CN105999605A - Intelligent prewarning device based on indoor LED visible light communication lifi technology - Google Patents
Intelligent prewarning device based on indoor LED visible light communication lifi technology Download PDFInfo
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- CN105999605A CN105999605A CN201610342297.9A CN201610342297A CN105999605A CN 105999605 A CN105999605 A CN 105999605A CN 201610342297 A CN201610342297 A CN 201610342297A CN 105999605 A CN105999605 A CN 105999605A
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
- A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- Emergency Management (AREA)
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Alarm Systems (AREA)
Abstract
The invention discloses an intelligent prewarning device based on an indoor LED visible light communication lifi technology. The device comprises a user terminal, an intelligent mobile phone, a Pc computer or tablet computer, a bridging circuit for connecting a user end USB interface with a light transceiver circuit and receiving or sending signals converted from computer USB data signals, a light emitter for encoding and modulating the signals processed by a USB interface circuit and sending the modulated signals to a modulation light source central processing unit after amplification, and a sound intensity detecting circuit and an electric warning circuit connected with the central processing unit; and the electric warning circuit is connected with a spraying pump start circuit. The device is simple in structure and reasonable in design, adopts a digital signal processing technology to perform multiple data treatment, controls the spraying pump start circuit to start a spraying pump when using the electric warning circuit for warning, and can timely supply a water source to a spraying system to achieve the automatic spraying purpose.
Description
Technical field
The present invention relates to blowing control field, specifically, be a kind of intelligent early-warning device based on indoor LED visible light communication lifi technology.
Background technology
Fire refers to the disaster that the most out of control burning is caused.In various disasters, fire be most frequently, one of the major casualty threatening public security and social development the most at large.Fire can be utilized and control by the mankind, is an important symbol of civilization and progress.The history that the mankind use fiery history and same fire to struggle thus is interpromoting relation in five elements together, and people, while with fire, constantly sum up the rule that fire occurs, are reduced as far as fire and the harm causing the mankind thereof.
In the place that current majority is subject to fire, fire-fighting system will be installed, and fire automatic sprinkler fire-extinguishing system, but, present fire-fighting system alarm unit is the most single, reaction is slow, spread speed efficiency is low, simply there is fire alarm function, and can not reach Synchronization Control and start the requirement of spray pump.
Visible light communication technology, be the high speed light and shade flash signal being invisible to the naked eye utilizing fluorescent lamp or light emitting diode etc. to send to transmit information, spread speed is fast, early warning is sharp.The system utilizing this technology to make can cover the most in good time, energy-conservation, the early warning, controlling system that indoor light reaches, it is not necessary to electric wire connects, thus has DEVELOPMENT PROSPECT widely.
Summary of the invention
It is an object of the invention to provide a kind of intelligent early-warning device based on indoor LED visible light communication lifi technology, simple in construction, reasonable in design, Digital Signal Processing is used to carry out multiple data process, and control spray pump start-up circuit carries out the startup of spray pump while utilizing electronic circuit for alarming to report to the police, so as to provide water source to reach the purpose of automatic spray to spray system timely.
The present invention is achieved through the following technical solutions: a kind of intelligent early-warning device based on indoor LED visible light communication lifi technology, including user side, the management software on smart mobile phone, Pc computer or panel computer;
Bridgt circuit, is used for connecting user side USB interface and light transmission circuit, accepts or launches the signal carrying out conversion process from computer usb data signal；
Optical sender, carries out coded modulation by the signal processed through usb circuit, and modulated signal sends to modulated light source again after amplifying；
Photoreceiver, sends, transmitting terminal, the light pulse signal come by optical antenna and converges to photoelectric detector PIN, the optical signal of reception is converted into telecommunications;
Described optical sender includes light source and driver and auxiliary circuit；Described auxiliary circuit includes light detection device, without optical alarm circuit, automatic power control circuit and automatic temp. controlling circuit；During use, the signal of telecommunication is input to driver, described driver is connected with light source, automatic temp. controlling circuit regulation and control light-source temperature, described light detection device is arranged in light source range of exposures, and be connected with without optical alarm circuit, described light detection device and an automatic power control circuit constitute feedback circuit with driver after connecting；
Described optical receiver circuit includes that photodetector, amplifying circuit and signal processing circuit, described signal processing circuit include low noise preamplifier, main amplifier, equalizer, agc circuit；During use, the described digital optical signal through intensity modulated, photoelectric detector uses direct detection mode to receive optical signal at receiving terminal, low noise preamplifier, main amplifier, equalizer constitute the linear passageway of photoreceiver, agc circuit connects between main amplifier and equalizer, complete optical electrical conversion, the signal level needed for optical signal amplification to judgement regenerative circuit
Central processing unit, and the sound intensity testing circuit that is connected with central processing unit and electronic circuit for alarming composition, it is characterised in that: on described electronic circuit for alarming, it is also associated with spray pump start-up circuit.
