摘要:
A geomagnetic field measurement device has a three-dimensional magnetic sensor and a storage device that stores plural pieces of magnetic data sequentially output from the three-dimensional magnetic sensor. The geomagnetic field measurement device calculates, based on the pieces of magnetic data, a distortion estimation value indicating a degree of difference in shape between a three-dimensional figure defined so that the plural sets of coordinates indicated respectively by the plural pieces of magnetic data are distributed adjacent to a surface thereof and a spherical surface, and determines whether there is distortion in the shape of the three-dimensional figure based on the distortion estimation value, to update an offset for correcting each of the plural pieces of the magnetic data in a case in which it is determined that there is no distortion.
摘要:
The invention relates to a method for measuring at least one of the parameters of torsion angle, change in length, or magnetic field. To this end, a dynamic magnetization is generated according to the invention in a first conductor segment (AB) of a magnetizable or magnetized electrically conductive conductor arrangement (AD) by applying a magnetic field and applying a current impulse to the first conductor segment (AB). A magnetization is thus induced and migrates from the first conductor segment (AB) into a second conductor segment (CD) comprising a helical anisotropy (α). The anisotropy (α) allows the magnetization thus transported to be captured by means of a voltage generated across the second conductor segment due to the transport of the magnetization (9), said magnetization being a dimension for the parameter of torsion angle, change in length, magnetic field, or a mixture of a plurality of said parameters. During the measurement, at least one conductor segment (AB; AD) of the conductor arrangement is exposed to a magnetic field having a modified magnetic field strength, and the dynamic magnetization is determined at at least two different magnetic field strengths of the modifiable magnetic field. The voltages (9) thus obtained and detected at the different magnetic field strengths are used together for forming the dimension for the parameter of the torsion angle, the change in length, and/or the magnetic field. The method is suitable for producing sensors.
摘要:
The present invention provides a method for measuring hydrogen concentration in an electrically conductive material, such as a nuclear fuel rod (300), comprising calibrating an eddy current probe (200) at a plurality of hydrogen concentrations; measuring eddy currents at a plurality of positions along an electrically conductive material; and calculating a hydrogen concentration in the electrically conductive material at each of the positions along the electrically conductive materia). The present invention also provides a system for measuring hydrogen concentration in a nuclear fuel rod (300), comprising an eddy current probe (200); a nuclear fuel rod calibration standard (230); a data handling system for collecting data generated by the eddy current probe (200) and for performing calculations using the data. The system may be utilized in-situ and may comprise a movable probe mount configured to hold the eddy current probe and to traverse the calibration standard and the nuclear fuel rod to be measured.
摘要:
The present invention provides a magnetic flux measuring device and magnetic flux measuring method for stationary induction electrical apparatus which can accurately measure the magnetic flux without being influenced by the DC offset component which superimposes on the measurement system, and can constantly and continuously measure the magnetic flux without setting a limit in the magnetic flux measurement period. The magnetic flux measuring method which measures a magnetic flux of a stationary induction electrical apparatus 2 using a voltage waveform of the stationary induction electrical apparatus 2, wherein the magnetic flux 151 of the stationary induction electrical apparatus 2 is determined by the steps of: inputting a voltage waveform 121 of the stationary induction electrical apparatus 2 into a negative-feedback amplification means 14 of which feedback circuit is constructed by a low pass filter; and integrating output of the negative-feedback amplification means 14 by integration means 15.
摘要:
A microelectromechanical systems (MEMS) device (10) manufactured on a microscopic scale (42) using integrated circuit techniques provides a sensitive magnetic field sensor (73) by detecting motion caused by the Lorentz force (F) produced by a current (Ip) through a MEMS conductor (46). The resulting MEMS may be used as a component in a variety of devices including current sensors (84) and proximity sensors (88).
摘要:
A magnetometer includes at least one sensor (10) for sensing a magnetic field component, a biasing circuit (6), and a processor (1). The sensor (10) generates an output signal having a signal characteristic that varies in response to the sensed magnetic field component and in response to an applied bias. The biasing circuit (6) dynamically biases the sensor (10) in response to a bias setting signal. The processor (1) is coupled to receive the output signal from the sensor (10) and coupled to the biasing circuit (6). The processor (1) is operable to generate the bias setting signal (3) and thereby control the biasing circuit (6) to dynamically bias the sensor such that the signal characteristic of the output signal is maintained in a target range. The processor (1) determines the magnetic field component sensed by the sensor (10) as a function of the bias setting applied to the sensor.
摘要:
A method and apparatus for detecting magnetic fields in which a string (1) carries an alternating current. The displacement of the string from its unperturbated position due to a magnetic gradient across the string is detected by pick-up coils (L1, L2). The signals from the pick-up coils are demodulated using a signal derived from the alternating current to produce an output.
摘要:
Eine Sonde zur Erfassung von magnetischen Wechselfeldern weist einen hochpermeablen Sondenkern (10) und eine diesen umgebenden Meßwicklung auf, die aus mehreren, in Reihe geschalteten Spulen zuammengesetzt ist. Zwecks Schaffung einer Sonde, die geeignet ist für die Erfassung extrem niederfrequenter, magnetischer Wechselfelder aus einer Mindestdistanz, die üblicherweise für die Detektion von solche Wechselfelder erzeugenden Schwimmkörpern gefordert wird, ist der Sondenkern (10) aus flachen Streifen (16) aus amorphem oder mikrokristallinem, magnetisierbarem Material mit dazwischenliegenden Isolationsstreifen (17) zusammengesetzt. Die Spulen der Meßwicklung sind als selbsttragende Spulen, vorzugsweise als Backlackdrahtspulen, ausgebildet und umschließen den Sondenkern (10) nahezu abstandslos.