CN102339517B - Laser communication-based alarm detection method and system - Google Patents
Laser communication-based alarm detection method and system Download PDFInfo
- Publication number
- CN102339517B CN102339517B CN201110158797.4A CN201110158797A CN102339517B CN 102339517 B CN102339517 B CN 102339517B CN 201110158797 A CN201110158797 A CN 201110158797A CN 102339517 B CN102339517 B CN 102339517B
- Authority
- CN
- China
- Prior art keywords
- equipment
- signal
- laser
- light
- receiving end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention discloses a laser communication-based alarm detection method and a laser communication-based alarm detection system. The method comprises the following steps of: adopting a dual-beam detection mode, and arranging two pieces of receiving and transmitting equipment; arranging the two pieces of equipment at two ends of a monitoring area, wherein each piece of equipment comprises a transmitting end and a receiving end, the transmitting end of the first equipment and the receiving end of the second equipment are arranged oppositely, and the transmitting end of the second equipment and the receiving end of the first equipment are arranged oppositely; judging whether a laser signal exists at the receiving end of each piece of equipment or not to monitor the on-off condition of one path of beam by using each piece of equipment; reading and modulating the signal in a light ray to obtain the on-off condition of the other path of beam; and sending the other path of detection beam by using the transmitting end of each piece of equipment, modulating signal intensity information of the receiving end of each piece of equipment into transmitted light, and sending to opposite equipment. By the method and the system, the intensity of the transmitted light can be self-adjusted, the intensity of two paths of light signals is displayed respectively, system failure information can be output, time for blocking laser is accurately calculated, and a false alarm source is effectively shielded.
Description
Technical field
The invention belongs to field of photoelectric technology, relate to a kind of alarm detection method, relate in particular to a kind of alarm detection method based on laser communications; Meanwhile, the invention still further relates to a kind of alarm detection system based on laser communications.
Background technology
Along with social development, some special places need stronger safeguard, to guarantee the safety of national interests and people's lives and properties.The important military installations of the countries concerned's secret for example, the depositing of important classified papers, important core science and technology facility; Again for example, the antitheft security of community, the security works of bank vault etc., all need the security work of efficient anti-invasion formula.Therefore,, along with people are more and more higher to the requirement of security system, be badly in need of a kind of intelligent safety protector of reliable, low rate of false alarm.Can, by non-contacting mode, realize remote invasion formula and report to the police and monitor.
Whether on Vehicles Collected from Market, had multiple laser or infrared emission alarm, its principle is all, by probing light, blocked by object, causes receiving end signal to interrupt, and has determined whether that object passes through detection zone.Trigger alarm system alarm when photoelectric sensor cannot receive light signal.System is generally divided into two parts, and a part is as lasing light emitter, and transmitting is used for the laser of surveying; Another part is receiver, for gathering launched laser, and judges whether laser beam is blocked, if be blocked, takes corresponding measure to report to the police.
But this method has following weak point.First, once detector cannot receive light signal, warning device will trigger alarm, has brought huge challenge so just to the reliability of system.As a kind of safety protection device, the not only reliable detection alarm trigger source that laser avoidance device needs, the generation of Real-Time Monitoring invasion; Wrong report also will shield irrelevant wrong report source, if too much can reduce its reliability equally.Therefore, laser avoidance device need to detect specific trigger source, and sends warning at responsive object during by alarm, and sensitive objects often refers to the Xining of laser here.Suppose, when alarm is used for community security, the detected object of alarm is generally the people of touching light, and at this moment alarm just should shield other irrelevant warnings.For example, the leaf that the raindrop of rainy day whereabouts, a slice fall, the scraps of paper that accidentally fly over all may shut out the light and cause warning.Such warning has just formed wrong report.The harm of wrong report is that very serious, too much wrong report can reduce Security Personnel's alertness, wastes the unnecessary time and processes non-existent invasion.For one of current alarm shortcoming, its deficiency in principle that has its source in, system cannot accurately obtain the time that light is blocked, thereby just cause, cannot to differentiate be any things trigger alarm device.If can obtain temporal information, just can be interval according to the different triggered time of the property settings of different things, thus can shield unwanted warning.For example, leaf is shorter than the light Xining causing in pedestrian, just can shield the trigger pip of short time here.According to this feature, just these wrong reports can be left in the basket like this.
For Infrared intrusion detector, because Infrared intrusion detector adopts infrared LED light source more, light source hot spot is larger.Hot spot diffusion after propagating certain distance, when intrusion object possibly cannot block the hot spot after diffusion completely through out-of-date.Like this, even if intrusion event occurs, receiver still can receive the light signal of leakage, and then cannot report to the police.The reliability of visible Infrared intrusion detector is lower.
In addition, for laser alarm installation, also can run into some problems in practice, because the collimation of laser is fine, still smaller even if laser is propagated the diameter of far its hot spot.Although solved the problem of hot spot diffusion, in the installment and debugging process at laser avoidance device scene, the light that laser instrument need to be sent projects on photoelectric sensor accurately.When distant between transmitter and receiver, for example 100 meters, two points are coincided together accurately by very difficult.Even if debug successfully, also cannot determine whether the center of hot spot is positioned on photoelectric sensor, if depart from center, the light intensity that sensor obtains will decline, and can reduce like this performance of system, and increase the probability of wrong report.What therefore need is to transmit and receive the light intensity signal that device can show that current photoelectric sensor receives, and by regulating emission angle and the acceptance angle of two assemblies the strongest to guarantee the light signal receiving, reaches like this object of accurate debugging.
In practical application, laser avoidance device may be installed in the environment of condition harshness, sometimes must depend on battery and carry out supplying energy, and this just requires system to have certain low-power consumption ability.The light intensity of traditional laser avoidance device transmitting uncontrollable, with constant power emission.Laser instrument is again comparatively catabiotic assembly in system simultaneously, therefore becomes an important step of energy dissipation.Need the laser instrument can be with distance adjustment power, when detecting close together, laser can be used low-power mode, launches low-energy laser; Distant when detecting, can use higher-wattage pattern, launch high-octane laser.
