119results about "Superconductive properties measurements" patented technology

The quench of the superconducting coil is desired to be detected early while suppressing the influences of the noise generated in charge and discharge of the superconducting coil. A superconducting coil quench detection apparatus detects the balance voltage of a bridge circuit formed by the superconducting coil and a resistor to output it as a quench detection signal for detecting the quench thereof. A signal indicating the hold period where the energy accumulated in the superconducting coil is held is generated. A signal included in the hold period is extracted from the quench detection signal. The quench of the superconducting coil is detected based on the extracted signal.

The present disclosure relates to a system and method for analyzing a superconducting wire. A method in accordance with at least one embodiment described herein may include performing a voltage/current (VI) test for each of a plurality of portions of superconducting wire. The VI test may include determining a plurality of VI data points for each of the plurality of portions of superconducting wire at a first VI datapoint of about (Ic (critical current), Ec (critical electric field)) and at a second VI datapoint of about (Ix, Ex). Ex may be at least 10 times Ec and Ix may be approximately equal to the current resulting at that voltage drop. The method may further include analyzing the plurality of VI data points for each portion of superconducting wire to determine if one or more of the portions of superconducting wire are defective. Of course, numerous other embodiments are also within the scope of the present disclosure.

The invention provides a superconducting tape testing device which comprises a testing station and a Duwa container wherein the testing station further includes a base; a stretching part consisting of several first screw rods that stand vertically on the base and a sliding plate cooperating with the first screw rods; a fixing part consisting of a lower clamping body arranged on the base and an upper clamping body arranged in a rotation manner on the sliding plate; and a twisting part consisting of several rotation plates arranged on the upper clamping body through several vertical rods. The rotation plates can drive the upper clamping body to rotate. The Duwa container is filled with liquid nitrogen which cools the superconducting tape to a superconducting state. The superconducting tape testing device of the present invention integrates the functions of tape fixing, stretching and twisting and is capable of performing critical current testing under stretching and twisting combined stresses, and the stretching and twisting combined stresses can be easily adjusted. Therefore, the testing device has high testing efficiency.

A measuring device for measuring the alternating current (AC) loss of a high-temperature superconductor is disclosed. In accordance with an embodiment of the present invention, the device includes a pulse power supply unit, which outputs pulse power in a cycle, a lead wire, which is formed on both sides of the pulse power supply unit and applies the pulse power to a superconductor, a degaussing coil unit, which is connected to one side of the superconductor and cancels an inductive voltage, a shunt unit, which is serially connected between one side of the degaussing coil unit and one side of the pulse power supply unit, and a measurement unit, which is connected to both ends of the shunt unit and measures an electric current flowing through the superconductor.

The invention provides a test device and a test method of critical current of superconductive wires under mixed stress. According to the device, electromagnet housings are fixed on left and right sides of a Dewar flask; an excitation coil is installed in an inner cavity of each electromagnet housing; an output shaft housing is installed on the top plate on the Dewar flask and penetrates through the top plate through a bearing; the main shaft of the motor is connected with a main gear; the main gear is engaged with a toothed ring fixed on the output shaft housing; a vertical servo motor is fixed on the top end of the output shaft housing; the output shaft of the vertical servo motor downwards penetrates through the output shaft housing and then is connected with an upper clamp; the upper clamp clamps the upper end of a superconductive wire; the lower end of superconductive wire is clamped by a lower clamp; the lower clamp is fixed on a fixed base at the bottom of the Dewar flask; a transverse servo motor is installed on a table top of a support table and is connected with a poly(tetrafluoroethylene) disc through a guidance rod and a force transmission rod; and the disc is arranged on the left side of the middle part of the superconductive wire. The test device is capable of testing the critical current of the superconductive wire under different bending radiuses, tension force, torsion angles and magnetic fields.

The present invention relates to a microfluidic chip for measuring the magnetic susceptibility of a superparamagnetic nanoparticle droplet and a method for measuring magnetic susceptibility using the same. According to the invention, the magnetic susceptibility of a superparamagnetic nanoparticle can be continuously and accurately measured in a flowing fluid using a microfluidic chip including microfluidic channels.

