scholarly journals Three-Probe Error Separation with Chromatic Confocal Sensors for Roundness Measurement

2021 ◽  
Author(s):  
Jiao Bai ◽  
Yingzuo Wang ◽  
Xiaohao Wang ◽  
Qian Zhou ◽  
Kai Ni ◽  
...  
Keyword(s):  
Measurement Accuracy ◽  
Orientation Angle ◽  
Axial Distance ◽  
Harmonic Suppression ◽  
Roundness Error ◽  
Error Separation ◽  
Displacement Sensors ◽  
Rotary Platform ◽  
Roundness Measurement ◽  
Better Than

AbstractIn this study, three-probe error separation was developed with three chromatic confocal displacement sensors for roundness measurement. Here, the harmonic suppression is discussed first to set suitable orientation angles among three sensors. Monte Carlo simulation is utilized to test the error separation and optimize the orientation angles and off-axial distance. The experimental setup is established using chromatic confocal sensors with a precise rotary platform. The experimental results show that the measured roundness with an orientation-angle combination of (0°, 90.1°, and 178.6°) is much better than that of another nonoptimal selection (0°, 90.4°, and 177.4°). The roundness error is only 0.7% between the proposed measurement system and an expensive ultraprecision roundness meter. Furthermore, it is proven that the eccentricity distance should be decreased as small as possible to improve the measurement accuracy. In sum, this paper proposes a feasible method for roundness measurement with reliable simulations, easily integrated sensors, and an ordinary precision rotary platform.

Research of Spindle Error Separation Mixed Method

2013 ◽  
Vol 718-720 ◽  
pp. 1201-1206
Author(s):  
Peng Qing Wang ◽  
Hong Jun Wang ◽  
Peng Wan ◽  
He Peng Gao
Keyword(s):  
Mixed Method ◽  
Critical Angle ◽  
Total Reflection ◽  
Measuring System ◽  
Displacement Sensor ◽  
Harmonic Suppression ◽  
Angle Sensor ◽  
Error Separation ◽  
Angle Method ◽  
Roundness Measurement

This paper introduces a spindle error separation technique called orthogonal mixed method. The problem of harmonic suppression is solved by the orthogonal mixed method, which exists in the process of measurement based on three point method.The measuring system consisting of a displacement sensor and a angle sensor is developed for spindle error and roundness measurement. Two sensors, which are placed in the same plane perpendicular to the spindle axis, are mutual into 900. The principle of the critical angle method of total reflection are used by two sensors to separate rotation error from spindle error. Above all, the measured results show that this method indeed solve the problem of harmonic suppression, make the results of measurement more accurate.

Shearer Shaft Roundness Error of Signal Processing

2011 ◽  
Vol 295-297 ◽  
pp. 427-431
Author(s):  
Song Yong Liu ◽  
Chen Xu Luo
Keyword(s):  
Signal Processing ◽  
Signal Acquisition ◽  
Angle Sensor ◽  
Roundness Error ◽  
Displacement Sensors ◽  
Measurement Signal ◽  
Real Value ◽  
The Fourier Transform ◽  
Measuring Signal ◽  
Roundness Measurement

For the measurement of shearer shaft geometry signal contain the axis of rotation error and the measurement error, made of two separate programs from shearer shaft the geometric method of measuring signal acquisition and signal processing error. The program is based on the analysis of the shearer shaft Two-point method of roundness measurement method and error separation technique. Using two displacement sensors and a combination of programs to measure the angle sensor, and an equation using the Fourier transform of elimination and separated from the measurement signal roundness. Then, 53H, and wavelet signal Noise algorithm such as the error of roundness error signal separation. Simulation results show that the method has a higher real value and better convergence for coal mining shaft roundness error in the separation of signal processing.

A New Capacitive Sensing System for Roundness Measurement

2013 ◽  
Vol 662 ◽  
pp. 754-757 ◽  
Author(s):  
Yu Zhen Ma ◽  
Xin Hua Wang ◽  
Hong Min Li ◽  
Xiao Dong ◽  
Yan Hui Kang
Keyword(s):  
Capacitive Sensor ◽  
Measuring System ◽  
Capacitive Sensing ◽  
Rotating Shaft ◽  
Contact Mode ◽  
Roundness Error ◽  
Sensing System ◽  
Displacement Sensors ◽  
Measurement Results ◽  
Roundness Measurement

A capacitive sensing system for measuring spindle roundness was proposed in this paper, it was different with the past method using inductive sensors and laser displacement sensors. Three capacitive displacement probes were installed circularly on the measured shaft, because of capacitive sensor with average effect in two electrode plates, it is able to overcome the affect of microscopic factors. while the shaft was rotating with a certain speed, the probes measured the shaft’s profile in non-contact mode simultaneously, then through linear combination for three output signals, the spindle error of the rotating shaft was eliminated, and the roundness error was effectively separated from the measurement results. The experiment results have verified the effectiveness of roundness error measuring system based on mutiple capacitive probes, this capacitive sensing system can be used for rotating shaft roundness measurement.