Finally, traditional laser avoidance device does not have recognition capability to some inevitable external disturbance, can be with and serve trouble user.For example, the interference of sunshine to system, when the unreasonable or infield latitude in the receiver installation site of system is higher, a certain moment sunshine in a day may shine directly on the photoelectric sensor of receiver, makes it occur saturated and cannot detect.At this moment traditional alarm will send common intrusion alarm signal.But people wish that alarm is can make judging, and send the signal of system mistake, and the personnel that conveniently maintain change setting angle.
Summary of the invention
Technical matters to be solved by this invention is: a kind of alarm detection method based on laser communications is provided, can realize self-regulation transmitting light intensity, and show respectively two ways of optical signals intensity, can output system failure message, the time that accurate Calculation laser is blocked effective shielding wrong report source.
In addition, the present invention also provides a kind of alarm detection system based on laser communications, can realize self-regulation transmitting light intensity, and show respectively two ways of optical signals intensity, can output system failure message, the time that accurate Calculation laser is blocked effective shielding wrong report source.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
An alarm detection method for laser communications, described method comprises:
Adopt double-beam measurement mode, two reception transmitting apparatus are set: the first equipment, the second equipment; Two equipment are separately positioned on guarded region two ends;
Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of the first equipment and the second equipment is oppositely arranged, and the receiving end of the transmitting terminal of the second equipment and the first equipment is oppositely arranged;
Whether the existence by its receiving end laser signal of judgement of every equipment, monitors the break-make situation of this road light beam; Meanwhile, by reading the break-make situation of another road light beam of signal acquisition being modulated in this light;
Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, the signal strength information of its receiving end is modulated in utilizing emitted light simultaneously, sends to the equipment on opposite.
As a preferred embodiment of the present invention, described transmitting terminal Emission Lasers signal, laser signal is not only used as detecting light, is also the carrier of two equipment transmission of informations;
The laser signal inside of transmitting includes information parameter, realizes the communication between the first equipment, the second equipment.
As a preferred embodiment of the present invention, adopt laser modulation technique, the mode by amplitude-modulating modulation is modulated to numerical information in laser; First by digital signal modulated in the carrier wave of 38KHz, then by modulation after signal add in light signal; Like this, for the light signal of some cycles, while there is the laser of 38KHz 1 of representative digit signal, there is not representative digit signal 0 in 38KHz laser; At receiving end, by photoelectric conversion device, light signal is converted into initial electric signal again, signal is removed 38KHz carrier wave by demodulator circuit and is obtained digital signal, thereby the received device of signal reads the information that transmitting terminal is passed on that obtains;
Laser becomes the carrier of communication, can complete the mutual communication of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal sends 8 information continuously, and each is 1 or 0, then stop sending one section of setting-up time, continue afterwards to send 8 bit data; Like this, the send mode of data is rendered as alternately and sends, and take 8 bit data as one group, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has object invasion, is also the carrier that transmits data; Digital signal is 8 bit data, and the unit interval sends a certain amount of number that obtains, and completes information communication;
Information format is that 8 bit data are one group, and the unit interval sends a certain amount of data group; The data amount check that in utilizing sometime, receiver receives, judges as accurate whether light is blocked, and the standard of blocking time; In setting-up time section, transmitting terminal is fixing sends A group data, if receiving end receives A group data, system works is normal; If the data that receive are B, be less than A group, represent that light has been blocked a period of time; By because the cycle of transmitting data group is known, by calculating the numerical value of A-B, then be multiplied by the transmitting data cycle, obtain the precise time that light is blocked.
As a preferred embodiment of the present invention, when A-B is greater than certain setting threshold, system judgement is invaded, and starts warning LED display board alarm lamp bright, relay output alarm signal.
As a preferred embodiment of the present invention, when meeting accident event, triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm.
As a preferred embodiment of the present invention, in laser, the packets of information of unit interval transmitting some, by measuring packet loss quantity, accurately measures the time length that laser is blocked, and gets rid of interference report by mistake by the shorter warning of shielding Xining;
The laser intelligence of current device transmitting comprises the strength information that this equipment receives light; Every equipment can obtain the strength conditions that opposite equipment receives its emission of light like this, guarantees that the self-adaptation of laser instrument emissive power regulates, and laser power guarantees that by automatically regulating the light intensity of receiving end keeps constant;
First in every equipment, dispose the light intensity parameter of standard, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of the machine Emission Lasers needs the equipment utilization light signal on opposite to send on the receiver of the machine; By reading the feedback information of receiver, just can obtain the light intensity situation of the machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power by increasing the mode of energy of lasers, make corresponding receiving end, obtain better signal; If still cannot reach specified reception when laser instrument is adjusted to maximum, show an outrange warning, display board lamp brightens; While exceeding the light intensity representative value of configuration when the light signal feeding back is excessive, weaken accordingly sharp light intensity, reach and save the object that energy reduces power consumption.
An alarm detection system based on laser communications, described system comprises two reception transmitting apparatus: the first equipment, the second equipment; Two equipment are separately positioned on guarded region two ends;
Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of the first equipment and the second equipment is oppositely arranged, and the receiving end of the transmitting terminal of the second equipment and the first equipment is oppositely arranged;
Whether the existence by its receiving end laser signal of judgement of every equipment, monitors the break-make situation of this road light beam; Meanwhile, by reading the break-make situation of another road light beam of signal acquisition being modulated in this light; Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, the signal strength information of its receiving end is modulated in utilizing emitted light simultaneously, sends to the equipment on opposite.
As a preferred embodiment of the present invention, described transmitting terminal Emission Lasers signal, laser signal is not only used as detecting light, is also the carrier of two equipment transmission of informations;
The laser signal inside of transmitting includes information parameter, realizes the communication between the first equipment, the second equipment.
