An accelerometer with integrative intensity-modulated optical encoder and patterned leaf spring for low-frequency vibration monitoring

Li, Hongzhong; Yu, Haoyu; Jiang, Weitao; Li, Xuan; Fan, Shanjin; Lei, Biao; Shi, Yongsheng; Yin, Lei; Chen, Bangdao

doi:10.1016/j.sna.2016.06.026

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…Back in the 1950s, optical linear encoders began to be adopted in machine tools for direct position feedback [ 2 ]. Today, optical encoders are widely used in numerous applications where position measurements are vital to controls, from printers in households [ 3 ] to industrial robot arms [ 4 ], high-end 3D printers [ 5 ], accelerometers [ 6 ], high-end medical instruments, such as MRI [ 7 ], and wafer scanners in the semiconductor industry [ 8 ]. The resolutions of optical linear encoders should be at least 10 times finer than the accuracy of the designed machines so that control accuracy can be ensured [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

A Method to Improve Mounting Tolerance of Open-Type Optical Linear Encoder

Kilikevičius

Yang

et al. 2023

Sensors

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Accuracy becomes progressively important in the wake of development in advanced industrial equipment. A key position sensor to such a quest is the optical linear encoder. Occasionally, inappropriate mounting can cause errors greater than the accuracy grade of the optical linear encoder itself, especially for open-type optical linear encoders, where the mounting distance between the reading head and main scale must be accurately controlled. This paper analyzes the diffraction fields of a traditional scanning reticle made by amplitude grating and a newly designed combined grating; the latter shows a more stable phase in mathematical calculation and simulations. The proposed combined gratings are fabricated in a laboratory and assembled into the reading heads. The experimental results indicate that the mounting tolerance between the reading head and the main scale of the optical linear encoder can be improved.

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Section: Introductionmentioning

confidence: 99%

A Method to Improve Mounting Tolerance of Open-Type Optical Linear Encoder

Kilikevičius

Yang

et al. 2023

Sensors

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“…The timely and accurate analysis of deterioration factors inside civil constructions can provide prompt solutions and prevent accidental destruction [5][6][7][8]. Several computation methods and experimental schemes of vibration sensing devices have been proposed, including laser Doppler vibrometers [9][10][11] and fiber optics-based sensors [12][13][14][15][16][17][18][19][20]. Laser vibrometers 1289 (2023) 012036 IOP Publishing doi:10.1088/1757-899X/1289/1/012036 2 are unstable as their operation is susceptible to the vibration of their locations, leading to significant measurement uncertainty, and they are vulnerable to environmental factors.…”

Section: Introductionmentioning

confidence: 99%

Spot size-based laser vibrometer using an advanced image sensor for structural health monitoring

Cao,

Phan,

Hoang

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Failure-induced vibrations are a common phenomenon in many civil structures, and the characterization of their vibration frequencies is crucial for monitoring their structural health. This paper presents a new optics-based mechanical system that can monitor the vibrations of civil structures through the fluctuation of laser spot size using advanced image sensors. The principle behind this vibrometer combines mechanical oscillation and laser optics, and it provides information on vibration through the precise variation of spot size in a low-cost, low-risk, and high-speed manner. The system comprises simple components that are easily integrated into various civil structures. Therefore, this novel approach offers a promising method for effectively monitoring the health of civil structures.

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“…The striking feature of these techniques is the fact that they employ laser-based devices. Particularly, they can be laser Doppler vibrometers [6][7][8] or fiber opticsbased sensors [9][10][11]. Nevertheless, in this case, the device is demonstrated not to be very susceptible to the vibration of the construction where they are located.…”

Section: Introductionmentioning

confidence: 99%

Laser-based vibration measurement using diffractive beam samplers for vibration monitoring of large-scale bridges

Hoang,

Cao,

Nguyen

et al. 2023

UD-JST

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This paper introduces an innovative design for a laser-based apparatus employing diffractive beam sampling technology, with the primary purpose of characterizing vibration frequencies induced within large-scale bridges. The functioning principle of the device hinges upon its ability to discern minute alterations in the relative positions of a subset of the laser beam, resulting from the oscillatory behavior of a laser pendulum mechanism. The captured dynamic variations are seamlessly integrated into a real-time monitoring framework through the utilization of an adept image sensor, complemented by sophisticated software functionalities. Noteworthy for its amalgamation of straightforward implementation and remarkable precision, the proposed methodology stands as a potent instrument poised to ensure the secure and robust surveillance of the structural well-being of large-scale bridges.

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An accelerometer with integrative intensity-modulated optical encoder and patterned leaf spring for low-frequency vibration monitoring

Cited by 10 publications

References 18 publications

A Method to Improve Mounting Tolerance of Open-Type Optical Linear Encoder

A Method to Improve Mounting Tolerance of Open-Type Optical Linear Encoder

Spot size-based laser vibrometer using an advanced image sensor for structural health monitoring

Laser-based vibration measurement using diffractive beam samplers for vibration monitoring of large-scale bridges

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