267 results about "Magnetic imaging" patented technology

An electromagnetic imaging apparatus and method for electromagnetically measuring physical parameters of a pipe CJ, CC by means of a plurality of measuring arrangement ZMA, MCMA, MonMa, ImMA comprising a plurality of transmitter coil ZTX, LFTX, DTX and a plurality of receiver coil ZRX1, ZR2, MRX, MC, PRX1, PRX2, PRX3, PRX4, PRX5, PRX6, PRX7, PRX8, PRX9, PRX10, PRX11, PRX12, PRX13, PRX14, PRX15, PRX16, PRX17, PRX18, the transmitter coils and receiver coils being associated so as to form the plurality of measuring arrangement, the plurality of measuring arrangement being adapted to be positioned into the pipe and displaced through the pipe, the physical parameters being measured for a plurality of position along the pipe.

The invention discloses a magnetic resistance Z-axis gradient sensor chip which is used for detecting the gradients of components of a Z-axis magnetic field generated by magnetic media in the X-Y plane so as to conduct magnetic imaging on the magnetic media. The magnetic resistance Z-axis gradient sensor chip comprises a Si substrate, two or two groups of sets containing a plurality of flux leaders and magnetic resistance sensing units which are electrically connected, wherein the distance between the sets is Lg. The magnetic resistance sensing units are located on the Si substrate and located above or below the edges of the flux leaders, the components of the Z-axis magnetic field are converted into the mode that the components of the Z-axis magnetic field are parallel to the surface of the Si substrate and in the direction of the sensitive axes of the magnetic resistance sensing units, and the magnetic resistance sensing units are electrically connected into a half-bridge or whole-bridge gradient meter, wherein the distance between opposite bridge arms is Lg. The sensor chip can be used together with a PCB, a PCB and back magnetor a PBC and back magnet and packaging shell. According to the magnetic resistance Z-axis gradient sensor chip, measurement of the Z-axis magnetic field gradient is achieved by using plane sensitive magnetic resistance sensors, and the magnetic resistance Z-axis gradient sensor chip has the advantages of being small in size and low in power consumption, having higher magnetic field sensitivity than a Hall sensor and the like.

Examples of the present invention include metamaterial lenses that allow enhanced resolution imaging, for example in MRI apparatus. An example metamaterial may be configured to have μ=−1 along three orthogonal axes. Superior performance was demonstrated using such improved designs, and in some examples, imaging resolution better than λ / 500 was obtained. The use of one or more lumped reactive elements in a unit cell, such as one or more lumped capacitors and / or one or more lumped inductors, allowed unit cell dimensions and hence resolution to be dramatically enhanced. In some examples, a cubic unit cell was used with an essentially isotropic magnetic permeability of μ=−1 obtained at an operating electromagnetic frequency and wavelength (λ).