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Three-dimensional translation vibration measurement system based on linear array sensor and composite fringe pattern

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MEASUREMENT SCIENCE AND TECHNOLOGY 2022年第9期33卷 095901-095901页

作者： Zhong, Jianfeng Liu, Dongming Wu, Shengyuan Li, Siyu Zhong, Shuncong Liang, Wei Fuzhou Univ Sch Mech Engn & Automat Lab Opt Terahertz & Nondestruct Testing Fuzhou 350116 Peoples R China

The vibration signal of a structure gives crucial information to understand its condition. A novel three-dimensional (3D) vibration measurement system is proposed, based on a linear array sensor (LAS) and a composite fringe pattern (CFP), for monitoring a rigid structure with translation displacement along each direction. The CFP is composed of three sinusoidal fringe sets. Two parallel sinusoidal fringe sets on both sides of the CFP and an inclined one in the middle. The displacement along the imaging optical axis could be obtained from the center distance variation of the parallel fringe sets in the recorded CFP. Meanwhile, the vertical displacement could be acquired from the variation of the center distance ratio of the fringe sets. The horizontal displacement could be obtained by locating the symmetric center of the parallel fringe intensity. A peak locating algorithm was created to realize sub-pixel displacement measurement without an increase in the amount of computation. Simulation results verify the feasibility, effectiveness and robustness of the proposed algorithms. The measurement performance of the proposed system was also verified by comparison experiments, whose results demonstrated that the proposed system is capable of recovering structural 3D displacements. Therefore, the proposed vibration monitoring system could be recommended for real engineering applications in the 3D translation vibration monitoring of rigid structures.

关键词： linear array sensor 3D vibration measurement composite fringe pattern

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Theoretical and experimental study of self-reference intensity-modulated plastic fibre optic linear array displacement sensor

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sensorS AND ACTUATORS A-PHYSICAL 2015年 222卷 67-79页

作者： Yang, Chen Oyadiji, S. Olutunde Univ Manchester Sch Mech Aerosp & Civil Engn Manchester M13 9PL Lancs England

A self-reference intensity-modulated plastic fibre optic displacement sensor of linear array configuration is presented in this paper. It consists of receivers categorised into two reference groups. The effect of the number of receivers in each reference group on the group and displacement ratio responses is investigated. Theoretical analysis, based on Gaussian beam model for multiple receivers at different offset distances, is presented. Simulation results that are based on the derived model are employed to study the ratio function for different reference groups. The predicted sensor performance, in terms of linear range and sensitivity, is verified by experiment. There is a very good agreement between the predicted and measured characteristics. The effects of the number of receivers in each reference group on linear operation range and sensitivity are compared and discussed. Both theoretical and experimental results show that the optimal linear array configuration is the (10,1) configuration. This configuration gives the best performance in terms of sensitivity and linear operational range and it is shown to have a linear sensitivity of 0.25 mm(-1) with non-linearity error of less than 2.0% (without additional nonlinear compensation) within a linear operation range of 15 mm. In addition, the linear range of the optimal linear array (10,1) configuration is up to 10 times greater than existing plastic fibre configurations, and about 30 times greater than existing glass fibre configurations. (C) 2014 Elsevier B.V. All rights reserved.

关键词： Self-reference sensor Intensity-modulated displacement sensor Plastic fibre optic sensor linear array sensor Displacement measurement

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Pyroelectric linear array sensor for object recognition

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OPTICAL ENGINEERING 2014年第2期53卷 023101-023101页

作者： Chari, Srikant Jacobs, Eddie L. Choudhary, Divya Univ Memphis Dept Elect & Comp Engn Memphis TN 38152 USA Christian Bros Univ Dept Elect & Comp Engn Memphis TN 38104 USA

This paper presents a proof of concept sensor system based on a linear array of pyroelectric detectors for recognition of moving objects. The utility of this prototype sensor is demonstrated by its use in trail monitoring and perimeter protection applications for classifying humans against animals with object motion transverse to the field of view of the sensor array. Data acquisition using the system was performed under varied terrains and using a wide variety of animals and humans. With the objective of eventually porting the algorithms onto a low resource computational platform, simple signal processing, feature extraction, and classification techniques are used. The object recognition algorithm uses a combination of geometrical and texture features to provide limited insensitivity to range and speed. Analysis of system performance shows its effectiveness in discriminating humans and animals with high classification accuracy. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.

关键词： linear array sensor pyroelectric detectors object recognition

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Inexpensive multispectral imaging device

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INSTRUMENTATION SCIENCE & TECHNOLOGY 2022年第5期50卷 543-559页

作者： Akkoyun, Fatih Adnan Menderes Univ Fac Engn Dept Mech Engn TR-09010 Aydin Turkey

Multi/hyperspectral imaging is an important technique to obtain color data and spectral monitoring. It is a precise remote sensing technique that includes two or more bands in the visible and invisible spectrum. This study demonstrates the design and construction of a low-cost, multispectral imaging system using a single linear array sensor and a varifocal lens coupled to individual spectral band-pass filters. The system allows the automated data acquisition of raw spectral data for seven spectral bands, each with different wavelengths. The raw data are visualized in real-time to generate images of spectral bands to obtain the desired spectral information on the computer graphical screen. sensor arrays with spectral responsivity between 0.3 and 1.05 mu m and motorized filter disks with a linear guide are used for acquiring data from specific wavelengths. Axis movement of the imaging device is achieved by a linear guide for spatial monitoring. Seven different bands are scanned and transferred to the computer via motorized band-pass filter sets with the imaging device. The multispectral imaging device has high accuracy with a 0.9936 linear correlation coefficient (r(2)) and averaged noise of the total system is below 1% (0.7%). Although the present configuration uses seven spectral bands including visible and narrow bandpass optical filters to obtain multispectral information from an object, the system is designed to have a replaceable and selectable motorized rotating filter, easily remounted, and adjusted up to forty spectral bands with 20 nm full width at half maximum (FWHM).

