Research on Online Measurement Method of Hole Diameter and Position

2013 ◽  
Vol 347-350 ◽  
pp. 197-200
Author(s):  
Yu Gong ◽  
Jing Cai Zhang ◽  
Hong Qi Liu
Keyword(s):  
Comparative Analysis ◽  
Measurement System ◽  
Measurement Method ◽  
Measurement Methods ◽  
Hole Diameter ◽  
Laser Sensor ◽  
Online Measurement ◽  
Online Detection ◽  
Ccd Imaging ◽  
Inductive Sensor

In this paper, research on measurement methods of hole during the parts online detection has been made. Both diameter and position of the hole are going to be detected in the same measurement system. In order to obtain higher accuracy and efficiency, a comparative analysis test of using the contact probes, the inductive sensor, the laser sensor, the forward and back lighting CCD imaging have been achieved. Results show that the contact measurement using inductive sensor is more suitable for the system, for the reason that it has higher reliability and efficiency.

Portable Measurement Method of Loose Coal Thermo-Physical Parameters

2011 ◽  
Vol 422 ◽  
pp. 228-232 ◽  
Author(s):  
Qing Hua Chen ◽  
Guang Long Dai ◽  
Guo Shu Zhang
Keyword(s):  
Thermal Conductivity ◽  
Measurement System ◽  
Measurement Method ◽  
Reference Value ◽  
Measurement Methods ◽  
Physical Parameters ◽  
Single Chip ◽  
Present Measurement ◽  
Chip Technology ◽  
The Status

According to the status that most of the present measurement methods and systems should be make experiments in laboratory, which need collect samples from spot, then carry to laboratory. Base on parallel hot wired method theory and single-chip technology, conduct a research on portable measurement method of loose coal thermo-physical parameters, then can test thermal conductivity and diffusivity of loose coal out of laboratory, the measurement system is developed. The experiment shows that results of thermal conductivity and diffusivity are well repetition, and agree with the reference value of relative literatures. The application of this system will provide convenience for occasion that need get the loose coal thermo-physical parameters quickly.

An Integrated Measurement Platform for Piezoelectric Transformer Based on Virtual Instruments

2011 ◽  
Vol 301-303 ◽  
pp. 1507-1510
Author(s):  
Xing Cheng Zhang ◽  
Mao Kui Li ◽  
Jian Qiang Liu ◽  
Yun Xu Fu
Keyword(s):  
Software Design ◽  
Measurement System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Measurement Methods ◽  
Virtual Instruments ◽  
Response Signal ◽  
Piezoelectric Transformer ◽  
Research Section ◽  
Parameters Measurement

This paper presented an integrated measurement platform for piezoelectric transformer based on virtual instruments. Programmable signal generator was adopted to stimulate the piezoelectric transformer. Then an USB oscilloscope was used to acquire the response signal. We could get the results by analyzing the experimental data. The measurement accuracy and efficiency were greatly improved in the virtual instruments platform compared with the conventional measurement method. It was of great significance to the scientific research. Section I pointed out the problems in conventional piezoelectric transformer parameters measurement method and gave a solution of using virtual instruments technology to solve these problems. Section II described the hardware design of the measurement system. Section III described the software design of the virtual instruments measurement system. Conventional measurement methods and virtual instruments measurement method were compared in section IV.

scholarly journals Harmonization of Piece-by-Piece Measurement Methods of Roundwood Approved by Latvian Standard LVS 82:2003 “ Apaļo kokmateriālu uzmērīšana ”

2015 ◽  
Vol 1 ◽  
pp. 154 ◽  
Author(s):  
Ziedonis Miklašēvičs
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Measurement Methods ◽  
Surface Shape ◽  
Application Area ◽  
Diameter Measurement ◽  
Short Intervals ◽  
Measuring Accuracy ◽  
Round Timber

This paper analyses the volume differences of mixed pine and spruce roundwood loads and logs (roundwood assortiments) devided in to sample clusters according to the species, diameter, lenght and stem/log surface shape, stem zones and measured by the methods approved by standard LV 82:2003 „Apaļo kokmateriālu uzmērīšana”. The volumes of roundwood loads/logs determined by these methods were compared with the most precisious determination of the volume by Measuring Diameter in Short Intervals and the Top and Butt Diameter Measurement method. The volume of mixed pine and spruce round timber load determined by Measuring Diameter in Short Intervals using harvester measurement system is 2.44% higher than the volume determined by manual comparative the Top and Butt Diameter Measurement method. The volume deviation is in the range of accepted 3% measuring accuracy. The volumes of roundwood assortiments from neiloid zone of spruce stems determined according to the Mid Diameter Measurement method are 3.96% lower than the volumes determined by careful manual the Top and Butt Diameter Measurement method. The volume deviation surpass the acceptable measuring 3% accuracy. The volumes of roundwood assortiments from paraboloid zone of spruce and pine stems determined according to the Mid Diameter Measurement method are lower than the volumes determined by the Top and Butt Diameter Measurement method. The deviation is in the range of acceptable 3% measuring accuracy. This paper gives recommendations for adjusting the application area of different measurement methods for achieving the volume deviation in the range of accepted measuring accuracy.

