CN102339517A - Laser communication-based alarm detection method and system - Google Patents
Laser communication-based alarm detection method and system Download PDFInfo
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- CN102339517A CN102339517A CN2011101587974A CN201110158797A CN102339517A CN 102339517 A CN102339517 A CN 102339517A CN 2011101587974 A CN2011101587974 A CN 2011101587974A CN 201110158797 A CN201110158797 A CN 201110158797A CN 102339517 A CN102339517 A CN 102339517A
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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; Simultaneously, the invention still further relates to a kind of alarm detection system based on laser communications.
Background technology
Along with the development of society, the required stronger safeguard in field that some are special is to guarantee the safety of national interests and people's lives and properties.The important military installations of the countries concerned secrets for example, important classified papers deposit important core science and technology facility; Again for example, the antitheft security of sub-district, the security works of bank vault etc. all need the security work of anti-invasion formula efficiently.Therefore, Along with people's to the security system require increasingly high, be badly in need of a kind of reliably, the intelligent safety protector of low rate of false alarm.Can realize that remote invasion formula is reported to the police and monitoring through non-contacting mode.
Had multiple laser or infrared correlation alarm on the current market, whether its principle is all, blocked by object through probing light, causes receiving end signal to interrupt, and has determined whether that object passes through detection zone.When photoelectric sensor can't receive light signal, then triggering warning system reports to the police.System generally is divided into two parts, and a part is launched the laser that is used to survey as lasing light emitter; Another part is a receiver, is used to gather institute's emitted laser, and judges whether laser beam is blocked, if be blocked then take corresponding measure to report to the police.
But this method has following weak point.At first, in case detector can't receive light signal, warning device will trigger warning, has brought great challenge with regard to the reliability of giving system like this.As a kind of safety protection device, the not only reliable detection warning triggering source that laser avoidance device needs, the generation of monitoring invasion in real time; Wrong report also will shield irrelevant wrong report source, if too much can reduce its reliability equally.Therefore, laser avoidance device need detect specific triggering source, and sends warning at the object of sensitivity during through alarm, and sensitive objects often refers to the blocking-up time of laser here.Suppose that when alarm was used for the sub-district security, the detected object of alarm generally was the people of touching light, at this moment alarm just should shield other irrelevant warnings.For example, the leaf of the raindrop of rainy day whereabouts, a slice whereabouts, the accidental scraps of paper that fly over all possibly shut out the light and cause warning.Such warning has just formed wrong report.The harm of wrong report is very serious, and too much wrong report can reduce Security Personnel's alertness, wastes the unnecessary time and handles non-existent invasion.For one of current alarm shortcoming, the deficiency on its principle that has its source in, system can't accurately obtain the time that light is blocked, can't to differentiate be that what things triggers alarm thereby just cause.If can obtain temporal information, just can be according to the property settings of the different things different triggered times is interval, thereby can shield unwanted warning.For example, leaf is shorter than the light blocking-up time ratio that causes in the pedestrian, just can shield the trigger pip of short time here.According to these characteristics, just can be left in the basket these wrong reports like this.
For IR intrusion detector, because IR intrusion detector adopts the infrared LED light source more, the light source hot spot is bigger.Hot spot diffusion after propagating certain distance is when the hot spot of intrusion object after out-of-date possibly can't be blocked diffusion fully.Like this, even intrusion event takes place, receiver still can receive the light signal of leakage, and then can't report to the police.It is thus clear that the reliability of IR intrusion detector is lower.
In addition, in reality, also can run into some problems for laser alarm installation, because it is the collimation of laser is fine, still smaller even laser is propagated the diameter of far its hot spot.Though solved the problem of hot spot diffusion, in the installation and debug process at laser avoidance device scene, need project the light that laser instrument sends on the photoelectric sensor accurately.When the distance between transmitter and the receiver is far away, for example 100 meters, two points are coincided together the ten minutes difficulty accurately.Even debug successfully, can't confirm also whether the center of hot spot is positioned on the photoelectric sensor, if off-center, the light intensity that sensor obtains will descend, and can reduce the performance of system like this, 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, the strongest to guarantee the light signal that receives through emission angle and the acceptance angle of regulating two assemblies, reaches the purpose of accurate debugging like this.
