204 results about "Induction loop" patented technology

An improved method of sensing strain allows measurements of stress, torque, vibration and other loads imposed on a body without physical contact between the body/sensor and the monitoring equipment. An induction loop is at least partially comprised of a magnetostrictive material with a non-linear current-voltage relationship. An excitation device such as a coil is used to induce an AC response in the sensor. The non-linear response to the induced current is received by a sensing device such as a sensing coil, and the output thereof is filtered. The excitation device and sensing device are located in operative proximity to the sensor, but need not be in contact therewith, allowing easy measurement in small spaces, under harsh conditions, or of moving bodies such as drive shafts. The non-linear response of the sensor induces easily detectable harmonics of the base frequency of excitation. These harmonics may advantageously be measured as well.

A cursor input device with dual input modes is provided, including a control computing module, a coordinate sensing module, a first analog multiplexing module, a first signal processing module, a second analog multiplexing module and a second signal processing module, where the coordinate sensing module further including a touch sensing loop unit and an electromagnetic sensing loop unit. The control computing module at least includes a microprocessor. The control computing module uses the first analog multiplexing unit and the first signal processing module to enable the electromagnetic sensing loop unit to perform signal scanning and processing, and uses the second analog multiplexing unit and the second signal processing module to enable the touch sensing loop unit to perform signal scanning and processing. In this manner, the user can use either touch input mode or electromagnetic pen input mode to control the cursor of the present invention to execute various the application software or operating system.

The present invention relates to security label (12) for securing or authenticating goods or services or a security document. Currently radio frequency ID cards, having an inductive loop and a microchip containing security information, are used. However, such RF ID cards are expensive to manufacture. Therefore it is proposed to use a security label or document (12) including a terahertz image or tag (14, 15, 76) which may beta hologram. Security information can then be read by reflection or transmission of terahertz radiation which is not visible to the unaided eye. The terahertz image or tag may be covered by a material (66, 68) opaque to visible light, but transparent or transmissive of terahertz wavelengths, making it difficult for potential fraudsters to investigate the terahertz image. A method of making such a security label or document, a security or authentication method and system using terahertz radiation are also disclosed.

The invention relates to a method for detecting the passage by a vehicle of a determined point for monitoring on a road, wherein from a remotely situated location a radar beam is transmitted continuously to the point for monitoring, reflections from the transmitted radar beam are received at the remotely situated location, and it is determined from the received reflections that the vehicle is passing the point for monitoring. The radar beam can herein be transmitted at an acute angle to the travel direction of the passing vehicle. The detection can be used to activate a red-light camera, to measure the speed of the vehicle or measure the traffic intensity, without sensors, for instance induction loops, having to be arranged in the road for this purpose. The invention further relates to a system for performing this method.

An intra-pericardial medical device is provided that comprises a lead body having a proximal portion, a distal end portion, and an intermediate portion extending between the proximal portion and the distal end portions. An intra-pericardial medical device further includes the control logic housed with the lead body and an energy source housed within the lead body. A stimulus conductor is included and extends along the lead body. An electrode is joined to the stimulus conduct near the distal end portion, where the electrode configured to deliver stimulus pulses. A telemetry conductor is provided within the lead and extends from the proximal portion and along the intermediate portion of the lead body. The telemetry conductor is wound into a series of coil groups to form inductive loops for at least one of receiving and transmitting radio frequency (RF) energy.

The invention discloses a magnetic levitation train positioning and speed measuring system and method and a magnetic levitation train. The magnetic levitation train positioning and speed measuring system comprises a train-mounted coil, an induction loop line and a ground control unit. The train-mounted coil is installed on a body of the magnetic levitation train, the induction loop line and a magnetic levitation train synchronous linear motor traction winding are jointly laid on a track, and the winding manner of the induction loop line is the same as that of the magnetic levitation train synchronous linear motor traction winding. When high-frequency alternating current enters the train-mounted coil, an alternating magnetic field is formed on the periphery of the train-mounted coil, and the train-mounted coil is used as an excitation source of the alternating magnetic field. The induction loop line is used for generating induction voltage signals when the train-mounted coil moves along the induction loop line. The ground control unit is used for obtaining position and speed information of the magnetic levitation train according to the induction voltage signals sent by the induction loop line. By the adoption of the system, the structure of the system is simplified, the accuracy and reliability of the magnetic levitation train positioning and speed measuring system are improved, and the position and speed information of the magnetic levitation train is detected easily, conveniently and rapidly.

