70 results about "Loop detector" patented technology

A control and management system for defined areas, employs a card reader, vehicle sensing loop detectors and electric eyes, entrance door sensors and operators, truck securement devices, cameras, a control system with memory, and a wireless connection or internet / intranet connection, is provided to produce event log documentation. The event information is readily accessible by management or supervisory personnel, to see all of the recorded information concerning a specified event. Thus, an event can be readily reconstructed after the fact, using all available sensors and other information relevant to a manager or supervisor. An alert can be issued whenever an abnormal or unauthorized event occurs during operations. A QR code reader can be provided which communicates with the system to enable a person carrying the cell phone to scan QR codes at specified locations or on specified items or vehicles.

A control and management system for defined areas, employs a card reader, vehicle sensing loop detectors and electric eyes, entrance door sensors and operators, truck securement devices, cameras, a control system with memory, and a wireless connection or internet / intranet connection, is provided to produce event log documentation. The event information is readily accessible by management or supervisory personnel, to see all of the recorded information concerning a specified event. Thus, an event can be readily reconstructed after the fact, using all available sensors and other information relevant to a manager or supervisor. An alert can be issued whenever an abnormal or unauthorized event occurs during operations. A QR code reader can be provided which communicates with the system to enable a person carrying the cell phone to scan QR codes at specified locations or on specified items or vehicles.

A control and management system for defined areas such as loading docks, fire stations, and other designated defined areas, employs a card reader, vehicle sensing loop detectors and electric eyes, entrance door sensors and operators, truck securement devices, cameras, a control system with memory, and a wireless connection or internet / intranet connection, is provided to produce event log documentation. The event information is readily accessible by management or supervisory personnel, to see all of the recorded information concerning a specified event. Thus, an event can be readily reconstructed after the fact, using all available sensors and other information relevant to a manager or supervisor. This aids in locating lost packages, documents security procedures, preventing or detecting thefts and vandalism, and for other purposes. An alert can be issued whenever an abnormal or unauthorized event occurs during operations. A QR code reader can be provided for a cell phone with picture-taking capability, which communicates with the system to enable a person carrying the cell phone to scan QR codes at specified locations or on specified items or vehicles.

A method and system for synchronization of detection loops in a multilane environment. A plurality of loop sensors are arranged in a plurality of lanes such that loop sensors in adjacent lanes are mutually contiguous. A simultaneous synchronization signal is sent to each of the plurality of loop detector controllers, where each loop detector controller is in communication with a loop sensor. The signal causes a scheduling of sampling periods for each loop sensor, such that the sampling period of each loop sensor does not overlap with that of a contiguous loop in an adjacent lane.

A digital processor for use in a conveyor belt rip detector, which provides excitation signals at a selected frequency to inverted and noninverted sensor loops on a conveyor belt and then, detects corresponding received signals from the sensor loops. The digital processor then performs FFTs on the corresponding received signals to provide respective received signal frequency spectrums. Next magnitude and phase values of the selected frequency in the respective received signal frequency spectrums are used to determine a qualitative state of the sensor loops. The selected frequency has a lowest detected ambient noise level, and the magnitude value is a normalized magnitude value.

A digital processor for use in a conveyor belt rip detector, which provides excitation signals at a selected frequency to inverted and noninverted sensor loops on a conveyor belt and then, detects corresponding received signals from the sensor loops. The digital processor then performs FFTs on the corresponding received signals to provide respective received signal frequency spectrums. Next magnitude and phase values of the selected frequency in the respective received signal frequency spectrums are used to determine a qualitative state of the sensor loops. The selected frequency has a lowest detected ambient noise level, and the magnitude value is a normalized magnitude value.