Its operation principle and effect:
nullThrough the smog information that on-the-spot photoreceiver will process、Intensity information、The flow of information such as temperature information and the corresponding level signal that obtains，It is received by the central processing unit being connected with on-the-spot sensing sources、Process and analyze，There is this situation of fire in the scene of drawing，User side is according to smog information、Intensity information、The big data of the flow of information such as temperature information carry out early warning analysis，Occur that emergency sends instruction to central processing unit，Optical sender is sent an electronic alarm command to electronic circuit for alarming by central processing unit，The sound-producing device triggered on electronic circuit for alarming is reported to the police，At the same time，Electronic circuit for alarming will transmit the analogue signal operating mechanism to spray pump start-up circuit，Control spray pump by operating mechanism to start，Thus reach to provide water source to spray system，So that spray system carries out the purpose of automatic spray；Sound intensity testing circuit synchronous monitoring scene volume, sound beyond the chimes of doom detecting scene will send an instruction strengthening chimes of doom to electronic circuit for alarming by central processing unit more than after chimes of doom so that the output of the audible device VOLUME UP of electronic circuit for alarming.
To better implement the present invention, being also associated with sound circuit and electroacoustic alarm circuit on described central processing unit, described sound circuit connects electroacoustic alarm circuit.In use, central processing unit will send an instruction starting sound circuit, the voice messaging being stored in sound circuit will carry out voice alarm by the audible device on electroacoustic alarm circuit, on-the-spot personnel are reminded to carry out safe and orderly withdrawing, central processing unit will detect the address code of electroacoustic alarm circuit simultaneously, quickly draw the accurate location of this electroacoustic alarm circuit, to send voice message, escape way distribution situation herein, allows the personnel in region herein can evacuate to safety area quickly, in order, accurately.
To better implement the present invention, described central processing unit is also associated with audible-visual annunciator.Central processing unit is after the on-the-spot breaking out of fire of analyzing and processing, an instruction will be sent to the audible-visual annunciator being arranged on scene the most simultaneously, the form of audible-visual annunciator acousto-optic reminds the personnel in region to have occurred and that fire herein, just will quickly withdraw herein after personnel find the specific acousto-optic of audible-visual annunciator herein, the life having reached oneself not be threatened.
To better implement the present invention, described central processing unit is also associated with GPRS telecommunication circuit.Central processing unit is simultaneously emitted by one containing the transmission when, where occurring the fire information of which kind of rank to be carried out fire-fighting link by GPRS telecommunication circuit, fire department, on-the-spot director, periphery neighbours can be known timely fire alarm occurs herein such that it is able to necessary emergency measure is provided, helps measure, control measures and risk avoidance measures.
To better implement the present invention, described central processing unit is also associated with man-machine interface circuit.Being arranged at the keyboard within man-machine interface circuit, display screen, by visual by such as intensity of sound, the information such as position, scene of fire shows, and can be carried out the corresponding regulation of this device by input through keyboard, makes this device be chronically at optimum duty.
To better implement the present invention, central processing unit uses TMS570LS1114 microcontroller.
TMS570LS1114 device is a high-performing car level security system microcontroller series.This security architecture includes: the double-core CPU, CPU that run with lock-step mode and memory built-in self-inspection (BIST) logic, the ECC on flash memory and data SRAM, the even-odd check of peripheral memory, the return circuit on peripheral hardware I/O.
