45results about How to "Shorten the alarm time" patented technology

The invention relates to a method and a system for monitoring and warning a pipeline landslide based on a fiber Bragg grating and a method for constructing the system. The monitoring is performed on four parts including landslide depth displacement, landslide surface displacement, thrust of landslide on a pipeline and pipeline strain, and comprises the steps of: firstly, inserting an inclinometerpipe (1) pasted with a fiber Bragg grating sensor from the landslide (13) to all potential sliding surfaces (15); secondly, embedding a slender concrete ground beam (2) of which two ends are fixedly restrained and the axial direction of a central reinforced bar (17) is stuck to a ground beam fiber Bragg grating sensor (20) in a direction vertical to the deformation direction of the landslide (13)below the surface of the landslide (13); thirdly, measuring the thrust of the landslide (13) on the pipeline by using an earth pressure cell fiber Bragg grating sensor (4) fixed on the pipeline (14);and fourthly, arranging monitoring sections on edges on two sides and the pipeline (14) in the center of the landslide (13), and uniformly arranging three pipe strain fiber Bragg grating sensors (3) on each monitoring section to monitor the axial strain of the pipeline (14).

The invention relates to a method and a system for monitoring and warning pipeline landslide depth displacement and a method for constructing the system. The monitoring is divided into three parts including landslide depth displacement monitoring, monitoring of thrust of landslide on a pipeline and pipeline strain monitoring, and comprises the steps of: inserting an inclinometer pipe (1) pasted with a fiber Bragg grating sensor into the landslide (13), penetrating all potential sliding surfaces (15), extending the inclinometer pipe to a drilling hole 3 to 5m deep under a bedrock surface, and measuring the maximum tension strain born by the inclinometer pipe (1); measuring the front thrust of the landslide (13) on the pipeline by using a packaged earth pressure cell fiber Bragg grating sensor (4) fixed on the pipeline (14); and uniformly arranging pipeline (14) monitoring sections on edges on two sides of the landslide and the pipeline (14) in the center of the landslide (13), and uniformly arranging three pipe strain fiber Bragg grating sensors (3) on each monitoring section to monitor the axial strain of the pipeline (14).

The invention discloses a road lamp management and taxi call automatic dispatching system based on the Internet of things. The system uses the road lamps spreading over roads in the city as the positioning and network basis and adopts the ZigBee wireless network and GPRS (General Packet Radio Service) / GSM (Global System for Mobile Communications) / 3G mobile communication network to realize two-way communication between the road lamps and a road lamp control station, between the passengers and a taxi management centre, between citizens and an alarm centre as well as between the taxi management centre and a vehicle-mounted taxi GPS terminal.

The invention relates to a method and a system for monitoring and warning pipeline landslide surface displacement and a method for constructing the system. The monitoring is divided into three parts including landslide surface displacement monitoring, monitoring of thrust of landslide on a pipeline and pipeline strain monitoring. The outputs of a ground beam fiber Bragg grating sensor (20) of a landslide surface displacement monitoring device, an earth pressure cell fiber Bragg grating sensor (4) of a monitoring device of the thrust of the landslide on the pipeline and a pipe strain fiber Bragg grating sensor (3) of a pipeline strain monitoring device are sequentially connected in series with an automatic optical switch (6), a fiber Bragg grating demodulator (7) and a host computer (8) ofan on-site monitoring station respectively. The output of the host computer (8) is connected with a GPRS transmission module (9); and the input of an inferior computer (11) with the outputs of an annunciator (12) and a display is connected by a GPRS receiving module (10) in an office.

The invention discloses a monitoring video recording method and device. The monitoring video recording method comprises the steps of receiving video stream data in allusion to a monitoring object, judging whether slicing processing is required to be performed on the video stream data or not, and if so, segmenting the video stream data into video stream segments and transmitting the video stream segments to a remote client. According to the method disclosed by the embodiment of the invention, the remote client does not need to wait the end of uploading of the video stream data, and can receive the video stream data recorded when the monitoring object has a special event in the uploading process of the video stream data, thereby shortening the waiting time of users, effectively solving a problem of check delay of the video stream data, and improving the user experience.