The invention provides a method and a system for detecting illegal left-and-right steering of a vehicle at traffic intersection. The method comprises the following steps of: decoding monitoring video streaming in real time from the traffic intersection so as to obtain a video image; distinguishing vehicles passing through the traffic intersection and detecting the moving trails of the vehicles; and presetting at least one virtual position on a steering lane of the video image so as to judge that the vehicle has illegal steering when the steering is not allowed by a signal lamp at the traffic intersection and the moving trail of the vehicle passes through the virtual position. According to the invention, by adopting the method for intelligently analyzing the video, the virtual loop is drawn on the monitoring video, the moving trail of the vehicle is tracked and analyzed through characteristics, and whether the vehicle has illegal steering is judged through the preset virtual loop so as to reduce the workload of manual check and control; and simultaneously, as the touch capture is achieved through the video virtual loop, the way that an induction loop is embedded in a pavement in the traditional technology is avoided, and the pavement does not need to be dig.

The invention provides a non-contact magnetic-levitation train positioning device and method and a magnetic-levitation train. The non-contact magnetic-levitation train positioning device comprises a transmitting antenna, a plurality of pairs of induction loop lines and a signal processing unit. The transmitting antenna is arranged on a body of the magnetic-levitation train. The induction loop lines are laid on a rail. When the transmitting antenna is connected with high-frequency alternating current, an alternating magnetic field is formed surrounding the transmitting antenna and used as an excitation source of the alternating magnetic field. The induction loop lines are used for generating induction voltage signals when the transmitting antenna moves along the induction loop lines. The signal processing unit is used for obtaining the position information of the magnetic-levitation train according to the induction voltage signals sent by the induction loop lines. According to the non-contact magnetic-levitation train positioning device, the transmitting antenna is arranged on the train, the induction loop lines are laid on the rail, and the position information can be transmitted without additional train-ground communication equipment, so that the structure of a whole train system is simplified, the system construction cost is lowered, and the reliability of the system is improved.

Systems and methods are provided for reducing heating within pacing/sensing leads of a pacemaker or implantable cardioverter-defibrillator that occurs due to induced loop currents during a magnetic resonance imaging (MRI) procedure, or in the presence of other sources of strong radio frequency (RF) fields. For example, bipolar coaxial leads are described herein wherein the ring conductor of the lead is disconnected from the ring electrode in response to detection of MRI fields so as to convert the ring conductor into an RF shield for shielding the inner tip conductor of the lead so as to reduce the strength of loop currents induced therein and hence reduce tip heating. Techniques are also described herein for selectively disconnecting the tip electrode of the lead during an MRI procedure, except during actual delivery of pacing pulses, so as to permit delivery of individual pacing pulses to pacemaker dependent patients during the MRI. Still other techniques describe the use of both RF shielding and tip switching.

The invention discloses a traffic flow prediction method based on the spatial copula theory. The traffic flow prediction method comprises the steps of obtaining the geographical positions of magnetic induction loop devices in a road section and the traffic flow data counted by the magnetic induction loop devices, calculating the distances between each two magnetic induction loop devices based on the geographic positions of the sample points, determining a correlation function model suitable for the samples according to semivariable functions, conducting edge distribution fitting through the sample traffic flow, selecting a copula model to calculate the correlation coefficient of traffic flow based on distance, so as to verify the feasibility of the selected copula model, and calling the model for prediction. The spatial characteristics of traffic flow are taken into consideration, the traffic flow distribution types are explored, and high precision and reliability are ensured.

The invention relates to a rail transit signal system which is used for realizing bidirectional communication between a ground region control center and on-vehicle ATP and ATO equipment, in particular to a symmetric induction loop bidirectional communication system. The system comprises a loop line cable, on-vehicle equipment and ground equipment. The loop line cable is symmetrically paved along the center of two steel rails; crossing points are arranged at every distance; the ground equipment comprises transmitting equipment and receiving equipment which are respectively connected with the region control center by buses; a coupling transformer is arranged between the transmitting equipment and the receiving equipment; and the output of the coupling transformer is connected to a beginning matching device of the loop line cable through a feeder cable. The system uses a transformer-coupled circuit so that signal transmission distance is doubled; and via coupling counteracting, after the signal which is received by the transformer-coupled circuit and returned from the loop line passes through a filter circuit, a ground-to-vehicle signal is substantially filtered and the signal to noise ratio of a vehicle-to-ground signal is greatly improved.

Disclosed is an inventory control system or parking space detector including an inductive loop technology that is either embedded in the concrete or located atop the concrete, or any other feasible method of setting an inductive loop. By monitoring the change in inductance of the magnetic field that is generated by the loop as cars of various sizes and weights enter the looped area, a determination of whether or not the inventory is controlled or the parking spaces are all full is made when the inductance value reaches a certain predetermined level. This predetermined level will be determined by calibration in the initial installation in order to determine the exact inductance values when a group of parking spaces are full.