In the practical application, laser avoidance device may be installed in the condition rigorous environment, must depend on battery sometimes and come supplying energy, and this just requires system to have certain low-power consumption ability.The light intensity of traditional laser avoidance device emission uncontrollable is with constant power emission.Laser instrument is again a comparatively catabiotic assembly in the 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 use low-power mode, launches low-energy laser; When detecting distance far be, can use the higher-wattage pattern, launch high-octane laser.
At last, traditional laser avoidance device does not have recognition capability to some inevitable external disturbance, can bring some troubles to the user.For example, sunshine is to the interference of system, and when the unreasonable or infield latitude in the receiver installation site of system was higher, a certain moment sunshine in a day possibly shine directly on the photoelectric sensor of receiver, makes it take place saturated and can't detect.At this moment traditional alarm will send common intrusion alarm signal.But people hope 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 emission light intensity; And show two ways of optical signals intensity respectively, can output system failure message, the time that accurate Calculation laser is blocked and 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 emission light intensity, and show two ways of optical signals intensity respectively, can output system failure message, the time that accurate Calculation laser is blocked and effective shielding wrong report source.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of alarm detection method based on laser communications, said method comprises:
Adopt the twin-beam detection mode, two reception transmitting apparatus are set: first equipment, second equipment; Two equipment are separately positioned on the guarded region two ends;
Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of first equipment and second equipment is oppositely arranged, and the receiving end of the transmitting terminal of second equipment and first equipment is oppositely arranged;
Whether the existence through judging its receiving end laser signal of every equipment, monitors the break-make situation of this road light beam; Simultaneously, through reading the break-make situation that the signal that is modulated in this light obtains another road light beam;
Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, and the signal strength information with its receiving end is modulated in the emission light simultaneously, sends to the equipment on opposite.
As a kind of preferred version of the present invention, said transmitting terminal emission laser signal, laser signal not only uses as detecting light, also is the carrier that two equipment transmit information;
Emitted laser signal inner packet contains information parameter, realizes the communication between first equipment, second equipment.
As a kind of preferred version of the present invention, adopt laser modulation technique, the mode of modulating through amplitude modulation is modulated to numerical information in the laser; At first digital signal is modulated in the carrier wave of 38KHz, again the signal after the modulation is added in the light signal; Like this, for the light signal of some cycles, represent when having the laser of 38KHz that 1 of digital signal, 38KHz laser do not exist and then represent digital signaling zero; Through photoelectric conversion device light signal is converted into initial electric signal again at receiving end, signal is removed the 38KHz carrier wave through demodulator circuit and is obtained digital signal, reads acquisition transmitting terminal information conveyed thereby signal is received device;
Laser becomes the carrier of communication, can accomplish the interactive communicate of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal is sent 8 information continuously, and each is 1 or 0, stop to send one section setting-up time then, continue to send 8 bit data afterwards; Like this, the send mode of data is rendered as alternately and sends, and is one group with 8 bit data, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has the object invasion, also is the carrier of Data transmission; Digital signal is 8 bit data, and the unit interval is sent a certain amount of number that gets, and accomplishes information communication;
Information format is that 8 bit data are one group, and the unit interval is sent a certain amount of data set; The data number that receiver receives in utilizing sometime judges as accurate whether light is stopped, and the standard of blocking time; In the setting-up time section, transmitting terminal is fixing to send A group data, if receiving end receives A group data, then system works is normal; Be less than the A group if the data that receive are B, represent that then light has been stopped a period of time; Through because the cycle of emission data set is known, through calculating the numerical value of A-B, multiply by the emission cycle data again, obtain the precise time that light is blocked.
As a kind of preferred version of the present invention, as A-B during greater than certain setting threshold, system judges and invades that startup warning LED display board alarm lamp is bright, the relay output alarm signal.