Review on Multi-Point Method for Roundness Error Separation

2013 ◽  
Vol 797 ◽  
pp. 555-560
Author(s):  
Fen Fen Zhou ◽  
Hui Zong Lu ◽  
Ju Long Yuan ◽  
Fan Li
Keyword(s):  
Data Processing ◽  
Future Development ◽  
Mixed Method ◽  
Measurement Errors ◽  
Measurement Accuracy ◽  
Development Trend ◽  
Point Method ◽  
Roundness Error ◽  
Error Separation ◽  
Processing Algorithms

While measurement accuracy can be increased through continuously improving instrument precision, certain measurement errors can be eliminated via data processing using properly devised processing algorithms. Multi-point roundness error separation methods that are the subjects of study in this paper are reviewed, in particularly, three-point method and other multi-point methods that are based on three-point roundness error separation method, such as two-point method, mixed method and four-point method are summarized. Finally a comparison between each separation methods mentioned in this paper is made. Our views of future development trend in multi-point roundness error separation methods are presented.

scholarly journals High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2842 ◽  
Author(s):  
Wei Liu ◽  
Bing Liang ◽  
Zhenyuan Jia ◽  
Di Feng ◽  
Xintong Jiang ◽  
...  
Keyword(s):  
Eddy Current ◽  
Measurement Accuracy ◽  
Characteristic Curve ◽  
Calibration Method ◽  
High Accuracy ◽  
Output Characteristic ◽  
Displacement Sensor ◽  
Support Vector ◽  
Displacement Sensors ◽  
Calibration Accuracy

High precision position control is essential in the process of parts manufacturing and assembling, where eddy current displacement sensors (ECDSs) are widely used owing to the advantages of non-contact sensing, compact volume, and resistance to harsh conditions. To solve the nonlinear characteristics of the sensors, a high-accuracy calibration method based on linearity adjustment is proposed for ECDSs in this paper, which markedly improves the calibration accuracy and then the measurement accuracy. After matching the displacement value and the output voltage of the sensors, firstly, the sensitivity is adjusted according to the specified output range. Then, the weighted support vector adjustment models with the optimal weight of the zero-scale, mid-scale and full-scale are established respectively to cyclically adjust the linearity of the output characteristic curve. Finally, the final linearity adjustment model is obtained, and both the calibration accuracy and precision are verified by the established calibration system. Experimental results show that the linearity of the output characteristic curve of ECDS adjusted by the calibration method reaches over 99.9%, increasing by 1.9–5.0% more than the one of the original. In addition, the measurement accuracy improves from 11–25 μ m to 1–10 μ m in the range of 6mm, which provides a reliable guarantee for high accuracy displacement measurement.

Scheme design and key technology verification of Narrow Angle Sensor for small body mission

2021 ◽  
Author(s):  
Fenzhi Wu ◽  
Xiao Liang ◽  
Yanpeng Wu ◽  
Yunfang Zhang ◽  
Yuan Zhao ◽  
...  
Keyword(s):  
Autonomous Navigation ◽  
Measurement Accuracy ◽  
Small Body ◽  
Spectral Observation ◽  
Detection Sensitivity ◽  
Composition Analysis ◽  
Processing Unit ◽  
Scientific Observation ◽  
Exploration Mission ◽  
Better Than

<p>   In small body exploration mission, the uncertainty of the target characteristics and the special weak gravitational environment put forward higher requirements for the optical autonomous navigation accuracy of the probe and the detection ability of the navigation sensor. Narrow Angel Sensor(Hereinafter referred to as NAS), as the key instrument of China’s first small body exploration mission, has both optical autonomous navigation function and scientific observation ability, and it must give consideration to both near and far, and achieve breakthroughs in dynamic range, detection sensitivity, pointing measurement accuracy, angular resolution and spectral observation ability. The specific performance is as follows: To capture and track Near Earth Asteroids 2016HO3 from tens of thousands of kilometers, NAS is required to have the ability of point target detection, and the detection sensitivity is better than MV10, and  the accuracy of pointing measurement is better than 1 ″. As the probe approaches the target, NAS must be able to clearly image the shape and surface texture of 2016HO3, so as to obtain the motion parameters such as the spin axis and rotation period of the target. In remote sensing and descending stage, the mission requires NAS to be able to carry out global centimeter scale and landing area millimeter scale multi-spectral observation of the target, and optical navigation uses high-resolution images to construct landmark feature library, so as to realize terrain relative navigation; meanwhile, the image is used to provide data support for the scientific research of the target topography, spectral characteristics and surface material composition analysis.</p> <p>   NAS adopts split design, and the detector part is composed of front door, baffle, focusing optical system, filter wheel, image processing circuit, and motor drive circuit, the algorithm is implemented in the image navigation processing unit. The prototype of the instruments has been developed, and the function and performances such as MTF, detection sensitivity, pointing measurement accuracy etc were verified. The instrument achieved expected design objectives,  and can meet the requirements of optical autonomous navigation and scientific observation for China’s small body exploration mission.</p>