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 relates to a method and a system for monitoring and warning the influence of a landslide on a pipeline. The monitoring is divided into two parts including monitoring of thrust of the landslide on the pipeline and pipeline strain monitoring. The method for monitoring the thrust of the landslide on the pipeline comprises the steps of: using a packaged earth pressure cell fiber Bragg grating sensor (4) fixed on the pipeline (14) to measure the pressure, wherein a sensitive surface of the earth pressure cell fiber Bragg grating sensor (4) for sensing the pressure faces toward the sliding direction of the landslide (13), so the pressure measured by the earth pressure cell fiber Bragg grating sensor (4) is the front thrust of the landslide (13) on the pipeline. The method for monitoring pipeline strain comprises the steps of: uniformly arranging pipeline (14) monitoring sections on edges on two sides of the landslide (13) and the pipeline (14) at the central position of the landslide, wherein the interval of the monitoring sections is no more than 60m; and uniformly arranging three pipe strain fiber Bragg grating sensors (3) on each pipeline (14) monitoring section of the pipeline (14) to monitor the axial strain of the pipeline (14).

The invention discloses a network delay measurement method and device, electronic equipment and a storage medium. The method comprises the steps of obtaining a plurality of pairs of matched SYN packages and ACK packages from data packages transmitted between a client and a server and obtained by the network delay measurement device; carrying out IP address translation on each pair of SYN packet and ACK packet to obtain a region corresponding to each pair of SYN packet and ACK packet; according to the network time delay data of each region, obtaining network delay statistics of various regions,wherein the network time delay data of each region comprises arrival time differences of all pairs of SYN packets and ACK packets in the region, and the arrival time difference of each pair of SYN packets and ACK packets is the time difference of the SYN packets and ACK packets arriving at the network time delay measurement device. According to the network time delay measurement method and device, the electronic equipment and the storage medium, which are provided by the embodiment of the invention, the accuracy and real-time performance of the network time delay measurement result are improved.

The invention discloses a judgment method of a bonding behavior between a continuous casting slab and a crystallizer copper plate, and belongs to the technical field of metallurgical continuous casting processes. The judgment method comprises the following steps: (1) the temperature data acquisition, preprocessing and storage of thermocouples in the crystallizer copper plate are performed; (2) the temperature rise abnormity inspection of single thermocouple is performed through the temperature change speed of the thermocouples; (3) the longitudinal bonding propagation model inspection between rows of the thermocouples with temperature rise abnormity and adjacent rows is performed to calculate the total number of the thermocoupls with temperature rise abnormity and satisfying the model inspection as X; and (4) the judgment of bonding alarming or bonding warning is performed according to the total number of the thermocoupls with temperature rise abnormity and satisfying the model inspection. The judgment method realizes judging timeliness and accuracy of casting slab bonding, shortens the alarming response time as far as possible, and reduces the wrong report frequency when guaranteeing 100% of bonding report rate.

The invention discloses a smart watch with an emergency calling function and a smart watch system, belongs to the field of watches and aims to solve the technical problems that an existing smart watchcannot perform emergency calling, and less information is provided for rescue teams. The smart watch structurally comprises a watch terminal, a power module, a clock module and a display screen, thepower module, the clock module and the display screen are arranged at the watch terminal, the display screen is connected with the clock module, the watch terminal is further provided with an audio and video acquisition module, a wireless communication module, a position acquisition module, an alarm module, an emergency calling key and a one-key calling APP (application), the audio and video acquisition module, the position acquisition module and the alarm module can be driven to simultaneously start by triggering the emergency calling key under calling of the one-key calling APP, and the wireless communication module can be called to transmit audio information, video information, current position information and alarm information to a remote alarm receiving center. The system comprises the remote alarm receiving center and a plurality of smart watches with the emergency calling function.

The invention discloses an alarm for a mobile phone. The alarm comprises an alarm signal transmission module and an alarm implementation module, wherein the alarm signal transmission module is arranged outside the mobile phone, and is used for transmitting an alarm signal to the alarm implementation module when an alarm signal triggering condition is satisfied; and the alarm implementation module is arranged in the mobile phone, receives the alarm signal through the mobile phone, and controls the mobile phone to give an alarm according to a preset rule. The invention also discloses an alarming method for the mobile phone. According to the alarm and the alarming method, the mobile phone is not required to be operated, only the alarm signal transmission module outside the mobile phone is required to transmit the alarm signal, and then the mobile phone can be automatically used for automatically giving the alarm, so that alarming time is greatly reduced.