As a kind of preferred version of the present invention, when meeting accident incident, the 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 kind of preferred version of the present invention, the packets of information of unit interval emission some in laser, through measuring packet loss quantity, the time length that accurate Laser Measurement is blocked is got rid of interference through the short warning of shielding blocking-up time and is reported by mistake;
Current device emitted laser information comprises the strength information that this equipment receives light; Every equipment can obtain opposite equipment to the intensity situation that its emission light receives like this, guarantees that the self-adaptation of laser instrument emissive power is regulated, and laser power keeps constant through regulating the light intensity that guarantees receiving end automatically;
At first dispose the light intensity parameter of standard in every equipment, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of this machine emission laser needs the equipment utilization light signal on opposite to send on the receiver of this machine; Through reading the feedback information of receiver, just can obtain the light intensity situation of this machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power through the mode that increases energy of lasers, make to obtain better signal by corresponding receiving end; If still can't reach specified reception when laser instrument is adjusted to maximum, then show an outrange warning, the display board lamp brightens; When the light signal of feedback is excessive, exceeding the light intensity representative value of configuration, weaken the intensity of laser accordingly, reach and save the purpose that energy reduces power consumption.
A kind of alarm detection system based on laser communications, said system comprises two reception transmitting apparatus: first equipment, second equipment; Two equipment are separately positioned on the guarded region two ends;
Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of first equipment and second equipment is oppositely arranged, and the receiving end of the transmitting terminal of second equipment and first equipment is oppositely arranged;
Whether the existence through judging its receiving end laser signal of every equipment, monitors the break-make situation of this road light beam; Simultaneously, through reading the break-make situation that the signal that is modulated in this light obtains another road light beam; Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, and the signal strength information with its receiving end is modulated in the emission light simultaneously, sends to the equipment on opposite.
As a kind of preferred version of the present invention, said transmitting terminal emission laser signal, laser signal not only uses as detecting light, also is the carrier that two equipment transmit information;
Emitted laser signal inner packet contains information parameter, realizes the communication between first equipment, second equipment.
As a kind of preferred version of the present invention, adopt laser modulation technique, the mode of modulating through amplitude modulation is modulated to numerical information in the laser; At first digital signal is modulated in the carrier wave of 38KHz, again the signal after the modulation is added in the light signal; Like this, for the light signal of some cycles, represent when having the laser of 38KHz that 1 of digital signal, 38KHz laser do not exist and then represent digital signaling zero; Through photoelectric conversion device light signal is converted into initial electric signal again at receiving end, signal is removed the 38KHz carrier wave through demodulator circuit and is obtained digital signal, reads acquisition transmitting terminal information conveyed thereby signal is received device;
Laser becomes the carrier of communication, can accomplish the interactive communicate of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal is sent 8 information continuously, and each is 1 or 0, stop to send one section setting-up time then, continue to send 8 bit data afterwards; Like this, the send mode of data is rendered as alternately and sends, and is one group with 8 bit data, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has the object invasion, also is the carrier of Data transmission; Digital signal is 8 bit data, and the unit interval is sent a certain amount of number that gets, and accomplishes information communication;
Information format is that 8 bit data are one group, and the unit interval is sent a certain amount of data set; The data number that receiver receives in utilizing sometime judges as accurate whether light is stopped, and the standard of blocking time; In the setting-up time section, transmitting terminal is fixing to send A group data, if receiving end receives A group data, then system works is normal; Be less than the A group if the data that receive are B, represent that then light has been stopped a period of time; Through because the cycle of emission data set is known, through calculating the numerical value of A-B, multiply by the emission cycle data again, obtain the precise time that light is blocked; As A-B during greater than certain setting threshold, system judges and invades that startup warning LED display board warning etc. are bright, the relay output alarm signal.