TMS570LS1114 device is integrated with ARM Cortex-R4F floating-point CPU, this CPU and provides efficient 1.66 DMIPS/MHz, and has the configuration that can run with up to 180MHz, thus provides up to 298DMIPS.Constant big end sequence [BE32] form of word supported by this device.
TMS570LS1114 device has 1MB integrated flash memory and 128KB data RAM, and this configuration has the error correction of single position and dibit error correction.Flash memories on this device is non-volatile a, electric erasable realized by 64 bit wide data bus interfaces and programmable memory.In order to realize all readings, programming and erasing operation, it is upper (with the level as I/O power supply) that this flash memory operates in a 3.3V power supply input.When being in pipelined mode, flash memory can run under the system clock frequency of up to 180MHz.SRAM supports that in the frequency range of whole support the monocycle of byte, half son, word and double word pattern reads and write-access.
TMS570LS1114 device is peculiar for based on the peripheral hardware controlled in real time, including 2 next generation's high-end intervalometer (N2HET) sequential coprocessors, this coprocessor has up to 44 I/O terminals, 7 enhancement mode pulse width modulator (ePWM) modules supporting up to 14 outputs, 6 enhancement mode catch (eCAP) module, 2 enhancement mode orthogonal encoder pulse (eQEP) modules, and 2 12 analog-digital converters (ADC) supporting up to 24 inputs.
Invention compared with prior art, has the following advantages and beneficial effect:
Present configuration is simple, and reasonable in design, hardware circuit is small and exquisite, easy to use, and service behaviour is good；Energy-saving and environmental protection, reaction acumen；Point-to-point double-direction radio optic communication is realized, it is ensured that the job stability of circuit between computer；Even if there is voltage drift phenomenon during high voltage output, as long as signal remains in that balance, the cross interference that this circuit causes is the most relatively small；In the case of there is the front stage circuits of easy generation parasitism, in view of this circuit common-mode gain is relatively low, so the probability that it introduces unwanted oscillation to prime is the least.Use Digital Signal Processing to carry out multiple data process, and control spray pump start-up circuit while utilizing electronic circuit for alarming to report to the police and carry out the startup of spray pump, so as to provide water source to reach the purpose of automatic spray to spray system timely.The present invention can remind the escape way distribution situation of scene of fire by electroacoustic alarm, and where is safety area, and reminds scene of fire personnel to carry out orderly withdrawing scene, it is to avoid causes confusion because of panic, causes the accident that should not occur.The present invention carries out the transmission of fire-fighting link by GPRS telecommunication circuit so that fire department, on-the-spot director, periphery neighbours can know timely fire alarm occurs herein such that it is able to provides necessary emergency measure, help measure, control measures and risk avoidance measures；It is provided with the man-machine interface circuit for man-machine interaction, in order to carry out corresponding dialogue between people with machine simultaneously.Digital Signal Processing high-performance of the present invention, the digital signal processing chip of low-power consumption, be internally integrated Various Components, it is possible to quickly, efficiently, accurately to data carries out Treatment Analysis.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1:
A kind of intelligent early-warning device based on indoor LED visible light communication lifi technology, a kind of intelligent early-warning device based on indoor LED visible light communication lifi technology, simple in construction, reasonable in design, Digital Signal Processing is used to carry out multiple data process, and control spray pump start-up circuit carries out the startup of spray pump while utilizing electronic circuit for alarming to report to the police, so as to provide water source to reach the purpose of automatic spray to spray system timely.