The invention discloses a method for determining the rapid air leakage of a tyre. The method comprises the following steps: 1, detecting the pressure of the tyre each 6s; 2, executing step 3 if one detected pressure value is above 0.30bar lower than a last detected pressure vale, and returning to step 1 if not; 3, detecting the pressure of the tyre at the seventh second, and determining whether the obtained seventh-second pressure value of the tyre is equal to or greater than 0.04bar lower than the sixth-second pressure value, executing step 4 if the seventh-second pressure value is equal to or greater than 0.04bar lower than the sixth-second pressure value, and returning to the step 1 if not; and 4, detecting the eight-second pressure of the tyre, determining whether the obtained eighth-second pressure value of the tyre is equal to or greater than 0.04bar lower than the seventh-second pressure value, timely alarming if the eighth-second pressure value of the tyre is equal to or greater than 0.04bar lower than the seventh-second pressure value, and returning to the step 1 if not, wherein a case that the eighth-second pressure value of the tyre is equal to or greater than 0.04bar lower than the seventh-second pressure value shows that the air leakage of the tyre is fast carried out. The method of the invention can improve the detection of the rapid air leakage of the tyre and the alarming speed of a tyre pressure monitoring system.

The invention discloses a roadway surrounding rock mass separation layer monitoring and early warning device, and belongs to the technical field of roadway safety monitoring and early warning. The device is composed of a monitoring and early warning terminal, anchor heads, steel wire ropes, a friction bracket, a tension screw, a sleeve and a displacement sensor. The monitoring and early warning terminal comprises a microprocessor, a storage module, a control module, a communication module, an acousto-optical alarm whistle, an input port and an output port. The anchor heads connected with the steel wire ropes are fixed to the deep portion of a drilled hole; the measuring sleeve is fixed into the drilled hole through the friction bracket; the change condition of a roadway (or tunnel) surrounding rock mass separation layer is measured out through the displacement sensor; the monitoring and early warning terminal automatically completes sampling, analytical judgment, storing, transferring, alarming and other functions; when the displacement amount or the displacement speed of a monitoring point exceeds the early warning threshold value, alarming is automatically conducted; and the device can achieve parameter setting and measuring data output by being connected with a laptop. The important effect on shortening alarming time and decreasing casualties and property losses are achieved by adopting the device.

The invention discloses a fire alarm robot for transformer substations and inflammable places. The fire alarm robot comprises a transmission system, direct-current motor driving modules, flame sensors, smoke sensors, tracking modules, an ultrasonic module, an active buzzer module, a communication module, a single-chip microcomputer, a remote control module, a power source system and a fixing plate, wherein the direct-current motor driving modules, the flame sensors, the smoke sensors, the tracking modules, the ultrasonic module, the active buzzer module, the communication module, the remote control module and the power source system are connected with the single-chip microcomputer. The fire alarm robot has the advantages that accuracy and instantaneity of fire alarm are improved, detection blind zones are eliminated, time for fire alarm is shortened, fire damage is effectively reduced, manpower inspection tour is substituted and cost is reduced.

The invention discloses a bi-directional single fiber optical module and an optical path detection method. The optical path detection method is applied to the bi-directional single fiber optical module and comprises the following steps: after a sense command sent from an optical line terminal managing the optical module is received by an optical path detection interface on the optical module, transmitting the optical path detection light of wavelength different from the wavelengths of the service uplink light and the service downlink light of the optical line terminal; outputting the optical path detection light to an optical fiber interface, and receiving the reflected light of the optical path detection light transmitted from the optical fiber interface; after the reflected light is converted into an electrical signal, carrying out data processing to the electrical signal; and transmitting data obtained after processing to the optical line terminal via the optical path detection interface. The optical path detection method does not disturb normal service operation, the original equipment and light path detection characteristics are organically combined to satisfy the desire of operators that optical fiber faults can be detected with the traditional equipment, operation maintenance and alarm time is greatly shortened, and the operation cost of the operators is reduced.

