39results about How to "Avoid missing alarms" patented technology

The invention relates to a human body temperature measuring method based on an infrared human face detection technology. The method comprises following steps: when over-temperature points appear on aninfrared image obtained by an infrared temperature measurer, judging whether the over-temperature points stay in a human face area of a moving infrared image in the infrared image; if the over-temperature points stay in the human face area of the moving infrared image, utilizing a matching algorithm to find an area, which is corresponding to the human face area in the infrared image, in a visiblelight image; using a visible light human face detection technology to judge whether a human face area exists in the area, which is corresponding to the human face area in the infrared image, in the visible light image; if the result is positive, taking the over-temperature points as alarming temperature points, and giving off an alarm. The false alarm caused by image matching and synchronizationbetween infrared light and visible light is avoided, and missed alarm caused by light and skin sensitivity of a visible light human face detection technology is prevented.

The invention relates to a laser detection and control system for barriers between a shield door of a metro platform and a train door, comprising a monitoring unit, a control unit and an alarm unit, wherein, the controller comprises a CPU module, a liquid crystal terminal, a signal isolator, buttons and a safety relay; generating lasers are respectively installed on a front bracket, and a laser receiver or a laser reflection plate is installed on a rear bracket corresponding to the front bracket; the control ends of the generating lasers are connected with the output end of the controller, and the output end of the laser receiver is connected with the input end of the controller; the corresponding output end of the controller is correspondingly connected with the control input end of the shield door; and the corresponding output end of the controller is connected with a buzzer and a caution light of the platform. The laser detection and control system realizes the intelligent operation of judging the existence of barriers between the shield door of the metro platform and the train door, has the advantages of compact integral structure, reasonable cost, easy and convenient installation, simple and intelligent operation, stable and reliable performance, higher practicability and favorable development prospect, and is applicable to metro platform.

The invention provides a method and a device for monitoring and alarming residual current, and a detection controller. The method comprises the following steps of: acquiring a three-phase load current value and a residual current value of a monitored loop; generating and storing the residual current relative value of each acquisition time point according to the acquired load current value and residual current value; performing statistical analysis on a plurality of residual current relative values in a preset time interval, and generating and storing the statistical parameters of the plurality of residual current relative values; generating an alarm threshold value of a monitoring time point according to the residual current relative values and the statistical parameters which are stored before the monitoring time point; and monitoring and alarming the residual current of the monitored loop according to the generated alarm threshold value. By the method and the device for monitoring and alarming the residual current, and the detection controller, a leakage alarm and a false alarm caused by the conventional fixed alarm threshold value can be avoided.

The invention belongs to the technical field of safety warning and particularly relates to a child fall-off-bed warning system and method. The system comprises a covering layer and a human body communication transceiving device. A warning area forms around the covering layer. The human body communication transceiving device is disposed in the warning area of the covering layer. When a child arrives the warning area and touches the human body communication transceiving device in the warning area, a signal transceiving link of the human body communication transceiving device is closed through the human body to trigger warning; the covering layer is a mattress or other bedding articles. The child fall-off-bed warning system and method has the advantages that warning accuracy can be maximally improved and warning missing is avoided; the warning area is a certain distance away from the bedside, and full time is gained for guardians to take safeguard procedures; the human body communication transceiving device is integrated on the bedding and needs no extra space; signal transmission is performed based on human body communication, and system power consumption is low.

The invention provides a well cover with an anti-theft function. The well cover comprises a well cover body and a monitoring module, wherein the well cover body comprises a well cover shell as well as a sensing unit, a signal generating unit and a processing unit which are packaged in the well cover shell; the sensing unit and the signal generating unit are respectively connected with the processing unit; the monitoring module comprises a seal shell as well as a well cover detecting unit, a control unit, a signal transceiving unit and an alarm unit which are packaged in the seal shell; the well cover detecting unit, the signal transceiving unit and the alarm unit are respectively connected with the control unit; the signal generating unit is coupled with the signal transceiving unit; and the signal generating unit adopts a preset identification code for identification. The well cover has the following advantage: when the well cover body is stolen or is subjected to displacement change, and the alarm unit is started for alarming, thus on the basis, the well cover body is quickly and accurately found out via the identification code.

