37results about "Measurement instrument magnets" patented technology

The invention discloses an alternating current sensor based on a magnetoelectric laminar composite and with a C-type magnetic ring, which belongs to the field of alternating current sensors. The alternating current sensor is a closed cyclic structure composed of the C-type magnetic ring and a measuring module in the gap of the C-type magnetic ring. The C-type magnetic ring and the measuring module are detachably connected through a supporting layer. The measuring module is in a layered structure and comprises the magnetoelectric laminate material in the middle and a permanent magnet layer arranged symmetrically in the thickness direction of the magnetoelectric laminate material. The cross section of the C-type magnetic ring and the permanent magnet layer completely cover the cross section of the magnetoelectric laminate material. The sensor is simple to use, can be loaded and unloaded at any time without changing the topology of a line to be measured, and is a passive device. The output voltage of the sensor has a good linear relationship with the amplitude of current to be measured. The alternating current sensor can realize wideband measurement and has good anti-interference ability.

Methods for fabrication of leading edge shields and tapered magnetic poles with a tapered leading edge are provided. The leading edge shield may be formed by utilizing a CMP stop layer. The CMP stop layer may aid in preventing over polishing of the magnetic material. For the tapered magnetic poles with a tapered leading edge, a magnetic material is deposited on a planarized surface, a patterned resist material is formed, and exposed magnetic material is etched to form at least one tapered surface of the magnetic material.

The invention provides a quick connector of a magnetic type electrical test wire, relates to a magnetic type quick connector device and aims to solve the problem that an existing electrical test wire is complicated in connection operation and easily causes dropping and mistaken touch and the like. The quick connector of the magnetic type electrical test wire comprises an insulating sheath, attractive magnetic steel, a connecting bolt, a press spring, a copper contact column and a nut, wherein one end of the press spring is arranged on the surface of a bolt cap of the connecting bolt, the other end of the press spring is connected with the copper contact column, the connecting bolt is plugged into the attractive magnetic steel, a bolt rod of the connecting bolt is tightly sleeved with the nut, a copper contact is exposed out of the end face of the attractive magnetic steel, and the outer surface of the attractive magnetic steel is coated with the insulating sheath. A magnetic attraction function of the quick connector is utilized to complete fastening for guaranteeing connection, and good contact is guaranteed by utilizing pressing of the spring. Accordingly, the shortcomings existing in the test wiring process are overcome, and the working efficiency of an electric test is improved.

The invention discloses a high-frequency current sensor. The high-frequency current sensor comprises two metal shielding housings which are split; a groove is arranged in the inner wall of each metal shielding housing. A semi-ring type magnetic core is embedded in each groove. A ring-type slit through which the magnetic force passes is arranged in each groove. A gap is left between each semi-ring type magnetic core and the corresponding groove and is filled with insulation materials. When two ends of one metal shielding housing are connected with two ends of the other one metal shielding housing, the two semi-ring type magnetic cores in the metal shielding housings form a ring type magnetic core. Two segments of coils are wound on one of the semi-ring magnetic core in opposite winding directions. According to the invention, by introducing the difference amplifying principle into the high-frequency current sensor and taking full advantage of the characteristics of capability of effectively eliminating interference and amplifying original signals twice of a difference circuit, the anti-interference ability of the high-frequency current sensor is effectively improved and sensitivity of the sensor is greatly improved.

The present invention relates to the sensing of a magnetic target. The apparatus (110) comprises a magnetic target (120) for generating a magnetic field that is uniform and concentric about a central axis of the target (120); an array (140) of three-axis digital magnetic compasses (210) for sensing the magnetic field; and a processor for finding intersection points of vectors from the compasses to the target (120). The vectors lie in a global X-Y plane that is normal to the central axis. Each vector indicates a direction of sensed magnetic field from one of the compasses to the magnetic target (120).

The invention discloses an array testing device. The array testing device is used for removing particles possibly generated when a probe pin is pressed on a corresponding electrode on a glass panel or when an electric signal is applied from the probe pin to the electrode.

