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- 摘要
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- 实验方案
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[IEEE 2019 International Conference on Electrical Engineering and Informatics (ICEEI) - Bandung, Indonesia (2019.7.9-2019.7.10)] 2019 International Conference on Electrical Engineering and Informatics (ICEEI) - Determination of Maximum Grid-Connected Photovoltaic Penetration Level Based on Unit Commitment Solution
摘要： This paper demonstrates the use of low-cost off-the-shelf (OTS) microelectromechanical system (MEMS) technology to perform vibration-based in situ monitoring, diagnostics, and characterization of a MEMS microball bearing supported radial air turbine platform. A multimodal software suite for platform automation and sensor monitoring is demonstrated using a three-level heuristic software suite and sensor network. The vibration diagnostic methods used in the platform have applications in rotary microsystems for the early detection of failure, fault diagnosis, and integrated diagnostic systems for feedback-based optimization to increase device performance, reliability, and operational lifetimes. The studied rotary microdevice used a dual OTS accelerometer configuration for dual range parallel redundant vibration analysis. The sensor suite has been used to monitor and detect multiple operational parameters measured optimally in time or frequency domains such as rotor instability, imbalance, wobble, and system resonance. This paper will lay the framework for active diagnostics in future MEMS devices through integrated systems.
关键词： rotating machine stability,Non-destructive,rotating machine measurement,vibration measurement
更新于2025-09-19 17:13:59
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Vibration Measurement Based on the Local Maximum Detection Algorithm for Laser Self-Mixing Interferometry
摘要： A novel laser self-mixing interferometry vibration measurement algorithm based on the local maximum detection technique is proposed, that can reconstruct micro vibrations rapidly and easily. In this article, the principles of the local maximum detection algorithm are analyzed in detail, and the process of solving the window function is emphasized. The major advantage of the method is that it does not involve any complicated calculations and removes the need for optical/electromechanical components. The validity of the presented method is confirmed by means of simulated signals and demonstrated via several experiments for harmonic and aleatory motion.
关键词： local maximum detection,self-mixing interferometry,vibration measurement
更新于2025-09-19 17:13:59
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Interface Engineering by Employing Zeolitic Imidazolate Framework-8 (ZIF-8) as the only Scaffold in the Architecture of Perovskite Solar Cells
摘要： In this study, we employed Zeolitic Imidazolate Framework-8 (ZIF-8) at the interlayer between the compact TiO2 and perovskite layers. As a result, enhanced perovskite crystallinity and grain sizes, and considerably improved photovoltaic performance of perovskite solar cell (PSC) were achieved. It was demonstrated that the ZIF-8 film includes all characteristics suitable for being applied as scaffold in the PSCs with the advantage of easier synthesis approach in room temperature in comparison to the mesoporous TiO2 counterpart. Moreover, we replaced the thermal annealing process commonly applied on the perovskite layers with room temperature ultrasonic vibration post treatment of wet perovskite films.
关键词： zeolitic imidazolate framework,Perovskite solar cells,room temperature,ultrasonic vibration post treatment,grain size
更新于2025-09-19 17:13:59
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Optical Fiber Vibration Sensor Using Least Mean Square Error Algorithm
摘要： In order to enhance the signal-to-noise ratio (SNR) of a distributed optical fiber vibration sensor based on coherent optical time domain reflectometry (COTDR), a high extinction ratio cascade structure of an acousto-optic modulator and semiconductor optical amplifier is applied. The prior time-frequency analysis and least mean square error algorithm are adopted in the COTDR system for amplitude demodulation and phase demodulation, in order to improve the SNR by noise elimination. The experimental results show that the adaptive filter based on the least mean square error algorithm could realize the extraction of a three-order sinusoidal harmonic signal from strong background noise along the optical fiber and the SNR improvement from 10.4 dB to 42.2 dB. The proposed demodulation algorithm is suitable for the detection of vibration signals with characteristic frequencies in the application of acoustic fault diagnosis for electromechanical devices.
关键词： least mean square error algorithm,optical fiber vibration sensor,semiconductor optical amplifier,coherent optical time domain reflectometry
更新于2025-09-19 17:13:59
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A laser triangulation sensor for vibrational structural analysis and diagnostics
摘要： The industrial progress has reached a level in which it is necessary to understand the behavior of mechanical components and to monitor their conditions without disassembling them. Nowadays, a suitable methodology is based on vibrational analysis usually performed through acceleration signals measured directly on the system to be tested. However, in the last years, the industrial scenario has deeply changed due to the need for time reduction, in particular, for the control operations at the end of the productive line. The genuine methods based on acceleration measurements, for example, through piezoelectric accelerometers, came into conflict with the industrial need as the sensors used for the quality control have to be easily and fastly mounted and unmounted. A valid alternative is represented by the exploitation of laser triangulation sensors that are able to measure the dynamic displacement in a contactless way, strongly reducing the (un)mounting time. The target of this paper is to highlight pros and cons of the contactless displacement analysis through laser triangulation sensors with respect to the contact one through genuine accelerometers by means of a comparison between the results obtained both for experimental modal analysis and vibrational diagnostics of rotating machines.
