Immersion-type KTP sensor for angular displacement measurement

Twu, Ruey-Ching; Yan, Nina-Yang

doi:10.1016/j.optlastec.2019.105690

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…Two power signals are subtracted from the receiving fibers mounted on both ends of the emitting fiber. While in Twu and Yan 17 an optical angle has been developed which is based on immersion type potassium titanyl phosphate. This sensor helps to determine the angular displacement in a homodyne interferometer.…”

Section: Related Workmentioning

confidence: 99%

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Micro-electromechanical system based optimized steering angle estimation mechanism for customized self-driving vehicles

Butt

Riaz

Khalid

et al. 2021

Measurement and Control

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In an automated steering system of the self-driving vehicles, the steering wheel angle is measured by the absolute angular displacement sensors or relative angle sensors. However, these sensors either encompass global navigation satellite systems (GNSS)/gyroscope – Micro Electromechanical-Sensor (MEMS) based solutions or comprise of the complex gear-based mechanical structure which results in latency and additive bias in the accumulative steering angle assessment. To address these issues, we propose a novel steering angle assessment system based on enhanced gear mechanism along with the adapted rotation paradigm for the customized self-driving vehicles. Additionally, a digital signal processing system has been introduced to resolve the issues in the identification of absolute central and max-bounding steering wheels position in self-driving vehicles. In assistance with the proposed mechanism, an algorithm has also been proposed to optimize the computed steering angle to minimalize the effect of additive bias in the accuracy. The proposed mechanism has been installed in the customized self-driving testbed vehicle and rigor validation has been performed in the straight and curvy road scenarios. Finally, the comparison study has been carried out between the conventional relative sensor and the proposed mechanism to show the accuracy and effectiveness of the proposed mechanism in terms of error rate, stability, and deviation.

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Section: Related Workmentioning

confidence: 99%

“…Moreover, the performance of the sensors developed in Refs. 4,[15][16][17] is affected by a harsh and dusty environment.…”

Section: Related Workmentioning

confidence: 99%

Micro-electromechanical system based optimized steering angle estimation mechanism for customized self-driving vehicles

Butt

Riaz

Khalid

et al. 2021

Measurement and Control

View full text Add to dashboard Cite

show abstract

“…Recently, optical systems for displacement measurement have been successfully applied in actual engineering, and good effects were achieved, such as photogrammetry, laser techniques, and visual techniques. More details about displacement measurement can be found in References [21][22][23][24][25].…”

Section: Damage Localization Of Grid Structure Based On Displacement mentioning

confidence: 99%

Model-Free Method for Damage Localization of Grid Structure

Yang

Wang

et al. 2019

Applied Sciences

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A model-free damage identification method for grid structures based on displacement difference is proposed. The inherent relationship between the displacement difference and the position of structural damage was deduced in detail by the Sherman–Morrison–Woodbury formula, and the basic principle of damage localization of the grid structure was obtained. That is, except for the tensile and compressive deformations of the damaged elements, the deformations of other elements were small, and only rigid body displacements occurred before and after the structural damage. According to this rule, a method for identifying the position of the damage was proposed for the space grid structure by using the rate of change of length for each element. Taking a space grid structure with a large number of elements as an example, the elastic modulus reduction method was used to simulate the damage to the elements, and the static and dynamic test parameters were simulated respectively to obtain the difference in displacement before and after the structural damage. The rate of change of length of each element was calculated based on the obtained displacement difference, and data noise was added to the simulation. The results indicated that the element with the larger length change rate in the structure was the most likely to be damaged, and the damaged element can be accurately evaluated even in the presence of noise in data.

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“…Optical sensors have a wide application in angular displacement measurement due to high resolution and long lifetime [6][7][8][9][10]. Among them, the grating is one of the typical optical sensors employed in the process and manufacturing industry, which detects the grating lines, fabricated by lithography, periodic changes to achieve angular displacement measurement [11,12].…”

Section: Introductionmentioning

confidence: 99%

A novel inductive angular displacement sensor based on time-grating

Sun¹,

Lv²,

Han³

et al. 2022

Meas. Sci. Technol.

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The paper proposes a novel inductive angular displacement sensor based on time-grating to measure large-diameter hollow rotating mechanical components in large science facilities. The sensor design includes a stator, a rotor with two layers of windings. The stator is fabricated according to the dimension of the rotor, which is the large-diameter hollow rotary mechanical components. Based on the electromagnetic induction, the theoretical model of angular displacement measurement is derived by mathematical equations in detail. The sensor design ensures integration of the large-diameter hollow rotating mechanical components with the stator, and solves the problem that the sensors cannot be coaxially installed in the closed-loop control process of large mechanical rotating parts. The performance of the sensor is evaluated by tests of the prototype sensor fabricated by printed circuit board technology, which manifests the effectiveness of the proposed sensor. The results demonstrate the peak-to-peak value of original dynamic error is 124 ″ over 0 ° - 360 ° range, and the measurement error mainly includes first-order and second-order harmonic components. Therefore, the original errors are reduced by optimizing the angular displacement algorithm of the sensor, optimized results demonstrate the final accuracy of the sensor is ±3.5 ″ over the 0 °- 360 ° measurement range.

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Immersion-type KTP sensor for angular displacement measurement

Cited by 6 publications

References 22 publications

Micro-electromechanical system based optimized steering angle estimation mechanism for customized self-driving vehicles

Micro-electromechanical system based optimized steering angle estimation mechanism for customized self-driving vehicles

Model-Free Method for Damage Localization of Grid Structure

A novel inductive angular displacement sensor based on time-grating

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