The bluff body attaches to an elastic mount and is capable of generate vortex shedding when the elastic mount orients the bluff body in a flow-line traverse to a fluid flow and vibrates in response to the vortex shedding. A harvester is located within the bluff body and is capable of generating power above a specified threshold in response to the vibration.

The bluff body attaches to an elastic mount and is capable of generate vortex shedding when the elastic mount orients the bluff body in a flow-line traverse to a fluid flow and vibrates in response to the vortex shedding. A harvester is located within the bluff body and is capable of generating power above a specified threshold in response to the vibration.

According to one embodiment, a sensor includes a supporter, a film portion, a first element, and a first magnetic portion. The supporter includes a first support portion and a second support portion. The film portion includes a first partial region supported by the first support portion. The first element is provided at the first partial region. The first element includes a first electrode region, a first opposing electrode region, and a first magnetic layer provided between the first electrode region and the first opposing electrode region. A direction from the second support portion toward the first magnetic portion is aligned with a first direction. The first direction is from the first opposing electrode region toward the first electrode region. At least a portion of the first magnetic portion overlaps at least a portion of the first element in a direction crossing the first direction.

Provided is a power generator 1. The power generator includes two magnetostrictive rods 2 arranged side by side and formed on a magnetostrictive material, coils 3 respectively wound around the magnetostrictive rods 2 and a beam member 73 having a function of generating stress in the two magnetostrictive rods 2. The power generator 1 is configured so that elastic energy stored in the beam member 73 is larger than elastic energy stored in each of the magnetostrictive rods 2 when tip end portions of the two magnetostrictive rods 2 and the beam member 73 are displaced with respect to base end portions of the two magnetostrictive rods 2 and the beam member 73 to deform the two magnetostrictive rods 2 and the beam member 73.

A power generation element includes a magnetostrictive plate, a coil enclosing at least a part of the magnetostrictive plate, a magnetic field generation portion that generates a magnetic field, a yoke including a ferromagnetic body, and a non-magnetic body. The magnetostrictive plate contains a magnetostrictive material and has one fixed end. The power generation element generates power when force is applied to the magnetostrictive plate. The yoke spans from one towards another partial area of the magnetostrictive plate. The one partial area of the magnetostrictive plate, the non-magnetic body, and one end of the yoke at the one partial area of the magnetostrictive plate are disposed in this order. Another end of the yoke faces the other partial area through a gap. The one partial area is on one surface of the magnetostrictive plate and the magnetic field generation portion is provided on another surface of the magnetostrictive plate.

A microwave resonator magnetic field measuring device (1) for measuring alternating magnetic fields, with a base plate (11) having at least one supporting/bearing/clamping point (111), at least one mechanical oscillator (12+13) formed as a microwave resonator in the form of a cantilever (13) having at least one magnetostrictive layer (12), the latter being connected and mounted at at least one point to the base plate (11) in the at least one supporting/bearing/clamping point (111), at least one input coupling means (161) for microwaves and at least one output coupling means (162) for microwaves, wherein the base plate (11) and the mechanical oscillator (12+13) formed as a microwave resonator are at least partly electrically conductive and electrically conductively connected to one another. Also, a magnetic field measuring method having a magnetic field measuring device according to the invention.

A magnetostrictive sensor including a magnetic structure. The magnetic structure has a columnar substrate extending along an axis, and a magnetostrictive portion disposed on an outer peripheral surface of the substrate. The magnetostrictive portion includes a plurality of portions that have different concentrations of at least one of a plurality of elements, the portions being so arranged as to satisfy at least one of a first requirement that in a first cross sectional view of the magnetostrictive portion orthogonal to the axis, the portions are arranged clockwise about the axis, a second requirement that in the first cross sectional view, the portions are arranged in a thickness direction of the magnetostrictive portion, and a third requirement that, in a second cross sectional view of the magnetostrictive portion that is orthogonal to the first cross sectional view and passes through the axis, the portions are arranged along the axis.

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.

A vibration powered generator capable of vibrating at a plurality of resonance frequencies to generate electric power with a simpler structure is provided. A vibration powered generator has an elongated magnetostrictive material having one end attached to a vibrating body, in which the magnetostrictive material vibrates due to vibration of the vibrating body whereby the vibration powered generator generates electric power with the aid of an inverse magnetostrictive effect of the magnetostrictive material. A cross-sectional shape vertical to a longitudinal direction of the magnetostrictive material has an asymmetrical shape with respect to a straight line extending along a vibration direction thereof due to vibration of the vibrating body.

A sensor for sensing stress in a ferromagnetic material includes a non-magnetic substrate. The substrate has a first surface and a second surface opposite the first surface. A first coil is attached to or formed on the first surface of the substrate. The first coil is configured to induce a magnetic flux in the ferromagnetic material being driven by an alternating current (AC) signal. At least one second coil is attached to or formed on the first surface of the substrate. The at least one second coil is spaced from the first coil. In addition, the second coil is configured to detect changes in the magnetic flux induced in the ferromagnetic material.