiment suggest that using a laser in this manner can melt and remove asbestos and reduce its risk as a health hazard to workers. © 2022 Nippon Telegraph and Telephone Corp.. All rights reserved.

关键词： Asbestos

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High-power all-polarization-maintaining fiber femtosecond pulse laser at 780 nm and its engineering integration

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中国激光 2024年

作者：罗韬温俊鹏王文龙李梓晗朱喆杨家豪吴垠修昊范怡衡刘亚龙韦小明杨中民 School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and Devices Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Device Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology Guangzhou Yangming Laser Technology Co. Ltd Research Institute of Future Technology South China Normal University

We present a high-power, high-stability all-polarization-maintaining (all-PM)fiber femtosecond pulse laser source at 780 nm with full engineering integration that comprises an all-PM fiber amplified chirped pulse laser at 1560 nm, a grating pair compressorandasecond-harmonicgeneration(SHG)***-PMfiber amplified chirped pulse laser at 1560 nm operates with a repetition rate of 111.5 MHz and an average power of 5.37 W, which is compressed with a pulse width of～204 *** 780-nm pulses are subsequently generated by SHG in a frequency-doubling *** achieve an average power of 2.22 W at 780 nm with a pulse width of 288 fs, an SHG efficiency of 52%, and a root-mean-square power fluctuation of 0.23%, which is *** integrated for practical application with reliable laser operation. We anticipate that this780-nmall-PMfiberfemtosecondpulselaserwithfullengineeringintegrationis promising for frontier applications, like two-photon imaging, nanofabrication, terahertz generation, etc.

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Deterioration Score of Cold Forging Dies by Using Acoustic Emission Signals 18

Deterioration Score of Cold Forging Dies by Using Acoustic E...

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18th IMEKO TC10 Conference on Measurement for Diagnostic, Optimisation and Control to Support Sustainability and Resilience 2022

作者： Hiranaka, Yukio Tsujino, Koichi Katsumura, Hidenori Mori, Maho AiSpirits Inc. Tokyo Japan Hiranaka Technology Research Susono Japan Device & System Platform Development Center Co. Ltd. Kawasaki Japan Nichidai Corporation Ujitawara Japan

ISBN: (纸本)9781713870241

It is generally difficult to estimate the degree of deterioration of forging dies, but it is necessary to prevent a large number of defective products. In this study, we propose a deterioration score in cold lateral forging using acoustic emission (AE) signals. From the analysis of the measured data, the transition of the signal from the initial state to the deteriorated state can be observed, and the transition can be numerically evaluated. In the evaluation, variational auto-encoder (VAE) is used for learning the initial distribution, and the deterioration score is calculated by the degree of deviation from the learned distribution. The AE cumulative maximum amplitude and AE cumulative count during the linearly increasing stress period for each forging shot are given to the input of the VAE encoder, and valid deterioration scores are obtained for multiple actual measurements. © IMEKO TC10 Conference on Measurement for Diagnostic, Optimisation and Control to Support Sustainability and Resilience *** rights reserved

关键词： Deterioration

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High-Power All-Polarization-Maintaining Fiber Femtosecond Pulse Laser at 780 nm and Its Engineering Integration(Invited)

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中国激光 2024年第19期51卷 207-214页

作者： Luo Tao Wen Junpeng Wang Wenlong Li Zihan Zhu Zhe Yang Jiahao Wu Yin Xiu Hao Fan Yiheng Liu Yalong Wei Xiaoming Yang Zhongmin School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and DevicesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DeviceGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhou 510640GuangdongChina Guangzhou Yangming Laser Technology Co. Ltd.Guangzhou 510663GuangdongChina Research Institute of Future Technology South China Normal UniversityGuangzhou 510006GuangdongChina

