95results about How to "Avoid detection blind spots" patented technology

The invention discloses a distributed power source island detecting method based on grid-tied point characteristic harmonic wave voltage measurement. A distributed power source is connected with an inverter, and the inverter and a transformer access power grid make up a distributed power source grid tying system sequentially via an inlet filter. The distributed power source island detecting method includes selecting at least two groups of characteristic harmonic wave times as reference subharmonic waves for island detection according to IGBT (insulated gate bipolar transistor) switch frequency of the inverter; synchronously sampling the voltage between the output end of the inverter and grid-tied points between the transformer and the power grid, and acquiring reference subharmonic wave voltage corresponding to the selected characteristic harmonic times after conversion and disintegration; judging whether the reference subharmonic voltages exceed the preset detection threshold values of the harmonic voltage or not, if yes, judging that island effect occurs when duration time exceeds the preset time limit. The method is reliable and easy to implement and is high in power grid applicability and applicable to actual use of projects.

The invention discloses a mobile phone curved glass typical defect online detection device and method. The online detection device comprises a work-piece transmission device, wherein the work-piece transmission device comprises a transmission guide rail, a plurality of transparent objective tables, a motion control card and a motor, and a rotating table; a plane part detection device, a curve edgedetection device and a R angle part detection device for forming three stations are orderly arranged along a transmission direction of the work-piece transmission device; the online detection methodperforms previous training learning on the background and scratch, burning, edge breakage, pit and like typical defect sample images through a convolutional neural network, and original images collected at three stations are divided into multiple sub-images consistent with the size of the training sample, the segmented sub-images are quickly identified, thereby judging whether the original imageshave defects or judging the defect variety. The scratch, burning, edge breakage, pit and like typical defect sample images can be online detected in real time, and the detection device has the features of being fast, efficient, precise and stable.

The invention discloses an active island detection method of a multi-distributed power supply tied-grid, and relates to the field of power system relaying protection. Non-detection zones of a traditional passive island detection method are effectively solved through the island detection method based on reactive power disturbance; synchronous starting of multi-distributed power island detection is achieved by using judgment of a harmonic break variable. Island detection with mutual matching of multi-distributed power supplies is achieved, effectiveness and flexibility of the island detection method when the multi-distributed power supply tied-grid operates are guaranteed, and technical support is provided for safe and reliable operations of the multi-distributed power supply tied-grid.

The invention relates to the technical field of railway equipment and provides a turnout steel rail damage monitoring method and device. The device comprises a sensor, a monitoring extension, a monitoring host and a data center, wherein the sensor is mounted on a turnout steel rail and transmits collected characteristic data to the monitoring extension; after processing the characteristic data, the monitoring extension transmits processing results to the monitoring host; the monitoring host processes the processing results and performs appointed distribution; the data center manages the entire device and controls a client terminal according to reprocessed data The turnout steel rail damage monitoring device solves the technical problem that, when rail circuits and large rail inspection vehicles are utilized to detecting damage of steel rails, rapidly-developed tiny cracks cannot be identified effectively and accordingly lead to non-detection zones. Further, the turnout steel rail damage monitoring device can effectively identify the tiny cracks on the turnout steel rail to overcome the non-detection zones.

The invention discloses a dual-detection forest fire identification system through a thermal imaging video and an identification method thereof. The identification system comprises a thermal imaging camera, a video camera and a processing unit, wherein both the thermal imaging camera and the video camera are in signal communication with the processing unit; the processing unit comprises a thermal imaging analysis unit and a video image analysis unit and calculates angular points of a heat source image and a video image as well as the affine equation between the thermal imaging camera and the video camera through matching the angular points to realize the mapping between a thermal imaging image and the video image; and the position corresponding to an abnormal heat source can be marked on the video image. The dual-detection forest fire identification system through the thermal imaging video and the identification method thereof are simple and practical, and have high identification accuracy and low missing and false report rate. In addition, the forest fire can be detected in low-speed cruising without adopting the fixed-point detection in a common pre-reserved point mode, the blind area of detection can be avoided, and the practicability is good.

The invention discloses a fuel tank antitheft system, comprising a signal detection circuit, a first controller, a wireless communication transceiving module and a display monitor terminal; the signal detection circuit comprises four infrared sensor modules, the output end of the first infrared sensor module, the output end of the second infrared sensor module, the output end of the third infrared sensor module and the output end of the fourth infrared sensor module are connected respectively with the first controller, the first controller is connected with the wireless communication transceiving module, the first infrared sensor module, the second infrared sensor module and the third infrared sensor module are mounted on a same plane, the fourth infrared sensor module is arranged perpendicular to the plane, a probe of the first infrared sensor module, a probe of the second infrared sensor module and a probe of the third infrared sensor module provide transmitting axes that are mutually 120 degrees angled, and a safety area threshold and an alarm area threshold are arranged in the first controller; the fuel tank antitheft system has the advantages of low rate of false alarm, convenience of operation and high safety.