关键词： Bandpass filter linear array sensor motorized rotating disk multispectral imaging

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Precise Positioning Based on Pixel Differential in linear Optical sensor array

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Agriculture and Agricultural Science Procedia 2014年 2卷 10-17页

作者： Abdallah Alsayed Muhammad Razif Mahadi Department of Biological and Agricultural Engineering Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia

Precision farming emphasis on the efficient use of resources for optimizing the output. In the production of paddy, measurement of water level and the rate of rising are important factors. Sensing techniques suffer from some restrictions which restrict obtaining high accuracy and high resolution measurements such as noise of electrical sensor, sensing clear response, potential error, and environmental effects. This paper presents a non-contact method to measure position in linear motion. Moreover, this work is going to be background and concept for water level measuring system.

关键词： Position measurement water level linear array sensor

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Electrical impedance imaging based on ultrasonic B-mode image

Electrical impedance imaging based on ultrasonic B-mode imag...

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ICIIBMS 2015 Int C Intelligent Inform BioMedical

作者： Kimoto, Akira Hamatsu, Fumiya Saga Univ Grad Sch Sci & Engn Dept Adv Fush Technol Saga Japan Yokohama Natl Univ Grad Sch Yokohama Kanagawa Japan

ISBN: (纸本)9781479985623

This paper presents electrical impedance imaging based on ultrasonic B-mode image for detecting breast tumor. In the proposed system, a thin film with sixteen electrodes was pasted on the surface of the ultrasound probe. The proposed system allows both the electrical conductivity image by sixteen film electrodes and ultrasound image by the ultrasonic probe at same area. The electrical conductivity image is improved by using ultrasound image as the prior information. In the simulation and experiment, the electrical conductivity distribution at the simple breast model was reconstructed by the proposed system. The comparison between the electrical images with and without the ultrasound image as the prior information was presented. As results, it was found that the electrical conductivity distribution was clearly improved by using ultrasonic image as the prior information although the proposed system must be improved.

关键词： Ultrasonic imaging Electrical impedance imaging linear array sensor

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Application of high precision matching about multi-sensor in fast stereo imaging 19

Application of high precision matching about multi-sensor in...

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Conference on sensors, Systems, and Next- Generation Satellites XIX

作者： Zhang, Huijing Zhou, Mei Wu, Haohao Zhang, Dandan Chinese Acad Sci Acad Optoelect Key Lab Quantitat Remote Sensing Informat Technol Beijing 100094 Peoples R China

ISBN: (纸本)9781628418491

High precision matching of linear array multi-sensor is the key to ensure fast stereo imaging. This paper has presented the general principle of active and passive imaging sensor, designed a high precision matching calibration system of linear array multi-sensor based on large-diameter collimator combined with assisted laser light source, and put forward an optical axis parallelism calibration technology suitable for linear array active and passive imaging sensor. This technology makes use of image acquisition system to obtain spot center, in order to match multi-linear array laser receive and transmit optical axes. At the same time, this paper uses linear visible light sources to extract the optical axis of the laser, then completes the parallelism calibration between lasers receive and transmit optical axes of multi-linear array sensors and active and passive optical axis. The matching relationship between the visible pixel and laser radar detecting element can be obtained when using this technique to calibrate the active and passive imaging sensor. And this relationship is applied to the fast stereo imaging experiment of active and passive imaging sensor and gained good imaging effect.

关键词： Fast stereo imaging optical axis multi-axes parallelism linear array sensor active and passive

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Electrical impedance imaging based on ultrasonic B-mode image

Electrical impedance imaging based on ultrasonic B-mode imag...

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International Conference on Intelligent Informatics and Biomedical Sciences

作者： Akira Kimoto Fumiya Hamatsu dept. of Advanced Fushion Technology Graduate School of Science and Engineering Saga University Graduate School of Yokohama National University

ISBN: (纸本)9781479985630

关键词： Ultrasonic imaging Electrical impedance imaging linear array sensor

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Three-dimensional surface profile measurement of a moving object by a spatial-offset phase stepping method

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OPTICAL ENGINEERING 2003年第1期42卷 137-142页

作者： Yoneyama, S Morimoto, Y Fujigaki, M Ikeda, Y Wakayama Univ Dept Optomechatron Wakayama 6408510 Japan

This study proposes a new method for measuring the 3-D surface profile of an object moving at constant speed. A sinusoidal grating pattern is projected on a moving object. Then, grating patterns that are deformed according to the profile of the object are acquired by three linear array sensors. Since a linear array sensor records light intensity along an original grating line, the resultant image forms a fringe pattern that represents the profile of the object. Using three images obtained by the three linear array sensors, the phase distribution of the fringe pattern is calculated by a phase stepping method without any phase stepping devices. Consequently, the profile of the moving object can be evaluated from the phase of the fringes, since the value of the phase is simply proportional to the height of the object. Experimentation demonstrates that the accuracy is about 4.3% for the wrapped phase range of 2pi rad with a speckle pattern present. The proposed method can be used for inspection of moving objects such as products on an assembly line. (C) 2003 Society of Photo-Optical Instrumentation Engineers.

关键词： optical measurement image processing relative shape measurement phase stepping method linear array sensor moving object

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