A Very Accurate X-Band Rotary Attenuator with an Absolute Digital Angular Measuring System

1972 ◽  
Vol 21 (4) ◽  
pp. 446-450 ◽  
Author(s):  
Frank L. Warner ◽  
Donald O. Watton ◽  
Peter Herman
Keyword(s):  
Measuring System ◽  
X Band ◽  
Angular Measuring

X-band ground-based radiometer-scatterometer measuring system

1998 ◽  
Author(s):  
Chuanliang Yao ◽  
Yinlong Zhao ◽  
Jun Zhang ◽  
Zhen-he Fang
Keyword(s):  
Measuring System ◽  
Title X ◽  
X Band

Read－head design for improving the precision of circular grating angular measuring system

2014 ◽  
Vol 27 (7) ◽  
pp. 653-657 ◽  
Author(s):  
Dongfeng Su ◽  
Zhijun Xu ◽  
Jiqiang Jia ◽  
Bo Liu ◽  
Dawei Li
Keyword(s):  
Measuring System ◽  
Read Head ◽  
Angular Measuring ◽  
Circular Grating

Calibration of Invar Angular Interferometer Optics with Multi-Step Method

2015 ◽  
Vol 9 (5) ◽  
pp. 502-507
Author(s):  
Zi Xue ◽  
◽  
Yao Huang ◽  
Heyan Wang ◽  
Hu Lin
Keyword(s):  
Measurement Uncertainty ◽  
Primary Standard ◽  
Measuring System ◽  
Rotary Table ◽  
Plane Angle ◽  
Step Method ◽  
Measuring Range ◽  
System A ◽  
Angle Measuring ◽  
Angular Measuring

At the National Institute of Metrology (NIM), China, the Small Angle Measuring System, which is based on the sine principle, was developed as the national primary standard for the plane angle in an angular measuring range of ±5°. The measurement uncertainty of this system is dominated by the accuracy of an invar angular interferometer optical system. To calibrate this angle interferometer system, a series of known reference standards were generated with a multi-step method using a double-deck rotary table. The measurement uncertainty of the calibration is estimated to be approximately 0.05'' (k=2).

High-voltage monitoring by the fiber-optic recirculating measuring system

2020 ◽  
pp. 38-44
Author(s):  
A. V. Polyakov ◽  
M. A. Ksenofontov
Keyword(s):  
Optical Fibers ◽  
High Voltage ◽  
Optical Sensors ◽  
Electromagnetic Interference ◽  
Fiber Optic ◽  
Electric Power Industry ◽  
Measuring System ◽  
Voltage Range ◽  
External Electromagnetic Fields ◽  
Optic Communication

Optical technologies for measuring electrical quantities attract great attention due to their unique properties and significant advantages over other technologies used in high-voltage electric power industry: the use of optical fibers ensures high stability of measuring equipment to electromagnetic interference and galvanic isolation of high-voltage sensors; external electromagnetic fields do not influence the data transmitted from optical sensors via fiber-optic communication lines; problems associated with ground loops are eliminated, there are no side electromagnetic radiation and crosstalk between the channels. The structure and operation principle of a quasi-distributed fiber-optic high-voltage monitoring system is presented. The sensitive element is a combination of a piezo-ceramic tube with an optical fiber wound around it. The device uses reverse transverse piezoelectric effect. The measurement principle is based on recording the change in the recirculation frequency under the applied voltage influence. When the measuring sections are arranged in ascending order of the measured effective voltages relative to the receiving-transmitting unit, a relative resolution of 0,3–0,45 % is achieved for the PZT-5H and 0,8–1,2 % for the PZT-4 in the voltage range 20–150 kV.

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