327results about How to "Protect life and property safety" patented technology

The invention discloses a composite monitoring system. The system comprises a central processing unit, at least one linear monitoring and processing system, at least one point mode monitoring and processing system, a plurality of field acquisition modules and an output control processing system, wherein the point mode monitoring and processing system is in charge of thoroughly monitoring the temperature, stress, vibration, pressure, gas and smoke of a monitored place and the voltage, power, frequency, overload, under-voltage and power leakage and other information needed for power monitoring through a plurality of field acquisition modules in fit with the linear monitoring and processing system and a linear detecting line thereof, the central processing unit judges if any abnormality occurs by comprehensively analyzing the field information received; If so, the central processing unit controls the equipment arranged on site to respond accordingly through the output control processing system. The system has the characteristics of high detecting accuracy, complete functions and rapid response, and can monitor the abnormal changes of the monitored area to a greater extent so as to protect the safety of human lives and properties.

The invention discloses a method for reclaiming house type remaining coal pillars based on filling and rebuilding of entry protection coal-pillar band, and belongs to reclaiming methods of house type remaining coal pillars in coal goafs. The reclaiming method of remaining coal pillars comprises the following steps: estimating and grading the stability of house type remaining coal pillars in a coal goaf; determining the width of entry protection coal pillars to be filled and rebuilt and the length of a band working face; performing an entry protection coal pillar filling and rebuilding technology; and performing a coal pillar reclaiming method and technology. According to the method, the minimum width of the entry protection coal pillars to be rebuilt, and the largest length of the band working face are determined according to the grades of the stability of the remaining coal pillars in the coal goaf; through the adoption of method for filling and rebuilding entry protection coal pillars, the stability of original coal pillars is greatly improved, so that the surface subsidence is controlled, and remaining coal pillar resources are reclaimed to the greatest extent; the purposes that the surface subsidence is reduced, the life and property safety of people in mining districts are protected, and the utilization ratio of resources is increased are realized. The method disclosed by the invention has the advantages of being simple, easy to operate, high in efficiency for filling and rebuilding entry protection coal pillars, and low in cost; the targets that the waste of resources is reduced, and the surface subsidence is controlled are realized, and the method can be widely applied.

The invention discloses a cement-based composite material with high-temperature resistance and superhigh performance and a preparation method thereof. The cement-based composite material comprises the raw materials of a gelled material, an aggregate, fibers, a water reducing agent and water, wherein the gelled material is a mixture of cement and active mineral admixture, the aggregate is yellow sand or a mixture of yellow sand and pebbles, and the fibers are organic fibers or mixtures of organic fibers and metal fibers. The cement-based composite material is produced through improvement on the basis of common concrete manufacturing, has the properties of superhigh mechanical property and high-temperature resistance, is applicable to high-temperature resistant engineering structures, and is favorable for preventing the collapse and the destruction of the construction structures in a fire disaster.

The invention relates to a halogen-free Grade B1 high flame retardant spray-applied polyurethane foam plastic which is characterized by being prepared by mixing and foaming of halogen-free Grade B1 high flame retardant spraying polyurethane foam plastic combined polyether and isocyanate. By using the halogen-free polyether glycol and adding a halogen-free flame retardant, the flame retardant property of the prepared polyurethane foam plastic can reach national Grade B1 standard; the gas released in the burning process of the foam is low in toxicity and concentration, thereby effectively protecting safety of life and properties of people; because of the lower grade of the used isocyanate, the cost is obviously reduced; and the foam has better heat conductivity coefficient and cohesive property.

The invention relates to a building column-truncating, replacing and seismic-isolating support construction method and a supporting device. The construction method includes 1), mounting the supporting device, namely mounting the supporting device around an original-structure reinforced concrete column where a seismic-isolating support is needed to be mounted; 2), after the supporting device is mounted, truncating the column at a position where the seismic-isolating support is mounted; 3), disposing the seismic-isolating support in the position to complete mounting of the rubber seismic-isolating support. Seismic isolating technology is applied onto an existing building by utilizing a supporting system, so that cost for reinforcement and reconstruction is greatly lowered, earthquake resistance of the building is effectively improved and enhanced, a mode which is safer, more economical and more environment friendly is brought to proprietors, and a novel reinforcement method solution and a more scientific anti-seismic mode are provided for old buildings positioned in seismic areas.