Compact LowPass Filter with Wide StopBand Using Non-Uniform Microstrip Resonant Cells

2012 ◽  
Vol 263-266 ◽  
pp. 15-19
Author(s):  
Yan Liang ◽  
Xiao Ming Wu ◽  
Bi Hua Tang ◽  
Yong Le Wu
Keyword(s):  
Microstrip Line ◽  
Photonic Bandgap ◽  
Impedance Matching ◽  
Stop Band ◽  
Cutoff Frequency ◽  
Harmonic Suppression ◽  
Lowpass Filter ◽  
Measurement Results ◽  
Better Than

In this paper, a novel compact microstrip lowpass filter is designed. The proposed filter which is etched on the 50 Ω microstrip line consists of four non-uniform 1-D microstrip photonic bandgap (PBG) cells with different cutoff frequency.. The demonstration lowpass filter with 2.2 GHz cutoff frequency is designed, fabricated and measured. The measurement results show that the band rejection effect is better than -20 dB from 2.8 GHz to 10 GHz, the insertion is less than 2 dB, and the length of filter is 5.6 cm long. Compared with the conventional filter, the proposed filter has smaller size. Meanwhile, it overcomes the problems of narrow stop-band and low harmonic suppression. Furthermore, the impedance matching is not need to be considered. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

scholarly journals Research on Focal Length Measurement Scheme of Self-Collimating Optical Instrument Based on Double Grating

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2718
Author(s):  
Wenchang Yang ◽  
Zhiqian Wang ◽  
Chengwu Shen ◽  
Yusheng Liu ◽  
Shaojin Liu ◽  
...  
Keyword(s):  
Measurement Accuracy ◽  
Focal Length ◽  
Optical Path ◽  
Good Resolution ◽  
Mean Square ◽  
Optical Instrument ◽  
Moiré Fringes ◽  
Measurement Resolution ◽  
Designed Experiment ◽  
Better Than

In this paper, we propose a scheme for measuring the focal length of a collimating optical instrument. First, a mathematical model for measuring the focal length of a collimator with double gratings is derived based on the moiré fringe formula and the principles of geometric optics. Mathematical simulation shows that a slight difference in the focal length of two collimators has an important influence on the imaging law of moiré fringes. Our solution has a good resolution ability for focal length differences within 5‰, especially in the small angle range below 4°. Thus, the focal length of collimators can be measured by the amplification of the slight difference. Further, owing to the relative reference measurement, the measurement resolution at the symmetrical position of focal length is poor. Then, in the designed experiment, a corresponding moiré image at different angles is acquired using collimators with known focal length. The experimental results indicate that the root mean square error (RMSE) of the collimator corresponding to grating angles of 2°–4° is better than 4.7‰, indicating an ideal measurement accuracy of the proposed scheme. This work demonstrates that our proposed scheme can achieve an ideal accuracy in the measurement of a symmetrical optical path.

Statistical Analysis of the Roundness Error Data

2012 ◽  
Vol 472-475 ◽  
pp. 869-874 ◽  
Author(s):  
Zhao Peng Dong ◽  
Li Ling Huang ◽  
Hai Ting Xie ◽  
Fu Gui Huang
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Statistical Analysis ◽  
Normal Distribution ◽  
Mathematical Knowledge ◽  
Measurement Data ◽  
Roundness Error ◽  
Main Emphasis ◽  
The Mathematical Model ◽  
Roundness Measurement

In order to simulate the actual roundness measurement accurately, must find the mathematical model of the actual roundness data, the paper’s main emphasis is doing statistical analysis by plenty of measurement data of roundness, using mathematical knowledge to prove that the actual characteristics of roundness parameters obey the normal distribution, and providing the basis for subsequent computer simulation in the future

The Pulsed Thermocouple for Gas Turbine Application

1977 ◽  
Vol 99 (1) ◽  
pp. 1-10 ◽  
Author(s):  
D. Kretschmer ◽  
J. Odgers ◽  
A. F. Schlader
Keyword(s):  
Exact Solution ◽  
Temperature Distribution ◽  
Gas Turbine ◽  
Temperature Rise ◽  
Measurement Accuracy ◽  
Gas Analysis ◽  
Gas Turbine Combustor ◽  
Analogue Circuit ◽  
Good Repeatability ◽  
Better Than

A mechanically pulsed suction thermocouple has been developed. The gas to be measured is sucked through a sonic orifice, thus eliminating the influence of the velocity inside the combustor. The signal from the thermocouple is processed by an analogue circuit. Contrary to the usual approach to the problem of dynamic temperature measurements (i.e., the attempt to find an exact solution to the extrapolation of the temperature rise curve) in this work, a calibration of the probe was done. This calibration showed very little scatter and a good repeatability. The overall measurement accuracy was better than ±1 percent. As a test of application, a partial survey of the temperature distribution within an aircraft gas turbine combustor was done. A satisfactory agreement was observed between temperatures measured by the thermocouple and those determined from gas analysis. In this test the pulse thermocouple proved to be a reliable and fast tool for the measurement of local gas temperatures.

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