As a preferred embodiment of the present invention, adopt laser modulation technique, the mode by amplitude-modulating modulation is modulated to numerical information in laser; First by digital signal modulated in the carrier wave of 38KHz, then by modulation after signal add in light signal; Like this, for the light signal of some cycles, while there is the laser of 38KHz 1 of representative digit signal, there is not representative digit signal 0 in 38KHz laser; At receiving end, by photoelectric conversion device, light signal is converted into initial electric signal again, signal is removed 38KHz carrier wave by demodulator circuit and is obtained digital signal, thereby the received device of signal reads the information that transmitting terminal is passed on that obtains;
Laser becomes the carrier of communication, can complete the mutual communication of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal sends 8 information continuously, and each is 1 or 0, then stop sending one section of setting-up time, continue afterwards to send 8 bit data; Like this, the send mode of data is rendered as alternately and sends, and take 8 bit data as one group, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has object invasion, is also the carrier that transmits data; Digital signal is 8 bit data, and the unit interval sends a certain amount of number that obtains, and completes information communication;
Information format is that 8 bit data are one group, and the unit interval sends a certain amount of data group; The data amount check that in utilizing sometime, receiver receives, judges as accurate whether light is blocked, and the standard of blocking time; In setting-up time section, transmitting terminal is fixing sends A group data, if receiving end receives A group data, system works is normal; If the data that receive are B, be less than A group, represent that light has been blocked a period of time; By because the cycle of transmitting data group is known, by calculating the numerical value of A-B, then be multiplied by the transmitting data cycle, obtain the precise time that light is blocked; When A-B is greater than certain setting threshold, system judgement is invaded, and startup warning LED display board warning etc. are bright, relay output alarm signal.
As a preferred embodiment of the present invention, when meeting accident event, triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm;
In laser, the packets of information of unit interval transmitting some, by measuring packet loss quantity, accurately measures the time length that laser is blocked, and gets rid of interference report by mistake by the shorter warning of shielding Xining;
The laser intelligence of current device transmitting comprises the strength information that this equipment receives light; Every equipment can obtain the strength conditions that opposite equipment receives its emission of light like this, guarantees that the self-adaptation of laser instrument emissive power regulates, and laser power guarantees that by automatically regulating the light intensity of receiving end keeps constant;
First in every equipment, dispose the light intensity parameter of standard, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of the machine Emission Lasers needs the equipment utilization light signal on opposite to send on the receiver of the machine; By reading the feedback information of receiver, just can obtain the light intensity situation of the machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power by increasing the mode of energy of lasers, make corresponding receiving end, obtain better signal; If still cannot reach specified reception when laser instrument is adjusted to maximum, show an outrange warning, display board lamp brightens; While exceeding the light intensity representative value of configuration when the light signal feeding back is excessive, weaken accordingly sharp light intensity, reach and save the object that energy reduces power consumption.
Beneficial effect of the present invention is: the alarm detection method and system based on laser communications that the present invention proposes, adopt the technology of the communication of laser amplitude, laser beam completes information transmission and intrusion detection simultaneously, can realize self-regulation transmitting light intensity, and show respectively two ways of optical signals intensity, can output system failure message, the time that accurate Calculation laser is blocked effective shielding wrong report source.
Accompanying drawing explanation
Fig. 1-1, Fig. 1-2 are laser avoidance device schematic views.
Fig. 2 is the LED display board schematic diagram of alarm detection system of the present invention.
Fig. 3 is alarm detection system alarm inner structure signal of the present invention.
Fig. 4 is laser avoidance device system chart.
Fig. 5 is A, two machine data communication sequence figure of B.
Fig. 6 is communication information content and mode schematic diagram.
Fig. 7 is for to be modulated to the driving circuit in laser by Serial Port Information.
Fig. 8 is the ADC sample circuit of silicon photocell.
Fig. 9 is system data communication schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, describe the preferred embodiments of the present invention in detail.
Embodiment mono-
The present invention has disclosed a kind of alarm detection method based on laser communications, and described method comprises: adopt double-beam measurement mode, two reception transmitting apparatus are set: the first equipment, the second equipment; Two equipment are separately positioned on guarded region two ends; Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of the first equipment and the second equipment is oppositely arranged, and the receiving end of the transmitting terminal of the second equipment and the first equipment is oppositely arranged; Whether the existence by its receiving end laser signal of judgement of every equipment, monitors the break-make situation of this road light beam; Meanwhile, by reading the break-make situation of another road light beam of signal acquisition being modulated in this light; Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, the signal strength information of its receiving end is modulated in utilizing emitted light simultaneously, sends to the equipment on opposite.
Described transmitting terminal Emission Lasers signal, laser signal is not only used as detecting light, is also the carrier of two equipment transmission of informations; The laser signal inside of transmitting includes information parameter, realizes the communication between the first equipment, the second equipment.
The present invention adopts laser modulation technique, and the mode by amplitude-modulating modulation is modulated to numerical information in laser; First by digital signal modulated in the carrier wave of 38KHz, then by modulation after signal add in light signal; Like this, for the light signal of some cycles, while there is the laser of 38KHz 1 of representative digit signal, there is not representative digit signal 0 in 38KHz laser; At receiving end, by photoelectric conversion device, light signal is converted into initial electric signal again, signal is removed 38KHz carrier wave by demodulator circuit and is obtained digital signal, thereby the received device of signal reads the information that transmitting terminal is passed on that obtains.
Laser becomes the carrier of communication, can complete the mutual communication of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal sends 8 information continuously, and each is 1 or 0, then stop sending one section of setting-up time, continue afterwards to send 8 bit data; Like this, the send mode of data is rendered as alternately and sends, and take 8 bit data as one group, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has object invasion, is also the carrier that transmits data; Digital signal is 8 bit data, and the unit interval sends a certain amount of number that obtains, and completes information communication.
