A survey on the grating based optical position encoder

Yu, Haoyu; Chen, Xiaolong; Liu, Chanjun; Cai, Guoyin; Wang, Weidong

doi:10.1016/j.optlastec.2021.107352

Cited by 46 publications

(13 citation statements)

References 115 publications

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“…As stated in [35] a grating based optical encoder is the industry choice when displacement and position measurements are needed for fabrication and testing in precision machinery. So the design of the test rig takes aim of the use of a grating based optical encoder.…”

Section: Mechanical Design Of Test Rigmentioning

confidence: 99%

Design and Fabrication of a Test Rig for a New Approach on Health Monitoring of Roller Bearings Using Acoustic Emission

Bjarkason

Asgeirsson²,

Unnþórsson

2022

Volume 5: Dynamics, Vibration, and Control

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This article presents the design, equipment selection and implementation of a test rig using non-destructive evaluation (NDE) for rolling element bearings used in Vertical Axis Wind Turbines (VAWT), designed and manufactured by Icewind in Iceland. The design is outlined along with the description and preliminary results of a pilot test of the rig. Features of Acoustic emission waves are used for the health monitoring and fault detection. The proposed method of using AE wave segments to construct a surface plot of features is presented. The usage of a high precision encoder to map the acoustic wave over the rotation of the bearing is proposed and demonstrated. Using surface feature plots and the mapped location in the rotation is an intuitive way to characterise the AE signal for condition monitoring, and allows for the possibility to locate defects in bearings effectively providing additional information to time frequency analysis such as Fourier transformations on the acoustic signal.

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Section: Mechanical Design Of Test Rigmentioning

confidence: 99%

Design and Fabrication of a Test Rig for a New Approach on Health Monitoring of Roller Bearings Using Acoustic Emission

Bjarkason

Asgeirsson²,

Unnþórsson

2022

Volume 5: Dynamics, Vibration, and Control

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“…The common initial resolutions of the laser interferometers are about 0.32 μm or 0.16 μm, depending on the optical structure [ 2 ] ( Table S1, Supplementary Material ). The initial resolution of the laser interferometer is several times higher than that of a grating-based encoder system [ 3 ], and laser interferometers also have the feature of error reduction [ 4 , 5 , 6 ]. Therefore, the interferometry−based encoders have high potential in precision positioning.…”

Section: Introductionmentioning

confidence: 99%

A Novel Analog Interpolation Method for Heterodyne Laser Interferometer

Chang

Wang

et al. 2023

Micromachines

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Laser interferometer technology is used in the precision positioning stage as an encoder. For better resolution, laser interferometers usually work with interpolation devices. According to the interpolation factor, these devices can convert an orthogonal sinusoidal signal into several square-wave signals via digital processing. The bandwidth of the processing will be the limitation of the moving speed of the positioning stage. Therefore, the user needs to make a trade-off between the interpolation factor and the moving speed. In this investigation, a novel analog interpolation method for a heterodyne laser interferometer has been proposed. This method is based on the principle of the lock-in amplifier (LIA). By using the proposed interpolation method, the bandwidth of the laser encoder system can be independent of the interpolation factor. This will be a significant benefit for the ultra-high resolution encoder system and the laser interferometers. The concept, design, and experiment are revealed in this manuscript. The experimental results show that the proposed interpolation method can reach nanometer resolution with a heterodyne laser interferometer, and the bandwidth of the signal is independent of the resolution.

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“…On the other hand, grating interferometers are preferred in scenarios where environmental conditions cannot be precisely controlled [13][14][15][16]. For instance, in the case of precision machine tools, grating interferometers are commonly employed to measure workpiece processing [17][18][19]. The real time measurement is also needed in practical production [20].…”

Section: Introductionmentioning

confidence: 99%

Long binary coding design for absolute positioning using genetic algorithm

Wang,

Luo,

Gao

et al. 2023

Optical Metrology and Inspection for Industrial Applications X

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A survey on the grating based optical position encoder

Cited by 46 publications

References 115 publications

Design and Fabrication of a Test Rig for a New Approach on Health Monitoring of Roller Bearings Using Acoustic Emission

Design and Fabrication of a Test Rig for a New Approach on Health Monitoring of Roller Bearings Using Acoustic Emission

A Novel Analog Interpolation Method for Heterodyne Laser Interferometer

Long binary coding design for absolute positioning using genetic algorithm

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