Assessing bias, precision, and agreement in method comparison studies

2019 ◽  
Vol 29 (3) ◽  
pp. 778-796 ◽  
Author(s):  
Patrick Taffé
Keyword(s):  
Measurement Method ◽  
Method Comparison ◽  
Estimation Procedure ◽  
Measurement Methods ◽  
Repeated Measurements ◽  
Confidence Bands ◽  
The Other ◽  
Reference Standard ◽  
Simultaneous Confidence Bands ◽  
Index Of Agreement

Recently, a new estimation procedure has been developed to assess bias and precision of a new measurement method, relative to a reference standard. However, the author did not develop confidence bands around the bias and standard deviation curves. Therefore, the goal in this paper is to extend this methodology in several important directions. First, by developing simultaneous confidence bands for the various parameters estimated to allow formal comparisons between different measurement methods. Second, by proposing a new index of agreement. Third, by providing a series of new graphs to help the investigator to assess bias, precision, and agreement between the two measurement methods. The methodology requires repeated measurements on each individual for at least one of the two measurement methods. It works very well to estimate the differential and proportional biases, even with as few as two to three measurements by one of the two methods and only one by the other. The repeated measurements need not come from the reference standard but from either measurement methods. This is a great advantage as it may sometimes be more feasible to gather repeated measurements with the new measurement method.

Non-Contact Online Detection of Concentricity Error

2015 ◽  
Vol 733 ◽  
pp. 611-614
Author(s):  
Hong Zheng
Keyword(s):  
Measurement System ◽  
Three Dimensional ◽  
Error Evaluation ◽  
Dimensional Model ◽  
Online Detection ◽  
Three Dimensional Model ◽  
Geometric Tolerance ◽  
Structural Principle ◽  
Circularity Error ◽  
Cylindricity Error

This paper researches on the non-contact online detection of concentricity error, which mainly focus on the structural principle of the measurement system and the concentricity error evaluation methods. The paper using the method of projection, converting the three-dimensional model to a two-dimensional model and evaluating coaxially error. And it is validated by the simulation of MATLAB. In theory, the proposed measurement system can measure geometric tolerance, including coaxially error, cylindricity error, circularity error, etc.

Cross Calibration by FFT Equalization

1997 ◽  
Vol 119 (2) ◽  
pp. 236-242 ◽  
Author(s):  
K. Peleg
Keyword(s):  
Measurement Method ◽  
Functional Relationship ◽  
Measurement Methods ◽  
New Method ◽  
Measurement Systems ◽  
True Value ◽  
Calibration Problem ◽  
Regression Techniques ◽  
The Cross ◽  
Cross Calibration

The classical calibration problem is primarily concerned with comparing an approximate measurement method with a very precise one. Frequently, both measurement methods are very noisy, so we cannot regard either method as giving the true value of the quantity being measured. Sometimes, it is desired to replace a destructive or slow measurement method, by a noninvasive, faster or less expensive one. The simplest solution is to cross calibrate one measurement method in terms of the other. The common practice is to use regression models, as cross calibration formulas. However, such models do not attempt to discriminate between the clutter and the true functional relationship between the cross calibrated measurement methods. A new approach is proposed, based on minimizing the sum of squares of the differences between the absolute values of the Fast Fourier Transform (FFT) series, derived from the readings of the cross calibrated measurement methods. The line taken is illustrated by cross calibration examples of simulated linear and nonlinear measurement systems, with various levels of additive noise, wherein the new method is compared to the classical regression techniques. It is shown, that the new method can discover better the true functional relationship between two measurement systems, which is occluded by the noise.

DEVELOPMENT OF SOIL CLOD FINENESS MEASUREMENT SYSTEM WITH LASER SENSOR BY USING POLYGON MIRROR

2013 ◽  
Author(s):  
T. Izumi ◽  
A. Oida ◽  
H. Nakashima ◽  
J. Miyasaka ◽  
H ◽  
...  
Keyword(s):  
Measurement System ◽  
Laser Sensor

scholarly journals Comparison of three measurement methods of saturated hydraulic condutivity

2006 ◽  
Vol 3 (3) ◽  
pp. 987-1019 ◽  
Author(s):  
C. Fallico ◽  
E. Migliari ◽  
S. Troisi
Keyword(s):  
Hydraulic Conductivity ◽  
Measurement Method ◽  
Sandy Loam ◽  
Measurement Methods ◽  
Soil Core ◽  
Statistical Parameters ◽  
Factors Affecting ◽  
Average Value ◽  
Constant Head ◽  
Log Normal

Abstract. After pointing out the importance of the saturated hydraulic conductivity (ks) measurements and the difficulties and uncertainties that are present, and after recalling salient aspects of three well-known measurement methods of this parameter (i.e. constant-head tension infiltrometer (TI) method, constant-head pressure infiltrometer (PI) method and soil core (SC) estimates method), the results of an investigation on data which were obtained during a measurement campaign on an area of 800 m2, on a sandy loam hillslope, located in Southern Italy, were carried out again here. Three sets of values of ks, obtained with these measurement methods, were analyzed statistically, verifying that the log-normal distribution describes these better than the normal one; moreover, the more significant statistical parameters of each set were compared (average value , amplitude A, coefficient of variation CV and standard deviation SD), individualizing the more significant differences. The greatest value of hydraulic conductivity was found with method (PI), while the smallest with (SC) and the intermediate with (TI); these differences were translated into macroporosity and into the influence of the single measurement method. Moreover, referring to the possible factors affecting the results, the importance can be noted of the structure, the texture and the soil events, in terms of utilization, which can affect the measure of ks leading often to very different values even for similar soils, but with a different history, independently of the coincidence of the measurement points and they can be determining to explain the differences affecting the results obtained in analogous investigations by other researchers. Having confirmed that generalization is not possible, the need was emphasized to adopt the necessary devices relating to the specific measurement method, case by case, and to carefully explain the obtained results, in the light of the peculiarities and the limits of each situation. Finally, the results of similar statistical analysis carried out on a greater number of ks values, measured through the (TI) and (PI) methods are shown in this paper, with some statistical considerations on the increasing of the measurements number.

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