The invention relates to a method for applying a RFID technology and a sensor technology to the supervision and the control of safety equipment, which comprises the following concrete steps of: (a) reading safety equipment adhered with specific electronic tags at real time by utilizing a radio-frequency identification (RFID) monitoring and managing system installed in public places and finishing the real-time monitoring of the working state of the safety equipment; (b) if the monitoring and managing system can not effectively identify the due tag number in a RFID read-write area of the monitoring and managing system, informing an alarm emergency treatment platform of starting working by a background service system; (c) if tag information does not conform to the current state information of the safety equipment in the processes of maintenance, overhaul and check, triggering a corresponding alarm by a RFID read-write unit and informing a manager of carrying out treatment; and (d) if the detection value of a sensor in the public places is abnormal, showing the existence of safety accidents or hidden danger; and when conforming to an alarm condition, issuing an alarm by the background service system and starting an alarm emergency treatment plan. The invention has the advantage of simple and convenient installation, debugging and maintenance.

The invention discloses an invisible air sac multi-body overturn-preventing mono-hull ship. The mono-hull ship comprises a ship body, wherein air bags are arranged on the left side and right side or one of the left side and right side of the ship body, gas generation devices are connected to the air bags, and the air bags are connected to the side edge of the ship body through expansion devices; during normal sailing or berthing, the expansion devices are normally closed, and the air bags are in a gas-free state and put away on the side edge of the ship body; when a capsizing risk exists, the expansion devices expand towards the left side and right side of the ship body manually or automatically so that the air bags can stretch out and be filled with gas through the gas generation devices, and a multi-hull ship structure is formed by the air bags and the ship body through a support formed by the expansion devices. Conversion between a mono-hull ship structure and a multi-hull ship structure can be achieved conveniently, the mono-hull ship structure is obtained during normal sailing or berthing, occupied space is small, and sailing flexibility is high; when a capsizing risk exists, the air bags expand to form a multi-hull ship structure, the stability of the ship body is improved, an inclined ship body can restore quickly, anti-capsizing performance is improved, and life and property safety of people on the ship is effectively guaranteed.

The invention discloses a monitoring alarm system for city well covers and rails and a monitoring method thereof. The system includes an inclination-angle measurement module, a control module, a wireless transmission system and a monitoring center. The control module is connected with the inclination-angle measurement module and judges a well cover inclination-angle condition according to information acquired by the inclination-angle measurement module. The wireless transmission system is connected with the control module and the monitoring center and analyzes and processes well cover information of the control center and sends the well cover information to the monitoring center. The inclination-angle measurement module measures inclination-angle information of well covers through measurement of the gravity accelerations of the well covers. The control module is used for judging whether inclination angles measured by the measurement module exceed an alarm threshold so as to decide whether to alarm. The system is capable of reducing a well cover vacancy time to the largest degree so that life and property security is protected; and the system is not limited to city well covers or rails, e.g., inclination and collapse of road rails and advertising boards can also be monitored.

The present invention relates to a double-waveband infrared flame detector and its detection method. Said detector includes supporting frame, external shell, protective lens, filter, infrared sensor, amplification circuit, signal processing circuit, power supply conversion circuit, signal output circuit, internal and external shielding covers,detector interface plate and setting circuit. Said invention also provides its working principle and concrete steps of its detection method.

The police strength dispatching and controlling system includes command center system, mobile police service system and supervision system. The mobile police service system completes the GPS signal receiving and analysis via GPS and universal grouped radio service network, GPRS network signal connection and police service treatment, and returning the GPS information to the command center system. The supervision system is used in supervising the information exchange between the mobile police service system and the command center system and the information exchange inside the command center system. The present invention may be used widely for various classifications of police, and has the advantages of low cost, high practicability, high performance / cost ratio, etc.

The invention relates to a function-restorable assembly type beam column-column flange connection joint device and belongs to the field of structural engineering. A function-restorable assembly type beam column-column flange connection joint is composed of a round steel pipe column with a cantilever beam section, a lower round steel pipe column section, a common beam section and a connecting device. Welded parts in the joint device are finished in a factory, and weld seam accuracy and quality are easier to control; the round steel pipe column with the cantilever beam section, the lower round steel pipe column section and the common beam section are assembled only through high-strength bolts and connecting plates on site; fastening work of the bolts is convenient and fast; and construction speed is greatly improved. Meanwhile, the common beam section can be built on the lower connecting plate of the cantilever beam section, so that the construction difficulty is lowered, and on-site assembly and positioning are easy. The joint of the joint device is a beam-end reinforcement and cover plate connecting weakening combined joint; through reasonable design, double energy dissipation of bolt friction slippage and plate plastic deformation can be achieved; fast restoring after an earthquake is easy; and the joint ductility is good, and the energy-dissipating capacity and bearing capacity are high.

