Electronic Interpolation Interface Based on Linear Subdivision Method for Sinusoidal Optical Encoders

Zhao, Guobo; Ye, Guoyong; Liu, Hui; Lei, Biao; Li, Xuan; Han, Weiliang

doi:10.1109/jsen.2019.2961177

Cited by 17 publications

(5 citation statements)

References 33 publications

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“…The digital interpolator is usually composed of an input circuit (usually a differential circuit), an ADC, an MCU, and a digital output circuit (usually a comparator circuit) [ 7 , 8 , 9 , 10 , 11 ]. The feature of the interpolator not only enhances the resolution, but also enhances the frequency of the output signal.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, interpolation technology is applied for better resolutions [ 7 ]. From the previous research, the interpolation technologies are based on digital signal processing, especially the analog-to-digital converter (ADC), processing algorithms, and microcontroller unit (MCU) [ 8 , 9 , 10 , 11 ]. The block diagram and the sketch of the signal converting of the interpolation module are shown in Figure 1 and Figure 2 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Analog Interpolation Method for Heterodyne Laser Interferometer

Chang

Wang

et al. 2023

Micromachines

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“…In general, the subdivision methods include electrical subdivision [12][13][14] and optical subdivision [15][16][17][18]. The level of electronic subdivision is limited by the quality of the original signal, which means that the corresponding circuit design is required to filter the noise in the signal.…”

Section: Introductionmentioning

confidence: 99%

Improving the optical subdivision ability of a grating interferometer via double-row reverse blazed gratings

Zhang

Dong

Zhao

et al. 2023

Optics and Lasers in Engineering

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“…The position resolution is still limited below the maximum available encoder pulses. In [ 7 ], the electronic interpolation is added between two encoder counts. In this case, the position resolution can be increased by adding the ADC resolution into total quadrature pulses.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Permanent Magnet Drive Using Separated Observers for Acceleration Estimation and Control

Lin

Chou

Yang

2022

Sensors

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This paper proposes a high-resolution permanent magnet (PM) motor drive based on acceleration estimation and control. The PM motor is widely implemented in the printed circuit board (PCB) manufacturing process. To achieve the demanded 1 μm drilling resolution, a sine/cosine incremental encoder is usually installed for motion control. In this paper, several improvements are developed to increase the motion control steady-state accuracy balancing transient response. First, the interpolation of every two encoder counts is proposed to increase the position sensing resolution. In this case, the transient response is improved through the high-resolution position feedback. Second, a closed-loop observer with two independent bandwidths is proposed for acceleration estimation. By using the interpolated position for acceleration estimation, the vibration-reflected high-frequency torque harmonics can be compensated through the acceleration closed-loop control. It reduces the steady-state error under the same sensing hardware. According to experimental results, both transient response and steady-state error can be improved on a PM motor using the proposed position interpolation and acceleration control.

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Electronic Interpolation Interface Based on Linear Subdivision Method for Sinusoidal Optical Encoders

Cited by 17 publications

References 33 publications

A Novel Analog Interpolation Method for Heterodyne Laser Interferometer

A Novel Analog Interpolation Method for Heterodyne Laser Interferometer

Improving the optical subdivision ability of a grating interferometer via double-row reverse blazed gratings

High-Resolution Permanent Magnet Drive Using Separated Observers for Acceleration Estimation and Control

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