The present invention involves an electrical verification method that detects moisture within the cavity of the semiconductor or micro-machined device. The method affects an increase in the time for sufficient water vapor to remain within an unsealed device, so that instability in the diode can be measurable over a longer period of time. The method begins with the step of forming at least one reservoir on at least one of the device wafer and the capping wafer. The at least one reservoir connects to at least one diffusion channel, which is in communication with at least one reservoir port. The method further includes the steps of forming a PN junction diode adjacent to the at least one reservoir port; bonding the device wafer with the capping wafer to form a cavity; and electrically testing the PN junction diode as an indication of the presence of moisture within the cavity. The device assembly of the present invention includes a capping wafer bonded on a device wafer to form a cavity; at least one reservoir including at least one diffusion channel for receiving a liquid and retaining moisture. The at least one diffusion channel communicates with at least one reservoir port, which is open into the cavity. An exposed PN junction diode is provided adjacent to the at least one reservoir port, and a pair of metal pads is connected to the exposed PN junction diode.

The present invention relates to an emergency signal transmitting and receiving device of a crime and disaster preventing system. The present invention also relates to a device for sensing a state of a cable. The present invention has the advantages that an appropriate action to the emergency state can be achieved. The first embodiment of the present invention can be achieved by a cable sensor, a database and an interpreting device etc. of the emergency state. The second embodiment of the present invention can also be achieved by a simple structure of a permanent magnet, a transformer and an interpreting device etc. of the emergency state.

Disclosed is a levitation type supporting unit interposed between an object to be supported and an installing surface so as to support the object respective to the installing surface. The supporting unit includes a lower magnet part having a lower magnet; an upper magnet part arranged at an upper part of the lower magnet part while having an interval in such a manner as to be spaced from the lower magnet part, the upper magnet part having a surface facing the lower magnet, a polarity of the surface being equal to a polarity of a corresponding surface of the lower magnet; an upper fixing cap being assembled with the upper magnet part so as to allow the upper magnet part to be elevated; a lower fixing cap which is connected with the upper fixing cap and is assembled with the lower magnet part; and a fixing part including a connecting part formed at one side between the upper fixing cap and the lower fixing cap, the connecting part connecting the upper fixing cap and the lower fixing cap while having an interval in such a manner that space formed between the upper fixing cap and the lower fixing cap is exposed, the fixing part preventing the upper magnet part from escaping from an upper position of the lower magnet part. The supporting unit supports the object respective to the installing surface in a levitation manner so that vibration of the object to be supported and noises caused by the vibration can be reduced, and vibrations and noises, which are generated between floors in residential space such as an apartment, can be minimized. Also, the supporting unit allows an observer to directly identify a state of the object being supported in the levitation manner by the naked eyes.

Embodiments of the present invention provide an adjustable magnetic ring. The adjustable magnetic ring includes a housing and a plurality of semi-magnetic cores disposed in the housing; the housing includes an upper portion and a lower portion; every two semi-magnetic cores are coupled to form a complete magnetic core, and the complete magnetic cores are arranged in the housing; one ends of the upper portion and the lower portion of the housing are hinged, and fasteners are arranged on the other ends of the upper portion and the lower portion; the upper portion and the lower portion are fastened together through the fasteners. The adjustable magnetic ring is adjustable in magnetic ring material, cross-sectional area, and length. The most effective magnetic ring for noise is determined according to the magnetic ring material, the cross-sectional area, and the length. The upper portion and the lower portion of the housing are hinged through plastic connection members, and the flexibilityof the housing is improved. The other ends of the upper portion and the lower portion of the housing are connected through the fasteners, the upper semi-magnetic ring and the lower semi-magnetic ringcan be lap-jointed well to form a whole body, and gaps between the upper and lower magnetic cores can be prevented.

A circuit probing system and a circuit probing device thereof are provided. The circuit probing device includes a probe card and a protective lid. The probe card is provided with a pin area, a bore hole and a first magnetic attraction member disposed in the bore hole. The protective lid is provided with a second magnetic attraction member. When the protective lid covers the probe pin area, and the second magnetic attraction member inserts into the bore hole, the protective lid is fixed on the probe card as the first magnetic attraction member and the second magnetic attraction member magnetically attract with each other.