The present invention provides a smart shopping cart based on RFID, a shopping system based on RFID and an application method thereof. The smart shopping card comprises a cart body, and a touch screen, a microprocessor, a vehicle unit, a RFID identification antenna and a storage battery installed on the cart body; the storage battery, the RFID identification antenna and the vehicle unit are connected with the microprocessor; and the shopping system includes the smart shopping cart, a roadside unit, a loop sensor and a control center. The smart shopping cart based on RFID, the shopping system based on RFID and the application method thereof employ the vehicle unit, the roadside unit and the loop sensor for cooperation to make the payment process simple, and convenient and rapid compared to the traditional POS and cash payment; and moreover, through adoption of the RFID identification technology, the smart shopping cart based on RFID, the shopping system based on RFID and the application method thereof realize the automatic identification of goods information with no need for manually inputting numbers of goods and performing laser scanning so as to improve the efficiency.

A pre-fabricated ferromagnetic loop having a footprint characterized by a continuous wire shaped according to a predetermined planar pattern. In some embodiments, the predetermined planar pattern can be multiple contiguous polygons within a larger footprint used for establishing a sensor for the detection of moving vehicles. The footprint may include one of a triangle, a square, a rectangle, a rhombus, a parallelogram, an ellipse, or a circle, and / or other shapes or configurations. Similarly, each of the multiple contiguous polygons may include one of a triangle, a square, a rectangle, a rhombus, a parallelogram, and / or other shapes or configurations. A loop sensor housing is arranged to enclose a continuous loop sensor wire configured in the predetermined planar pattern. The prefabricated loop sensor is inserted in a groove web pre-cut in a receiving medium to match the predetermined planar pattern.

The invention provides a high-voltage interlocking loop and a high-voltage interlocking loop detector, and relates to the technical field of high-voltage interlocking loop detection. A diagnosis controller is connected with the high-voltage interlocking loop and used for detecting the high-voltage interlocking loop, obtaining voltage information according to a diagnosis signal and an equivalent resistor and diagnosing fault state information according to the voltage information. The high-voltage interlocking loop is characterized in that the input end of one corresponding high-voltage connector is connected with a first low-value resistor and a first high-value resistor, the output end of the corresponding high-voltage connector is connected with a second low-value resistor, one end of a ground resistor is connected with a third low-value resistor and a second high-value resistor, and the other end of the ground resistor is grounded; the ground resistor, the low-value resistors and the high-value resistors are combined into the equivalent resistor through a loop resistor according to the loop connection state, and external connection with a power supply is achieved through the high-voltage connectors. The state of each high-voltage connector and the fault section of the high-voltage interlocking loop can be judged according to different pieces of voltage information, and the fault detection efficiency can be improved.

A method and system for synchronization of detection loops in a multilane environment. A plurality of loop sensors are arranged in a plurality of lanes such that loop sensors in adjacent lanes are mutually contiguous. A simultaneous synchronization signal is sent to each of the plurality of loop detector controllers, where each loop detector controller is in communication with a loop sensor. The signal causes a scheduling of sampling periods for each loop sensor, such that the sampling period of each loop sensor does not overlap with that of a contiguous loop in an adjacent lane.

The invention discloses an optical fiber sensing probe for detecting gas and liquid and a preparation method of the optical fiber sensing probe. An adopted sensing optical fiber is provided with a micro-hole-channel structure, micro-holes are formed in one end side face of the sensing optical fiber, the other end side face of the sensing optical fiber is plated with a reflecting film, and then the optical fiber sensing probe for detecting the gas and liquid is formed. The optical fiber sensing probe can be combined with a Y-shaped optical fiber, an optical loop detector, an optical coupler and the like to form an optical fiber sensor, and can also be combined with a light source and a detector to form an optical fiber sensing system. The optical fiber sensing probe has the advantages that the integration degree is high, machining is easy, a sample pool is located inside the optical fiber, signal stability is high, and the length of a sensing section is adjustable. The optical fiber sensing probe can be used for detecting the gas and liquid in the various kinds of fields of environment detection, food detection and medical detection.