The invention discloses a supply device and method for long reinforcing steel bars in four-side-ribbed high-speed-rail reinforcing steel bar meshes, and belongs to the field of cold-rolled reinforcingsteel bars. The supply device comprises a reinforcing steel bar coil unwinding device, a reinforcing steel bar straightening roller device, one or more hydraulic reinforcing steel bar shearing devices, a rib arranging stand of a reinforcing steel bar mesh welding device and a moving frame which are arranged sequentially; the moving frame is arranged on the rib arranging stand; a long reinforcingsteel bar fixed-length baffle is arranged on the moving frame; the one or more hydraulic reinforcing steel bar shearing devices are arranged in front of the rib arranging stand; at least one driving roller is arranged in the reinforcing steel bar straightening roller device; and multiple sensors and a controller are arranged in the supply device. By the aid of the supply device, production links of the reinforcing steel bar are reduced, the problem of inconsistency of the parallelism of the reinforcing steel bars during bundling and carrying of the reinforcing steel bars is reduced, the alarming, shutdown or maintenance time of the device is shortened, the running rate of the device is increased, and the percent of pass of the yield strength of the straightened reinforcing steel bars is increased.

The invention relates to a preparation method and application of a flame-retardant coated fabric based on graphene oxide. The preparation method comprises the following steps: firstly immersing a cotton fabric in a graphene oxide aqueous dispersion to obtain a graphene oxide-coated cotton fabric, then immersing the graphene oxide-coated cotton fabric in a DMAEMA solution, carrying out ultravioletillumination to obtain a graphene oxide / PDMAEMA-coated cotton fabric, and finally, immersing the graphene oxide / PDMAEMA coated cotton fabric into ultrasonically treated hexagonal boron nitride nanosheet dispersion liquid to prepare the graphene oxide / PDMAEMA / hexagonal boron nitride sandwich-shaped layered nano-coating flame-retardant cotton fabric. The graphene oxide / PDMAEMA / hexagonal boron nitride sandwich-shaped layered nano-coating flame-retardant cotton fabric can be used for preparing a large-area fire early-warning sensor. The large-area fire early-warning sensor prepared from the flame-retardant coated fabric based on graphene oxide can realize large-area sensing, and is short in alarm time.

The invention discloses a high-usability high-reliability and high-efficiency fire evacuation indicating system and a method. The system adopts a three-layer system structure formed by an evacuation indicating control host machine, passageway evacuation indicating control sub machines and passageway detection / indicating devices, wherein the passageway evacuation indicating control sub machines are positioned at stairs of each floor, each unit of the system exchanges information through an element interconnect bus (EIB), and the passageway detection / evacuation indicating devices are directly embedded into the control sub machines. Wireless backup communication is additionally added between the host machine and the sub machines (the passageway detection / evacuation indicating devices), and the integral reliability and the usability of the system are enhanced. The secondary threshold warning strategy of a composite fire hazard detector is adopted, a corresponding information processing method is used as an auxiliary measure, in addition, evacuation paths are continuously regulated according to the real-time fire conditions, the goals of shortening the warning time and reducing the mistake warning rate are reached, and the usability of the evacuation indicating system is further improved. The space positions of the detection / indicating devices are shown according to the floors on the basis of the three-dimensional geographical characteristics of the tall building evacuation paths, the building typical evacuation structure and the Dijkstra algorithm with an improved data structure are adopted, and the route planning efficiency of the escape route is improved.

The invention discloses an optical fiber vibration event identification method based on spectrum similarity. A waveform similarity expected value generated by optical fiber vibration is preset. When an optical fiber vibrates, waveform data of the optical fiber vibration is taken, and a waveform similarity degree is calculated according to frequency and amplitude data. By calculating the waveform similarity and comparing the waveform similarity with a preset expected value, whether the alarm is a false alarm caused by vibration generated by an external environment or an alarm caused by an internal fault of an optical fiber is judged according to a difference value. Through the calculation method, the waveform similarity can be quickly calculated, if the similarity reaches an expected value, the two waveform generation behaviors are considered to be consistent, the vibration behavior can be quickly determined, the calculation time is saved, meanwhile, the accuracy of behavior mode recognition is improved, the vibration event is quickly recognized by simplifying the calculation method. The alarm efficiency is improved by reducing the alarm time.

The invention relates to an optimized critical accident alarm method and system. The method comprises the following steps: acquiring detector data according to a preset acquisition period; accumulating the acquired data of each acquisition period to obtain an accumulated value; when the accumulated value reaches a preset value, calculating and storing an accumulated dose rate according to the accumulated value and the current accumulated time; when the preset maximum time is reached but the accumulated value does not reach the preset value, calculating and storing an accumulated dose rate according to the accumulated value and the maximum time; and comparing the accumulated dose rate with an alarm threshold, and determining whether to give an alarm or not according to a comparison result.The system comprises a data acquisition module, a data accumulation module, a first data calculation module, a second data calculation module and an alarm module. The beneficial effects of the invention are that the method carries out the data collection in a period far less than a conventional data collection period, can timely find a critical accident state and give an alarm, shortens the alarmtime under a critical accident, and enables the provided data to be more detailed and precise because of the short collection period.