The invention discloses a bi-directional wireless intelligent door magnetic detector. The bi-directional wireless intelligent door magnetic detector comprises a cylinder and door magnetic switch combination body, a wireless door magnetic sensor and a door magnetic alarm, wherein the wireless door magnetic sensor comprises a door magnetic sensor, door closing and opening circuits, a power module, an MCU (microprogrammed control unit), a voltage-stabilizing and filtering circuit, a Wi-Fi (wireless fidelity) module power supply control circuit, a clock circuit and a low-voltage detection circuit; an input end of the door magnetic sensor is divided into two paths, one path is electrically connected with the door closing circuit and the clock circuit, and the other path is electrically connected with the door opening circuit and the MCU through the voltage-stabilizing and filtering circuit; the voltage-stabilizing and filtering circuit and the MCU form a closed loop through the Wi-Fi module power supply control circuit and a Wi-Fi module; an output end of the door magnetic sensor is electrically connected with the MCU through the door closing circuit and the door opening circuit. The bi-directional wireless intelligent door magnetic detector solves the problems that a detector in the prior art is high in cost, large in size, complicated in circuit and high in power consumption and a battery can only support the detector for a few days, can detect the opening and closing states of doors, windows and drawers, and has the advantages of low power consumption, low cost and small size.

The invention discloses a warning method and device for a minimum safe altitude of an aerial target. The warning method comprises the following steps of: judging whether a first altitude difference is larger than a set warning interval height, wherein the first altitude difference is the altitude difference between the height of the current position of the aerial target and the height of a surficial grid where horizontal coordinates of the current position of the aerial target are located; judging wherein a connection line between the current position and an extrapolated warning track point is intersected with a grid cube if the first altitude difference is larger than the warning interval height; and determining whether to give an alarm according to the distance between the current position and an intersection if the intersection exists. As the step of judging whether the aerial target can penetrate through the surficial grid and is intersected with the grid cube within a set time slot is also added in the invention, the phenomenon of incapability of giving the alarm when the aerial target violates the safe altitude during the flight, so that missed alarms can be avoided.

The invention provides a detection method of synthetic drug components in food. The method comprises the following steps: (1) classifying and detecting standard samples of synthetic drug components to be detected and establishing a standard database; (2) detecting a food sample; and (3) automatically comparing a detection result and the standard database by an instrument and drawing a conclusion. Analysis is finished within 1 min. The method provided by the invention requires no professional training, has advantages of portable instrument, simple operational program, low cost of consumables and fast detection speed, and can be used as a method for rapid batch coarse-screening of synthetic drug components in a health product for base-level health products supervisory authorities at a law enforcement scene or for special testing agencies at a lab.

The invention provides a user-defined event alarm method and system based on a time sliding window, and relates to the technical field of alarm systems, the method comprises the following steps of: obtaining a user-defined event list, wherein, the list includes the time point of each user-defined event; starting from the earliest time point in all time points, calculating the number of events occurred in a preset time period, circulating the following steps: if the number of times is greater than or equal to a preset value, then alarming, and marking all events within the preset time period with the first value, wherein, the first value indicates that this event is alarmed; if the number of times is less than the preset value, marking a second value for the first event in the preset time period, wherein, the second value indicates that the event is abandoned; starting from the earliest time point in all time points, based on the events without the first value mark or the second value mark, calculating the frequency of events in the preset time period, the method solves the technical problem that a prior event alarm method is easy in missing reporting.

