An Algorithm to Eliminate Stochastic Jump Measurements of Ultrasonic Flow-Meter with Time Difference Method

2011 ◽  
Vol 267 ◽  
pp. 414-421
Author(s):  
Qiang Liu ◽  
Rang Ding Wang ◽  
Ying Zhu ◽  
Cheng Tou Du
Keyword(s):  
Measurement Accuracy ◽  
Time Difference ◽  
Test Results ◽  
Flow Meter ◽  
Newton Interpolation ◽  
Improve Measurement ◽  
Measurement Results ◽  
Stochastic Jump ◽  
Ultrasonic Flow Meter ◽  
Measurement Principle

This article describes the time difference ultrasonic flow meter measurement principle, by analyzing the ultrasonic flow meter test results, using the theory of Newton interpolation correction calibration constants, solves the problems that the measurement results will suddenly appear more random beating and further improve measurement accuracy of the ultrasonic flow meter.

iGPS Measurement Network Multi-Station Arrangement Design

2013 ◽  
Vol 443 ◽  
pp. 223-227 ◽  
Author(s):  
Na Zhou ◽  
Zhi Yong An ◽  
Li Juan Li ◽  
Yun Zhu
Keyword(s):  
Measurement Accuracy ◽  
Measurement Unit ◽  
Baseline Length ◽  
Position Tracking ◽  
Test Results ◽  
Simulation Design ◽  
Intersection Angle ◽  
Optimal Arrangement ◽  
Accuracy Requirement ◽  
Measurement Principle

In order to meet the measurement accuracy requirement of some patrol device iGPS position tracking experiment, the most rational, economic configuration and optimal arrangement of iGPS are needed to find. It presented the iGPS dual-transmitter measurement principle based on non-coplanar intersection principle, and also their uncertainty analysis. From the measurement unit of iGPS networkthe dual-transmitter measurement uncertainty simulation results, the relations between measurement accuracy and the intersection angle, azimuth angle, pitch angle and baseline length are studied, which provides a reference for arrangement of multi-transmitter of iGPS. The iGPS multi-transmitter arrangement simulation design of some patrol device iGPS position tracking experiment is put forward. The calibration test results show that: the measurement accuracy of station arrangement design is less than 0.4mm, and satisfied the experiment requirement.

scholarly journals COMPARISON OF ULTRASONIC PULSE VELOCITY TEST RESULTS WITH AND WITHOUT USING TRANSDUCER STABILIZER

2020 ◽  
Vol 25 (1) ◽  
pp. 12
Author(s):  
Fajar Surya Herlambang ◽  
Evin Yudhi Setyono
Keyword(s):  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Test Results ◽  
Data Collection Process ◽  
Improve Measurement ◽  
Accuracy Of Measurements ◽  
Measurement Results ◽  
Test Position ◽  
The Stability

Some research on the Ultrasonic Pulse Velocity (UPV) test has not covered much about the problems encountered during the data collection process. Based on experience using UPV test equipment, it is known that instability occurs in reading the test results. This is caused by the inability of the operator, in maintaining the stability of the transducer both in its position and pressure, especially in the measurement with the overhead position. Therefore, in this study a tool was made to make the transducer stable in the test position. Comparison of measurement results shows that, the uncertainty of wave velocity measurement decreases from the range of 4% -17% to 0.2% -0.4%. Meanwhile, the uncertainty of measurement of wave travel time decreased from the range of 0.8% -14% to 0.1% -0.4%. This can be interpreted that, the level of accuracy of measurements using a transducer stabilizer is 99.6% -99.9%. Thus, the use of transducer stabilizers is believed to be able to improve measurement accuracy.

Laser Diode Self-Mixing Interference Based on Phase Measurement Method

2008 ◽  
Vol 381-382 ◽  
pp. 247-250
Author(s):  
Ming Wang ◽  
Dong Mei Guo
Keyword(s):  
Laser Diode ◽  
Phase Modulation ◽  
Signal Analysis ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Phase Measurement ◽  
External Cavity ◽  
Experimental System ◽  
Measurement Results ◽  
Measurement Principle

In order to improve the displacement measurement accuracy of the laser diode self-mixing interference (SMI), phase measurement method is introduced in the SMI signal analysis. In this paper, three modulation technique have been proposed: injection current modulation, external cavity length modulation and sinusoidal phase modulation. Measurement principle of the three modulation techinque are briefly explained. Design of the experimental system, measurement results of micro-displacement will be reported.

Subpixel Edge Detection for Segmentation of the Pulp Fiber Image

2014 ◽  
Vol 568-570 ◽  
pp. 696-700
Author(s):  
Hong Juan Shi ◽  
Kai Li Zhang ◽  
Qing Hua Li
Keyword(s):  
Edge Detection ◽  
Measurement Accuracy ◽  
Ccd Camera ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Edge Point ◽  
Canny Operator ◽  
Improve Measurement ◽  
Measurement Results ◽  
Edge Detection Method

In this paper the problem of accurate edge detection for pulp fibers images is discussed. The images are acquired by the smart CCD camera. Subpixel edge detection is considered that applied in the system to improve the measurement accuracy of pulp fibers. The location of a precise edge is the basis of kink index, kink Angle, curl index and other measurement parameters for the pulp fibers. A new method for subpixel edge detection of the pulp fibers is introduced. Canny operator is used to get the pixel level edge. Each edge point determines five pixels in the gradient direction. Then the least squares fitting is used to locate its sub-pixel edge. The measurement results show that the proposed subpixel edge detection method is valid to improve measurement accuracy for real time measuring the pulp fiber parameters.

