Abstract: The present invention relates to current measurement apparatus 100. The current measurement apparatus 100 comprises a measurement arrangement 110, 114 which is configured to be disposed in relation to a load 108 which draws a current signal, the measurement arrangement being operative when so disposed to measure the load drawn current signal. The current measurement apparatus 100 also comprises a signal source 112 which is operative to apply a reference input signal to the measurement arrangement 110, 114 whereby an output signal from the measurement arrangement comprises a load output signal corresponding to the load drawn current signal and a reference output signal corresponding to the reference input signal.

Abstract: A low-cost and high-precision current sensing device and methods for use and manufacturing. In one embodiment, the current sensing apparatus comprises a Rogowski-type coil which is manufactured in segments so as to facilitate the manufacturing process. In an exemplary embodiment, the current sensing apparatus segments are asymmetric in shape and/or composition (e.g., bobbin shape, size, and/or winding configuration) so as to account for asymmetries in the magnetic field distribution around a bus bar, or to accommodate its shape in a more compact form factor, and/or to improve the immunity to the effects of an external magnetic field. Methods of manufacturing and using the aforementioned current sensing apparatus are also disclosed.

Abstract: 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. 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. Furthermore, the processing unit is configured to combine the first electrical signal and the second electrical signal to produce a composite signal, the composite signal being free of the offsets. And the processing unit is further configured to linearize the composite signal to produce an output current indicative of a current flowing in a conductor disposed proximate the FOCT.

Abstract: Systems and methods according to these exemplary embodiments provide for methods and systems related to optical current sensors used to monitor standby power transformers, specifically fiber optical current and voltage sensors and, more particularly, to applications involving filters for use in such sensors, such as frequency tracking comb filters. According to one embodiment, a method for monitoring a connection condition of a stand by power transformer includes the steps of measuring a current flowing through a high voltage side of the standby power transformer using at least one optical current sensor disposed proximate to a current flow path of the high voltage side, using a comb filter to filter the measured current, determining whether the filtered, measured current is less than a predetermined threshold value; and generating an alarm indication that the high voltage side of the standby power transformer is unconnected.

Abstract: 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.

Abstract: A voltage sensing circuit includes an amplifier having a first input and an amplifier output, the first input being coupled to a node comprising a virtual ground, and a first impedance element having an input structured to be coupled to the conductor and an output coupled to the first input of the amplifier through the node. The first impedance element is structured to cause a current signal having a current directly proportional to the voltage on the conductor and a substantially zero volt voltage to be provided to the first input of the amplifier through the node responsive to the voltage of the conductor being provided to the input of the first impedance element. The amplifier is structured to cause an output voltage that is directly proportional to the current of the current signal to be provided at the amplifier output.

Abstract: A detecting apparatus includes a first resonator configured to generate a first resonance signal based on power output from a power supply in response to an object changing within a range of a field of the first resonator, a switch configured to connect the first resonator to the power supply in response to a control signal, and a controller configured to sample a value of an envelope of the first resonance signal to detect a change in the object.

Abstract: An apparatus for estimating a building's energy consumption, including thermal response processor and a regression engine. The thermal response processor generates energy use data sets, each having energy consumption values along with corresponding time and outside temperature values. The consumption values within each of the data sets are shifted by one of a plurality of lag values relative to the time and temperature values, where each of the plurality of lag values is different from other lag values. The thermal response processor performs a regression analysis on each of the energy use data sets to yield corresponding regression model parameters and a corresponding residual. The thermal response processor determines a least valued residual from all residuals yielded by the regression engine, the least valued residual indicating an energy lag for the building, and regression model parameters that correspond to the least valued residual are employed to estimate the energy consumption.

Abstract: A dynamic power meter circuit receives a set of clock signals. The clock signals are summed by a clock sum adder, thereby generating a clock sum value. A dynamic power meter output value is generated based at least in part on the clock sum value. In one particular example, a dynamic power meter circuit receives clock signals and from them generates a clock sum model sub-value. The dynamic power meter circuit also receives event signals, and from them generates an architectural event model sub-value. A corresponding pair of clock sum model sub-value and architectural event model sub-value are then ratiometrically combined, thereby generating a dynamic power meter output value. Due to the use of both event signals and clock signals, a stream of dynamic power meter output values is generated that more closely tracks actual dynamic power of a circuit being monitored.