The invention provides a hydrological model subsection screening method suitable for forecasting and early warning of rainstorm mountain torrent flood in a small watershed in a mountainous area, whichdivides actually measured flood and flood simulated by a hydrological model into an expansion starting section, an abrupt expansion section, a disaster forming section and a water recession section.The hydrological model is screened by comparing the calculation results of the hydrological model for the abrupt expansion section and the disaster section with the actually measured flood, the earlycapturing capability of the hydrological model for some key disaster early warning moments of the abrupt expansion section is fully considered, the screened hydrological model can capture the disastermoment caused by the abrupt expansion of the rainstorm flood in advance, and missed alarm can be avoided. The accuracy and reliability of early warning of the rainstorm and mountain torrent disastersin the small watershed of the mountainous area are improved, and more scientific guidance and technical support can be provided for forecasting and early warning of the rainstorm and mountain torrentdisasters in the small watershed of the mountainous area.

The invention provides an energy-saving alarm method and alarm system based on a Bluetooth beacon. The method comprises the steps that whether a sampling result exceeds at least one preset early warning threshold value and at least one preset alarm threshold value or not is judged, and if yes, a Bluetooth sensor adjusts the sampling period and the broadcasting period of the Bluetooth sensor according to the preset early warning threshold value or the alarm threshold value; whether the average receiving period of the Bluetooth broadcast signals received by the Bluetooth beacon and adjusted by the Bluetooth sensor is not higher than or lower than at least two average receiving periods of the Bluetooth beacon is judged; and if the Bluetooth sensor still cannot ensure that the average receiving period of the Bluetooth broadcast signal of the Bluetooth sensor received by the Bluetooth beacon is not higher than or lower than at least two average receiving periods of the Bluetooth beacon through adaptive adjustment, the Bluetooth sensor initiates connection with the Bluetooth beacon to give an abnormal alarm. According to the technical scheme, the Bluetooth sensor and the Bluetooth beaconrealize broadcast in two directions, electric energy is saved, it is ensured that alarms can be sent out in time, and missed alarms are avoided.

The invention relates to an optical path fault detection device and detection method of a fiber laser. The detection device is mainly composed of an optical sensing module, a power supply module and amain control chip. The main control chip is internally provided with an optical detection judgment program, the main body of the optical sensing module is an insulating sealed box, the box contains aphotosensitive material, and the photosensitive material has the characteristics of extremely low conductivity before exposure and instantaneous increase of conductivity after exposure. The power supply module applies an electric signal to the optical sensing module and transmits a level signal between two electrodes of the optical sensing module to the main control chip at the same time, and themain control chip judges the state of the optical sensing module according to the read level so as to judge whether an optical path is abnormal or not. The device is helpful for quickly judging the fault position of the optical path under the condition of not damaging the whole structure of the fiber laser, so that the reason of the optical path fault can be accurately positioned.

The invention provides a method for automatically updating a clutter map of a pavement micro target detection radar, which can update the clutter map in real time, improve the detection probability ofa micro target of which the echo power is at the edge of a detection threshold, and avoid missing alarm and false alarm. After the pavement micro target detection radar is started, the pre-scanning is carried out to generate two clutter maps, the clutter maps are stored, one clutter map is subjected to smoothing processing and used for clutter map CFAR detection during detection scanning, and theother clutter map is directly stored without any processing. And during each time of detection scanning, a smoothed clutter map is called, an unsmoothed clutter map is updated according to a cluttermap automatic updating judgment condition after the scanning is completed, the updated clutter map is smoothed and a previous smoothed clutter map is replaced for the next detection scanning, and thesteps are repeated. Due to the existence of an automatic updating judgment condition, missing alarm caused by updating the target into the clutter map is avoided; the clutter map can be updated in real time in rainy and snowy days, and false alarm caused by accumulated water or accumulated snow is avoided.