A continuous observation apparatus of magnetic flux distribution in which a long sample containing a superconducting material or magnetic material is transferred to an observation position and magnetic flux is observed sequentially at each of certain areas along a longitudinal direction of the sample is provided. A method of continuously observing magnetic flux by which a long sample containing a superconducting material or magnetic material is transferred to an observation position and magnetic flux is observed sequentially at each of certain areas along a longitudinal direction of the sample is also provided.

The invention discloses a quenching detection device and method for a high-temperature superconducting magnet. The quenching detection device comprises a fiber bragg grating string FBG1, a fiber bragggrating string FBG2, a data acquisition module and a data processing module, wherein a plurality of fiber gratings are arranged on the FBG1 and the FBG2; the fiber bragg gratings can sense tiny deformation and temperature rise of the magnet due to quench in time, and are sensitive to the temperature and strain of the high-temperature superconducting magnet; the FBG1 and the FBG2 are wound on thesurface of the high-temperature superconducting magnet in parallel, the FBG1 is attached to the surface of the high-temperature superconducting magnet, and the FBG2 is attached to the surface of the high-temperature superconducting magnet by using mucilage glue, so that the temperature and the strain of each position of the high-temperature superconducting magnet can be rapidly detected at the same time; when the magnet has a local fault, due to accumulation of heat in a local area, the area can quickly change in temperature and strain; and although the voltage of the magnet at the moment is not changed, the fault of the magnet can be detected through the change in temperature and strain, so that the quench detection speed of the high-temperature superconducting magnet is greatly improved.

An apparatus for measuring spin polarization via Point Contact Andreev Reflection (PCAR) at a magnet-superconductor junction, with variable magnetic fields and temperature control. A cryostat probe investigates superconducting energy gap and Andreev reflection in superconductor-half metal junctions, in a wide range of magnetic fields and temperature from 2K-300K. The cryostat probe is integrated with a commercial physical properties measurement system. The measurement probe includes a rotary-translation stage with coarse and fine screws that enable a user to make point contacts in a cryogenic, evacuated environment where the point contact junction can be controlled at room temperature by turning a knob. Copper wires are connected as electrical leads from an aluminum housing, descend down to a copper housing, for measurement, when contact is made by tip with a half-metal sample, such as CrO₂. External current and voltage meters measure the current-voltage characteristics and data acquisition is performed using computer interface.

The invention discloses a critical current testing device and method for a high-temperature superconducting tape in a spiral winding state. The device comprises a base body, a first fixing platform, asecond fixing platform and a locking assembly. The base body comprises a first positioning section, a first limiting section, a winding section, a second limiting section and a second positioning section which are coaxially arranged and sequentially connected to form a stepped shaft. A plurality of spiral grooves with different pitches are formed in the outer wall of the winding section. At leastone spiral groove is arranged along the clockwise direction of the axial direction of the base body, and the rest spiral grooves are arranged along the anticlockwise direction of the axial directionof the base body. The first fixing platform comprises a first sleeving section and a first platform section. The second fixing platform comprises a second sleeving section and a second platform section; The locking assembly comprises a first locking piece and a second locking piece. According to the invention, the critical current testing function of the high-temperature superconducting tape under different spiral pitches can be realized, the exploration of the regularity of the critical characteristics of the high-temperature superconducting tape is realized, and a reliable experimental testing method is provided for the application and popularization of the high-temperature superconducting tape.

The invention discloses a device for testing a superconducting tape. The device comprises a fixing table, a fixator, a bender and a magnetism adjusting assembly, wherein the fixator, the bender and the magnetism adjusting assembly are used for fixing two ends of the superconducting tape respectively; the two fixators are both installed on the fixing table. The bender is fixed on the fixed table and is provided with a bending surface for the superconductive strip to bypass and for bending the superconductive strip; the magnetism adjusting assembly comprises a magnetic unit and an adjusting mechanism. The adjusting mechanism is installed on the fixing table and used for driving the magnetic unit to move. The magnetic unit is installed on the adjusting mechanism and right faces the bent face,and a magnetic field area allowing the superconducting tape to penetrate through is formed between the magnetic unit and the bent face. The whole operation is convenient, and the test efficiency canbe improved.