The present invention is achieved through the following technical solutions: a kind of intelligent early-warning device based on indoor LED visible light communication lifi technology, including user side, the management software on smart mobile phone, Pc computer or panel computer;
Bridgt circuit, is used for connecting user side USB interface and light transmission circuit, accepts or launches the signal carrying out conversion process from computer usb data signal；
Optical sender, carries out coded modulation by the signal processed through usb circuit, and modulated signal sends to modulated light source again after amplifying；
Photoreceiver, sends, transmitting terminal, the light pulse signal come by optical antenna and converges to photoelectric detector PIN, the optical signal of reception is converted into telecommunications;
Described optical sender includes light source and driver and auxiliary circuit；Described auxiliary circuit includes light detection device, without optical alarm circuit, automatic power control circuit and automatic temp. controlling circuit；During use, the signal of telecommunication is input to driver, described driver is connected with light source, automatic temp. controlling circuit regulation and control light-source temperature, described light detection device is arranged in light source range of exposures, and be connected with without optical alarm circuit, described light detection device and an automatic power control circuit constitute feedback circuit with driver after connecting；
Described optical receiver circuit includes that photodetector, amplifying circuit and signal processing circuit, described signal processing circuit include low noise preamplifier, main amplifier, equalizer, agc circuit；During use, the described digital optical signal through intensity modulated, photoelectric detector uses direct detection mode to receive optical signal at receiving terminal, low noise preamplifier, main amplifier, equalizer constitute the linear passageway of photoreceiver, agc circuit connects between main amplifier and equalizer, complete optical electrical conversion, the signal level needed for optical signal amplification to judgement regenerative circuit
Central processing unit, and the sound intensity testing circuit that is connected with central processing unit and electronic circuit for alarming composition, it is characterised in that: on described electronic circuit for alarming, it is also associated with spray pump start-up circuit.
Its operation principle and effect:
nullThrough the smog information that on-the-spot photoreceiver will process、Intensity information、The flow of information such as temperature information and the corresponding level signal that obtains，It is received by the central processing unit being connected with on-the-spot sensing sources、Process and analyze，There is this situation of fire in the scene of drawing，User side is according to smog information、Intensity information、The big data of the flow of information such as temperature information carry out early warning analysis，Occur that emergency sends instruction to central processing unit，Optical sender is sent an electronic alarm command to electronic circuit for alarming by central processing unit，The sound-producing device triggered on electronic circuit for alarming is reported to the police，At the same time，Electronic circuit for alarming will transmit the analogue signal operating mechanism to spray pump start-up circuit，Control spray pump by operating mechanism to start，Thus reach to provide water source to spray system，So that spray system carries out the purpose of automatic spray；Sound intensity testing circuit synchronous monitoring scene volume, sound beyond the chimes of doom detecting scene will send an instruction strengthening chimes of doom to electronic circuit for alarming by central processing unit more than after chimes of doom so that the output of the audible device VOLUME UP of electronic circuit for alarming.
To better implement the present invention, being also associated with sound circuit and electroacoustic alarm circuit on described central processing unit, described sound circuit connects electroacoustic alarm circuit.In use, central processing unit will send an instruction starting sound circuit, the voice messaging being stored in sound circuit will carry out voice alarm by the audible device on electroacoustic alarm circuit, on-the-spot personnel are reminded to carry out safe and orderly withdrawing, central processing unit will detect the address code of electroacoustic alarm circuit simultaneously, quickly draw the accurate location of this electroacoustic alarm circuit, to send voice message, escape way distribution situation herein, allows the personnel in region herein can evacuate to safety area quickly, in order, accurately.
Bridgt circuit: connect USB interface of computer and light transmission circuit, become to be suitable for the signal of radiating circuit modulation by carrying out conversion process from computer usb data signal, the signal that reception circuit is sent here is changed being processed into usb data signal simultaneously and gives computer, it is achieved the wireless duplex communication of two-forty.
Optical sender: the signal processed through usb circuit is carried out coded modulation, modulated signal sends to modulated light source visible LED one by one again after amplifying, make its send be encoded the signal of telecommunication modulation visible ray light pulse signal (this process is referred to as electro-optic conversion, i.e. E/O changes), after in optical antenna is transmitted into atmospheric channel.
Photoreceiver: by optical antenna, transmitting terminal is sent the light pulse signal come and converge to photoelectric detector PIN, the optical signal of reception is converted into the signal of telecommunication, and (this process is referred to as opto-electronic conversion, i.e. O/E changes), the ultra-weak electronic signal that conversion comes gives usb circuit after amplifying demodulation.