We present a high-power, high-stability all-polarization-maintaining(all-PM) fiber femtosecond pulse laser source at 780 nm with full engineering integration that comprises an all-PM fiber amplified chirped pulse laser at 1560 nm, a grating pair compressor and a second-harmonic generation(SHG) module. The all-PM fiber amplified chirped pulse laser at 1560 nm operates with a repetition rate of 111.5 MHz and an average power of 5.37 W, which is compressed with a pulse width of about 204 fs. The 780-nm pulses are subsequently generated by SHG in a frequency-doubling crystal. We achieve an average power of 2.22 W at 780 nm with a pulse width of 288 fs, a SHG efficiency of 52%, and a root-mean-square power fluctuation of 0.23%, which is the best performance merit as far as we know. The whole laser system is finally integrated for practical applications with reliable laser operation. We anticipate that this 780-nm all-PM fiber femtosecond pulse laser with full engineering integration is promising for frontier applications such as two-photon imaging, nanofabrication, terahertz generation, etc.

关键词： lasers femtosecond pulse high power fiber laser second-harmonic generation

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A <100 PPB/K Frequency-Matching Temperature Stability MEMS Rate Integrating Gyroscope Enabled by Donut-Mass Structure 33

A <100 PPB/K Frequency-Matching Temperature Stability MEMS R...

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33rd IEEE International Conference on Micro Electro Mechanical systems, MEMS 2020

作者： Kaji, Shiori Gando, Ryunosuke Masunishi, Kei Ogawa, Etsuji Miyazaki, Fumito Hiraga, Hiroki Tomizawa, Yasushi Shibata, Hideki Corporate Research Development Center Toshiba Corporation Japan Device System Platform Development Center Co. Ltd. Japan

ISBN: (纸本)9781728135809

This paper experimentally demonstrates a donut-mass gyroscope (DMG) with the highest frequency-matching temperature stability reported to date for a MEMS rate integrating gyroscope (RIG). The DMG features a donut-like rigid mass suspended on a single central anchor. The XY resonant frequencies share the same temperature-dependent mechanical elements and hence inherit high relative stability. Using a prototype, an angular gain of 0.993 is confirmed, after electrostatic tuning of frequency mismatch to Delta f = 80 text{mHz}. Over the temperature range of 5-55 °C, Delta f and angular gain stay stable for © 2020 IEEE.

关键词： Gyroscopes

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Electrode materials for brain-machine interface:A review

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InfoMat 2021年第11期3卷 1174-1194页

作者： Nan Wu Shu Wan Shi Su Haizhou Huang Guangbin Dou Litao Sun SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationCollaborative Innovation Center for Micro/Nano FabricationDevice and SystemSoutheast UniversityNanjingChina Key Laboratory of Optoelectronic Technology and Systems Ministry of EducationKey Disciplines Laboratory of Novel Micro-Nano Devices and System TechnologySchool of Optoelectronics EngineeringChongqing UniversityChongqingChina Center for Advanced Materials and Manufacture Joint Research Institute of Southeast University and Monash UniversitySuzhouChina Center for Advanced Carbon Materials Southeast University and Jiangnan Graphene Research InstituteChangzhouChina

Brain-machine interface(BMI)is a device that translates neuronal information into commands,which is capable of controlling external software or hardware,such as a computer or robotic *** consequence,the electrodes with desirable electrical and mechanical properties for direct interacting between neural tissues and machines serves as the crucial and critical part of BMI ***,the development of material science provides many advanced electrodes for neural stimulating and ***,the widespread applications of nanotechnologies have innovatively introduced biocompatible electrode that can have similar characteristics with neural *** paper reviews the existing problems and discusses the latest development of electrode materials for BMI,including conducting polymers,silicon,carbon nanowires,graphene,and hybrid organic-inorganic *** addition,we will inspect at the technical and scientific challenges in the development of neural electrode for a broad application of BMI with focus on the biocompatibility,mechanical mismatch,and electrical performance of electrode materials.

关键词： biocompatibility brain-machine interface electrode materials implantable device

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Early detection and classification of bacterial colonies using a Thin-Film-Transistor (TFT)-based image sensor and deep learning

Early detection and classification of bacterial colonies usi...