The invention relates to a fire-fighting early-warning monitoring and intelligent management system based on an internet. The system integrates functions of eight kinds of software, comprising telephone networking early-warning software, wire video monitoring early-warning software, wireless video monitoring early-warning software, mobile video monitoring early-warning software, satellite video monitoring early-warning software, video on demand software, video session software, live video software, and the like, and the functions can be used independently or integratedly by users. The system can perform large-area networking management on fire alarm systems in buildings, and can realize effective monitoring and quick alarm. The system guarantees the normal operation of the fire alarm systems and fire safety facilities, improves the reliability of the fire alarm systems, and reduces the rate of false alarm. Moreover, through the equipment operating data and alarm information of the fire early-warning monitoring intelligent alarm system based on the internet, the developing process of intelligence and networking of city fire management is accelerated, and thus, the integral technology level and the comprehensive capability of fire prevention and reduction are enhanced.

The invention discloses an explosion-proof sentry box, which is composed of a framework, a top board, an explosion-proof composite glass wallboard, an explosion-proof composite glass door and a floor; the explosion-proof composite glass wallboard consists of a bulletproof composite transparent glass, a polycarbonate transparent board, interlayer transparent glass, a molecular sieve rack, a molecular sieve, double-sided sponge adhesive tapes, sealing agent and a U-shaped clamping groove, wherein the framework is formed by welding section steels and is provided with a plurality of screw holes, a hinge base connected with the explosion-proof composite glass door, a steel.-made plane bonded with the periphery of the explosion-proof composite glass wallboard and screw holes connected with the floor, the top board is composed of three layers of galvanized iron boards arranged in a parallel, superposed and combined manner, the peripheries of hollow cavities between corresponding planes in the top board are provided with steel square tubes, and a steel board of each plane is fastened with the steel square tube via a sunk head rivet. The explosion-proof sentry box can be extensively applied to important places, such as military base, scientific research site, prison, customs, frontier, etc., and public security places, and lives and properties of staff on duty can be effectively protected by using multi-layer composite glass.

The invention provides a vehicle rear-end collision emergency avoidance method, system and equipment and a storage medium. The method comprises steps as follows: the relative distance and the relativespeed between a vehicle and a rear vehicle are acquired, and a lateral driving speed of the rear vehicle is acquired; when the lateral driving speed of the rear vehicle is smaller than a preset speedthreshold value, predicated collision time of the vehicle with the rear vehicle is smaller than a preset time threshold value and adjacent vehicles exist on two adjacent side lanes in the first preset distance of a front lane of the vehicle, the vehicle performs information interaction with the adjacent vehicle with the maximum distance to the front vehicle in the front two adjacent side lanes, aselected adjacent vehicle is accelerated to vacate an avoidance area to allow the vehicle to drive by changing the lane, or the vehicle changes the lane to the vacant adjacent lane on one side with low contact ratio with the rear vehicle, or the vehicle changes the lane to the adjacent lane on one side where no adjacent vehicle exists in the front two adjacent side lanes. Safe active lane changeoperation can be performed timely, and life and property safety of passengers in a vehicle is protected.

The invention relates to a combined giant column composed of an irregular-section multi-cavity steel tube with a built-in concrete-filled circular steel tube, and a construction method thereof, and belongs to the field of building. The section form of the steel tube can be triangular, quadrilateral, pentagonal, hexagonal and the like, the composite giant column composed of the irregular-section multi-cavity steel tube with the built-in concrete-filled circular steel tube is formed under the combination or single use of different section forms. A diaphragm plate is welded with a square steel tube, a longitudinal stiffened rib is welded with the square steel tube and the diaphragm plate, and the circular steel tube is welded with the longitudinal stiffened rib and the diaphragm plate. High-strength concrete is poured in the steel tubes, the strength of concrete in the circular steel tube is higher than that of concrete in the square steel tubes, and recycled concrete can be poured in the circular steel tube. The bearing capacity of axial compression and partial compression of the irregular-section multi-cavity steel tube concrete giant column is improved; the combined giant column has an important significance on the improvement of stress concentration and hydration heat of concrete of the irregular-section multi-cavity steel tube concrete giant column; the method is simple, convenient, economical and effective and is beneficial to popularization and application in the design of building structures.