As a kind of preferred version of the present invention, when meeting accident incident, the triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm;
The packets of information of unit interval emission some in laser, through measuring packet loss quantity, the time length that accurate Laser Measurement is blocked is got rid of interference through the short warning of shielding blocking-up time and is reported by mistake;
Current device emitted laser information comprises the strength information that this equipment receives light; Every equipment can obtain opposite equipment to the intensity situation that its emission light receives like this, guarantees that the self-adaptation of laser instrument emissive power is regulated, and laser power keeps constant through regulating the light intensity that guarantees receiving end automatically;
At first dispose the light intensity parameter of standard in every equipment, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of this machine emission laser needs the equipment utilization light signal on opposite to send on the receiver of this machine; Through reading the feedback information of receiver, just can obtain the light intensity situation of this machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power through the mode that increases energy of lasers, make to obtain better signal by corresponding receiving end; If still can't reach specified reception when laser instrument is adjusted to maximum, then show an outrange warning, the display board lamp brightens; When the light signal of feedback is excessive, exceeding the light intensity representative value of configuration, weaken the intensity of laser accordingly, reach and save the purpose 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 modulation; Laser beam completion information is simultaneously transmitted and intrusion detection, can realize self-regulation emission light intensity, and show two ways of optical signals intensity respectively; Can output system failure message, the time that accurate Calculation laser is blocked and effective shielding wrong report source.
Description of drawings
Fig. 1-1, Fig. 1-2 are the laser avoidance device schematic views.
Fig. 2 is the LED display board synoptic 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 the laser avoidance device system chart.
Fig. 5 is A, two machine data communication sequences of B figure.
Fig. 6 is communication information content and mode synoptic diagram.
Fig. 7 is for to be modulated to the driving circuit in the laser with Serial Port Information.
Fig. 8 is the ADC sample circuit of silicon photocell.
Fig. 9 is a system data communication synoptic diagram of the present invention.
Embodiment
Specify the preferred embodiments of the present invention below in conjunction with accompanying drawing.
Embodiment one
The present invention has disclosed a kind of alarm detection method based on laser communications, and said method comprises: adopt the twin-beam detection mode, two reception transmitting apparatus are set: first equipment, second equipment; Two equipment are separately positioned on the guarded region two ends; Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of first equipment and second equipment is oppositely arranged, and the receiving end of the transmitting terminal of second equipment and first equipment is oppositely arranged; Whether the existence through judging its receiving end laser signal of every equipment, monitors the break-make situation of this road light beam; Simultaneously, through reading the break-make situation that the signal that is modulated in this light obtains another road light beam; Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, and the signal strength information with its receiving end is modulated in the emission light simultaneously, sends to the equipment on opposite.
Said transmitting terminal emission laser signal, laser signal not only uses as detecting light, also is the carrier that two equipment transmit information; Emitted laser signal inner packet contains information parameter, realizes the communication between first equipment, second equipment.
The present invention adopts laser modulation technique, and the mode of modulating through amplitude modulation is modulated to numerical information in the laser; At first digital signal is modulated in the carrier wave of 38KHz, again the signal after the modulation is added in the light signal; Like this, for the light signal of some cycles, represent when having the laser of 38KHz that 1 of digital signal, 38KHz laser do not exist and then represent digital signaling zero; Through photoelectric conversion device light signal is converted into initial electric signal again at receiving end, signal is removed the 38KHz carrier wave through demodulator circuit and is obtained digital signal, reads acquisition transmitting terminal information conveyed thereby signal is received device.
Laser becomes the carrier of communication, can accomplish the interactive communicate of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal is sent 8 information continuously, and each is 1 or 0, stop to send one section setting-up time then, continue to send 8 bit data afterwards; Like this, the send mode of data is rendered as alternately and sends, and is one group with 8 bit data, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has the object invasion, also is the carrier of Data transmission; Digital signal is 8 bit data, and the unit interval is sent a certain amount of number that gets, and accomplishes information communication.
Information format is that 8 bit data are one group, and the unit interval is sent a certain amount of data set; The data number that receiver receives in utilizing sometime judges as accurate whether light is stopped, and the standard of blocking time; In the setting-up time section, transmitting terminal is fixing to send A group data, if receiving end receives A group data, then system works is normal; Be less than the A group if the data that receive are B, represent that then light has been stopped a period of time; Through because the cycle of emission data set is known, through calculating the numerical value of A-B, multiply by the emission cycle data again, obtain the precise time that light is blocked.As A-B during greater than certain setting threshold, system judges and invades that startup warning LED display board alarm lamp is bright, the relay output alarm signal; When meeting accident incident, the triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm.