Abstract: A phase angle can be measured between an analogue signal and a reference signal by converting the analogue signal to digital samples in a residue number system (RNS) analogue-to-digital converter (ADC), based on a RNS scheme. The phase angle can be measured directly from the RNS values output by the RNS ADC, or the RNS values can be converted to a binary scheme, such as straight binary, offset binary or two's complement, before calculating the phase angle measurement.

Abstract: This invention relates to an apparatus, a method and a computer program for calculating one or more scattering parameters of a linear network, the network including a number of N ports adapted to provide electric connections. The apparatus is configured to calculate, and the method includes calculating, one or more scattering parameters of the linear network, which are related to a reference impedance, on the basis of a measured electrical response at one or more ports of the linear network to an incident wave applied at a port of the linear network, measured under the condition that one or more of other ports of the linear network face a reflection coefficient ? with an amplitude ? of 0.5 or larger. The computer program is adapted to perform such a method and runs on a computer.

Abstract: The invention relates to a device for variably attenuating a radiated microwave signal, which comprises a variable volume tight cylinder (11) filled with an electromagnetic energy absorbing liquid and remote control means.

Abstract: A testing method for a micro electro-mechanical system is described, comprising the steps of: i) feeding a system to be tested on a first tray; ii) collecting the system from the first tray; and iii) verifying correct operation of the system collected from the first tray; the method further comprises step iv) of acquiring at least one parameter associated with the presence or otherwise of the system on the first tray; and/or with the fact that the system matches or otherwise a correct identification code; and/or with correct or incorrect orientation and/or position of the system on the first tray; step iv) being performed prior to step ii).

Abstract: A method for detecting electrical faults in an electrical circuit having transmission wires for power transmission includes determining whether a potential electrical fault condition exists along the transmission wires and confirming the potential electrical fault is an actual electrical fault. If the potential electrical fault is confirmed as an actual electrical fault, the method may disable the electrical circuit.

Abstract: The present disclosure provides a current monitoring circuit for monitoring current in a geophysical survey system. The circuit may be utilized in dipole-dipole systems including one or more electrode stations or in loop systems. The circuit includes a transmitter configured to generate an output current. One or more current monitors are positioned to detect current at or near the electrode stations or at positions along the one or more loops. Measured current data is transmitted back to the transmitter, which may be shut down if necessary. Methods for monitoring current in a geophysical survey system arc also provided.

Abstract: Disclosed is a method for diagnosis of a solenoid valve, wherein said solenoid valve comprises a solenoid and a moveable valve element, wherein said moveable valve element is moveable between a first state and a second state, wherein the movement from said first state to said second state is achieved through supply of current to said solenoid. The method comprises: to, at a first time, where the current through said solenoid is increasing, determine a first derivative for said current, to, at a second time, following said first time, and where the current through said solenoid is increasing, determine a second derivative for said current, and to, based on a comparison between said first derivative and said second derivative, diagnose said solenoid valve.

Abstract: Systems and methods for detecting faults in a power distribution network are described. In an aspect, the systems and methods determine a probability that each node of the network is powered and a probability that each distribution line in the network is faulted. In another aspect, the systems and methods determine the probabilities by transmitting a signal over a power distribution network with an active sounding system. In an additional aspect, the systems and methods determine the probabilities by utilizing collected data coupled to the power distribution network.

Abstract: Devices (1) for detecting problems in cable systems (2) comprising cables (20-24) and loads (31-34) are provided with injectors (11, 12) for injecting first investigation signals into the cables (20-24), receivers (13) for receiving first reflection signals comprising first reflections of the first investigation signals from the cables (20-24), and processors (14). The processors (14) convert the first reflection signals into reflection values and determine differences between the reflection values and reference values. A firstly occurring significant difference of the differences is indicative for the problem, and a moment in time of the firstly occurring significant difference is indicative for a location of the problem. Previously received reflection signals comprising reflections from previously injected investigation signals that have been injected at moments in time at which there were no problems in the cable system (2) may be converted into the reference values.

Abstract: An object of the invention is to provide a semiconductor apparatus capable of achieving conditions that are stricter than the conditions in which the stable operation is guaranteed, without increasing the circuit size. A semiconductor apparatus (10) includes a semiconductor circuit (11); a voltage generator (12) that selects one of at least two types of voltages and applies a power supply voltage, the at least two types of voltages including a normal voltage at which the semiconductor circuit (11) normally operates and a low voltage which is lower than the normal voltage; and a clock generator (13) that supplies the semiconductor circuit (11) with a clock signal having a constant frequency regardless of the power supply voltage.