The invention provides an intelligent sensing analyzer which comprises an information acquiring unit, an information processing unit and a central processing unit. The information acquiring unit receives sensing information via an interface unit and outputs the sensing information, and the sensing information is transmitted by a sensing layer; the sensing information outputted by the information acquiring unit is coded and compressed by the information processing unit, and the information processing unit judges whether the coded and compressed sensing information is matched with at least one event rule among a plurality of preset event rules or not and outputs corresponding event alarm notification when the coded and compressed sensing information is matched with the event rules; the central processing unit transmits the event alarm notification to an application layer when receiving the event alarm notification outputted by the information processing unit, and outputs corresponding alarm control instructions. The intelligent sensing analyzer has the advantages that thousands of target objects can be simultaneously monitored by the intelligent sensing analyzer, alarm effects can be realized for suspicious events, accordingly, individuals can be liberated and only handle suspicious monitored points, and the event detection timeliness and the event handling efficiency can be improved.

The invention discloses a remote authorization method for combination locks. The method includes that users preliminarily set secure secret keys via control centers; visitors input authorization requests via touch pads; dynamic cipher texts are generated by the control centers according to the authorization requests; the dynamic cipher texts are transmitted to intelligent terminals of the users by the control centers via communication modules; unlocking passwords are computed by the users according to the received dynamic cipher texts, the preliminarily set secure secret keys and encryption algorithms; the visitors are further authorized; the unlocking passwords are inputted by the visitors via the touch pads; information is verified by the control centers; the electric control locks are unlocked if the information is successfully verified; the electric control locks keep locked if the information fails to be verified. The remote authorization method for the combination locks has the advantages that remote authorization unlocking functions can be implemented according to the dynamic cipher texts, the preliminarily set secure secret keys and the special encryption algorithms, accordingly, the life and property safety of people can be protected to the greatest extent, and the remote authorization method is low in cost and high in reliability.

Embodiments of the application provide a vehicle driving system, method and device, and the system comprises a mobile terminal and a target vehicle, and further comprises at least one Bluetooth receiver, and a Bluetooth positioning server respectively connected to the Bluetooth receiver, the mobile terminal and the target vehicle through Bluetooth, wherein the Bluetooth receivers are set at predetermined positions in a parking lot where the target vehicle is located. In the embodiment of the application, when receiving a vehicle calling instruction sent by the mobile terminal, the target vehicle determines a driving route to the mobile terminal according to the positioning information of the target vehicle and the positioning information of the mobile terminal obtained from the Bluetooth positioning server based on the layout of the parking lot, and arrives at the location corresponding to the positioning information of the mobile terminal based on the determined driving route, therebyeffectively avoiding the problem that the vehicle owners are prone to accidents when looking for vehicles in the parking lot due to the large number of vehicles and complicated road environment in the parking lot.

An anti-twisting novel soft steel energy dissipation device of a plane irregular structure comprises a locating connector 1, a first energy dissipation soft steel strip set 2, a second energy dissipation soft steel strip set 3, a first bolt hole set 4 and a second bolt hole set 5. Installation positions of soft steel energy dissipation strips can be accurately fixed through the arrangement of the locating connector. The soft steel energy dissipation device can not only improve rigidity of a building structure and improve structural damping, but also have effects of deformation and energy dissipation when the structure encounters an earthquake action and improve an earthquake resistant property of the structure, and meanwhile the soft steel energy dissipation device has functions of corrosion resistance and rust resistance, an installable / detachable function and other functions. The anti-twisting novel soft steel energy dissipation device of the plane irregular structure can be applied to not only a new-built structure, but also a reinforced improvement of an old building, and satisfies double needs of a newly-built building and an old building. With increasing complexity of a building structure form and increasingly improved requirements of people for building performance, the anti-twisting novel soft steel energy dissipation device of the plane irregular structure has a wide development space and wide engineering application prospect.

The invention provides a gas pipe line leakage protection method comprising steps of: acquiring flame signal of gas kitchen ranges real time; extracting flow capacity information of gas house lead in pipeline real time; shutting down the house lead in gas pipeline and alarming when flow capacity information exist on the gas meter and non flame signal of the gas kitchen ranges in 10-30s. according to invention, the device comprises a flame signal capturing module, a control circuit, a normally closed solenoid valve, a flow capacity signal capturing module and a alarm; the control circuit acquires working condition information of the gas kitchen ranges with the flame signal capturing module, flow capacity information of the house lead in pipeline is acquired by the flow capacity signal capturing module, when the flow capacity signal capturing module has flow capacity information and the flame signal capturing module has not potential signal, the control circuit separately sends signal to the normally closed solenoid valve and the alarm. The invention resolves problem that possible leakage of the indoor gas pipe system may carry potential safety hazard, which effectively protects users, and manpower is saved, also operating cost of city gas pipeline is reduced.

