A magnetic field sensor element 1 includes a light emitter 10 emitting a first linearly polarized light, a first optical element 20 emitting a first linearly polarized wave and the second linearly polarized wave in response to a first linearly polarized light incident, and emitting a second linearly polarized light in response to a third linearly polarized wave and the a linearly polarized wave incident, at least one pair of magnetic field sensor elements 50 capable of disposing in a predetermined magnetic field across the measured conductor, having a light transmissive, changing the phase of transmitted light in accordance with the magnetic field, and fixing a relative position therebetween, an optical path 30 including a first optical path propagating the first linearly polarized wave and the fourth linearly polarized wave, and a second optical path propagating the second linearly polarized wave and the third linearly polarized wave, and connected to the first optical element and the magnetic field sensor element, a detected signal generator 60 outputting a detected signal corresponding to the magnetic field, by receiving two components of the second linearly polarized light, and converting to the electrical signal, and an optical branching element transmitting the first linearly polarized light to the first optical element and branching the second linearly polarized light to the detected signal generator.

An electric monitoring optical fiber package for an electrical monitoring sensing system is described, the system is used for monitoring and adjusting the electric or magnetic properties of an electric system or cable. The optical fiber package comprises at least one optical fiber, a portion of the optical fiber being coated with a coating material selected from the range of; electrostrictive material, magnetostrictive material, polarisation sensitive material, piezo-electric material; wherein the coating material is a polymeric material. The coated portion of the optical fiber is arranged to provide at least one sensing portion; the sensing portion comprising a sensing portion diameter. The invention aims to provide a low-cost, simpler electrical monitoring sensing system capable of sensing disturbances and anomalies in an adjacent electric system or cable.

The disclosure relates to a method for measuring a current using a diamond material. The diamond material has at least one nitrogen deposit and an imperfection in a crystal lattice of the diamond material, adjacent to the nitrogen deposit. The method comprises a providing step, a detecting step and an evaluating step. In the providing step, electromagnetic waves are provided to excite the diamond material. In the evaluating step, an intensity of a fluorescence of the diamond material is detected. In the evaluating step, the intensity and a frequency of the electromagnetic waves are evaluated in order to determine a magnetic field strength influencing the fluorescence.

There is described an optical fiber current sensor having an opto-electronic module part for detecting an optical phase shift induced by the measurand field in a sensing fiber, a sensor head including the sensing fiber, wherein the sensing fiber is a spun highly-birefringent fiber having a length L= ds defined by the line integral along the space curve given by the sensing fiber coil such that the length L of the sensing fiber is sufficiently long to suppress thermal signal instabilities due to the spun character of the sensing fiber while the effective number of fiber windings is low enough to maintain a maximum sensitivity over the full measurement range of the fiber-optical sensor.

There is provided a system for use with a fiber-optic current transducer. The system includes a processing unit configured to transduce a first light signal into a first electrical signal. The processing unit is further configured to transduce a second light signal into a second electrical signal. Furthermore, the processing unit is configured to remove offsets from the first electrical signal and the second electrical signal by forcing the first electrical signal and the second electrical signal to be on the same per unit basis.

An optical voltage sensor assembly includes an input fiber-optic collimator positioned and configured to collimate input light beam from a light source. A crystal material is positioned to receive the input light beam from the light source and configured to exhibit the Pockels effect when an electric field is applied through the crystal material. An output fiber-optic collimator is positioned to receive an output light beam from the crystal material and configured to focus the output light beam from the crystal onto a detector. Methods of using the optical voltage sensor assembly are also disclosed.

A method for monitoring a semiconductor element in a semiconductor module, wherein the semiconductor module has feed lines contacting the semiconductor element, includes arranging a magneto-optical sensor in a region of the semiconductor element or of at least one of the feed lines, reflecting a polarized light signal from the magneto-optical sensor or transmitting a polarized light signal through the magneto-optical sensor, and determining a current from a polarization of the reflected or transmitted light signal.

The invention relates to a spliced optical fiber comprising a first and second polarization-maintaining optical fiber connected at ends by splicing; to fiber optic current sensors; and to a method for protecting the spliced optical fiber against mechanical stress and/or humidity. A protection tube is arranged around the spliced optical fiber in a splice section of the spliced optical fiber. A first and second end of the protection tube is sealed to the spliced optical fiber by first and second sealing arrangement for protecting the splice.

The invention relates to a spliced optical fiber comprising a first and second polarization-maintaining optical fiber connected at ends by splicing; to fiber optic current sensors; and to a method for protecting the spliced optical fiber against mechanical stress and/or humidity. A protection tube is arranged around the spliced optical fiber in a splice section of the spliced optical fiber. A first and second end of the protection tube is sealed to the spliced optical fiber by first and second sealing arrangement for protecting the splice.

A system for measuring a current intensity of a current flowing through an electrical conductor (10), where the system includes a first component (1), which has the electrical conductor (10), and a second component (2), which is separate from the first component (1) and has an evaluation device (23), and a magnetic field-sensitive sensor element (3) and a connection line (4). The connection line (4) is a light guide. The sensor element (3) is non-releasably connected to the first end of the connection line (4) and/or to the first component (1). In the operating state, the two components 1(, 2) are DC-isolated from one another and are releasably connected to one another by means of the connection line (4) by way of a light-guiding connection, where the power supply to the magnetic field-sensitive sensor element (3) by the second component (2) and/or transmission of sensor data from the magnetic field-sensitive sensor element (3) to the evaluation device (23) is ensured by the light-guiding connection.