Abstract: The present disclosure provides an automated testing platform including a machine station, a transporting and positioning mechanism, a manipulator actuating mechanism, a test box, a loading and unloading device, a defective product storage unit, a protective cover, and a loading and unloading cart used in conjunction with the loading and unloading device. The transporting and positioning mechanism is installed on the machine station; the transporting and positioning mechanism includes a base plate, sliding rails and a material-taking mechanism; the base plate is provided with a feed port and an outlet port; the base plate is provided with two sliding rails; the material-taking mechanism is movably arranged on the sliding rails; the manipulator actuating mechanism is installed on the machine station; the manipulator actuating mechanism includes a manipulator and an image positioning device; the loading and unloading device is located at the feed port and the outlet port.

Abstract: An automatic test system and method are provided. The automatic test system includes at least one formation apparatus and a test fixture. The formation apparatus receives a first control command from a network and executes a test procedure according to the first control command. The test procedure includes a charging mode and a discharging mode. The test fixture is selectively coupled to the formation apparatus. During the test procedure, when the test fixture is coupled to the formation apparatus, the test fixture generates a first measurement result. The test fixture transmits the first measurement result to the formation apparatus via a wireless communication interface of the test fixture.

Abstract: A power supply device for a test equipment, test equipment having a power supply device and a method for operating a power supply device are described. The power supply device is configured for an at least partly capacitive load and has an output voltage provider configured to generate a target voltage, which is energized by an input supply voltage provided at an input of the power supply, wherein the target voltage generates an output supply voltage at the capacitive load, when the capacitive load is connected to an output of the power supply and a supply current monitor configured to monitor supply current flowing into the input of the power supply and to temporarily reduce the target voltage generating the output supply voltage, if a current value of the supply current exceeds a first predetermined threshold.

Abstract: A semiconductor system includes a controller and a semiconductor device. The controller outputs a burn-in test signal, a clock signal and command/address signals. The semiconductor device enters a first test mode if the burn-in test signal is inputted. The semiconductor device enters a second test mode according to a level combination of the command/address signals in synchronization with the clock signal after the semiconductor device enters the first test mode. The semiconductor device enters a third test mode according to an other level combination of the command/address signals in synchronization with the clock signal after the semiconductor device enters the second test mode.

Abstract: A thermal controller includes a thermal control interface to receive test data from an automated test equipment (ATE) system and dynamically adjust a target setpoint temperature based on the data and a dynamic thermal controller to receive the target setpoint temperature from the thermal control interface and control a thermal actuator based on the target setpoint temperature.

Abstract: Various particular embodiments include a via testing structure, including: a first terminal coupled to a first set of sensing lines in a top level of the structure; a second terminal coupled to a second set of sensing lines in the top level of the structure, wherein first set of sensing lines and the second set of sensing lines are disposed in a comb arrangement; a third terminal coupled to a third set of sensing lines in a bottom level of the structure; and a plurality of vias electrically coupling the second set of sensing lines in the top level of the structure to the third set of sensing lines in the bottom level of the structure, each via having a via top and a via bottom.

Abstract: An active device array substrate includes a substrate, an inspection circuit, pixel structures, a passivation layer, and conductive pads. The substrate has a display area and a peripheral area outside the display area. The inspection circuit is located on the substrate and includes inspection switches, inspection control lines, and inspection traces. Each of the inspection switches is located in the peripheral area and controlled by one of the inspection control lines. Each of the inspection traces is connected to one of the inspection switches and includes a first conductive wire segment and a second conductive wire segment. The second conductive wire segment is connected between the first conductive wire segment and one corresponding inspection switch. An electric conductivity of the second conductive wire segment is lower than an electric conductivity of the first conductive wire segment.

Abstract: Operational and functional testing of the optical Physical Media Dependent Integrated Circuits (“PMD ICs”) is achieved by constructing a switchable on-chip load with similar or equivalent electrical characteristics of a targeted photonic device.