关键词： displacement analysis,experimental modal analysis,laser triangulation sensor,Vibration,vibrational diagnostics
更新于2025-09-19 17:13:59
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Distribution Acoustic sensor based flow measurement using flow-induced vibrations
摘要： In this paper, we demonstrated a non-invasive flowmeter based on optical fiber distribution acoustic sensor (DAS) system, in which the flow rate is measured by detecting Flow-Induced Vibrations(FIV) noise. The experiment results showed that the flow rate has a quadratic relationship with the standard deviation(SD) of the noise signal caused by the FIV.
关键词： Flowmeter,Vibration analysis,DAS,FIV
更新于2025-09-16 10:30:52
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Coupled Dynamic Analysis and Decoupling Optimization Method of the Laser Gyro Inertial Measurement Unit
摘要： The mechanical dithered ring laser gyro (RLG) effectively overcomes the lock‐in effect and ensures the sensitive accuracy of the low angular rate for the gyro. However, in the inertial measurement unit (IMU) system, the dither excitation of three RLGs causes the coupled vibration of the IMU structure, which could seriously limit the measuring accuracy of RLGs. In this paper, the vibration frequency response characteristic of laser gyro IMU is taken as the focus point, and the method of multi‐rigid body dynamics is used to establish the dynamic model of IMU suitable for vibration frequency response analysis. On the basis of the model, the multi‐degree‐of‐freedom coupling vibration of IMU with the gyro dither excitation is clearly described. A new IMU dynamic decoupling optimization method is proposed to minimize the coupled vibration frequency response, and compared with the previous optimal design method. The prototype experimental test results show that the coupled vibration of IMU is restrained more effectively by the proposed new method than by the previous optimal design method. Finally, on the basis of this new method, the measuring accuracy of the RLGs in the IMU system is improved, which is quite useful for practical engineering application.
关键词： inertial measurement unit (IMU),multi‐rigid body dynamics,ring laser gyro (RLG),coupled vibration,mechanical dither
更新于2025-09-16 10:30:52
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[IEEE IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Lisbon, Portugal (2019.10.14-2019.10.17)] IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Study of Vibration Sensing Technique Using Fabry-Pérot Interferometer with Optical Fibers
摘要： The measurement results of the vibration using optical fibers are presented. We detected the vibration of the measurement object by measuring reflected light using the optical fibers. A Fabry-Pérot interferometer in which an optical fiber and a metal mirror are opposed was configured as a displacement sensor. When vibration was imparted to the mirror, the fluctuation of the reflected power due to the increase and decrease of an air gap depending on the driving of the mirror could be measured. The optimum size of the gap between the optical fiber and the metal mirror was also investigated. In this report, it is stated that the Fabry-Pérot interferometer with optical fibers can be used as a displacement sensor for minute vibrations.
关键词： vibration sensing,Fabry-Pérot interferometer,optical fiber
更新于2025-09-16 10:30:52
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Speckle reduction by employing two green lasers and two-dimensional vibration of lenses
摘要： A method of speckle reduction suitable for use in a laser projector was proposed in the paper. Speckle contrast ratio (SCR) reduction was achieved by combining wavelength diversity and angular diversity methods. First, wavelength diversity was demonstrated by the use of two green laser sources (a 520 nm laser diode (LD) and a 532 nm diode-pumped solid-state (DPSS) laser) at a power ratio of 4:1. Second, angular diversity was achieved via the vibration of two lenses in two orthogonal directions placed directly after the laser source. The vibrating lenses are small and do not require changes to the beam path of the laser source, allowing for more compact projector designs. The frequency of vibration of these lenses was optimized to minimize the SCR in the output image. A SCR of less than 4% was achieved without the use of optical diffusers, which significantly reduces optical losses. Optical transmission could be further increased with the optimization of optical coatings on the lenses. This result shows great promise for applications such as laser pico-projectors within the realm of heads-up displays (HUDs) and mobile devices.
关键词： two-dimensional vibration of lenses,speckle reduction,mini-/pico-projectors
更新于2025-09-16 10:30:52
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An On-Orbit Dynamic Calibration Method for an MHD Micro-Angular Vibration Sensor Using a Laser Interferometer
摘要： The magnetohydrodynamic (MHD) micro-angular vibration sensor is a signi?cant component of the MHD Inertial Reference Unit (MIRU) and measures micro-amplitude and wide frequency angular vibration. The MHD micro-angular vibration sensor must be calibrated in orbit since the ground calibration parameters may change after lift-off. An on-orbit dynamic calibration method for the MHD micro-angular vibration sensor is proposed to calibrate the complex sensitivity of the sensor in high frequency. An absolute calibration method that combines a homodyne laser interferometer and an angular retrore?ector was developed. The sinusoidal approximation method was applied, and the calibration system was established and tested using a manufactured MHD sensor. Furthermore, the measurement principle and installation errors were analyzed, including the eccentric installation error of the retrore?ector, the tilt installation error of the retrore?ector, and the optical path tilt error. This method can be realized within a rotation range of ±3? and effectively avoid the installation error caused by mechanical errors. The results indicate that the calibratable angular vibration frequency range is 25–800 Hz, and the angular velocity range is 0.076–7590 mrad/s. The expanded uncertainties of the sensitivity amplitude and phase shift of the calibration system for the MHD micro-angular sensor are 0.04% and 1.2? (k = 2).
关键词： micro-angular vibration sensor,laser interferometer,on-orbit dynamic calibration,MHD,installation error,sensitivity
更新于2025-09-16 10:30:52