The invention relates to a twisted type superconducting tape critical current detection device. The device comprises a test unit and a cryogenic unit; the cryogenic unit comprises a cooling medium storage container and a cryogenic Dewar; the cryogenic Dewar comprises a cryogenic Dewar shell and a Cryogenic Dewar flange located at the top end of the shell; the cryogenic Dewar flange is provided with a copper current lead which vertically passes through the cryogenic Dewar flange and a rotating handle on the upper surface of the cryogenic Dewar flange; the test unit includes a signal connector which is connected with a data acquisition control system, and a rotary contact type current lead unit which is connected with the copper current lead through a wire; and a bracket, background magneticfield magnets, a superconducting tape twisting unit and fastening portions are arranged in the cryogenic Dewar shell, wherein the bracket is formed by horizontal bracket components and vertical bracket components, the background magnetic field magnets are arranged between the horizontal bracket components and the vertical bracket components, and the fastening portions are provided with springs. The detection device of the invention has the advantages of complete functions, convenient and quick use, high efficiency and high precision. With the twisted type superconducting tape critical currentdetection device, different torsional intercepts can be obtained, and the critical current characteristics of a single or plurality of twisted superconducting tapes under different temperatures and different magnetic field magnitudes can be measured.

The invention provides a device and a method for testing the turning diameter of a superconducting strip. The device comprises: a strip discharging end capable of placing a superconducting strip to betested; a strip receiving end connected with one end of the superconducting strip to be tested and capable of recycling the superconducting strip to be tested from the strip discharging end; and a turning diameter test board, comprising a bending diameter test piece of a variety of bending diameters and capable of bypassing the superconducting strip to be tested to bend the superconducting stripto be tested according to the corresponding being diameter. The device provided by the invention can be used for quickly testing the critical turning diameter value of the superconducting strip through the bending diameter test piece of a variety of bending diameters, and can quickly, effectively and accurately measure the single-bending and double-bending critical turning diameter values of the high-temperature superconducting strip by combining the twice tests via a magnetic survey method.

A method and apparatus for measuring the magnetic field anisotropy of critical currents in conductive wires and conductive tapes having lengths of at least one meter. In one embodiment, the method and apparatus are adapted to measure the magnetic field anisotropy of critical currents in superconducting wires and tapes. The apparatus includes a magnetic field generation assembly that is capable of generating a magnetic field. The magnetic field is orthogonal to a current passing through a conductive wire or conductive tape positioned on an axis of the assembly. The magnetic field generation assembly and magnetic field are rotatable about the axis.

The present invention relates to an apparatus and method for measuring the critical current of a superconducting tape. A continuous critical current measurement apparatus for measuring critical current of a superconducting tape while feeding a superconducting tape in a liquid nitrogen container includes wheel-type current terminals and wheel-type voltage terminals. The superconducting tape is continuously supplied and fed by a reel-to-reel device, and the critical current of the superconducting tape is measured in real time using the wheel-type current terminals and the wheel-type voltage terminals while the superconducting tape is fed at constant linear velocity in contact with the wheel-type current terminals and the wheel-type voltage terminals.

Accordingly, current is applied using wheel-type current terminals and voltage is measured using wheel-type voltage terminals while a superconducting tape is continuously supplied by a reel-to-reel device, thus continuously measuring critical current without burning out the superconducting tape.

The invention discloses a superconductor critical current and shunt temperature test device comprising a back field magnet, a temperature-variable sample dewar, a superconducting transformer, a cryogenic system, and a quenching detection and quenching protection system. The cryogenic system comprises a cryogenic refrigerator, a liquid helium storage tank, a superconducting transformer dewar, a back field magnet dewar, and a cryogenic transmission pipeline. The superconductor critical current and shunt temperature test device of the invention is applicable to superconductor critical current and shunt temperature test in a high back field. The maximum test back field is 10T, and the maximum test current is up to 50kA. The superconductor critical current and shunt temperature test device of the invention has the advantages of high test precision, low test cost, convenience of sample replacement, short test cycle, and the like.