Abstract: An electronic device with COF package is provided. The electronic device includes a flexible substrate, a core circuit unit, multiple output pads and multiple switching elements. First terminals of the switching elements are respectively and electrically connected to output pads of the core circuit unit, and second terminals of the switching elements are respectively and electrically connected to the output pads. In a test stage of the electronic device, the switching elements are sequentially turned on such that one of multiple output signals of the core circuit unit is transmitted to a common test pad outside of the electronic device through corresponding one of the output pads.

Abstract: The Fast Fourier transform describes functions into different dimensions or coordinates such as Cartesian to spherical. For example, a function could be represented in the domains of time and frequency. The concept of the 3-D FFT has the same form as the mathematical representation of the 2-D FFT utilizing a 1-D FFT. This technique is essentially a spatial filtering operation in which the hologram functions as a matched filter. It has been applied here, to function as 4-D FFT by adding the dimension of time to recognize the presence of a specific electronic circuit and detect the moment when specific voltage levels or signals are present within or acting upon, the circuit or device under test and development. Any dynamic changes in the test object from ideal or recorded conditions, such as by defects in the device under test's circuitry or from prescribed voltage or signal induced operating parameters, will not result in the reconstruction of the desired object wave or holographic image.

Abstract: Methods include determining first and second voltages of a battery before and after a load interval, determining a current through the battery during the load interval, and determining a status of the battery from the determined first and second voltages and the determined current. The load interval may include an interval during which a discharge pulse is applied to the battery, and the first and second voltages may be voltages when the battery is open circuited. The first voltage may be determined before the battery transitions from an open-circuited state to a pulse discharge state, and the second voltage may be determined after the battery transitions from the pulse discharge state to the open-circuited state. Corresponding battery monitoring apparatus and computer program products are also described.

Abstract: A control scheme creation method according to an embodiment includes executing, on a computer, processing of calculation of the amount of stored or released energy of each of a plurality of energy storage devices for each of a plurality of periods based on estimation value information on the amount of energy consumption within a target area and based on remaining amount information representing the amount of remaining energy of each of the plurality of energy storage devices. Furthermore, the control scheme creation method includes executing, on the computer, processing of determination of storage timing or release timing for the energy storage device for each of the periods based on the calculated amount of stored or released energy.

Abstract: A battery voltage detection device includes a battery; a voltage detection circuit; and a low-pass filter provided between the battery and the voltage detection circuit. The low-pass filter includes a capacitor of which one end is connected to a terminal of the battery and the other end is connected to a voltage source outputting a voltage higher than a terminal voltage of the battery.

Abstract: It is presented a method for determining a battery type of a battery set powering a host device, the battery set comprising at least one exchangeable battery. The method is performed in a battery type determiner and comprises the steps of: measuring a voltage of the battery set, yielding a voltage measurement; determining charge depletion of the battery set; storing the voltage measurement and the charge depletion; repeating the steps of measuring, determining charge depletion and storing until an exit condition is true; and determining the battery type based on the stored voltage measurements and the stored charge depletion. A corresponding battery type determiner, host device, computer program and computer program product are also presented.

Abstract: An inspection method for a secondary battery according to the invention includes: a first aging treatment process for performing aging treatment on the secondary battery that has initially been charged at a first temperature; a first voltage measurement process; a second aging treatment process for performing the aging treatment on the secondary battery at a second temperature; a second voltage measurement process; a self-discharge amount computation process; a non-temperature dependent failure determination process for determining non-temperature dependent failure that does not depend on a relationship between a self-discharge amount and a temperature in accordance with the measured self-discharge amount; and a temperature dependent failure determination process for determining temperature dependent failure that depends on the relationship between the self-discharge amount and the temperature in accordance with the self-discharge amount, temperature dependency of which is suppressed.

Abstract: A method for estimating the ageing of at least one cell of a storage battery includes acquiring a voltage across the terminals of the cell and an amperage passing through the cell, and calculating a maximum capacitance and a level of charge of the cell in accordance with the voltage and the amperage acquired. The calculation is made by resolving: a system of discretized equations corresponding to a modelling of the cell as an electric circuit includes, in series, an ideal voltage source, a resistor, a first resistor and capacitor pair connected in parallel, and at least one second resistor and capacitor pair connected in parallel; and a discretized equation for estimating the variation in the maximum capacitance of the cell.

Abstract: An exemplary assembly for testing a wireless charge transmit system includes a portable tester that is configured to mimic a vehicle mounted charge receive system and to wirelessly interface with a wireless charge transmit system.