The invention relates to the technical field of steel rail crack detection devices, and discloses a rail transit steel rail crack detection device which comprises a base. Rollers are fixedly mounted on one side of the bottom of the base, a fixed frame is fixedly connected at the bottom of the base, a movable shaft is movably connected on the front of the fixed frame in a sleeving manner, a steel rail wheel is fixedly connected outside the movable shaft in a sleeving manner, a cross plate is fixedly connected in the middle of the bottom end of the base, a movable groove is formed in the front of the cross plate, and a movable block is movably connected in the movable groove in a sleeving manner. The rail transit steel rail crack detection device is provided with the movable block, a movablespring, a fixed bolt, a fixed hole, a slider, a connecting rod and a fixed nail which are matched, a ultrasonic probe can be adjusted according to detection requirements in the detection process of asteel rail, so that a detection range is widened, a non-detection zone is avoided, the detection effect of the device is improved, an adjusting process is simple and convenient, and time and labor are saved.

The present invention provides a vehicle radar adjustment control method, belonging to the technical field of automobiles. The problems of complex structure and small blind area detection range in the prior art are solved. The method comprises the steps of (1) judging whether a current radar array needs to be adjusted or not, if so, completing the correction of a radar array initial angle through a swing mechanism, and if not, entering into a normal working state, (2) after entering into the normal working state, judging the driving state of a vehicle at a next time, selecting a corresponding working mode in a working mode selector according to a judgment result, adjusting the radar array to a needed angle through the swing mechanism, and entering into a radar array swing angle adjustment period, and (3) in the radar array swing angle adjustment period, through an adaptive algorithm, maintaining the angle of the radar array at a needed adjustment angle. According to the method, while the cost of a whole automobile is reduced, the range of the blind area detection is increased.

The invention discloses an active security check instrument based on a terahertz and millimeter wave arc-shaped antenna array and belongs to the technical field of security check instruments. The active security check instrument comprises a structural assembly, an imaging processing assembly, a servo driving assembly and a connecting assembly; the structural assembly comprises a top frame, a bottom frame and at least four support columns; every two support columns are symmetrically arranged. When the active security check instrument based on the terahertz and millimeter wave arc-shaped antennaarray is compared with the terahertz and millimeter wave human body security inspection equipment adopting a plane scanning mode, a horizontal direction angle covered by the arc-shaped antenna arrayis large enough, so that detection blind areas on the two sides of a human body during human body security inspection are avoided; when the active security check instrument based on a terahertz and millimeter wave arc-shaped antenna array is compared with terahertz and millimeter wave human body security inspection equipment adopting a cylindrical scanning mode, the number of transceiving antennaunits is reduced, the cost and weight of the instrument are reduced, and the instrument better conforms to the ellipsoidal appearance of the human body; and meanwhile, a first terahertz/millimeter wave band transceiver and a second terahertz/millimeter wave band transceiver do linear motion, and while, such transceivers do circular motion in cylindrical scanning equipment, and therefore, the mechanical design of the instrument is simpler, and the stability of the system is higher.

The invention relates to the technical field of optical-fiber sensing, and provides a distributed optical-fiber monitoring method and device of structure cracks. The device includes a distributed sensing optical cable, a distributed optical-fiber demodulator, a monitoring host and a data center. The distributed sensing optical cable is installed at a surface or an inside of a structure body. The distributed optical-fiber demodulator is installed near the structure body, is connected with the distributed sensing optical cable, collects feature data of the surface or the inside of the structurebody, and transmits the same to the monitoring host. The monitoring host processes the feature data, and then carries out assigned distribution. The data center manages the entire device, and controlsa customer terminal according to data after reprocessing. The problem that when crack detection is carried out by the prior art, intelligent seam finding and seam control cannot be carried out, and blind areas of detection exist are solved, then the structure cracks can be effectively identified, and the problem of the blind areas of detection is overcome.

Disclosed is a respiratory monitoring device used cooperatively with a paper diaper (10). The device comprises a first part (21) and a second part (22), wherein the first part (21) comprises a first sensor and the second part (21) comprises a second sensor, with the first and second parts being respectively arranged at different positions on the anterior belly paste (15) region of the paper diaper (10) with different orientations or inclination angles, and the first and second sensors being used for monitoring the respiratory tension change of a user and outputting corresponding signals; a microprocessor (30) electrically connected to the first sensor and the second sensor respectively and judging the respiratory status of the user according to the signals output by the first sensor and/or the second sensor; and a respiratory status indicator for indicating the respiratory status of the user according to the judgement result of the microprocessor and sounding an alarm when the microprocessor judges that the user is in an abnormal respiratory state. The respiratory monitoring device can not only remove thoracic-abdominal belt restraint of traditional respiratory monitoring, but can also steadily and reliably monitor the respiratory status of a user, thus significantly reducing the mortality rate of sleep choking syndrome.