Information format is that 8 bit data are one group, and the unit interval sends a certain amount of data group; The data amount check that in utilizing sometime, receiver receives, judges as accurate whether light is blocked, and the standard of blocking time; In setting-up time section, transmitting terminal is fixing sends A group data, if receiving end receives A group data, system works is normal; If the data that receive are B, be less than A group, represent that light has been blocked a period of time; By because the cycle of transmitting data group is known, by calculating the numerical value of A-B, then be multiplied by the transmitting data cycle, obtain the precise time that light is blocked.When A-B is greater than certain setting threshold, system judgement is invaded, and starts warning LED display board alarm lamp bright, relay output alarm signal; When meeting accident event, triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm.
In laser, the packets of information of unit interval transmitting some, by measuring packet loss quantity, accurately measures the time length that laser is blocked, and gets rid of interference report by mistake by the shorter warning of shielding Xining.
The laser intelligence of current device transmitting comprises the strength information that this equipment receives light; Every equipment can obtain the strength conditions that opposite equipment receives its emission of light like this, guarantees that the self-adaptation of laser instrument emissive power regulates, and laser power guarantees that by automatically regulating the light intensity of receiving end keeps constant.
First in every equipment, dispose the light intensity parameter of standard, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of the machine Emission Lasers needs the equipment utilization light signal on opposite to send on the receiver of the machine; By reading the feedback information of receiver, just can obtain the light intensity situation of the machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power by increasing the mode of energy of lasers, make corresponding receiving end, obtain better signal; If still cannot reach specified reception when laser instrument is adjusted to maximum, show an outrange warning, display board lamp brightens; While exceeding the light intensity representative value of configuration when the light signal feeding back is excessive, weaken accordingly sharp light intensity, reach and save the object that energy reduces power consumption.
More than disclosed alarm detection method of the present invention, the present invention, when disclosing said method, also discloses a kind of alarm detection system based on laser communications, and described system comprises two reception transmitting apparatus: the first equipment, the second equipment; Two equipment are separately positioned on guarded region two ends.Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of the first equipment and the second equipment is oppositely arranged, and the receiving end of the transmitting terminal of the second equipment and the first equipment is oppositely arranged.Whether the existence by its receiving end laser signal of judgement of every equipment, monitors the break-make situation of this road light beam; Meanwhile, by reading the break-make situation of another road light beam of signal acquisition being modulated in this light; Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, the signal strength information of its receiving end is modulated in utilizing emitted light simultaneously, sends to the equipment on opposite.
Described transmitting terminal Emission Lasers signal, laser signal is not only used as detecting light, is also the carrier of two equipment transmission of informations; The laser signal inside of transmitting includes information parameter, realizes the communication between the first equipment, the second equipment.
Adopt laser modulation technique, the mode by amplitude-modulating modulation is modulated to numerical information in laser; First by digital signal modulated in the carrier wave of 38KHz, then by modulation after signal add in light signal; Like this, for the light signal of some cycles, while there is the laser of 38KHz 1 of representative digit signal, there is not representative digit signal 0 in 38KHz laser; At receiving end, by photoelectric conversion device, light signal is converted into initial electric signal again, signal is removed 38KHz carrier wave by demodulator circuit and is obtained digital signal, thereby the received device of signal reads the information that transmitting terminal is passed on that obtains.
Laser becomes the carrier of communication, can complete the mutual communication of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal sends 8 information continuously, and each is 1 or 0, then stop sending one section of setting-up time, continue afterwards to send 8 bit data; Like this, the send mode of data is rendered as alternately and sends, and take 8 bit data as one group, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has object invasion, is also the carrier that transmits data; Digital signal is 8 bit data, and the unit interval sends a certain amount of number that obtains, and completes information communication.
Information format is that 8 bit data are one group, and the unit interval sends a certain amount of data group; The data amount check that in utilizing sometime, receiver receives, judges as accurate whether light is blocked, and the standard of blocking time; In setting-up time section, transmitting terminal is fixing sends A group data, if receiving end receives A group data, system works is normal; If the data that receive are B, be less than A group, represent that light has been blocked a period of time; By because the cycle of transmitting data group is known, by calculating the numerical value of A-B, then be multiplied by the transmitting data cycle, obtain the precise time that light is blocked; When A-B is greater than certain setting threshold, system judgement is invaded, and startup warning LED display board warning etc. are bright, relay output alarm signal.
When meeting accident event, triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm; In laser, the packets of information of unit interval transmitting some, by measuring packet loss quantity, accurately measures the time length that laser is blocked, and gets rid of interference report by mistake by the shorter warning of shielding Xining; The laser intelligence of current device transmitting comprises the strength information that this equipment receives light; Every equipment can obtain the strength conditions that opposite equipment receives its emission of light like this, guarantees that the self-adaptation of laser instrument emissive power regulates, and laser power guarantees that by automatically regulating the light intensity of receiving end keeps constant.
First in every equipment, dispose the light intensity parameter of standard, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of the machine Emission Lasers needs the equipment utilization light signal on opposite to send on the receiver of the machine; By reading the feedback information of receiver, just can obtain the light intensity situation of the machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power by increasing the mode of energy of lasers, make corresponding receiving end, obtain better signal; If still cannot reach specified reception when laser instrument is adjusted to maximum, show an outrange warning, display board lamp brightens; While exceeding the light intensity representative value of configuration when the light signal feeding back is excessive, weaken accordingly sharp light intensity, reach and save the object that energy reduces power consumption.
Embodiment bis-
1, two mutual communications of machine:
In design, adopted the technology of Laser Modulation, by the mode of amplitude-modulating modulation, information has been added in laser.System has two pairs of configuration of instruments, instrument is not all had to the function of transmitting and receiving, and transmits and receives respectively to intersect and be arranged in two paths of signals, as shown in Figure 3.The laser of a machine is by transmitter, by information transmitting in the receiving trap of machine on the other side.Machine on the other side receives laser, and the signal of monitoring in laser obtains the data such as break-make, emissive power, configuration information of laser by judgement.Then the machine on opposite is sending to the data of oneself in this machine by identical mode.