The invention provides a passenger emergency braking and alarm linkage control system and method and a rail vehicle. If a passenger emergency braking device is triggered, a passenger emergency alarm is automatically activated, and an emergency braking system automatically applies vehicle emergency braking; through information transmission of a vehicle control and management system, a passenger information display system sends a monitoring image of the position of the activated passenger alarm to a ground operation control center, and the ground operation control center can send a corresponding control instruction to the vehicle according to the monitoring image. According to the invention, passenger emergency braking and passenger emergency alarm are linked, so that passenger alarm actions under emergency conditions are reduced, the alarm time is saved, and the efficiency is improved.

The invention discloses a method for detecting thermal runaway of a lithium battery based on an infrared thermal imager, which is characterized by comprising the following steps: (1) detecting an infrared ray specific wave band signal of thermal radiation of an object by using a photoelectric technology through the infrared thermal imager, and converting the signal into an image and a graph which can be visually distinguished by human beings; (2) carrying out graph preprocessing on the images, carrying out denoising by utilizing a median filtering method, and framing a candidate region; and (3) carrying out non-maximum suppression (NMS) processing on the candidate area to obtain a motion area with the highest temperature, calculating the highest temperature of the motion area, and judging whether the highest temperature exceeds a preset threshold value or not so as to judge whether to give an alarm or not. The invention has the following beneficial effects: (1) the alarm time is shortened; (2) an alarm area can be visually observed, and time is won for rescue; and (3) the invention can adapt to different lithium battery transportation and storage environments by adjusting the set alarm threshold value, and the fire monitoring efficiency is improved.

The invention relates to a method and a system for monitoring and warning a pipeline landslide based on a fiber Bragg grating and a method for constructing the system. The monitoring is performed on four parts including landslide depth displacement, landslide surface displacement, thrust of landslide on a pipeline and pipeline strain, and comprises the steps of: firstly, inserting an inclinometerpipe (1) pasted with a fiber Bragg grating sensor from the landslide (13) to all potential sliding surfaces (15); secondly, embedding a slender concrete ground beam (2) of which two ends are fixedly restrained and the axial direction of a central reinforced bar (17) is stuck to a ground beam fiber Bragg grating sensor (20) in a direction vertical to the deformation direction of the landslide (13)below the surface of the landslide (13); thirdly, measuring the thrust of the landslide (13) on the pipeline by using an earth pressure cell fiber Bragg grating sensor (4) fixed on the pipeline (14);and fourthly, arranging monitoring sections on edges on two sides and the pipeline (14) in the center of the landslide (13), and uniformly arranging three pipe strain fiber Bragg grating sensors (3) on each monitoring section to monitor the axial strain of the pipeline (14).

The invention relates to a living article, and discloses a navigation umbrella. The navigation umbrella comprises an umbrella surface, an umbrella center bar, an upper nest rotatably arranged on the umbrella center bar and a lower nest movably sleeving the umbrella center bar; the umbrella surface is provided with an arrow part for pointing, a shell is slidingly arranged on the umbrella center bar, a control panel which is in wireless or wired connection with mobile equipment is arranged in the shell, a micromotor connected with the control panel is arranged in the umbrella center bar, an output shaft of the micromotor is connected with the upper nest, the control panel receives a navigation signal to send an instruction to the micromotor, and the micromotor works to drive the upper nest and the arrow part to rotate. According to the navigation umbrella, the umbrella surface is provided with the arrow part, the control panel is connected with a navigation APP of a mobile phone, and controls the micromotor to rotate the arrow part according to navigation information of the navigation APP, the arrow part points to the navigation direction, a user slightly looks up at the direction ofthe arrow part to be capable of seeking a way, and hidden danger is reduced.