Provided is a jig enabling detachment and attachment of a probe head from and to an electric connecting apparatus without using a special holding device. A jig (50) is applied to an electric connecting apparatus (10) electrically connecting a device under test to a testing apparatus for the device under test. The electric connecting apparatus includes a wiring substrate (22) and a probe head (28) secured to the wiring substrate with a plurality of set screws (26) and including a plurality of probes (34) made of a magnetic body. The jig (50) includes a plate (52) and a magnet (54) attached to the plate. The plate can detachably be attached to the probe head, and the magnet is opposed to a lower end portion (34b) of each of the probes.

The invention discloses a device and method for passive current detection in a low-frequency mechanical vibration environment, and the device comprises a double-core wire, a wire buckling cover, an adjustment device top knob, a cantilever beam fixed end sliding block, a lead screw, a side scale line, a cantilever beam sensor adjustment device, and the like. An expression formula of vibration interference force under a piezoelectric cantilever beam spring damping model is deduced according to a completely differential model, a measuring device is designed to enable the interference vibration force and the electromagnetic force to be in the same direction, and the current value under the disturbance environment is calculated by reading the readings of piezoelectric patches in two cantileverbeam sensors. The model amplifies the voltage amplitude by two times and completely eliminates the low-frequency mechanical vibration interference in the double-core wire direct current measurement process, so that the measurement is accurate.

The invention discloses a passive lightning current sensor, which comprises a shell. A fixing ring matched with a wire is arranged on the upper side of the shell, a supporting table is arranged on the inner side wall of the shell, magnets are symmetrically arranged on the two sides of the supporting table, and a magnetoelectric structure is fixedly arranged in the middle of the supporting table; the magnet is parallel to the axis direction of the connecting hole of the fixing ring; the magnetoelectric structure comprises two mutually overlapped magnetostrictive sheets, and a piezoelectric sheet is arranged between the magnetostrictive sheets. The problem that in the prior art, a device for effectively measuring outdoor lightning current is lacked can be solved, and measurement can be completed without an external power supply; the performance of the sensor can be adjusted by using a bias magnetic field; an opening-closing type detachable structure is used for solving the problem that an existing device cannot be detached after being installed; and the structure is simple, reliability is high and accuracy is good.

The invention discloses a partial discharge detecting sensor and a manufacturing method thereof. The partial discharge detecting sensor comprises a first half-ring magnetic core piece and a second half-ring magnetic core piece, wherein the second half-ring magnetic core piece is arranged corresponding to the first half-ring magnetic core piece, so as to surround an element to be detected in the circumferential direction; and the first half-ring magnetic core piece and / or the second half-ring magnetic core piece comprises at least two magnetic core blocks which are connected with each other. The first half-ring magnetic core piece and / or the second half-ring magnetic core piece is composed of the at least two magnetic core blocks which are connected with each other, so as to solve the problems that a partial discharge detecting sensor for equipment to be detected with large cross section diameter in the prior art is difficult to produce and manufacture, has high production and use costs, is difficult to realize mass production and even cannot be produced and manufactured.

The invention relates to a 3*3m power frequency magnetic field generator. The 3*3m power frequency magnetic field generator comprises a control unit, the control unit controls a converter so as to achieve the aim for controlling an output magnetic field, a linear stabilized voltage supply supplies working voltage for the control unit, the input end of the control unit is connected with an input module, and the output end of the control unit is connected with a display unit. The 3*3m power frequency magnetic field generator is characterized in that the converter is connected with two sets of 3*3m power frequency magnetic field coils, and the distance between the two sets of power frequency magnetic field coils is adjustable within 1-3m. Compared with the prior art, the 3*3m power frequency magnetic field generator has the following advantages that through the two sets of 3*3m power frequency magnetic field coils between which the distance is adjustable within 1-3m, the magnetic field range which is far more than that of 1*1m coils is generated, and the condition is provided for testing power frequency magnetic field resistance interference by large-scale equipment through an immersion method.