In Fig. 3, a machine is provided with laser avoidance device A 31, first via transmitter 32, No. second receiver 34; First via transmitter 32 transmitting terminals are provided with level crossing anti-reflection film 33, No. the second receivers 34 and comprise silicon photocell 35, convex lens 36, and convex lens 36 are for converging.Another machine is provided with first via receiver 37, laser avoidance device B 38, No. second transmitter 39.
In laser amplitude, the present invention has adopted and has utilized the mode of on-off circuit driving laser diode to realize, first design a kind of oscillatory circuit, can export the switching signal of certain frequency, and utilize this signal driver laser diode that opens the light, make it to send the blinking light of corresponding frequencies, this signal is used as carrier wave.Answer in contrast, at receiving end, adopt silicon photocell to receive laser signal, and be translated into electric signal, then by bandpass filter, shield the interference of other wave band, finally obtain the light pulse signal of this frequency.
Next, the present invention just can add signal in carrier wave to and go, and selects the serial signal of 112500 baud rates, and by the Enable Pin of this signal input 38KHz oscillatory circuit.When serial signal is that high level is, laser instrument is exported continuous 38KHz light signal, otherwise serial signal is zero, there is no light signal output.Whether like this, at receiving end, by detecting the light signal of 38KHz, exist, the serial information that just can read transmitting comes.
The technology adopting in the present invention is, Emission Lasers is carried out to AM modulation with the signal of serial ports output, and therefore, laser is not only light intensity, break-make whether carrier, is also the carrier of signal.Photoelectric detector obtains is not only whether break-make of light path, also has the information of opposite machine transmission.In the present invention, adopting baud rate is that the information format of 112500 serial ports is carried out communication, and namely light signal has carrier signal and rs 232 serial interface signal to be formed by stacking.First the information light signal that utilizes serial ports to send, when Serial Port Information is zero, does not have light to send, when serial ports is for having the 38KHz light after modulation to send for the moment.As shown in Figure 4, adopt MAX4515 analog switch chip, utilize rs 232 serial interface signal input gating control end, not conducting of chip when signal is zero, operational amplifier is output not, and field effect transistor is in high-impedance state, and laser tube is not worked; When signal is chip conducting for the moment, field effect transistor conducting, laser tube work.When light signal spreads out of receiving end, receiving end utilizes photoelectric sensor to become electric signal the light signal of modulation, by ADC sample circuit, processes as shown in Figure 7, just can obtain the rs 232 serial interface signal after reduction and be identified by single-chip microcomputer C8051F040.
The method that intrusion detection of the present invention adopts is, the unit interval is fixing sends a certain amount of data, and receiving end receives data and also detects its validity, and the quantity that receives valid data by judging in this short time just can judge whether that light signal is blocked.If detecting that data are less than must threshold value, system is just sent alerting signal.Data can also be as the carrier of communication simultaneously.
The data that light signal sends are not only for calculating Xining, and also for recording current the machine receiving end intensity signal, and whether two paths of signals needs to report to the police.The form of information is as follows:
First of information: start bit machine A sends 0xAA, and machine B sends 0xBB;
Information second: intensity signal 0xFF represents that the strongest 0x00 is for the most weak;
The 3rd of information: whether current this road signal is good is to be 0x02 for 0x01 is no;
The 4th of information: whether laser intensity needs to regulate, and need to raise 0x01, need to lower 0x02, without regulating 0x03;
The 5th of information: stop bit is unified is 0x55.
The transmission that circulates in information link of these five data, when reading out data is 0xAA, starts to process, and to 0x55, finishes.
By receiver, process, can control the LED viewing area demonstration of machine side surface, A1～A4 is first via signal intensity, and B1～B4 is the second tunnel signal intensity, and C1 is that system outrange is reported to the police, and C2 is the saturated warning of system, and C3 is system Normal Alarm.When system Normal Alarm, the relay work of machine, outputs level signals, drives warning device work, visible Fig. 2.
2, accurately measure laser Xining and reduce rate of false alarm:
As described above, by the number of the unit of account information that in the time, receiving end is received, and this quantity is contrasted with standard number, just can learn whether light is blocked and Xining.
Light signal is the carrier of serial data, the serial data data that can transmit continuously at most 1440 8 data bit per second of 11520 baud rates, as shown in Figure 9.In Fig. 9,91 is laser avoidance device A, and 92 is first via transmitting and receiving signal, and 93,94 is base, and 95 is display board, and 96 is laser avoidance device B.
In the present invention, adopted the communication mode sending for 500 times per second, as shown in Figure 6, first A machine is started working and is sent the wait of data B machine, after A machine is sent completely, also enters wait.When B machine, receive after data, process judgement, then to A machine, sending data, once circulation.And system can detect the quantity of the data that A, B two machines receive at interval of certain hour, if there is object to there will be the loss of data through this, the quantity of losing by computational data, just can obtain the concrete time that laser is blocked accordingly.Here adopted two-way crossover for the mode sending, guaranteed that do not work in another road when a certain road light is worked, can avoid crosstalking of two paths of signals like this, avoided Liao Yin mono-road signal to be irradiated in another road signal and may cause aliasing mistake.
The present invention has adopted and has sent for 500 times per second, because A, B two machines hocket, and actual every machine transmission per second 250 times, therefore, the minimum resolution of Xining is 6.4 milliseconds.By distinguishing the Xining characteristic of different things, just can shield some interfering external cause wrong reports.For example pedestrian mostly is 0.2～0.5 second by the time of laser alarm installation, by limit this characteristic just can shield other for example leaf fall, the warning that raindrop etc. cause, and their Xining is generally at 0.1 second once.