The invention relates to the building construction technical field, in particular to a construction method which is suitable for various industrial and civil building walling having the requirement of energy conservation in a large part of China under different climate conditions. The construction method comprises the following steps that: a bonding agent is used for bonding an insulation board on the walling; mortar is coated on the insulation board and a piece of medium-alkali mesh cloth is wrapped in the mortar; and coating is plastered on the mortar, and the insulation board is a foam glass insulation board. The construction method effectively utilizes waste resources, reduces the environmental pollution, improves the utilization rate of energy, not only solves the problems of cracking and hollowing of the building walling but also improves the heat-insulating property, guarantees the elegant appearance of a veneer of the building walling, prevents the occurrence of a fire disaster, and protects the life and property safety of people.

The invention provides a landslide and debris-flow pre-warning system based on a 4G network, and belongs to pre-warning systems. According to the technical scheme, the landslide and debris-flow pre-warning system based on the 4G network comprises an on-site collecting module, a data transmitting module, a data collecting and processing center and a pre-warning transmitting system. Energy is provided by solar energy and wind energy, so that vertical displacement and horizontal displacement information is collected by the on-site collecting module and transmitted to the data collecting and processing system through the data transmitting module, and the processed information is sent to each victim wanting to be related through the pre-warning transmitting system. The landslide and debris-flow pre-warning system based on the 4G network is good in pre-warning effect, low in cost, high in pre-warning speed, high in pre-warning precision, and environmentally friendly, saves the energy and manpower, makes up losses caused by debris flows and landslides timely, protects life and property security of the masses, and has high generalizability.

The invention discloses an unmanned aerial vehicle management platform. The unmanned aerial vehicle management platform comprises an onboard control terminal and a remote monitor and control terminal, wherein the onboard control terminal is in control connection with an unmanned aerial vehicle self-driving instrument, the control for an unmanned aerial vehicle structure platform is realized, and an energy management system is used for carrying out intelligent control on power supply of the onboard control terminal; the energy management system comprises an energy management controller, a lithium battery assembly and a solar battery assembly; the energy management controller is electrically connected with a battery state detection module, an intelligent charge and discharge module and a maximum power tracking module; the lithium battery assembly is electrically connected with a lithium battery protection circuit, and is electrically connected to the battery state detection module and the intelligent charge and discharge module through the lithium battery protection circuit; and the solar battery assembly is electrically connected with a DC-DC converter, and is electrically connected to the battery state detection module and the maximum power tracing module respectively through the DC-CD converter. The unmanned aerial vehicle management platform solves the technical problem that a management platform capable of improving the energy utilization efficiency of an unmanned aerial vehicle and also strengthening the control for the unmanned aerial vehicle is lacked at present.

The invention belongs to the technical field of natural disaster control and discloses a dry-hot valley debris flow treatment method. Blocking and bed reinforcement engineering is arranged, debris flow solid loose material sources are stabilized, blocking and bed reinforcement are used as the focus of a whole trench, in combination with proper drainage engineering and plant engineering, movement of the loose material sources of debris flow material source areas is controlled in a comprehensive treatment mode, and meanwhile, drainage troughs on the downstream part are dredged; the engineering are arranged with the focus of the safety of farmlands of downstream accumulation areas and the safety of villager accumulation areas; engineering measures mainly comprise existing engineering reinforcement, that is, the built drainage troughs are heightened, the heightening height is 1.5 m, and the total length is 4120 m; blocking is used as the focus, and two blocking dams are arranged in the range of 1390-1430 m of the downstream part of the main trench; and blocking dams are arranged on the downstream part, drainage troughs are built in combination with the built drainage troughs, and a complete drainage system is formed. Through the method, the obvious effect of whole engineering is achieved advantageously, and the engineering is combined with city planning favorably.

