Factors affecting phase measurement accuracy in acousto-optic phase processor

2001 ◽  
Author(s):  
Mieczyslaw Szustakowski ◽  
Leon Jodlowski ◽  
Robert Bobrowicz
Keyword(s):  
Measurement Accuracy ◽  
Phase Measurement ◽  
Factors Affecting

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.

Phase measurement accuracy in noise waveform synthetic aperture radar

2015 ◽  
Vol 51 (4) ◽  
pp. 3364-3373 ◽  
Author(s):  
Kostyantyn A. Lukin ◽  
Pavlo L. Vyplavin ◽  
Vladimir P. Palamarchuk ◽  
Volodymyr V. Kudriashov ◽  
Krzysztof Kulpa ◽  
...  
Keyword(s):  
Synthetic Aperture Radar ◽  
Measurement Accuracy ◽  
Phase Measurement ◽  
Synthetic Aperture ◽  
Aperture Radar

An Investigation of Various Factors Affecting Measurement Accuracy of the Tekscan Seat Pressure System

1996 ◽  
Vol 40 (20) ◽  
pp. 1036-1040 ◽  
Author(s):  
Hongzheng Lu ◽  
Gang Lin
Keyword(s):  
Measurement Error ◽  
Contact Area ◽  
Contact Time ◽  
Measurement Accuracy ◽  
Time Interval ◽  
Pressure System ◽  
Factors Affecting ◽  
Measurement Results ◽  
Accuracy Of Measurement ◽  
Pressure Measurement System

This study investigated the following factors affecting the measurement accuracy of the seat pressure measurement system made by TekScan, Inc.: (a) contact time; (b) contact area; (c) the amount of force applied on the pressure mat at the time of calibration and at measurement; and (d) the consistency of contact time before calibration and measurement, and the time interval between calibration and measurement. Results show that the above factors significantly affect the accuracy of measurement. The measurement error can be limited by controlling the contact time for both calibration and measurement to 2 minutes, and controlling the contact area and applied force equally at calibration and measurement.

Evaluation of Measurement Uncertainty for Water Content Tests in Soil Samples

2013 ◽  
Vol 718-720 ◽  
pp. 984-988
Author(s):  
Zhi Qing Gao ◽  
Nai Qi Shen ◽  
Xu Li ◽  
Zong Yun Shu
Keyword(s):  
Measurement Uncertainty ◽  
Water Content ◽  
Measurement Accuracy ◽  
Soil Samples ◽  
Uncertainty Of Measurement ◽  
Expanded Uncertainty ◽  
Factors Affecting ◽  
Testing Conditions ◽  
Content Determination ◽  
Measurement Results

Measurement uncertainty in the water content test for soil samples is an index for evaluating the reliability of the experiment. It affects the accuracy of some parameters such as porosity and saturation, which are derived from water content. According to the requirements of the standard JJF 1059-1999 Uncertainty Evaluation and Denotation of the Measurement Results, the uncertainty for the measurement results of the water content in soil samples was evaluated. Concerning the characteristics of the water content determination in soil samples, a pail of soil sample was taken as specimen due to its relative homogeneity. The factors affecting the measurement accuracy were discussed. The result shows that the expanded uncertainty of measurement results of the water content in soil samples was 1.6% under the proposed testing conditions.

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