3, show that the intensity signal receiving is used for Installation and Debugging:
The concrete grammar of realizing two machine communications is, two modules respectively comprise a transmitter and a receiver, and as shown in Figure 5, the first via signal of A machine is for transmitting the second road signal is for receiving, and the first via signal of contrary B machine is just for receiving the second road signal for transmitting.Meanwhile, transmitter is at the Emission Lasers that is single firm power, but launches the amplitude modulation digital optical signal with information content of modulated mistake.An a certain like this machine, just can send to the situation of the machine by light signal the machine on opposite, and the machine on opposite is analyzed the information comprising in laser, then in conjunction with the measurement to the light intensity of laser own, just can obtain the light intensity of two paths of signals.As shown in Figure 6, A machinery utilization the machine receiver is by detecting the laser of B machine transmitting, judges whether laser exists and light intensity magnitude can obtain the situation of the second road signal; Then A machine by the situation on the second tunnel by its transmitter, the first via laser of take is transmitted to B machine as carrier.B machine has received the laser of A machine, also, by judgement laser size and having or not, obtains the situation of first via signal, then analyzes and take the information that first via laser is carrier, can obtain the situation on the second tunnel.Every machine can obtain the data of two-way detection simultaneously like this.
As shown in Figure 6, visible A, two machines of B can obtain the break-make situation of two paths of signals simultaneously, and intensity signal, the signal acquisition superposeing in the machine processing laser of one of them signal, during another signal, the machine analysis laser intensity obtains.
As shown in Fig. 1-1, Fig. 1-2, Fig. 2, every machine side surface has one group of LED module for showing, has represented respectively the light intensity of two paths of signals, by observing, can clearly obtain the strength information of two paths of signals.Like this by the intensity of judgement two paths of signals, when normal operation, just can infer whether two paths of signals is blocked, when adjustment and installation, just can be used for checking laser whether to be radiated at accurately on photoelectric sensor, by regulating mechanical parts, when the light intensity that shows as LED is maximum for to regulate successfully.So just alleviated to a certain extent the problem of laser avoidance device adjustment and installation difficulty.
4, the self-adaptation of transmitting light intensity regulates:
First in every machine, dispose the light intensity parameter of standard, because transmitter and its corresponding receiving end be not on a machine, so the reception condition of the machine Emission Lasers needs the machinery utilization light signal on opposite to send on the receiver of the machine.By reading the feedback information of receiver, just can obtain the light intensity situation of the machine transmitter institute respective optical path.When light intensity is not enough, can promote luminous power by increasing the mode of energy of lasers, make corresponding receiving end, obtain better signal.If still cannot reach specified reception when laser instrument is adjusted to maximum, show an outrange warning, display board C1 lamp brightens, as shown in Figure 2.While exceeding the light intensity representative value of configuration when excessive with the light signal that should feed back, can weaken accordingly sharp light intensity, reach and save the object that energy reduces power consumption.The present invention has just realized the function of self-adaptation adjusting laser intensity like this.
5, the system failure is reported to the police:
The present invention uses silicon photocell as photoelectric sensor, for receiving laser, so just can obtain the volume unit of laser, and as shown in Figure 4, photoelectricity gathers after light intensity signal Hou， mono-road signal amplifies by shaping filter and inputs serial ports; Sample by the ADC of external trigger in another road, the output voltage amplitude that obtains sensor is intensity signal.Because laser adopts the information format of amplitude modulation, light intensity is for being interrupted output, whenever light signal occur by zero to one during saltus step, be converted into and produce a rising edge equally after electric signal, using it as a trigger pip.Whenever rising edge being detected, just trigger ADC sampling for several times, and the intensity size using sampling average as current demand signal.
In sum, the alarm detection method and system based on laser communications that the present invention proposes, adopt the technology of the communication of laser amplitude, laser beam completes information transmission and intrusion detection simultaneously, can realize self-regulation transmitting light intensity, and show respectively two ways of optical signals intensity, can output system failure message, the time that accurate Calculation laser is blocked effective shielding wrong report source.
Here description of the invention and application is illustrative, not wants by scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and for those those of ordinary skill in the art, the various parts of the replacement of embodiment and equivalence are known.Those skilled in the art are noted that in the situation that not departing from spirit of the present invention or essential characteristic, and the present invention can be with other form, structure, layout, ratio, and realizes with other assembly, material and parts.In the situation that not departing from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (8)
1. the alarm detection method based on laser communications, is characterized in that, described method comprises:
Adopt double-beam measurement mode, two reception transmitting apparatus are set: the first equipment, the second equipment; Two equipment are separately positioned on guarded region two ends;
Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of the first equipment and the second equipment is oppositely arranged, and the receiving end of the transmitting terminal of the second equipment and the first equipment is oppositely arranged;
Whether the existence by its receiving end laser signal of judgement of every equipment, monitors the break-make situation of this road light beam; Meanwhile, by reading the break-make situation of another road light beam of signal acquisition being modulated in this light;
Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, the signal strength information of its receiving end is modulated in utilizing emitted light simultaneously, sends to the equipment on opposite;
Adopt laser modulation technique, the mode by amplitude-modulating modulation is modulated to numerical information in laser; First by digital signal modulated in the carrier wave of 38KHz, then by modulation after signal add in light signal; Like this, for the light signal of some cycles, while there is the laser of 38KHz 1 of representative digit signal, there is not representative digit signal 0 in 38KHz laser; At receiving end, by photoelectric conversion device, light signal is converted into initial electric signal again, signal is removed 38KHz carrier wave by demodulator circuit and is obtained digital signal, thereby the received device of signal reads the information that transmitting terminal is passed on that obtains;
Laser becomes the carrier of communication, can complete the mutual communication of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal sends 8 information continuously, and each is 1 or 0, then stop sending one section of setting-up time, continue afterwards to send 8 bit data; Like this, the send mode of data is rendered as alternately and sends, and take 8 bit data as one group, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has object invasion, is also the carrier that transmits data; Digital signal is 8 bit data, and the unit interval sends a certain amount of number, completes information communication;
Information format is that 8 bit data are one group, and the unit interval sends a certain amount of data group; The data amount check that in utilizing sometime, receiver receives, judges as accurate whether light is blocked, and the standard of blocking time; In setting-up time section, transmitting terminal is fixing sends A group data, if receiving end receives A group data, system works is normal; If the data that receive are B, be less than A group, represent that light has been blocked a period of time; Because the cycle of transmitting data group is known, by calculating the numerical value of A-B, then be multiplied by the transmitting data cycle, obtain the precise time that light is blocked.
