Laser goniometer systems for dynamic calibration of optical encoders

Filatov, Yu. V.; Agapov, Mikhail Yu.; Bournachev, M N; Loukianov, D. P.; Pavlov, P. A.

doi:10.1117/12.501348

Cited by 16 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…And CodeAllM consists of FineCode and CoarseCode, which is the total code of the measured shaft position . is the resolution of the angle encoder measuring system [8,9]. Thus, the measured position is digitalized with the subdivision error brought by and .…”

Section: Subdivision Error Compensation Algorithm Proposed In Tcsmentioning

confidence: 99%

“…Russia, Japan, and Germany are now leading the world's encoder error detection research [8]. St. Petersburg State Electrotechnical University developed an encoder error detection system with an accuracy of 0.1 at speeds of up to 10 RPS, which can realize dynamic error detection [9]. A set of encoder error detection lab systems with a resolution of 0.001 and an uncertainty of ±0.05 has been developed by National Institute of Advanced Industry Science and Technology in Japan [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Subdivision Error Analysis and Compensation for Photoelectric Angle Encoder in a Telescope Control System

Wang

Yan

et al. 2015

Mathematical Problems in Engineering

View full text Add to dashboard Cite

As the position sensor, photoelectric angle encoder affects the accuracy and stability of telescope control system (TCS). A TCS-based subdivision error compensation method for encoder is proposed. Six types of subdivision error sources are extracted through mathematical expressions of subdivision signals first. Then the period length relationships between subdivision signals and subdivision errors are deduced. And the error compensation algorithm only utilizing the shaft position of TCS is put forward, along with two control models; Model I is that the algorithm applies only to the speed loop of TCS and Model II is applied to both speed loop and position loop. Combined with actual project, elevation jittering phenomenon of the telescope is discussed to decide the necessity of DC-type subdivision error compensation. Low-speed elevation performance before and after error compensation is compared to help decide that Model II is preferred. In contrast to original performance, the maximum position error of the elevation with DC subdivision error compensation is reduced by approximately 47.9% from 1.42″to 0.74″. The elevation gets a huge decrease in jitters. This method can compensate the encoder subdivision errors effectively and improve the stability of TCS.

show abstract

Section: Subdivision Error Compensation Algorithm Proposed In Tcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Subdivision Error Analysis and Compensation for Photoelectric Angle Encoder in a Telescope Control System

Wang

Yan

et al. 2015

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…Especially, it also faces problems such as random quantization error noise [35] and encoder manufacturing or installation errors [36], which leads to large content of false IAS components. To suppress this false IAS, encoder needs to be calibrated by a instrument with higher accuracy [36], [37]. Still, the encoder errors generate again once the encoder is mounted on another shaft and recalibration is required.…”

Section: Introductionmentioning

confidence: 99%

Planetary Gear Fault Diagnosis Based on An Instantaneous Angular Speed Measurement System With a Dual Detector Setup

Zeng

Feng²,

Shao

et al. 2020

IEEE Access

View full text Add to dashboard Cite

Planetary Gearbox (PG) is widely used in many vital transmission systems with the advantages such as high power-weight ratio and high load capacity. To maintain the performance of these system, extensive attentions are paid in the vibration signal analysis for early fault detection and diagnosis of PGs. However, vibration signals are less accurate as they severely influenced by multi-interfaces energy dissipation and varying transmission paths. In contrast, Instantaneous Angular Speed (IAS) is directly related to the gear dynamics and free from the path varying effect. This paper evaluates the performance of an improved IAS measurement system to diagnose PG faults, in which a dual detector setup is adopted to suppress IAS errors caused by the setting parameters and encoder errors. Firstly, a PG dynamic model is established to simulate IAS responses from a PG with local faults on sun and planet gears. Secondly, the noise level of the demodulated IAS is studied under different system parameter configurations. Subsequently, a dual detector self-denoising method is developed to suppress the false IAS caused by encoder errors. Finally, the performance of proposed IAS measurement system is evaluated based on an industrial PG with sun and planet faults. Experimental results show PG faults can be effectively diagnosed from the simple IAS order spectra, indicating that the proposed IAS measurement system is a more promising and yet lower costing approach to monitor rotating machines.INDEX TERMS Planetary gear, fault diagnosis, dual detector; instantaneous angular speed, encoder error suppression.

show abstract

“…St. Petersburg State Electrotechnical University developed an encoder error detection system with an accuracy of 0.1” at the speed of up to 10 Round Per Second (RPS), which can realize dynamic error detection [5]. Wan et al from Changchun Institute of Optics, Fine Mechanical, and Physics, Chinese Academy of Sciences, designed a high-precision photoelectric angle encoder with a dual-reading system, which satisfies the technique requirements of spaceborne equipment [6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System

Wang

Zhou

et al. 2018

Sensors

View full text Add to dashboard Cite

Photoelectric angle encoders, working as position sensors, have a great influence on the accuracy and stability of telescope control systems (TCS). In order to improve the tracking precision of TCS, a method based on subdivision error compensation for photoelectric angle encoders is proposed. First, a mathematical analysis of six types of subdivision errors (DC error, phase error, amplitude error, harmonic error, noise error, and quantization error) is presented, which is different from the previously used analysis based on the Lissajous figure method. In fact, we believe that a mathematical method is more efficient than the figure method for the expression of subdivision errors. Then, the distribution law and period length of each subdivision error are analyzed. Finally, an error compensation algorithm is presented. In a real TCS, the elevation jittering phenomenon occurs, which indicates that compensating for the amplitude error is necessary. A feed-forward loop is then introduced into the TCS, which is position loop- and velocity loop-closed, leading to a decrease of the tracking error by nearly 54.6%, from 2.31” to 1.05”, with a leading speed of 0.25°/s, and by 40.5%, from 3.01” to 1.79”, with a leading speed of 1°/s. This method can realize real-time compensation and improve the ability of TCS without any change of the hardware. In addition, independently of the environment and the kind of control strategy used, this method can also improve the tracking precision presumably because it compensates the measuring error inside the photoelectric angle encoder.

show abstract

Laser goniometer systems for dynamic calibration of optical encoders

Cited by 16 publications

References 1 publication

Subdivision Error Analysis and Compensation for Photoelectric Angle Encoder in a Telescope Control System

Subdivision Error Analysis and Compensation for Photoelectric Angle Encoder in a Telescope Control System

Planetary Gear Fault Diagnosis Based on An Instantaneous Angular Speed Measurement System With a Dual Detector Setup

Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System

Contact Info

Product

Resources

About