The invention relates to a method for detecting and controlling free loops by thin-strip continuous casting, which comprises the following steps that: infrared loop detectors are arranged at front and rear end points of the loops; angles alpha 1 and alpha 2 corresponding to the loop height at a central point of the width of a casting strip are measured by the loop detectors simultaneously to calculate a real value h of the loop height of the casting strip; after the loops are formed and reach a set target h0, the speed of pinch rollers is consistent with that of a cooling roller, a value of the loop quantity is constant basically, and the speed of the pinch rollers is changed correspondingly according to the change of the loop quantity in the process of forming the loops so as to form closed loop control; and the loop height h is changed by the change speed v of the pinch rollers, and the speed change rate delta v is determined according to the actual loop height and real-time speed of strip steel. In the method, an included angle between the forward direction of the strip steel at an outlet (a nip point) of the cooling roller and a vertical casting center line is kept within an ideal range in which cracks cannot be generated on the strip steel when the loops are changed due to the change of a thin-strip continuous casting process so as to prevent the quality defect of the casting strip due to the change of the loops and maintain casting continuity.

The invention discloses a detection system for high-speed wire rod steel heaping and a judgment method of the detection system. The detection system comprises a PLC control system, detection loops, loop detectors and accident shears. The loop detectors are mounted on the detection loops. The detection loops are correspondingly mounted on a pre-finishing mill group and a finishing mill group of a rolling production line. The loop detectors and the accident shears are connected to the PLC control system through circuits. The detection system for high-speed wire rod steel heaping and the judgment method mainly aim at the steel heaping failure of a segment from a pre-finishing mill to a finishing mill in the large-scale steel rolling process; and in the type of steel heaping failure, the finishing line failure cannot be judged in time, excessive steel heaping is caused, so that whether steel heaping happens or not is judged by detecting the loop quantity between the pre-finishing mill and the finishing mill, accordingly the judgment can be made in advance, the judgment is precise, and the failure treatment time is shortened.

The invention relates to the technical field of interferometry, and discloses a heterodyne interference optical path structure based on optical fibers and a laser vibrometer. The optical path structure includes a first optical fiber coupler, an optical fiber frequency shifter, a second optical fiber coupler, an optical fiber loop detector and an optical transceiver, which are connected by opticalfibers and constitute a heterodyne interference loop. The laser vibrometer includes a measuring laser source, a balanced photoelectric detector and the optical path structure. The measuring laser source is connected with the input end of the first optical fiber coupler through an optical fiber, and the balanced photoelectric detector is connected with the output end of the second optical fiber coupler through an optical fiber. Through connection by optical fibers, the characteristics of small size and high reliability are achieved. Through the heterodyne interference optical path, the opticalpath system has high signal-to-noise ratio and anti-interference ability and can be used to measure geometric parameters such as length, displacement, straightness and flatness in the field of precision measurement.

The invention provides an intersection turning vehicle number estimating method and system. The turning vehicle number estimating method comprises the steps that loop detectors are installed at partial intersections, the number of turning vehicles are detected according to different lane functions, and historical data collection and recording are carried out, so that the number of the vehicles which are going to turn is estimated according to the number of the vehicles entering lanes; and for the road sections without the loop detectors, the number of the vehicles are sampled by GPS data statistics of probe vehicles, and according to the similarity among the intersections, the number of the turning vehicles at the intersections having no loop detectors is calculated according to the number of the turning vehicles at the intersections provided with the loop detectors. By adopting the above method, the road basic facility cost can be effectively saved, and the number of the turning vehicles at the intersections can be precisely estimated. The system is designed according to the above method and comprises a loop detector data collection module, a probe vehicle data collection module and a vehicle number prediction module; in addition, the system is easy to operate and maintain and is strong in feasibility.

Provided is a lighting ballast system and method for fluorescent lamps. The system and method utilize a lamp current control loop to control the light level of a fluorescent lamp. The ballast includes an open loop detector that recognizes an open current control loop as an indication of a fault or hazard condition, and causes the ballast to output a safe lamp voltage or no voltage. The fault or hazard condition may be, for example, a very high voltage at the lamp or very low current across the lamp. The ballast also includes a disable circuit that prevents the open loop detector from triggering at times when the loop is expected to be open such as during ignition and maintenance restarting of the lamp.