2. the alarm detection method based on laser communications according to claim 1, is characterized in that:
Described transmitting terminal Emission Lasers signal, laser signal is not only used as detecting light, is also the carrier of two equipment transmission of informations;
The laser signal inside of transmitting includes information parameter, realizes the communication between the first equipment, the second equipment.
3. the alarm detection method based on laser communications according to claim 1, is characterized in that:
When A-B is greater than certain setting threshold, system judgement is invaded, and starts warning LED display board alarm lamp bright, relay output alarm signal.
4. the alarm detection method based on laser communications according to claim 1, is characterized in that:
When meeting accident event, triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm.
5. the alarm detection method based on laser communications according to claim 1, is characterized in that:
In laser, the packets of information of unit interval transmitting some, by measuring packet loss quantity, accurately measures the time length that laser is blocked, and gets rid of interference report by mistake by the shorter warning of shielding Xining;
The laser intelligence of current device transmitting comprises the strength information that this equipment receives light; Every equipment can both obtain the strength conditions that opposite equipment receives its emission of light like this, guarantees that the self-adaptation of laser instrument emissive power regulates, and laser power guarantees that by automatically regulating the light intensity of receiving end keeps constant;
First in every equipment, dispose the light intensity parameter of standard, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of the machine Emission Lasers needs the equipment utilization light signal on opposite to send on the receiver of the machine; By reading the feedback information of receiver, just can obtain the light intensity situation of the machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power by increasing the mode of energy of lasers, make corresponding receiving end, obtain better signal; If still cannot reach specified reception when laser instrument is adjusted to maximum, show an outrange warning, display board lamp brightens; While exceeding the light intensity representative value of configuration when the light signal feeding back is excessive, weaken accordingly sharp light intensity.
6. the alarm detection system based on laser communications, is characterized in that, described system comprises two reception transmitting apparatus: the first equipment, the second equipment; Two equipment are separately positioned on guarded region two ends;
Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of the first equipment and the second equipment is oppositely arranged, and the receiving end of the transmitting terminal of the second equipment and the first equipment is oppositely arranged;
Whether the existence by its receiving end laser signal of judgement of every equipment, monitors the break-make situation of this road light beam; Meanwhile, by reading the break-make situation of another road light beam of signal acquisition being modulated in this light; Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, the signal strength information of its receiving end is modulated in utilizing emitted light simultaneously, sends to the equipment on opposite;
Adopt laser modulation technique, the mode by amplitude-modulating modulation is modulated to numerical information in laser; First by digital signal modulated in the carrier wave of 38KHz, then by modulation after signal add in light signal; Like this, for the light signal of some cycles, while there is the laser of 38KHz 1 of representative digit signal, there is not representative digit signal 0 in 38KHz laser; At receiving end, by photoelectric conversion device, light signal is converted into initial electric signal again, signal is removed 38KHz carrier wave by demodulator circuit and is obtained digital signal, thereby the received device of signal reads the information that transmitting terminal is passed on that obtains;
Laser becomes the carrier of communication, can complete the mutual communication of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal sends 8 information continuously, and each is 1 or 0, then stop sending one section of setting-up time, continue afterwards to send 8 bit data; Like this, the send mode of data is rendered as alternately and sends, and take 8 bit data as one group, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has object invasion, is also the carrier that transmits data; Digital signal is 8 bit data, and the unit interval sends a certain amount of number, completes information communication;
Information format is that 8 bit data are one group, and the unit interval sends a certain amount of data group; The data amount check that in utilizing sometime, receiver receives, judges as accurate whether light is blocked, and the standard of blocking time; In setting-up time section, transmitting terminal is fixing sends A group data, if receiving end receives A group data, system works is normal; If the data that receive are B, be less than A group, represent that light has been blocked a period of time; Because the cycle of transmitting data group is known, by calculating the numerical value of A-B, then be multiplied by the transmitting data cycle, obtain the precise time that light is blocked; When A-B is greater than certain setting threshold, system judgement is invaded, and starts warning LED display board alarm lamp bright, relay output alarm signal.
7. the alarm detection system based on laser communications according to claim 6, is characterized in that:
Described transmitting terminal Emission Lasers signal, laser signal is not only used as detecting light, is also the carrier of two equipment transmission of informations;
The laser signal inside of transmitting includes information parameter, realizes the communication between the first equipment, the second equipment.
