A Low-Cost Submicrolinear Incremental Encoder Based on 3 $\times$3 Fiber-Optic Directional Coupler

Chow, H.W.; Cheung, N.C.; Jin, Wei

doi:10.1109/tim.2009.2021622

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…In [16][17][18], an incremental encoder combined with Hall sensors separately mounted by 120 degrees were used to detect the position information. In the whole operation process, the real-time running position of the joint is detected and fed back by the incremental encoder.…”

Section: A New Position Detection and Status Monitoringmentioning

confidence: 99%

“…However, the incremental encoder cannot memorise and provide the initial position of the joint when the power is on at the first time. In [16][17][18], the Hall sensors with an electric angle of 120 degrees apart are used to provide the initial position information. After the initial position is judged, the Hall sensor immediately stops working and switches to the incremental encoder.…”

Section: A New Position Detection and Status Monitoringmentioning

confidence: 99%

See 1 more Smart Citation

A New Position Detection and Status Monitoring System for Joint of SCARA

Lü

Tang

et al. 2021

IEEE/ASME Trans. Mechatron.

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High precision position detection of joint and status monitoring of speed reduction gearbox (SRG) are two key technologies in the research and development of selective compliant assembly robot arm (SCARA). The existing schemes have some problems, such as the large occupation of space, high cost, complex implementation, lack of status monitoring, etc. Therefore, firstly, in order to get the accurate position information of joint when the SCARA is powered up at the first time, a new combined incremental encoder with unevenly distributed multiple indexing signals and initial position detection method is proposed. Secondly, in order to get the accurate position information and monitor the operation status of the SRG during the positioning operation, a real-time position detection and status monitoring method based on the transmission error using dual incremental encoder is proposed. The general design principle has been given, and various experimental results have confirmed the effectiveness of the proposed solution. The proposed new combined incremental encoder has the advantage of small occupied space, easy realization and low cost. The proposed position detection and status monitoring method not only realizes the high precision detection of the joint position but also provides the key data for the monitoring of the running state of the SRG.

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Section: A New Position Detection and Status Monitoringmentioning

confidence: 99%

Section: A New Position Detection and Status Monitoringmentioning

confidence: 99%

A New Position Detection and Status Monitoring System for Joint of SCARA

Lü

Tang

et al. 2021

IEEE/ASME Trans. Mechatron.

View full text Add to dashboard Cite

show abstract

“…It is thus important to find an easy and quick method to detect these mura defects. For this purpose, an interference pattern [8]- [10] and a statistical measurement method (the binary classification method) are introduced in this paper, which offers faster inspection for the detection of mura defects. 0018-9456 c 2013 IEEE Our novel method focuses on the pretesting process.…”

Section: Introductionmentioning

confidence: 99%

Detection of Gap Mura in TFT LCDs by the Interference Pattern and Image Sensing Method

Tsai

Chang

2013

IEEE Trans. Instrum. Meas.

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In this paper, we focus on pretesting to find the gap mura defects before the injection of liquid crystal into the cell of a thin-film-transistor liquid-crystal display panel. An optical interference pattern sensing method for inspection of the gap mura defects is used. We propose automatic quantization of mura panel defects in terms of the crossing points of the interference pattern. By doing so, panels with unacceptable gap mura could be sorted out simply by a binary classification, which facilitates automated visual inspection. The advantages of using this method include that it allows for pretesting before the injection of liquid crystal, meaning that defective panels can be found before the next process step and the wastage of liquid crystal materials can be avoided. The yield rate and manufacturing process efficiency can be improved and the inspection time can be shortened from 20 s by human inspection to less than 2 s by automatic inspection. Experiment results show that the proposed method offers improved performance for gap mura detection.

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“…Over the past three decades, non-contact fibre-optic interferometric displacement sensor systems have been extensively studied. The commonly used configurations for fibre-optic interferometric displacement sensors include Mach-Zehnder interferometers [1], Michelson interferometers [2][3][4][5] and Fabry-Perot interferometers [6][7][8][9][10][11][12][13][14]. On one hand, the Fabry-Perot interferometers are extremely sensitive to perturbations that affect the optical path length between two reflectors of the Fabry-Perot cavity.…”

Section: Introductionmentioning

confidence: 99%

Self-calibrated non-contact fibre-optic Fabry–Perot interferometric vibration displacement sensor system using laser emission frequency modulated phase generated carrier demodulation scheme

Jia

Wang

2012

Meas. Sci. Technol.

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In this paper, the principle of a self-calibrated non-contact fibre-optic Fabry–Perot interferometric vibration displacement sensor (FOFPIVDS) system is described and experimentally demonstrated. According to the principle, the Fabry–Perot cavity, constituted by placing the end face of a gradient-index lens in parallel with the measured vibration surface, is used to translate the vibration displacement of the measured vibration surface into phase shifts in the interference signal output from the FOFPIVDS, and the laser emission frequency modulated phase generated carrier (FMPGC) demodulation scheme based on the arctangent (Arctan) algorithm is adapted to demodulate the phase shifts. After eliminating the optical power modulation in the laser emission frequency modulation, the sensing model for the FOFPIVDS system using the FMPGC–Arctan demodulation scheme is established. On these bases, the FOFPIVDS is designed and fabricated, and the prototyping FOFPIVDS system is built and experimentally tested. The research results indicate that the fabricated FOFPIVDS system possesses the characteristics as follows: (1) the sensitivity is only determined by the laser wavelength and the vibration displacement measurement is self-calibrated, (2) the nonlinearity is 0.29% and (3) the resolution is less than 2.06 nm.

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A Low-Cost Submicrolinear Incremental Encoder Based on 3 $\times$3 Fiber-Optic Directional Coupler

Cited by 6 publications

References 13 publications

A New Position Detection and Status Monitoring System for Joint of SCARA

A New Position Detection and Status Monitoring System for Joint of SCARA

Detection of Gap Mura in TFT LCDs by the Interference Pattern and Image Sensing Method

Self-calibrated non-contact fibre-optic Fabry–Perot interferometric vibration displacement sensor system using laser emission frequency modulated phase generated carrier demodulation scheme

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