The embodiment of the invention discloses a number display anomaly detecting method and a server. The number display anomaly detecting method comprises the following steps: obtaining first communication data and second communication data corresponding to two preset detecting time periods; confirming a first monitoring value and a second monitoring value according to the first communication data, the second communication data and a preset communication model, wherein the first monitoring value corresponds to the first communication data, and the second monitoring value corresponds to the secondcommunication data; comparing the first difference between the first monitoring value and the second monitoring value with a preset monitoring threshold, and it is represented that the number displayanomaly is detected when the first difference is greater than the preset monitoring threshold.

A combined high anti-collision sweeping robot is provided, comprising a main body of the sweeping robot, an exterior module and an anti-collision system, the top of the main body of the sweeping robot is provided with an exterior module, the anti-collision system is arranged inside the main body of the sweeping robot, and the anti-collision system includes Several anti-collision sensors installed on the inner wall of the outer ring of the main body of the sweeping robot; several anti-collision sensors are divided into two groups, one group is arranged on the upper part of the main body of the sweeping robot, and the other group is arranged on the lower part of the main body of the sweeping robot; the exterior module There is a purification and humidification system inside; the invention designs two sets of anti-collision sensors distributed up and down, which can avoid detection blind spots and improve the anti-collision ability; the invention designs an external module, which can be quickly installed on the main body of the sweeping robot and is easy to disassemble and assemble. It will not cause loss all the time; the external module is equipped with a purification and humidification system. When the humidity sensor detects that the air humidity is low, it can humidify and filter the indoor air.

The invention discloses a detection device for detecting the chamfers and the end faces of rollers simultaneously. The detection device comprises a high-speed camera and an annular light source, the annular light source is located under the high-speed camera, a ball integral light source is arranged under the annular light source, the ball integral light source is composted of a hemispheroid and a large annular light source, the hemispheroid is provided with notches allowing the rollers to be inserted, and the rollers, the hemispheroid, the large annular light source, the annular light source and the high-speed camera which are sequentially arranged from bottom to top are coaxial. The detection device for detecting the chamfers and the end faces of the rollers simultaneously has the following advantages of solving the problem that non-detection zones exist when the upper end face, the lower end face and the chamfer of an original detection bearing roller, achieving all-dimensional and all-angle nondestructive detection of the upper end faces, the lower end faces and the chamfers of the bearing rollers, detecting the bearing rollers with defects rapidly through photos shot by the high-speed camera, and being high in detection efficiency and free of detection error.

A double-sensor detection based automobile auxiliary early warning method includes: optimally setting first and second detection sensors and height detection sensors to calibrate in advance, scanning a step in a detection direction, calculating to obtain the height of the step and the distance between an automobile and the step, compensating a gap value between the automobile and the ground, judging scratch conditions of the automobile according to different detection periods, alarming in real time and adjusting a driving way. The double-sensor detection based automobile auxiliary early warning method has advantages that a driver can be reminded quantitatively, a detection range is expanded, detection blind areas are avoided, and scratching is prevented effectively.

The invention discloses a novel cutter frame. The novel cutter frame comprises a cutter frame body, and a cavity for containing cutters is formed in the cutter frame body; multiple cutter grooves forcontaining the cutters are formed in the cutter frame body; multiple infrared sensors, multiple sterilizing lamps, a control circuit board and a power source are arranged in the cutter frame body, andthe infrared sensors, the sterilizing lamps and the power source are electrically connected with the control circuit board; the infrared sensors and the sterilizing lamps are arranged corresponding to cutter bodies of the cutters, and the two infrared sensors are correspondingly arranged at the two sides of the cutter body of each cutter. According to the novel cutter frame, by arranging the infrared sensors, whether or not the cutters are placed on the portions corresponding to the infrared sensors can be sensed, and if it is detected that the cutters are placed, the sterilizing lamps are turned on to sterilize and disinfect the cutters; the working time of the sterilizing lamps can be controlled through the control circuit board, and after the sterilizing lamps work for a certain time period, under the function of the control circuit board, the sterilizing lamps are turned off.

The invention relates to a rehabilitation device capable of comprehensively quantifying a pelvic floor muscle. The rehabilitation device comprises a rehabilitation sphere, pressure sensors, a data processor and a mobile terminal. One end of the rehabilitation sphere is integrally formed and connected with a transmission line; the other end of the transmission line is connected with the data processor; the pressure sensors are disposed on the rehabilitation sphere, the number of the pressure sensors is four, and the pressure sensors are distributed on four sides of the rehabilitation sphere; the pressure sensors are connected with the data processor through the transmission line, the data processor is connected with the mobile terminal in a wireless mode; and the mobile terminal also includes a balancing weight. The rehabilitation device has the advantages that the rehabilitation device capable of comprehensively quantifying the pelvic floor muscle can rehabilitate the four sides of thepelvic floor muscle, and the rehabilitation dynamics can be quantified; visual display can be performed by combination with the mobile terminal; patients' training with different intensities is monitored, and efficient physiotherapy is performed on the pelvic floor muscles of the patients.