The packets of information of unit interval emission some in laser, through measuring packet loss quantity, the time length that accurate Laser Measurement is blocked is got rid of interference through the short warning of shielding blocking-up time and is reported by mistake.
Current device emitted laser information comprises the strength information that this equipment receives light; Every equipment can obtain opposite equipment to the intensity situation that its emission light receives like this, guarantees that the self-adaptation of laser instrument emissive power is regulated, and laser power keeps constant through regulating the light intensity that guarantees receiving end automatically.
At first dispose the light intensity parameter of standard in every equipment, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of this machine emission laser needs the equipment utilization light signal on opposite to send on the receiver of this machine; Through reading the feedback information of receiver, just can obtain the light intensity situation of this machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power through the mode that increases energy of lasers, make to obtain better signal by corresponding receiving end; If still can't reach specified reception when laser instrument is adjusted to maximum, then show an outrange warning, the display board lamp brightens; When the light signal of feedback is excessive, exceeding the light intensity representative value of configuration, weaken the intensity of laser accordingly, reach and save the purpose that energy reduces power consumption.
More than disclosed alarm detection method of the present invention, the present invention also discloses a kind of alarm detection system based on laser communications when disclosing said method, and said system comprises two reception transmitting apparatus: first equipment, second equipment; Two equipment are separately positioned on the guarded region two ends.Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of first equipment and second equipment is oppositely arranged, and the receiving end of the transmitting terminal of second equipment and first equipment is oppositely arranged.Whether the existence through judging its receiving end laser signal of every equipment, monitors the break-make situation of this road light beam; Simultaneously, through reading the break-make situation that the signal that is modulated in this light obtains another road light beam; Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, and the signal strength information with its receiving end is modulated in the emission light simultaneously, sends to the equipment on opposite.
Said transmitting terminal emission laser signal, laser signal not only uses as detecting light, also is the carrier that two equipment transmit information; Emitted laser signal inner packet contains information parameter, realizes the communication between first equipment, second equipment.
Adopt laser modulation technique, the mode of modulating through amplitude modulation is modulated to numerical information in the laser; At first digital signal is modulated in the carrier wave of 38KHz, again the signal after the modulation is added in the light signal; Like this, for the light signal of some cycles, represent when having the laser of 38KHz that 1 of digital signal, 38KHz laser do not exist and then represent digital signaling zero; Through photoelectric conversion device light signal is converted into initial electric signal again at receiving end, signal is removed the 38KHz carrier wave through demodulator circuit and is obtained digital signal, reads acquisition transmitting terminal information conveyed thereby signal is received device.
Laser becomes the carrier of communication, can accomplish the interactive communicate of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal is sent 8 information continuously, and each is 1 or 0, stop to send one section setting-up time then, continue to send 8 bit data afterwards; Like this, the send mode of data is rendered as alternately and sends, and is one group with 8 bit data, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has the object invasion, also is the carrier of Data transmission; Digital signal is 8 bit data, and the unit interval is sent a certain amount of number that gets, and accomplishes information communication.
Information format is that 8 bit data are one group, and the unit interval is sent a certain amount of data set; The data number that receiver receives in utilizing sometime judges as accurate whether light is stopped, and the standard of blocking time; In the setting-up time section, transmitting terminal is fixing to send A group data, if receiving end receives A group data, then system works is normal; Be less than the A group if the data that receive are B, represent that then light has been stopped a period of time; Through because the cycle of emission data set is known, through calculating the numerical value of A-B, multiply by the emission cycle data again, obtain the precise time that light is blocked; As A-B during greater than certain setting threshold, system judges and invades that startup warning LED display board warning etc. are bright, the relay output alarm signal.