Described optical sender includes light source and driver and auxiliary circuit.Described auxiliary circuit includes light detection device, without optical alarm circuit, automatic power control circuit (APC) and automatic temp. controlling circuit (ATC)；During use, the signal of telecommunication is input to driver, described driver is connected with light source, automatic temp. controlling circuit regulation and control light-source temperature, described light detection device is arranged in light source range of exposures, and be connected with without optical alarm circuit, described light detection device and an automatic power control circuit constitute feedback circuit with driver after connecting.
Preferably, described light source works wave band is HONGGUANG 650nm, compared with green glow and blue light, when HONGGUANG is transmitted in atmospheric channel, has certain advantage in the resistivity to the fluorescence in background noise and ultraviolet.
Preferably, described transmitter circuitry uses the red light-emitting diode (LED) light source as transmitter of 650nm.For indoor portable radiotelephone optical transmission device, light source must is fulfilled for following basic requirement: meet eye-safe requirement；Modulation rate meets design and requires (>=10Mb/s)；Service life is long；Price is low, reduces cost.Described LED drive circuit uses difference channel.
Described optical receiver circuit includes photodetector, amplifying circuit and signal processing circuit, digital optical signal for intensity modulated, when receiving terminal uses direct detection mode, the main linear passageway being made up of photoreceiver photoelectric detector, low noise preamplifier, main amplifier, agc circuit etc., to complete optical electrical conversion, signal is amplified to the signal level needed for decision circuit.
In optical communication system, the effect of receiver is to be changed into the signal of telecommunication receiving optical signal.First the faint optical signal after the channel transmission sent by optical sender by photodetector (can be PIN photodiode, it is also possible to be PAD avalanche photodide) is changed into the signal of telecommunication.The output signal electric current of photodetector is the least, it is necessary to be amplified by low noise, wide band preamplifier.Photodetector and preamplifier constitute photoreceiver front-end, and its noiseproof feature will be the main because of family of decision receiving sensitivity.Main amplifier, equalizer and agc circuit signal is carried out the amplification of high-gain and signal is compensated, shaping, to improve signal to noise ratio, to reduce the bit error rate, make the pulse of output be suitable for the requirement of judgement.
Described low noise preamplifier is broadband, low-noise amplifier, because circuit operating rate is higher, is preferably, and LNA uses trans-impedance amplifier.
Iin is the photogenerated current of photodetector, and Ay is ideal amplifier.Negative feedback network Rf therein detects output end voltage and feeds back to input in the form of electric current.On the one hand the amplifier of this form ensure that it has less input impedance, such that it is able to the photoelectric current that picked-up photodetector in amplitude peak ground produces；On the other hand, there is good load-carrying ability.It is a kind of to provide degenerative high-gain high-impedance amplifier, substantially one current-voltage converter by feedback resistance Rf to amplifier in, noise is low, bandwidth and dynamic range big.Present configuration is simple, reasonable in design, use Digital Signal Processing to carry out multiple data process, and control spray pump start-up circuit while utilizing electronic circuit for alarming to report to the police and carry out the startup of spray pump, so as to provide water source to reach the purpose of automatic spray to spray system timely.