The invention provides a superconducting magnet quenching detection method and a superconducting magnet quenching detection device. The method comprises the following steps: detecting the voltage and current of each unit coil in real time; calculating the power difference between two adjacent unit coils, and calculating the absolute values of power differences between any unit coil and the two adjacent unit coils thereof; and if the absolute values of power differences between any unit coil and the two adjacent unit coils thereof are greater than a power quenching threshold, judging that the unit coil is in a power quenched state. Whether the power of each unit coil is quenched is detected, and the unit coils in a power quenched state are positioned accurately through comparison. Whether the voltage and temperature of each single coil are quenched is detected, and the single coils in a voltage and temperature quenched state are positioned accurately through step-by-step comparison. Electrical quantity detection and non-electrical quantity detection are combined, and the defect of a single quenching detection method is overcome. Meanwhile, a voltage correction coefficient is introduced, and the reliability of superconducting magnet quenching detection is improved greatly.

A method of facilitating superconducting tape manufacturing is provided that includes forming a long-length superconducting tape having a layered structure, comprising a substrate having a dimension ratio not less than about 100, a buffer layer overlying the substrate, and a high temperature superconducting layer overlying the buffer layer. The method further includes characterizing the superconducting tape to create a data set having a plurality of values that are a function of length of the superconducting tape and distributing both the superconducting tape and the data set.

The invention discloses a superconducting cable and conductor critical current testing device, which includes a back field magnet, a superconducting transformer, and a low temperature system. The low temperature system includes a Dewar and a liquid helium container arranged in the Dewar. The back field magnet and the superconducting transformer are immersed in the liquid helium in the liquid helium container. The back field magnet is suspended in the Dewar and is connected with a DC power supply through a high temperature superconducting current lead. The superconducting transformer is located above the back field magnet. A conductor sample under test is located in the back field magnet. A secondary coil of the superconducting transformer extends two pins downwards to be respectively connected to two ends of the conductor sample under test through a superconducting connector. A critical current of a superconducting cable or conductor under test can be obtained according to a quench criterion by measuring the voltage across and current through the two ends of the conductor sample under test. The back field magnet has a horizontal magnetic field direction, the sample under test can be easily perpendicular to the magnetic field direction, and the device of the invention has the advantages of high test precision, low test cost, compact device structure and so forth.

The invention provides a quench detection device and a quench detection method for an uninsulated high-temperature superconducting coil, the quench detection device comprises a plurality of uninsulated high-temperature superconducting coils and a plurality of magnetic field measuring devices, wherein each magnetic field measuring element comprises a magnetic field measuring coil or a magnetic field measuring device; the magnetic field measuring devices are arranged on the central axis of the one or more non-insulated high-temperature superconducting coils and in the surrounding space of the one or more non-insulated high-temperature superconducting coils; and the magnetic field measuring coils are arranged inside, outside or on the surface of one or more non-insulated high-temperature superconducting coils. Based on the principle of induced magnetic field attenuation during quench of the non-insulated high-temperature superconducting coil, the corresponding measuring device and method are designed, and quench of the non-insulated high-temperature superconducting coil is effectively monitored. According to the invention, the problem of difficult quench detection of the non-insulated high-temperature superconducting coil and the magnet is solved, and rapid and effective quench detection can be carried out on the non-insulated high-temperature superconducting coil, which is a key step for quench protection of the non-insulated high-temperature superconducting coil.

A method for measuring critical current density of superconductor wires according to the present invention is characterized in that it includes: (a) applying an external magnetic field to the superconductor wires, (b) measuring a magnetization loss of the superconductor wires according to the application of the external magnetic field, (c) normalizing the measured magnetization loss, and then calculating a fully-penetration magnetic field of the superconductor wires according to the normalized magnetization loss, (d) calculating a critical current density of the superconductor wires according to the calculated fully-penetration magnetic field. Therefore, the critical current density of parallel superconductor wires such as stacked superconductor wires may be measured without applying current to the superconductor wires directly.