When meeting accident incident, the triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm; The packets of information of unit interval emission some in laser, through measuring packet loss quantity, the time length that accurate Laser Measurement is blocked is got rid of interference through the short warning of shielding blocking-up time and is reported by mistake; Current device emitted laser information comprises the strength information that this equipment receives light; Every equipment can obtain opposite equipment to the intensity situation that its emission light receives like this, guarantees that the self-adaptation of laser instrument emissive power is regulated, and laser power keeps constant through regulating the light intensity that guarantees receiving end automatically.
At first dispose the light intensity parameter of standard in every equipment, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of this machine emission laser needs the equipment utilization light signal on opposite to send on the receiver of this machine; Through reading the feedback information of receiver, just can obtain the light intensity situation of this machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power through the mode that increases energy of lasers, make to obtain better signal by corresponding receiving end; If still can't reach specified reception when laser instrument is adjusted to maximum, then show an outrange warning, the display board lamp brightens; When the light signal of feedback is excessive, exceeding the light intensity representative value of configuration, weaken the intensity of laser accordingly, reach and save the purpose that energy reduces power consumption.
Embodiment two
1, two mutual communications of machine:
In design, adopted the technology of Laser Modulation, information has been added in the laser through the mode of amplitude modulation modulation.System is made up of two pairs of instruments, instrument is not all had the function of transmitting and receiving, and transmits and receives respectively to intersect and be arranged in two paths of signals, and is as shown in Figure 3.The laser of a machine is transmitted into information in the receiving trap of machine on the other side through transmitter.Machine on the other side receives laser, and the signal of monitoring in the laser obtains the data such as break-make, emissive power, configuration information of laser through judgement.The machine on opposite sends in this machine through identical mode in the data with oneself then.
Among Fig. 3, a machine is provided with laser avoidance device A 31, first via transmitter 32, No. the second receiver 34; First via transmitter 32 transmitting terminals are provided with level crossing anti-reflection film 33, No. the second receiver 34 and comprise silicon photocell 35, convex lens 36, and convex lens 36 are used to converge.Another machine is provided with first via receiver 37, laser avoidance device B 38, No. the second transmitter 39.
The present invention has adopted and has utilized the mode of on-off circuit driving laser diode to realize in laser amplitude modulation; At first design a kind of oscillatory circuit; Can export the switching signal of certain frequency; And utilize this signal driving laser diode that opens the light, and make it to send the blinking light of corresponding frequencies, use this signal as carrier wave.Corresponding with it, adopt silicon photocell to receive laser signal at receiving end, and be translated into electric signal, again through the interference of other wave band of BPF. shielding, finally obtain the light pulse signal of this frequency.
Next, the present invention just can add signal in the carrier wave to and goes, and selects the serial signal of 112500 baud rates for use, and with the Enable Pin of this signal input 38KHz oscillatory circuit.When serial signal is that high level is, the 38KHz light signal that laser instrument output is continuous, on the contrary serial signal is zero, does not then have light signal output.Whether like this, exist through the light signal that detects 38KHz at receiving end, the serial information that just can read emission comes.
The technology that adopts among the present invention is, emission laser is carried out the AM modulation with the signal of serial ports output, and therefore, laser is not only light intensity, break-make whether carrier, also is the carrier of signal.Photoelectric detector obtained is not only whether break-make of light path, also has opposite machine information transmitted.Adopting baud rate among the present invention is that the information format of 112500 serial ports is carried out communication, and just light signal has carrier signal and rs 232 serial interface signal to be formed by stacking.The information light signal that at first utilizes serial ports to send when Serial Port Information is zero, does not have light to send, when serial ports sends for the 38KHz light after then modulation being arranged 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 FET is in high-impedance state, and laser tube is not worked; When signal is chip conducting for the moment, FET 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, handles as shown in Figure 7ly through the ADC sample circuit, and the rs 232 serial interface signal after just can obtaining to reduce is also discerned by single-chip microcomputer C8051F040.