Present configuration is simple, and reasonable in design, hardware circuit is small and exquisite, easy to use, and service behaviour is good；Energy-saving and environmental protection, reaction acumen；Point-to-point double-direction radio optic communication is realized, it is ensured that the job stability of circuit between computer；Even if there is voltage drift phenomenon during high voltage output, as long as signal remains in that balance, the cross interference that this circuit causes is the most relatively small；In the case of there is the front stage circuits of easy generation parasitism, in view of this circuit common-mode gain is relatively low, so the probability that it introduces unwanted oscillation to prime is the least.Use Digital Signal Processing to carry out multiple data process, and control spray pump start-up circuit while utilizing electronic circuit for alarming to report to the police and carry out the startup of spray pump, so as to provide water source to reach the purpose of automatic spray to spray system timely.The present invention can remind the escape way distribution situation of scene of fire by electroacoustic alarm, and where is safety area, and reminds scene of fire personnel to carry out orderly withdrawing scene, it is to avoid causes confusion because of panic, causes the accident that should not occur.The present invention carries out the transmission of fire-fighting link by GPRS telecommunication circuit so that fire department, on-the-spot director, periphery neighbours can know timely fire alarm occurs herein such that it is able to provides necessary emergency measure, help measure, control measures and risk avoidance measures；It is provided with the man-machine interface circuit for man-machine interaction, in order to carry out corresponding dialogue between people with machine simultaneously.Digital Signal Processing high-performance of the present invention, the digital signal processing chip of low-power consumption, be internally integrated Various Components, it is possible to quickly, efficiently, accurately to data carries out Treatment Analysis.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (5)
1. an Intelligent preventive control device based on indoor LED visible light communication lifi technology, including
User side, smart mobile phone, Pc computer or panel computer;
Bridgt circuit, is used for connecting user side USB interface and light transmission circuit, accepts or launches the signal carrying out conversion process from computer usb data signal；
Optical sender, carries out coded modulation by the signal processed through usb circuit, and modulated signal sends to modulated light source again after amplifying；
Photoreceiver, sends, transmitting terminal, the light pulse signal come by optical antenna and converges to photoelectric detector
PIN, is converted into telecommunications by the optical signal of reception;
Central processing unit, and the sound intensity testing circuit that is connected with central processing unit and electronic circuit for alarming composition, it is characterised in that: on described electronic circuit for alarming, it is also associated with spray pump start-up circuit.
A kind of intelligent early-warning device based on indoor LED visible light communication lifi technology the most according to claim 1, it is characterised in that: described optical sender includes light source and driver and auxiliary circuit；Described auxiliary circuit includes light detection device, without optical alarm circuit, automatic power control circuit and automatic temp. controlling circuit；During use, the signal of telecommunication is input to driver, and described driver is connected with light source, automatic temp. controlling circuit regulation and control light-source temperature.
A kind of intelligent early-warning device based on indoor LED visible light communication lifi technology the most according to claim 1, it is characterized in that: described optical receiver circuit includes that photodetector, amplifying circuit and signal processing circuit, described signal processing circuit include low noise preamplifier, main amplifier, equalizer, agc circuit；During use, the described digital optical signal through intensity modulated, photoelectric detector uses direct detection mode to receive optical signal at receiving terminal, low noise preamplifier, main amplifier, equalizer constitute the linear passageway of photoreceiver, agc circuit connects between main amplifier and equalizer, complete optical electrical conversion, the signal level needed for optical signal amplification to judgement regenerative circuit.
A kind of intelligent early-warning device based on indoor LED visible light communication lifi technology the most according to claim 1, it is characterised in that: on described central processing unit, it is also associated with man-machine interface circuit.
5. according to a kind of based on indoor LED visible light communication lifi technology the intelligent early-warning device described in any one of claim 1-4, it is characterized in that: described light detection device is arranged in light source range of exposures, and be connected with without optical alarm circuit, described light detection device and an automatic power control circuit constitute feedback circuit with driver after connecting.
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| CN107808476A (en) * | 2017-10-24 | 2018-03-16 | 上海第二工业大学 | The visible ray fire defector network of safe escape path in a kind of prediction building |
| CN107808485A (en) * | 2017-10-24 | 2018-03-16 | 上海第二工业大学 | A kind of method that burning things which may cause a fire disaster is detected using visible light communication |
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| CN1380631A (en) * | 2001-04-06 | 2002-11-20 | 朱正东 | Intelligent fire-pretection system and its control method |
| CN103763030A (en) * | 2014-01-13 | 2014-04-30 | 刘鹏 | Unidirectional transmission device based on LIFI lamplight |
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| CN107808476A (en) * | 2017-10-24 | 2018-03-16 | 上海第二工业大学 | The visible ray fire defector network of safe escape path in a kind of prediction building |
| CN107808485A (en) * | 2017-10-24 | 2018-03-16 | 上海第二工业大学 | A kind of method that burning things which may cause a fire disaster is detected using visible light communication |
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Application publication date: 20161012 |