The invention discloses a fireproof foam board and a production method thereof. The fireproof foam board comprises a waterborne binding agent solution, polystyrene particles, magnesia, talcum powder, wood powder and a foaming agent in volume ratio of 0.3:1:0.2:0.05:0.1:0.0005, wherein the waterborne binding agent solution is prepared from water and a waterborne bonding agent according to the volume ratio of 1:450; weighing various materials according to the formula; feeding the wood powder in the waterborne binding agent solution firstly; uniformly stirring and pouring the magnesia and the talcum powder; uniformly stirring and feeding the foaming agent for foaming; after foaming, enabling the mixture and the polystyrene particles to simultaneously enter the interior of a special stirrer and uniformly stirring; after pouring the stirred mixture in a die and applying pressure of 400kilos, pushing the mixture in a greenhouse with 40DEG C and drying for one hour; and finally demoulding and cutting into boards with a certain specification by using a dicing saw. The fireproof foam board using polystyrene foam has the characteristics of excellent heat-insulating performance, reasonable formula, reached A-level fireproof property, environment protection, no pollution, and simple producing and mounting method.

The invention discloses an elevator safety system. The elevator safety system comprises an inflatable lifesaving device, a two-dimensional forked retractable speed reducing device, an in-car emergency response device, an outer-car emergency response device, an inflatable buffer device, a foot step type inflation electrical storage device, a foot step contact type limiting switch and an emergency start device. The emergency start device is provided with at least two gears including an upper gear and a middle gear; when the car descends normally, the emergency start device is at the middle gear, and a power supply of each device in linkage with the emergency start device is not in operation; when the car suddenly falls at a limit speed, the emergency start device is at the upper gear, and the power supply of each device in linkage with the emergency start device starts operating. When an elevator falls down, the elevator safety system is capable of reducing elevator falling speed and buffering impulsive force of a car falling to a well pit to enable the car to stably stop at the well pit, so that life safety of passengers in the elevator is effectively protected.

The invention discloses an emergency disaster situation display system and an emergency disaster situation display method based on multiple intelligent bodies, which can obtain disaster information in real time and can realize dynamic and multi-granularity three-dimensional display. The method comprises the following steps of: utilizing an SSHC (Scale Space Hierarchical Clustering) algorithm to process a remote sensing image to establish a hierarchical clustering tree; taking each node in the hierarchical clustering tree as a class; setting a surface feature corresponding to each class and establishing a three-dimensional model of each class; when a disaster situation is displayed, receiving a user instruction, wherein the user instruction comprises an expectedly-displayed surface feature A appointed by a user, and finding the expectedly-displayed surface feature A in the hierarchical clustering tree to be taken as a sub-tree of a tree root; creating collection intelligent bodies to collect data of bottom layer nodes in the sub-tree; creating organization intelligent bodies to collect data of other grades of the nodes except the bottom layer nodes from the collection intelligent bodies or the other organization intelligent bodies; rendering each type of the three-dimensional model according to the data of each node to form a three-dimensional geographic pattern of the surface feature A and displaying the three-dimensional geographic pattern; and displaying the three-dimensional geographic pattern with thinner granularity in the surface feature A.

The invention discloses a video analysis technique-based ship overload detection method, which comprises the following steps of: when a ship approaches a wharf, shooting video and image information of the ship by using a tripod head camera arranged on the wharf shore; accessing the shot video and image information to a video encoder to perform real-time encoding; calling the video and image information encoded by the video encoder by using a video analysis server, analyzing and processing the video and image information, and comparing the video and image information with safety management rules and user-defined conditions, if the video and image information cannot meet the safety management rules and the user-defined conditions, giving a warning message; and transmitting the video and image information decoded by a video decoder together with the warning message to a terminal display device for display. The invention also discloses a detection system for implementing the method; and by using the system to adopt the detection method, the working efficiency of maritime personnel is greatly improved, and the safety of ships is effectively guaranteed.

The invention discloses a bulletproof glass which comprises at least three layers of glass basic level. A layer of transparent plastic membrane is arranged between the adjacent two layers of glass basic level; at least one layer of a plurality of glass basic levels is a dimming glass layer which consists of two layers of ITO glass and polymer dispersion liquid crystal materials that are solidified between the two layers of the ITO glass. According to the technical proposal, the dimming glass layer is added on the basis of the present bulletproof glass; therefore the bulletproof glass is opaque in normal state and is transparent under a certain external voltage effect, thus, the transparent state and the opaque state can be switched quickly. When meeting attacks, the bulletproof glass can be switched to be the opaque state quickly to block out lines of sight of raiders, which leads the raiders not to aim at targets, thus protecting the life and property security of users effectively.