Abstract: A magnetic sensor device having a first magnetic core structure which is aligned along a first central longitudinal axis and has at least one first coil, and having a second magnetic core structure which includes at least one second coil, the second magnetic core structure extending from a first end face of the second magnetic core structure along a second central longitudinal axis to a second end face of the second magnetic core structure, the second central longitudinal axis lying in a plane aligned in a direction normal to the first central longitudinal axis, and the second magnetic core structure being positioned in relation to the first magnetic core structure in such a way that a clearance between the first end face of the second magnetic core structure and a first center of mass of the first magnetic core structure is less than 20% of a maximum extension of the first magnetic core structure along the first central longitudinal axis.

Abstract: A tunneling magneto-resistor (TMR) device for sensing a magnetic field includes a first TMR sensor having a first MTJ (magnetic tunneling junction) device and a second MTJ device connected in parallel. Each of the first and second MTJ devices has a pinned layer and a free layer. The pinned layer of each of the first and second MTJ devices has a pinned magnetization at a first pinned direction. The free layers of the first and second MTJ devices have a first free magnetization parallel to and a second free magnetization anti-parallel to a first easy-axis respectively.

Abstract: A stable assembly of a metal detector is disclosed which can ensure a tension free physical connection between a former and a case of the metal detector. The metal detector includes a case with at least four closed sides and two openings, a non-conductive former having a pass-through aperture, and electromagnetic coils arranged on the former to produce an electromagnetic field within the former which is disturbed by a metallic body passing through the aperture. The former formed into a single piece and having a width equal to the inner width of the case, is inserted into the case from the front side of the case. The space between the former and the case is filled with a potting medium. The physical connection between the former and the case includes a protruding-recess which is strengthened by an adhesive.

Abstract: A magnetism sensor includes a magnetism reaction section having a gas cell filled with a gas that rotates the plane of polarization of laser beam passing through the magnetism reaction section in correspondence with the intensity of a magnetic vector, a light guide section that guides the laser beam to the magnetism reaction section, and a light detection section that detects the angle of rotation of the plane of polarization of the laser beam having passed through the magnetism reaction section. The light guide section and the light detection section are positionally fixed to each other, and the magnetism reaction section is so provided as to be attachable and detachable to and from the light guide section and the light detection section.

Abstract: Nuclear magnetic resonance (MR) imaging can include use of an electrical transceiver coil system comprising an array of segmented loops. The array can be arranged about a portion of an imaging subject and arranged to provide surgical access to a region of the imaging subject from at least one direction. The segmented loops can establish a volumetric radio frequency (RF) excitation field across a volume-of-interest associated with the imaging subject in response to the segmented loops receiving specified transmit phases providing a non-90-degree relative phase between segmented coil loops at adjacent ones of the segmented loops. All or at least some of the segmented loops can provide outputs indicative of an RF signal from the imaging subject, the RF signal elicited in response to RF excitation. The transceiver coil system can facilitate pre-operative, intra-operative, or post-operative MR imaging, such as facilitating access for a surgical procedure.

Abstract: In a method and device for checking a body coil of an MRI system a current value of one or more parameters of the MRI system is acquired under a specific condition. The current value is compared with a reference value of the parameter to obtain a comparison result. A state of the body coil is determined according to the comparison result. The method for checking a body coil of an MRI system according to a particular embodiment of the present invention can replace onsite periodic maintenance inspection by a maintenance engineer, and also detect damage to the body coil at an early stage.

Abstract: A specially shaped coil assembly for accurate adjustment of the magic angle is provided to permit accurate adjustment of an angle made between the direction of a static magnetic field and the axis of sample spinning without impairing the resolution of NMR signals. The sample is placed within the external static magnetic field B0. The coil assembly is for use in a solid-state NMR apparatus that performs NMR detection while spinning the sample about an axis tilted at the magic angle relative to the external static magnetic field B0. The coil assembly comprises a pair of arcuate conductor lines and a pair of straight conductor lines. Each of the arcuate lines has a diameter of 2a. Each of the straight lines has a length of 2L. The diameter 2a and the length 2L are so selected as to satisfy the relationship: 1.91?2L/2a?2.15.