The invention discloses a traffic speed prediction method, belonging to the field of intelligent transportation. The traffic speed prediction method is characterized by extracting traffic flow data bymeans of a loop detector, using a three-dimensional data matrix constructed by three attributes of flow, speed and occupancy acquired in an entire detection road section as input, performing extraction and weighting operation on spatio-temporal features by means of a convolutional neural network, and finally predicting a traffic speed in a future time period by fusing the spatio-temporal data. Through integrating the traffic data of the entire road section, the traffic speed prediction method can predict the speeds of a plurality of detection points at one time, and improves the efficiency when compared to the single point cycle prediction. In addition, through the fusion of the multi-attribute spatio-temporal features and the weighting operation, the effectiveness of traffic features iseffectively enhanced, and the precision of predicting tasks is improved.

The invention discloses an optical power meter having a wide spectral range and a great measuring range. The optical power meter comprises a photonic superconducting integrated loop detector composedof a superconducting nanowire array and an optical waveguide, wherein the superconducting nanowire array is located on one side of the optical waveguide, each nanowire in the superconducting nanowirearray is spaced apart from the optical waveguide by different distances, and the spacing distance between each nanowire and the optical waveguide is gradually reduced along the propagation direction of the light in the optical waveguide. The optical power meter provided by the invention applies the detector to fundamentally broaden the measurable wavelength range and the measurable power range ofthe optical power meter, and can be widely applied to various optical measurement fields.

The invention relates to a traffic signal control technology and aims to provide a traffic signal control method in urban traffic management. The method comprises the steps of: judging crowding conditions through a loop detector, and triggering demand control if traffic intensity parameters and inflow and outflow rate parameters reach the preset threshold values; screening a reasonable path from each node to crowded section according to a road network topological structure, and obtaining a demand control phase; and calculating an inflow and outflow rate of the crowded section, and determining a compression ratio of the demand control phase. According to traffic signal control method, few data is required, only flow data and occupancy data are required, and the method is low in dependency of the road network topological structure and suitable for a road network with any topological structure. The traffic demand is controlled, so that the traffic flow entering the crowded section is equal to traffic flow pulling out, and the phenomenon that the traffic state of the road section is not worsened can be fundamentally ensured.

A multiplexed audio-video signal transmission system has a camera-equipped intercom which produces a balanced audio-video signal. A twisted pair-wire connected to the intercom transmits a multiplexed signal of audio signal, video signal modulated to a frequency band not overlapping the audio signal frequency, and DC power. The audio signal and video signal are carried in the pair-wire in opposite phase in a balanced condition, and the DC power is carried between the pair-wire. A relay device is inserted in the pair-wire to refine the video signal. Main line branching device and door branching device are provided to branch out the multiplexed signal to a television equipped control unit 17.

The present invention provides an image forming apparatus including an upstream conveying portion, a downstream conveying portion, and a loop detector, wherein the image forming apparatus further includes a driving portion which moves the contact portion to a projecting position where the sheet conveying path is in contact with a conveyed sheet and to a retracted position where the sheet conveying path is not in contact with the conveyed sheet, and a controlling portion which controls the driving portion such that the contact portion is moved from the projecting position to the retracted position before a tip end of a sheet which enters the sheet conveying path from the upstream conveying portion reaches the contact portion.

A delay-locked loop detector detects a control voltage of a delay-locked loop, in which the delay-locked loop generates an output clock signal according to a delay time that is controlled by the control voltage. The delay-locked loop detector includes a voltage detector, a switch, and a counter. The voltage detector detects the control voltage. The switch passes the control voltage to the voltage detector. The counter counts a constant period of time, in which the counter enables the switch to pass the control voltage to the voltage detector after the constant period of time.