Two-modality laser diode interferometer for high-accuracy measurement of long-range absolute distance

2010 ◽  
Author(s):  
Bofan Wang ◽  
Zhongliang Li ◽  
Xiangzhao Wang ◽  
Peng Bu
Keyword(s):  
Long Range ◽  
Laser Diode ◽  
High Accuracy ◽  
Absolute Distance ◽  
Accuracy Measurement ◽  
High Accuracy Measurement

High-accuracy measurement of radius using frequency-modulated technique for laser diode

2020 ◽  
Vol 34 (22n24) ◽  
pp. 2040131
Author(s):  
Thanh Tung Vu ◽  
Cong Tuan Truong ◽  
Toan Thang Vu ◽  
Hong Hai Hoang
Keyword(s):  
High Precision ◽  
Laser Diode ◽  
Frequency Modulation ◽  
Optical Axis ◽  
Michelson Interferometer ◽  
Zero Point ◽  
High Accuracy ◽  
Synchronous Detection ◽  
Accuracy Measurement ◽  
High Accuracy Measurement

This paper proposes a method for high-precision radius measurements. The proposed system uses a frequency-modulation technique to improve the accuracy of detecting cat’s eye and the confocal position of a lens. The distance between two points defined as the radius of a lens was measured by using a frequency-modulated Michelson interferometer. In the confocal part, when the tested lens was moved along the optical axis, the intensity at the detector reaches a maximum at the confocal and cat’s eye positions of the sphere. Synchronous detection technique is used to turn the intensity signal from the detector into an odd-symmetry signal through a zero point. These symmetry points coincide with cat’s eye and confocal positions and thus enhance the accuracy with which these two points are detected. A frequency-modulated Michelson interferometer is used to accurately measure the displacement when moving the test sphere between the confocal and cat’s eye points.

High accuracy measurement of the ground-state hyperfine splitting in a 113Cd+ microwave clock: erratum

2021 ◽  
Vol 46 (20) ◽  
pp. 5207
Author(s):  
K. Miao ◽  
J. W. Zhang ◽  
X. L. Sun ◽  
S. G. Wang ◽  
A. M. Zhang ◽  
...  
Keyword(s):  
Ground State ◽  
Hyperfine Splitting ◽  
High Accuracy ◽  
Accuracy Measurement ◽  
High Accuracy Measurement

scholarly journals High Accuracy Measurement of Total Losses in Fractional Horsepower Induction Motors

2015 ◽  
Vol 1 (2) ◽  
pp. 13
Author(s):  
Azzeddine Ferrah ◽  
Mounir Bouzguenda ◽  
Jehad M. Al-Khalaf Bani Younis
Keyword(s):  
Single Phase ◽  
Induction Motors ◽  
Data Acquisition System ◽  
High Accuracy ◽  
Industrial Applications ◽  
Motor Speed ◽  
Accuracy Measurement ◽  
Three Phase ◽  
Better Than ◽  
High Accuracy Measurement

Large and small single-phase and three-phase induction motors are commonly used in industrial applications. The present work represents an attempt towards the design of a high accuracy system for the measurement of fractional horsepower (FHP) induction motor losses and efficiency. The calorimeter designed and built is capable of measuring heat losses of up to 1 kW with an overall accuracy better than 3%. During all tests, ambient temperature, humidity, motor speed and motor frame temperature were recorded using precise digital instruments. The inlet, outlet temperatures and resulting losses were recorded automatically using a high accuracy 12-bit data acquisition system. The preliminary results obtained demonstrate the suitability of the designed calorimeter for the accurate measurement of losses in FHP induction motors.

High accuracy measurement model of laser triangulation method

2018 ◽  
Vol 47 (9) ◽  
pp. 906008
Author(s):  
孙兴伟 Sun Xingwei ◽  
于欣玉 Yu Xinyu ◽  
董祉序 Dong Zhixu ◽  
杨赫然 Yang Heran
Keyword(s):  
Measurement Model ◽  
High Accuracy ◽  
Laser Triangulation ◽  
Accuracy Measurement ◽  
Triangulation Method ◽  
High Accuracy Measurement ◽  
Laser Triangulation Method
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