Study on temperature effect of BOTDR-based optical fibers

Conventional methods for the online monitoring of icing conditions of composite insulators suffer from difficulties. To solve this issue, a novel method is first proposed to detect glaze icing load via embedding three optical fibers with fiber Bragg gratings (FBGs) into a 10 kV composite insulator. Specifically, FBG temperature compensation sensors were packaged in ceramic tubes to solve strain and temperature cross-sensitivity. Temperature effect experiments and simulated glaze icing load experiments were performed to verify the feasibility of the proposed method. The results show that temperature sensitivities of all FBGs are identical (i.e., 10.68 pm/°C), which achieves a simultaneous measurement of temperature and strain. In addition, the proposed method can detect glaze icing load of the composite insulator above 0.5 N (i.e., 15% of icicle bridged degree) in the laboratory.

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Supercontinuum Generation in Optical Fibers

10.1017/cbo9780511750465 ◽

2009 ◽

Cited By ~ 262

Keyword(s):

Optical Fibers ◽

Supercontinuum Generation

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Temperature effect on friction coefficient in stamping of coated stelle sheets

Matériaux & Techniques ◽

10.1051/mattech/199381010088 ◽

1993 ◽

Vol 81 (1-2-3) ◽

pp. 88-92

Author(s):

Y. Renault

Keyword(s):

Friction Coefficient ◽

Temperature Effect

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

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-2-38-44 ◽

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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