An Effective Thermal Flow Meter Based on TDC-GP1 Chip

2012 ◽  
Vol 499 ◽  
pp. 409-413
Author(s):  
Jing Hou ◽  
Wan Jiang Zhang ◽  
Yan Ling Sun
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Flow Measurement ◽  
Time Difference ◽  
Low Power Consumption ◽  
Thermal Flow ◽  
Time Intervals ◽  
Flow Meter ◽  
Difference Type ◽  
Ultrasonic Flow Meter

In this paper, an effective and innovative thermal flow meter is presented. It is based on TDC-GP1 chip and the principle of time difference type ultrasonic flow measurement. Ultrasonic flow meter is applied widely and has some advantages such as non-contact, easily installed and maintained. But it is necessary to make the meter work more stable. The method of time difference can improve the stabilization and measured precision of the ultrasonic flow meter. TDC-GP1 is a chip which can transform time intervals into digital values with high precision. The design of the ultrasonic thermal flow meter is given details in the paper. Results of the experiments show that the innovative meter has low power consumption and high measured precision.

A Novel Method of Establishing “Datum Reference” for the Coaxiality Measurements Using the Multi-Section and Multi-Probe Gauges

2011 ◽  
Vol 317-319 ◽  
pp. 1759-1768 ◽  
Author(s):  
Lian Hu Xu ◽  
Yi Bao Yuan ◽  
Wei Ying Piao
Keyword(s):  
Mathematical Method ◽  
Measurement Accuracy ◽  
Coordinate Measuring Machine ◽  
Measurement Results ◽  
Manufacturing Errors ◽  
High Measurement ◽  
Measurement Principle ◽  
Manufacturing Accuracy ◽  
Measuring Machine ◽  
Measurement Efficiency

The electronic or pneumatic multi-section and multi-probe gauges are widely used for diameter and coaxiality measurements due to their high measurement efficiency in workshops. However, their measurement accuracy is determined mainly by the manufacturing errors of the assembly coaxiality master, therefore, how to establish coaxiality measurement datum reference is the key technology. The physical coaxiality masters are expected to be the impossible "zero error datum reference". The higher manufacturing accuracy of the masters, the more expensive for their manufacturing costs. A novel mathematical method on the basis of error separation principle was proposed in order to separate the manufacturing errors of the master. The basic principle is that the eccentric error of the coaxiality master can be expressed as the first harmonic function and the ideal zero-error datum reference could be established by the mathematical method of two sampling operations in phase difference of 180° in coaxiality master for gauge initialization. This method can be called as "mathematical datum reference" for coaxiality measurement. Experimental results indicate that the coaxiality measurement results of the multi-section and multi-probe gauge by the novel mathematical method coincide with those of the three-coordinate measuring machine and the maximum difference of both is about 0.0014 mm. The new coaxiality measurement principle can separate the datum error of the coaxiality master theoretically and can improve the coaxiality measurement accuracy greatly with the common accuracy coaxiality master.

scholarly journals Effectiveness of Variable-Gain Kalman Filter Based on Angle Error Calculated from Acceleration Signals in Lower Limb Angle Measurement with Inertial Sensors

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Yuta Teruyama ◽  
Takashi Watanabe
Keyword(s):  
Kalman Filter ◽  
Lower Limb ◽  
Measurement Accuracy ◽  
Inertial Sensors ◽  
Angle Measurement ◽  
Angle Error ◽  
Variable Gain ◽  
Improve Measurement ◽  
Kalman Gain ◽  
Acceleration Signals

The wearable sensor system developed by our group, which measured lower limb angles using Kalman-filtering-based method, was suggested to be useful in evaluation of gait function for rehabilitation support. However, it was expected to reduce variations of measurement errors. In this paper, a variable-Kalman-gain method based on angle error that was calculated from acceleration signals was proposed to improve measurement accuracy. The proposed method was tested comparing to fixed-gain Kalman filter and a variable-Kalman-gain method that was based on acceleration magnitude used in previous studies. First, in angle measurement in treadmill walking, the proposed method measured lower limb angles with the highest measurement accuracy and improved significantly foot inclination angle measurement, while it improved slightly shank and thigh inclination angles. The variable-gain method based on acceleration magnitude was not effective for our Kalman filter system. Then, in angle measurement of a rigid body model, it was shown that the proposed method had measurement accuracy similar to or higher than results seen in other studies that used markers of camera-based motion measurement system fixing on a rigid plate together with a sensor or on the sensor directly. The proposed method was found to be effective in angle measurement with inertial sensors.

Launching of Ships and Floating Structures from Horizontal Berth by Tipping Table

1998 ◽  
Vol 14 (04) ◽  
pp. 265-276
Author(s):  
Ivo Senjanovic
Keyword(s):  
Structural Dynamics ◽  
Review Paper ◽  
Offshore Structures ◽  
Model Tests ◽  
Full Scale ◽  
Strength Analysis ◽  
Test Results ◽  
Floating Structures ◽  
Measurement Results

This review paper covers extensive investigations which were undertaken in order to verify the idea of launching of ships and other floating structures from a horizontal berth by a set of turning pads. This includes structural dynamics during launching, model tests and strength analysis of the structure and the launching system. The most important results, which were used for the design of the launching system, are presented. The preparation of a barge for side launching is described, and the full-scale measurement results are compared with the test results. The advantages of building ships and offshore structures on a horizontal berth are pointed out in the conclusion.

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