A method for identification, geolocation, validation and transactional processing via 802.11b/g/n frequencies involving a radio, most often a commercial mobile electronic device and a receiver, most often a wireless router connected to a computer server. The radio being physically located next to the agent, in some cases inside a method of conveyance and in some cases not, the radio being geographically separated from the receiver. Validation of agent occurs at a moment temporally segregated from moment of granting access to the vendor access control zone.

An example embodiment of this invention is the use of a cell phone to transact toll payment on a toll road. In this embodiment, the vehicle operator has inside the vehicle an cell phone in the on position that is executing client software that is in communication with server software executing on a server located at a toll plaza. Communication between client and server happens exclusively through wireless fidelity frequencies. Validation occurs by comparing signature information from the cell phone with database records and ensuring the cell phone is the property of a customer with sufficient funds in the account. Simultaneous processes locate the moving vehicle by virtue of trilateration on the cell phone inside the vehicle. This is accomplished by converting received signal strength patterns into distances between the cell phone and at least three wireless routers. Upon completion of funds transfer out of the customer's account and into the account of the toll plaza operator—the gate can now be opened. This is triggered by a paid vehicle resting on an induction loop in a single toll booth that triggers gate opening.

The invention relates to a propulsion device comprising a gas ejection nozzle and an injection chamber for injecting at least one propellant fluid. According to the invention, the device has an induction loop which surrounds a zone of the nozzle and also an electricity generator to feed said induction loop, in particular under drive from a heat engine whose heat source is a nuclear core and whose heat sink is a cryogenic liquid which is subsequently used for propulsion.

The invention discloses a swing type generating device and a buoy, and provides a generating device with a novel structure. The swing type generating device comprises a fixing plate, a spherical cover, a universal joint, a swing hammer, a swing frame, permanent magnets and magnetic induction loops, wherein the spherical cover comprises a mounting part and a spherical part, N groups of magnetic induction loops are uniformly arranged on the inner wall of the spherical part, N represents an even number, and each group includes multiple magnetic induction loops which are distributed along the vertical direction; the rotating center of the universal joint is located at the spherical center of the spherical part, and the swing hammer penetrates through a gap in the lower end of the spherical part, so that a heavy hammer on the swing hammer is located at the lower part; and the swing frame comprises a sleeve and brackets, an arc-shaped plate is fixed at the outer end of each bracket, the circle centers of the arc-shaped plates and the circle center of the spherical part are arranged, and multiple permanent magnets are uniformly arranged on the outer surface of each arc-shaped plate. According to the swing type generating device, waves in ocean can be fully utilized for generating power.

The invention provides an integrated electromagnetic and capacitance induction input device which comprises a base plate, a control element and at least one signal processing element arranged on the base plate, wherein the base plate comprises an electromagnetic induction loop and a capacitance induction loop. In the invention, the capacitance induction touch control element is arranged below the electromagnetic induction loop and the electromagnetic induction loop is arranged above the capacitance induction touch control loop through a wiring way of matching loops by arranging the electromagnetic induction loop and the capacitance induction touch control loop in different layers of the base plate in a staggered wiring manner. While the take-up area of the electromagnetic induction loop is wired at the periphery of the capacitance induction loop, even if the electromagnetic induction loop take-up and wiring are dense, the lower capacitance induction is not disturbed to cause poor induction sensitivity.

A passive radio frequency identification (RFID) sensor is provided. This passive RFID sensor includes an inductive loop, a processing module, and a wireless communication module. The inductive loop has an inductive loop impedance that may vary with an environment in which the inductive loop is placed. The processing module couples to the inductive loop and has a tuning module that may vary a reactive component impedance coupled to the inductive loop in order to change a system impedance. The system impedance includes both the inductive loop impedance and the reactive component impedance. The tuning module then produces an impedance value representative of the reactive component impedance. A memory module may store the impedance value which may then later be communicated to an RFID reader via the wireless communication module. The RFID reader may then exchange the impedance value representative of the reactive components of impedance with the RFID reader such that the RFID reader or another external processing unit may process the impedance value in order to determine environmental conditions at the inductive loop. These environmental conditions may include but are not limited to temperature, humidity, wetness, or proximity of the RFID reader to the passive RFID sensor.

A sealing device for sealing non-circular, in particular polygonal, for example tetragonal, hexagonal, octagonal or elliptical, container openings comprises one or a plurality of induction loops (11, 38, 41) for sealing purposes. Containers (2) comprise joined-on closure devices (3) with sealing discs (15) joined onto a sealing edge (14) of the container opening. The induction loops (11, 38, 41) are adapted to the shape of the sealing edge (14) and the spacing between the induction loop (11, 38, 41) and sealing edge (14) is constantly adjustable and selectable.