The invention discloses a method for triggering automatic alarm of equipment and the equipment thereof. The method comprises the following steps: acquiring alarm triggering information; comparing theacquired alarm triggering information with preset alarm triggering conditions in a database; and if the acquired alarm triggering information is consistent with the preset alarm triggering condition in the database, triggering the equipment to automatically implement corresponding alarm measures. According to the method for triggering the equipment to automatically give the alarm and the equipmentthereof, the alarm is automatically triggered through the obtained alarm triggering information, so that the automation degree is high; alarm time is saved, and a police officer can timely and effectively control the site; and the alarm mode is hidden, and the situation can be effectively prevented from being further deteriorated.

The invention relates to an optimized critical accident alarm method and system. The method includes: collecting detector data according to a preset collection period; accumulating the collected data in each collection period to obtain an accumulated value; when the accumulated value reaches the preset value , calculate and store the accumulated dose rate according to the accumulated value and the current accumulated time; when the preset maximum time is reached but the accumulated value fails to reach the preset value, calculate and store the accumulated dose rate according to the accumulated value and the maximum time; compare the accumulated dose rate and the alarm threshold, and decide whether to alarm according to the comparison result. The system includes: a data acquisition module, a data accumulation module, a first data calculation module, a second data calculation module and an alarm module. The beneficial effects of the present invention are as follows: the present invention adopts a data collection period much shorter than that of the conventional one for data collection, can detect critical accident states in time and give an alarm, shortens the alarm time under critical accidents, and provides more detailed and accurate data due to the short collection period .

The invention discloses a multifunctional air purifier which comprises a face shell, the face shell comprises a cover part and a rod body, a plurality of evenly-arranged first air inlet holes are formed in the top face of the cover part, the rod body is located on the top face of the cover part, the multifunctional air purifier further comprises a circuit board, and the circuit board is arranged between the face shell and a bottom shell. A carbon monoxide sensor, a fuel gas sensor, a smoke sensor, a central processing unit, a WIFI module, a buzzer and a warning lamp are installed on the base shell, an air blower and a negative ion generator are arranged in an inner cavity of the base shell, a wall hanging hole is formed in the bottom of the base shell, and an air outlet grid is arranged on the edge surrounding portion of the base shell. According to the air purifier, when air in a house is purified, various dangerous conditions in the house can be prevented, even if dangers occur, the dangers can be known remotely, the alarm time can be effectively shortened, and losses are reduced.

The invention discloses a judgment method of a bonding behavior between a continuous casting slab and a crystallizer copper plate, and belongs to the technical field of metallurgical continuous casting processes. The judgment method comprises the following steps: (1) the temperature data acquisition, preprocessing and storage of thermocouples in the crystallizer copper plate are performed; (2) the temperature rise abnormity inspection of single thermocouple is performed through the temperature change speed of the thermocouples; (3) the longitudinal bonding propagation model inspection between rows of the thermocouples with temperature rise abnormity and adjacent rows is performed to calculate the total number of the thermocoupls with temperature rise abnormity and satisfying the model inspection as X; and (4) the judgment of bonding alarming or bonding warning is performed according to the total number of the thermocoupls with temperature rise abnormity and satisfying the model inspection. The judgment method realizes judging timeliness and accuracy of casting slab bonding, shortens the alarming response time as far as possible, and reduces the wrong report frequency when guaranteeing 100% of bonding report rate.

The invention discloses a flame-retardant modified graphene oxide film. The flame-retardant modified graphene oxide film is produced from, by weight, 0.1-0.6 part of ascorbic acid, 1 part of grapheneoxide and 0.1-0.5 part of a silane coupling agent. A production method of the flame-retardant modified graphene oxide film comprises the following steps: preparing an aqueous solution by using graphene oxide, adding the silane coupling agent and L-ascorbic acid, performing stirring, removing bubbles as possible, and drying the obtained solution to obtain the film. A low-temperature fire early warning device is constructed on the basis of the film. The device is formed through sequentially connecting a low-voltage safety battery, a warning lamp and the modified graphene oxide film by lead wires. Silanization treatment is adopted to realize the synergistic flame retardancy of the graphene oxide and silicone and enhancement of the thermal stability of the structure, and the addition of the L-ascorbic acid can enhance the thermal reaction of graphene oxide at a low temperature, so the silane and L-ascorbic acid synergistically-modified graphene oxide film produced in the invention reducesthe response temperature of early warning, greatly shortens the early warning time, and can maintain the skeleton at a high temperature or in a flame in order to continuously give an alarm.