The method that intrusion detection of the present invention is adopted is, the unit interval is fixing sends a certain amount of data, and receiving end receives data and also detects its validity, just can judge whether that through judging the quantity that receives valid data in this short time light signal is blocked.If detect data less than must threshold value, system just sends alerting signal.Data can also be as the carrier of information transmission simultaneously.
The data that light signal sends not only are used to calculate the blocking-up time, also be used to write down current this machine receiving end intensity signal, and whether two paths of signals need to report to the police.The form of information is following:
First of information: start bit machine A sends 0xAA, and machine B sends 0xBB;
Second of information: intensity signal 0xFF representes that the strongest 0x00 is for a little less than;
The 3rd of information: whether current this road signal is good, is not to be 0x02 for 0x01;
The 4th of information: whether laser intensity needs to regulate, and needs to raise 0x01, needs downward modulation 0x02, need not to regulate 0x03;
The 5th of information: stop bit is unified to be 0x55.
The transmission that in information link, circulates of these five data when reading of data is 0xAA, begins to handle, and finishes to 0x55.
Handle through receiver, the LED viewing area that can control machine side surface shows that A1～A4 is a first via signal intensity, and B1～B4 is the second tunnel signal intensity, and C1 reports to the police for system's outrange, and C2 is the saturated warning of system, and C3 is system's Normal Alarm.When system's Normal Alarm, the relay work of machine, outputs level signals drives warning device work, visible Fig. 2.
2, accurately the Laser Measurement blocking-up time is reduced rate of false alarm:
As indicated above, through the number of the unit of account information that receiving end is received in the time, and with this quantity with standard number contrast, just can learn whether light is blocked and the blocking-up time.
Light signal is the carrier of serial data, and the serial data per second of 11520 baud rates can transmit the data of 1440 8 data bit at most continuously, and is as shown in Figure 9.Among 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.
The communication mode that has adopted per second to send for 500 times among the present invention, as shown in Figure 6, at first the A machine is started working and is sent the wait of data B machine, also gets into after the A machine sends and accomplishes and waits for.After the B machine is received data, handle judgement, sending data to the A machine then, once circulation.And system's every interval certain hour can detect the quantity of the data that A, B two machines receive, if there is object losing of data can occur through this, the quantity through computational data is lost just can obtain the concrete time that laser is blocked accordingly.Here adopted the two-way crossover for the mode of sending, when guaranteeing on a certain road light work or not in another road, can avoid crosstalking of two paths of signals like this, avoided possibly causing the aliasing mistake because of one road signal shines in another road signal.
The present invention has adopted per second to send for 500 times, and owing to A, B two machines hocket, actual every machine per second sends 250 times, and therefore, the minimum resolution of blocking-up time is 6.4 milliseconds.Through distinguishing the blocking-up time response of different things, just can shield some interfering external cause wrong reports.For example mostly the pedestrian is 0.2～0.5 second through the time of laser alarm installation, through limit this characteristic just can shield other for example leaf fall the warning that raindrop etc. cause, and their blocking-up time generally at 0.1 second once.
3, show that the intensity signal that receives 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 are as shown in Figure 5, the first via signal of A machine for emission the second road signal for receiving, the first via signal of opposite B machine just is emission for receiving the second road signal.Simultaneously, transmitter is at the emission laser that is single firm power, but launches the amplitude modulation digital optical signal that has information content of modulated mistake.An a certain like this machine just can send to the machine on opposite with the situation of this machine through light signal, and the machine on opposite is analyzed the information that comprises in the laser, combines the measurement to the light intensity of laser own again, just can obtain the light intensity of two paths of signals.As shown in Figure 6, this machine of A machinery utilization receiver is through detecting B machine emitted laser, judges whether laser exists and light intensity magnitude can obtain the situation of the second road signal; The A machine is that carrier is transmitted to the B machine with the second tunnel the situation transmitter through it with first via laser then.The B machine has received the laser of A machine, also through judging laser size and having or not, obtains the situation of first via signal, and analyzing with first via laser is the information of carrier again, then can obtain the second tunnel situation.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, and the signal by superposeing in this machine processing laser of one of them signal obtains, and this machine analysis laser intensity obtains during another signal.
