Optical Fibre Magnetic Field Sensors for Monitoring οf the State of Work of Electric Motors

Abstract

The present paper deals with investigations concerning optical magnetic sensors. The most important advantage of sensors of this kind is their safety of service and insulating power. The insensitiveness of optical sensors to electromagnetic interference was discussed and experimentally investigated. The experimental investigations were concentrated on the adequate sensing fibre as well as on the sensor based on the bulk glass cylinder. The paper presents the results of magnetooptic tests of the elaborated magnetic field optical sensors and conclusions arise from them.

Optical fibre current sensor for electrical power engineering

“…At the Department of Optoelectronics at SUT for more than ten years investigations have been under way concerning magnetooptically sensitive waveguides [9][10][11][12][13][14][15][16][17][18][19]. For two years already investigations have been run concerning socalled volumetric optoelectronic sensors of the magnetic field with optical fibre inputs [16].…”

Nd3+/Yb3+Doped Phosphate and Antimony Glasses for Optical Fibre Source

“…The obtained fluorophosphates matrix doped with the Nd 3+ /Yb 3+ ion system is characterised by a high spontaneous emission of the 4 F 3/2 → 4 I 11/2 transition corresponding to the wavelength of 1064 nm, therefore it can be successfully applied in high-power lasers and ASE sources. The high efficiency of energy transfer and the low level of lattice vibrations obtained in antimony glasses doped with 0.15%molNd 2 O 3 : 0.45%molYb 2 O 3 determine their application in up conversion systems [19][20][21] or the Raman lasers. It follows from the conducted analyses that the produced glasses described above can be used for constructing active optical fibres.…”

“…Because of a small difference in energy (≈ 1190 cm −1 ) between the laser levels of neodymium and ytterbium it is possible to obtain a resonant interaction between the 4 F 3/2 excited level for neodymium and the 2 F 5/2 level for ytterbium. Electrostatic interactions between ions described in the work of Forster and Dexter [19,20] can be determined by energy transfer rate [2]:…”

Spectropolarimetric analyses of optical single mode SU8 waveguide layers

“…Although some optical sensors have been used in niche markets to measure various physical parameters (e.g. the measurement of the electric field at power stations [4,5], monitoring the artificial heart [6]), their highest potential (both physically and economically) permits to measure very low concentrations of biochemical and chemical components [7]. Almost always the reading system works on the following principle: a change of the measured parameter is converted to a change of the properties of the optical beam in the measurement system, leading to changes in the intensity of light recorded by the detector.…”