8. the alarm detection system based on laser communications according to claim 6, is characterized in that:
When meeting accident event, triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm;
In laser, the packets of information of unit interval transmitting some, by measuring packet loss quantity, accurately measures the time length that laser is blocked, and gets rid of interference report by mistake by the shorter warning of shielding Xining;
The laser intelligence of current device transmitting comprises the strength information that this equipment receives light; Every equipment can both obtain the strength conditions that opposite equipment receives its emission of light like this, guarantees that the self-adaptation of laser instrument emissive power regulates, and laser power guarantees that by automatically regulating the light intensity of receiving end keeps constant;
First in every equipment, dispose the light intensity parameter of standard, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of the machine Emission Lasers needs the equipment utilization light signal on opposite to send on the receiver of the machine; By reading the feedback information of receiver, just can obtain the light intensity situation of the machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power by increasing the mode of energy of lasers, make corresponding receiving end, obtain better signal; If still cannot reach specified reception when laser instrument is adjusted to maximum, show an outrange warning, display board lamp brightens; While exceeding the light intensity representative value of configuration when the light signal feeding back is excessive, weaken accordingly sharp light intensity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110158797.4A CN102339517B (en) | 2011-06-14 | 2011-06-14 | Laser communication-based alarm detection method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110158797.4A CN102339517B (en) | 2011-06-14 | 2011-06-14 | Laser communication-based alarm detection method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102339517A CN102339517A (en) | 2012-02-01 |
| CN102339517B true CN102339517B (en) | 2014-02-05 |
Family
ID=45515223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110158797.4A Expired - Fee Related CN102339517B (en) | 2011-06-14 | 2011-06-14 | Laser communication-based alarm detection method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102339517B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107533796A (en) * | 2014-12-16 | 2018-01-02 | 任哲洙 | Pedestrian's security system of crossing |
| CN106289360B (en) * | 2015-05-19 | 2019-10-22 | 科沃斯机器人股份有限公司 | The detection method of sensor reliability and its certainly mobile processing unit and system |
| CN106289361B (en) * | 2015-05-19 | 2019-10-22 | 科沃斯机器人股份有限公司 | The detection method of sensor reliability and its certainly mobile processing unit and system |
| CN106920353B (en) * | 2015-12-25 | 2019-06-04 | 江苏海盟金网信息技术有限公司 | A kind of method for detecting position based on foreign body intrusion security device |
| CN106919122A (en) * | 2015-12-25 | 2017-07-04 | 江苏海盟金网信息技术有限公司 | A kind of foreign body intrusion security and warning system |
| CN106919124A (en) * | 2015-12-25 | 2017-07-04 | 江苏海盟金网信息技术有限公司 | A kind of foreign body intrusion security device |
| CN107424391A (en) * | 2017-05-31 | 2017-12-01 | 贵州乌江水电开发有限责任公司 | A kind of hydroelectric power plant's intelligent alarm system |
| CN108182777B (en) * | 2017-12-29 | 2020-03-03 | 北京奇虎科技有限公司 | Alarm method, device and system based on laser correlation technology |
| CN111077584B (en) * | 2018-10-19 | 2022-04-08 | 北京天乐泰力科技发展有限公司 | Filtering processing method for laser correlation device |
| CN109637064B (en) * | 2019-01-29 | 2021-06-11 | 深圳市汉明电子有限公司 | Object deformation early warning monitoring system and method |
| CN111243210B (en) * | 2020-01-15 | 2021-08-03 | 南宁学院 | Financial area monitoring system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6259365B1 (en) * | 2000-02-17 | 2001-07-10 | James Hagar | Laser security fence apparatus |
| CN2758758Y (en) * | 2004-12-20 | 2006-02-15 | 张武新 | Mutual transmission type laser anti-theft detector |
| CN201616828U (en) * | 2009-12-04 | 2010-10-27 | 山东大学 | Self-adaptive laser tracking adjusting system |
-
2011
- 2011-06-14 CN CN201110158797.4A patent/CN102339517B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6259365B1 (en) * | 2000-02-17 | 2001-07-10 | James Hagar | Laser security fence apparatus |
| CN2758758Y (en) * | 2004-12-20 | 2006-02-15 | 张武新 | Mutual transmission type laser anti-theft detector |
| CN201616828U (en) * | 2009-12-04 | 2010-10-27 | 山东大学 | Self-adaptive laser tracking adjusting system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102339517A (en) | 2012-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102339517B (en) | Laser communication-based alarm detection method and system | |
| CN102708647B (en) | Image and multi-band infrared-ultraviolet compound fire disaster detection system and method | |
| CN104008621B (en) | Defence area type optical fiber disturbance perimeter security system and invasion disturbance method for rapidly judging | |
| CN106652285A (en) | Distributed multi-defence-area vibration optical fiber perimeter alarm system and perimeter monitoring method | |
| CN106292582A (en) | A kind of controller switching equipment intelligent diagnostics based on Internet of Things and delivery system | |
| CN105046860A (en) | Intrusion detection system and method using Doppler effect of light waves | |
| CN201796151U (en) | Active infrared detection device | |
| CN105376531A (en) | Intelligent security and protection system based on IOT (Internet of Things) | |
| CN109191759A (en) | A kind of intelligence beam type gas characteristic spectrum fire detector | |
| CN203350975U (en) | Optical fiber intelligent security sensor system | |
| CN102928740B (en) | Intelligent collection type fault diagnosis and In-Line Temperature Measure System | |
| CN208706034U (en) | A kind of screen of trees alarm system | |
| CN202662124U (en) | Image and multi-waveband infrared-ultraviolet combined type fire detecting system | |
| CN206292933U (en) | Distributed many defence area vibration optical fiber perimeter alarm systems | |
| CN105261158A (en) | High-precision natural gas leakage detector based on Internet of things | |
| CN110430645A (en) | Lamp light control system and its smart home system | |
| CN107331095A (en) | A kind of utilization target movement produces the intrusion detection method of light variable | |
| CN201867911U (en) | GPRS (General Packet Radio Service) transmission type vibration sensing optic cable alarm system | |
| CN205264012U (en) | High accuracy natural gas leakage detector based on thing networking | |
| CN208922434U (en) | A kind of intelligence beam type gas characteristic spectrum fire detector | |
| CN203812352U (en) | Long distance optical fiber circumference invasion alarming system | |
| CN204331063U (en) | Needle detetor | |
| CN203325130U (en) | Orchard theft prevention alarm system based on ZigBee | |
| CN207248360U (en) | A kind of outdoor ECOLOGICAL ENVIRONMENTAL MONITORING collector based on signal processing circuit | |
| CN204315009U (en) | A kind of prison separation net intrusion detection device based on nine axis movement sensors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140205 Termination date: 20160614 |