The invention discloses a flying probe testing device and a rapid positioning device thereof. The flying probe testing device comprises a flying probe testing machine body opposite to a to-be-tested circuit board, wherein the flying probe testing machine body is used for bearing the flying probe rapid positioning device, one end of the flying probe testing machine body facing the to-be-tested circuit board is fixedly connected with a bottom plate, and a plurality of element pins needing to be tested are arranged on the circuit board to be tested; a slidable test circuit board which is arranged on the upper surface of the bottom plate, wherein a plurality of test pins used for testing the element pins are mounted at one end, facing the circuit board to be tested, of the test circuit board; and a sliding mechanism which is arranged between the bottom plate and the test circuit board. The device is simple in structure, and has a better error-tolerant rate, so that circuit boards with different designs can be well detected. The error range of the flying probe testing machine can be automatically detected in the pin detection process, so that the data can be provided for device maintenance.

A magnetic anchor base assembly can include a magnetic coupling component and magnetic sub-components integrated therewith. Each magnetic sub-component can be configured to magnetically couple with a metal band that is configured to couple with a test probe.

The invention particularly relates to a distributed magnetic ring structure, which comprises a first magnetic ring body, a second magnetic ring body and a cable, wherein the first magnetic ring body and the second magnetic ring body are connected with each other, the cable penetrates through the first magnetic ring body and the second magnetic ring body, an inner magnetic ring sleeve is arranged between the first magnetic ring body and the second magnetic ring body, is located on the cable side, and is electrically connected with a communication board, the communication board comprises a detection module, a data storage module and an RS485 communication module, the detection module, the data storage module and the RS485 communication module are sequentially connected, the inner magnetic ring sleeve is electrically connected to the detection module, and the data storage module is used for recording state parameters output by the detection module and allowing the communication module to read the state parameters. According to the invention, the first magnetic ring body, the second magnetic ring body and the inner magnetic ring sleeve are combined and installed on the cable in a distributed manner, so that the reliability can be improved, and the utilization rate of the existing power transmission infrastructure is improved; and the communication board plays a role in providing real-time line information;.

The invention discloses a zero offset suppression method based on magnetized micro-asymmetric magnetic core group mirror image matching, which comprises the following steps of: calculating a magnetization characteristic evaluation index IKi of each magnetic core by utilizing the characteristics of a hysteresis loop; then, calculating the magnetization characteristic evaluation index difference value between any two magnetic cores, and forming a difference value matrix Dev; obtaining a matching difficulty coefficient Di of each magnetic core according to the difference matrix Dev and an zero offset target IL; and finally, forming a magnetic modulator from two magnetic cores with similar magnetization characteristics in a large batch of magnetic cores in sequence by utilizing the difference matrix and the matching difficulty coefficients. According to the method, the matching difficulty coefficient of each magnetic core is calculated, and the magnetic core with the maximum matching difficulty coefficient is preferentially selected for matching each time, so that the matching result of a large batch of magnetic cores can be obtained in a very short time, the zero offset of the magnetic modulator can be controlled below an expected target, and a foundation is laid for improving the resolution and accuracy of the magnetic modulator.

Systems and methods for monitoring the condition of structural systems such as bridges and roadbeds. The systems include a magnetometer mounted on a structural element of the structural system; and a magnet mounted on a surface adjacent the structural element so that the magnetometer is positioned within a magnetic field of the magnet. The magnetometer measures characteristics of the magnetic field of the magnet. Position of the structural element is determined from measured characteristics of the magnetic field and a predetermined relationship between the characteristics of the magnetic field and the position of the structural element within the magnetic field. The position information determines other parameters, such as the deflection of the structural element in three-dimensional space, and the response of the structural element to dynamic loading.

The invention relates to the technical field of smart phone accessory detection equipment, and discloses an efficient and intelligent smart phone accessory detection device which comprises an input shaft. A first connecting piece is rotatably connected to the outer side of the input shaft, an electric connecting block is movably installed on the outer side of the first connecting piece, and a contact is movably connected to the outer side of the electric connecting block. The outer side of the contact is movably connected with a first shell, and the bottom end of the first shell is movably connected with a first coil. Through connection of the input shaft, the first connecting piece and the first coil, the problem that an existing smart phone accessory is large in energy consumption in the actual detection process is solved, defects existing in a use process of a produced testing machine are overcome through electromagnetic induction control, control is easier during reciprocating detection, and a stroke limiting device is arranged on the testing machine. When an electromagnetic device is used for pushing, accessories can be effectively prevented from being damaged, the detection efficiency is improved, and a test result cannot be influenced.