Abstract: A magnetic resonance (MR) system 10 includes at least one cable (30, 32, 34) that has at least one optic fiber component (31C, 31E, 33B, 35B) and an optical monitoring unit (37) in communication with the at least one optic fiber component (31C, 31E, 33B, 35B). The optical monitoring unit (37) is configured to determine temperatures at each of a plurality of positions along the at least one optic fiber component (31C, 31E, 33B, 35B). The optical monitoring unit (37) is further configured to halt an operation of the MR system (10) in response to at least one determined temperature. In accordance with the invention, the temperature of one or more cable traps forming part of the cable can be monitored and a faulty cable trap can be detected.

Abstract: An MRI apparatus is provided in which, in a superconducting magnet using a high-temperature superconducting wire, deterioration in a heat insulation function of a vacuum tank can be prevented even in a case where cooling performed by a freezer is stopped for a long period of time, and thus rapid cooling can be performed so that a temperature is reduced to a threshold temperature or lower of the high-temperature superconducting wire after an operation of the freezer is resumed. For this, the MRI apparatus includes a superconducting coil 105 that generates a static magnetic field, a vacuum container 107 that accommodates the superconducting coil 105, a freezer that is in thermal contact with the superconducting coil 105 so as to cool the superconducting coil 105, and a vacuum degree reduction preventing portion (205 and the like) which prevents a degree of vacuum of the vacuum container from being reduced in a case where a cooling function of the freezer is deteriorated or stopped.

Abstract: A method of acquiring PET and MR images simultaneously includes obtaining raw k-space data for continuous MR volumes and acquiring PET information. The method further includes performing a joint multi-modality image reconstruction and generating a set of PET and MR images. The method additionally includes generating a set of MR fingerprints from the reconstructed MR images and using the MR fingerprints to generate a set of parameter maps.

Abstract: The invention relates to a method of MR imaging of an object (10) placed in an examination volume of a MR device (1). The method comprises the steps of: subjecting the object (10) to an imaging sequence for acquiring MR signal data, wherein the MR signal data are acquired as a function of k-space position and time by using an irregular k-space sampling pattern with sub-sampling of k-space; reconstructing MR image data from the MR signal data, which MR image data comprise spatial dimensions and a frequency dimension, sparsity of the MR image data in a transform domain being exploited for suppressing sub-sampling artefacts in the MR image data. Moreover, the invention relates to a MR device (1) and to a computer program.

Abstract: Provided is a system and method for performing a magnetic resonance fingerprinting imaging process. The process includes determining acquisition parameters including at least one of repetition time (TR) or flip angle (FA), selected to control one of a duration and a number of repetitions of for a pulse sequence that samples k-space in a Cartesian acquisition pattern by acquiring an echo train. The process also includes controlling a magnetic resonance imaging (MRI) system to perform the pulse sequence a plurality of times to acquire magnetic resonance fingerprinting (MRF) data corresponding to signals from the subject excited by the pulse sequence. The process also includes estimating quantitative tissue properties of the subject by comparing the MRF data to a database and reconstructing, from the MRF data, at least one image of the subject indicating the estimated quantitative tissue properties.

Abstract: In a magnetic resonance (MR) system and method for determining an MR system frequency for a region to be examined that has multiple materials therein, a first frequency spectrum is acquired by the execution of a first RF excitation sequence. A second frequency spectrum for the region is acquired by radiation of an RF inversion pulse and execution of a second RF excitation sequence, at the point in time at which the relaxation curve of one of the materials has a zero-crossing. Subsequently, echo signals excited by the second RF excitation sequence are read out, from which a frequency spectrum is determined. The first frequency spectrum and the second frequency spectrum are compared. On the basis of the comparison, maxima of the first frequency spectrum are allocated to different materials. The system frequency is determined on the basis of the allocation of the maxima.

Abstract: Methods, and systems and apparatus for implementing the methods, are described for performing efficient multispectral magnetic resonance imaging, such that images of multiple contrast weightings for each slice are acquired in a single scan. Such differentially weighted MR images are thus suitable for generating a plurality of coregistered parameter maps for each slice. The methods may comprise applying a first excitation pulse to a first slice of a subject; detecting a first plurality of echo signals emitted by the first slice after the first excitation pulse; waiting a first period of time; applying a second excitation pulse to the first slice during partial recovery of a longitudinal magnetization of the first slice; and detecting a second plurality of echo signals emitted by the first slice after the second excitation pulse.