The invention discloses a spark detection device with a self-cleaning function. The spark detection device comprises an air path base, a sensor mounting base, a probe lens and a sensor. The air path base and the sensor mounting base are each of a step shaft sleeve structure. The air path base comprises an air path connecting flange, a mounting shaft shoulder, a locating center hole, an annular air path, a connecting thread hole, a connecting through hole and a self-cleaning air hole. The sensor mounting base comprises a counter flange, a matching shaft shoulder, a probe hole, a lens limiting ring, a butt joint through hole, a mounting through hole, a light hole and an air inlet hole. The matching shaft shoulder is arranged in the locating center hole in a sleeved mode. The contact surface between the air path base and the sensor mounting base forms a sealing structure. The air inlet hole is communicated and connected with the annular air path. The probe lens and the sensor are both clamped in the probe hole of the sensor mounting base. The air path base and the sensor mounting base are fixedly mounted on a cotton passing cylinder of the spark detection device through fixing screws. The spark detection device is simple in structure, convenient to use, high in practicability and security coefficient and capable of providing a reliable fire alarm for cotton spinning production.

The invention discloses a monitoring and alarming device for the bare wire of an enameled wire. The device comprises an alarm, a relay, a controller for controlling the starting and stopping of the take-up process of an enameled wire, two guide wheels for guiding the take-up process of the enameled wire, and a detection power supply. The two guide wheels are respectively and correspondingly connected to the two output electrodes of the detection power supply. The relay is connected in series with anyone of the two guide wheels. The two guide wheels are connected with the detection power supply through eliminating the grounded state of the guide wheels. The above relay is adopted instead of a time relay, so that the influence of the power grid, a ground wire and a plurality of paintings on the enameled wire on electromagnetic induction signals can be avoided. When the surface of the enameled wire is bare, a detection electrode between the two guide wheels is switched on. The relay is energized. At this time, a normally closed contact is powered off, so that the controller is powered off. The take-up process of the enameled wire is stopped. At the same time, a normally open contact is switched on, and the alarm is energized to send out an alarm. The advantages of fast response speed, false alarm prevention, leaked alarm prevention, stable and reliable structure and the like are realized.

The invention discloses an adjustment method used for lane width threshold of blind spot monitoring system. The adjustment method comprises the following steps that (a) the front view multi-functionalcamera which is assembled in the front middle of the vehicle recognizes the current lane information, if the front view multi-functional camera can recognize the lane line of the current lane, step (b) is entered, otherwise step (d) is entered; the front multi-function camera outputs lane width L1, the distance L2 from the left side of a vehicle to the left lane line and the distance L3 from theright side of the vehicle to the right lane line; (c) the blind spot monitoring system sets the lane width threshold value and set the left lane width threshold value as L1 + L2 and the right lane width threshold value as L1 + L3; and (d) the blind spot monitoring system sets the lane width threshold value according to the current vehicle speed value. The adjustment method used for lane width threshold of blind spot monitoring system can automatically adjust the threshold value of lane width to prevent the situation of missing alarm or false alarm of blind spot monitoring system.

The invention discloses an early warning method for judging a defect of a kinematic pair of mechanical equipment through a variable value. Through establishment of a relation between an early warningvalue of the defect of the kinematic pair of the mechanical equipment and the environment temperature, the early warning value of the defect of the kinematic pair of the mechanical equipment is converted into a temperature variable value from a temperature constant value, a problem of early warning or probability of the defect of the kinematic pair of the mechanical equipment under the unstable environment temperature condition is solved, and the occurrence of a leakage alarm phenomenon is avoided.

The invention discloses an anti-satellite reconnaissance safe action method for the earliest arrival in a road action, which realizes the avoidance of multi-satellite reconnaissance by a moving vehicle under a fixed action route. When a strategy of anti-satellite reconnaissance avoidance safety action is formulated, two elements needing to be focused are arrival time and avoidance duration respectively. An earliest arrival strategy generally needs to be selected under the condition of task emergency, and when enough redundant time exists and the requirement for safety is high, a task party can select a strategy with the shortest avoidance duration on a road. Missed alarms possibly caused by spaceflight reconnaissance avoidance calculation only carried out on important point locations are avoided, and low efficiency caused by the calculation of the whole area through which the route passes is also avoided. Compared with the prior art that only the starting and ending time of the safety window is output, the method is more visual. Effective reference and support can be provided for spaceflight reconnaissance avoidance and action strategy planning of vehicle actions, and the method has high practical value.