scholarly journals A High Precision Time Grating Displacement Sensor Based on Temporal and Spatial Modulation of Light-Field

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 921 ◽  
Author(s):  
Min Fu ◽  
Changli Li ◽  
Ge Zhu ◽  
Hailin Shi ◽  
Fan Chen
Keyword(s):  
High Precision ◽  
Light Field ◽  
Light Transmission ◽  
Low Cost ◽  
Optimization Method ◽  
Spatial Modulation ◽  
Displacement Sensor ◽  
High Precision Measurement ◽  
Object Movement ◽  
Field Modulation

A new displacement sensor with light-field modulation, named as time grating, was proposed in this study. The purpose of this study was to reduce the reliance on high-precision measurements on high-precision manufacturing. The proposed sensor uses a light source to produce an alternative light-field simultaneously for four groups of sinusoidal light transmission surfaces. Using the four orthogonally alternative light-fields as the carrier to synthesize a traveling wave signal which makes the object movement in the spatial proportion to the signal phase shift in the time, the moving displacement of the object can be measured by counting time pulses. The influence of the light-field distribution on sensor measurement error was analyzed in detail. Aimed to reduce these influences, an optimization method that used continuous cosinusoidal light transmission surfaces with spatially symmetrical distribution was proposed, and the effectiveness of this method was verified with simulations and experiments. Experimental results demonstrated that the measurement accuracy reached 0.64 μm, within the range of 500 mm, with 0.6 mm pitch. Therefore, the light-field time grating can achieve high precision measurement with a low cost and submillimeter period sensing unit.

Research on a Novel High-Precision Intelligent Displacement Sensor

2006 ◽  
Vol 113 ◽  
pp. 435-441 ◽  
Author(s):  
Xiao Kang Liu ◽  
Dong Lin Peng ◽  
Xing Hong Zhang ◽  
Xi Hou Cheng
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Angular Displacement ◽  
Low Cost ◽  
High Accuracy ◽  
Displacement Sensor ◽  
Test Results ◽  
High Precision Measurement ◽  
Time Space ◽  
Space Coordinate

A theory of time-space coordinate transformation is presented for measuring space with time. A novel type of displacement sensor named time grating is developed, and methods of electronic rectifying, self-compensation and self-correction are proposed to intelligentize the sensor. Experiment results coming from applications conform to the validity of the proposed theory and methods. The experiment and test results show that high-precision measurement is achieved without high-precision manufacture and that angular displacement is measured very accurately without a dividing scale, which embeds the remarkable characteristics of low cost but high accuracy to the time grating sensor.

Novel High Precision Digital Curvilinear Displacement Sensor

2010 ◽  
Vol 44-47 ◽  
pp. 326-329
Author(s):  
Liang Hua ◽  
Ju Ping Gu ◽  
Yu Jian Qiang ◽  
Lin Lin Lv
Keyword(s):  
High Precision ◽  
High Frequency ◽  
Low Cost ◽  
Structure Design ◽  
Displacement Sensor ◽  
General Application ◽  
Interface Circuit ◽  
Displacement Sensors ◽  
Working Principle ◽  
Displacement Based

This study put forward a novel high precision digital curvilinear displacement sensor.The high frequency pulses were used to represent the magnitude of curvilinear displacement based on geometry analyse. The mechanical structure design of the sensor was completed. The working principle of curvilinear displacement sensor was analyzed in detail. The hardware and software design of the interface circuit of the sensor was completed and the performance of the sensor was analyzed. Compared with the traditional curvilinear displacement sensors, the sensor proposed in this paper has features of high precision, efficiency, explicit structure, low cost, wide measuring range, no need to adjust zero and it has general application value in industry field.

Study of a high-precision displacement sensor based on a configured moving light field with uniform scanning

2020 ◽  
Vol 31 (7) ◽  
pp. 075105
Author(s):  
Min Fu ◽  
Shuangya Zhang ◽  
Ge Zhu ◽  
DongLin Peng ◽  
Ziran Chen ◽  
...  
Keyword(s):  
High Precision ◽  
Light Field ◽  
Displacement Sensor ◽  
Uniform Scanning

Two-dimensional high-precision non-contact automatic measurement method based on image corner coordinates

2021 ◽  
pp. 095440622098112
Author(s):  
Maoyue Li ◽  
Yonghao Xu ◽  
Zengtao Chen ◽  
Kangsheng Ma ◽  
Lifei Liu
Keyword(s):  
High Precision ◽  
Measurement Method ◽  
Low Cost ◽  
Automatic Measurement ◽  
Detection Algorithm ◽  
Contour Detection ◽  
Two Dimensional ◽  
High Precision Measurement ◽  
Standard Size ◽  
Actual Size

Aiming at some shortcomings of the existing non-contact two-dimensional high-precision measurement methods, this paper proposes a two-dimensional high-precision non-contact automatic measurement method based on the corner coordinates of the image. Firstly, this paper designs a set of simple image acquisition device and explains the advantages of the Canny operator used in the image contour detection algorithm. Subsequently, this paper proposes a dimension calibration algorithm based on image corner coordinates, which can convert the pixel size to the actual size, and achieves the function of the algorithm by hierarchical, multi-step processing of the image. Finally, in order to realize the intelligent positioning and selection of the standard size workpiece position, an automatic measurement and positioning system is designed, which can convert the actual size signal into the pulse time control signal. The experimental results show that the measurement method proposed in this paper has the advantages of fast measurement speed, high robustness, low cost and high degree of automation. When using a black-and-white checkerboard paper with an accuracy of 0.1 mm, the measurement accuracy can reach the micron level.

Research on High Precision and Non-Contact Measuring System for Geometric Parameter of the Irregular Shape

2011 ◽  
Vol 128-129 ◽  
pp. 694-697
Author(s):  
Yu Hua Cheng ◽  
Li Bing Bai ◽  
Lin Nie
Keyword(s):  
High Precision ◽  
Geometric Parameter ◽  
Large Scale ◽  
Low Cost ◽  
Automatic Measurement ◽  
Ccd Camera ◽  
Irregular Shape ◽  
Measuring System ◽  
High Precision Measurement ◽  
Low Efficiency

Traditional measurement for geometric parameter of the irregular shape is considered as high cost and low efficiency, and large-scale automatic measurement cannot be achieved. In this paper, a low-cost, high-precision measurement system of irregular shape is presented. The system based on linear array CCD non-contact measurement method, in which a CCD camera is controlled to scan the projection of thread in the parallel optical field to acquire thread images. Meanwhile, an edge detection method based on gradient operator and linear fitting principle is proposed, the results show that the design improve the measurement precision efficiently.

Development of Novel High Precision Angular Displacement Sensor

2010 ◽  
Vol 97-101 ◽  
pp. 4332-4336
Author(s):  
Liang Hua ◽  
Hao Feng ◽  
Ju Ping Gu
Keyword(s):  
High Precision ◽  
Software Design ◽  
Angular Displacement ◽  
Low Cost ◽  
Structure Design ◽  
Displacement Sensor ◽  
General Application ◽  
Interface Circuit ◽  
Displacement Sensors ◽  
Working Principle

This study put forward a novel high precision digital angular displacement sensor. The mechanical structure design of the sensor was completed. The working principle of angular displacement sensor was analyzed in detail. The hardware and software design of the interface circuit of the sensor was completed and the performance of the sensor was analyzed. Compared with the traditional angular displacement sensors, the angular displacement sensor proposed in this paper has features of high precision, efficiency, explicit structure, better maintainability, low cost, wide measuring range, direction-judgement, no need to adjust zero and it has general application value in industry field.

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