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Frontiers in Optics, FiO 2022

作者： Li, Yuzhu Liu, Tairan Koydemir, Hatice Ceylan Wang, Hongda O'Riordan, Keelan Bai, Bijie Haga, Yuta Kobashi, Junji Tanaka, Hitoshi Tamaru, Takaya Yamaguchi, Kazunori Ozcan, Aydogan Electrical and Computer Engineering Department University of California Los AngelesCA90095 United States Bioengineering Department University of California Los Angeles90095 United States University of California Los AngelesCA90095 United States Department of Biomedical Engineering Texas A&M University College StationTX77843 United States Center for Remote Health Technologies and Systems Texas A&M University College StationTX77843 United States Department of Physics and Astronomy University of California Los AngelesCA90095 United States System Development Department Research & Development Division Japan Display Inc. Kanagawa243-0432 Japan Device Development Department Research & Development Division Japan Display Inc. Chiba297-8622 Japan R&D Planning Department Research & Development Division Japan Display Inc. Tokyo105-0003 Japan Department of Surgery University of California Los AngelesCA90095 United States

We report a rapid, automated, portable and high-throughput bacterial colony detection and classification system using a thin-film-transistor array and deep learning, achieving >12 hours of time savings compared to ...

ISBN: (纸本)9781557528209

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A <100 PPB/K Frequency-Matching Temperature Stability MEMS Rate Integrating Gyroscope Enabled by Donut-Mass Structure

A <100 PPB/K Frequency-Matching Temperature Stability MEMS R...

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IEEE International Conference on Micro Electro Mechanical systems

作者： Shiori Kaji Ryunosuke Gando Kei Masunishi Etsuji Ogawa Fumito Miyazaki Hiroki Hiraga Yasushi Tomizawa Hideki Shibata Corporate Research & Development Center Toshiba Corporation JAPAN Device & System Platform Development Center Co. Ltd. JAPAN

ISBN: (数字)9781728135816

ISBN: (纸本)9781728135823

This paper experimentally demonstrates a donut-mass gyroscope (DMG) with the highest frequency-matching temperature stability reported to date for a MEMS rate integrating gyroscope (RIG). The DMG features a donut-like rigid mass suspended on a single central anchor. The XY resonant frequencies share the same temperature-dependent mechanical elements and hence inherit high relative stability. Using a prototype, an angular gain of 0.993 is confirmed, after electrostatic tuning of frequency mismatch to △f = 80 mHz. Over the temperature range of 5-55 °C, △f and angular gain stay stable for

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A Compact Microcontroller-Based MEMS Rate Integrating Gyroscope Module with Automatic Asymmetry Calibration

A Compact Microcontroller-Based MEMS Rate Integrating Gyrosc...

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IEEE International Conference on Micro Electro Mechanical systems

作者： Ryunosuke Gando Daiki Ono Shiori Kaji Hiroshi Ota Tetsuro Itakura Yasushi Tomizawa Corporate Research & Development Center Toshiba Corporation Japan Device & System Platform Development Center Co. Ltd. Japan

ISBN: (数字)9781728135816

ISBN: (纸本)9781728135823

This paper presents the first microcontroller-based module-level MEMS rate integrating gyroscope (RIG) for direct angle measurement after automatic asymmetry calibration. The 5-cm prototype module integrates a vacuum-sealed donut-mass gyroscope device on analog and digital PCBs. In automatic calibration mode, the initial frequency and decay-time asymmetries are electrically tuned and reduced by >40 and >18 times, respectively. The sensing mode is enabled by built-in digital controls of vibration energy and frequency. Continuous angle measurement is confirmed with an angular random walk (ARW) of 0.6 deg/rt-h and a bias instability (BI) of 4.3 deg/h, proving comparable performances with previous FPGA-based large RIG systems. This module paves the way for RIG commercialization studies.

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