Like Fig. 1-1, Fig. 1-2, shown in Figure 2, every machine side surface all has one group of LED module that is used to show, has represented the light intensity of two paths of signals respectively, through observing, can clearly obtain the strength information of two paths of signals.Like this through judging the intensity of two paths of signals; When normal operation, just can infer whether two paths of signals is blocked; When debugging is installed, just can be used for checking laser whether to be radiated at accurately on the photoelectric sensor, through regulating mechanical parts, when light intensity maximum that LED shows for to regulate successfully.So just alleviated the problem of laser avoidance device debugging difficult installation to a certain extent.
4, the self-adaptation of emission light intensity is regulated:
At first dispose the light intensity parameter of standard in every machine, because transmitter and its corresponding receiving end be not on a machine, so the reception condition of this machine emission laser needs the machinery utilization light signal on opposite to send on the receiver of this machine.Through reading the feedback information of receiver, just can obtain the light intensity situation of this machine transmitter institute respective optical path.When light intensity is not enough, can promote luminous power through the mode that increases energy of lasers, make to obtain better signal by corresponding receiving end.If still can't reach specified reception when laser instrument is adjusted to maximum, then show an outrange warning, display board C1 lamp brightens, and is as shown in Figure 2.When the light signal that should feed back together exceeds the light intensity representative value of configuration when excessive, can weaken the intensity of laser accordingly, reach and save the purpose that energy reduces power consumption.The present invention has just realized the function that self-adaptation is regulated laser intensity like this.
5, the system failure is reported to the police:
The present invention uses silicon photocell as photoelectric sensor, is used to receive laser, so just can obtain the volume unit of laser, and is as shown in Figure 4, and after photoelectricity was gathered light intensity signal, one road signal amplified back input serial ports through shaping filter; Then through the ADC sampling of external trigger, the output voltage amplitude that obtains sensor is an intensity signal on another road.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 rising edge of same generation behind the electric signal, then with it as a trigger pip.Whenever detecting rising edge, just trigger ADC sampling for several times, and the intensity size of average as current demand signal of will sampling.
In sum; The alarm detection method and system that the present invention proposes based on laser communications, the technology of the communication of employing laser amplitude modulation, laser beam completion information is simultaneously transmitted and intrusion detection; Can realize self-regulation emission light intensity; And show two ways of optical signals intensity respectively, can output system failure message, the time that accurate Calculation laser is blocked and effective shielding wrong report source.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of the embodiment that is disclosed and change are possible, and the replacement of embodiment is known with the various parts of equivalence for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or essential characteristic, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to the embodiment that is disclosed.
Claims (10)
1. alarm detection method based on laser communications is characterized in that said method comprises:
Adopt the twin-beam detection mode, two reception transmitting apparatus are set: first equipment, second equipment; Two equipment are separately positioned on the guarded region two ends;
Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of first equipment and second equipment is oppositely arranged, and the receiving end of the transmitting terminal of second equipment and first equipment is oppositely arranged;
Whether the existence through judging its receiving end laser signal of every equipment, monitors the break-make situation of this road light beam; Simultaneously, through reading the break-make situation that the signal that is modulated in this light obtains another road light beam;
Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, and the signal strength information with its receiving end is modulated in the emission light simultaneously, sends to the equipment on opposite.
2. the alarm detection method based on laser communications according to claim 1 is characterized in that:
Said transmitting terminal emission laser signal, laser signal not only uses as detecting light, also is the carrier that two equipment transmit information;
Emitted laser signal inner packet contains information parameter, realizes the communication between first equipment, second equipment.
3. the alarm detection method based on laser communications according to claim 1 is characterized in that:
Adopt laser modulation technique, the mode of modulating through amplitude modulation is modulated to numerical information in the laser; At first digital signal is modulated in the carrier wave of 38KHz, again the signal after the modulation is added in the light signal; Like this, for the light signal of some cycles, represent when having the laser of 38KHz that 1 of digital signal, 38KHz laser do not exist and then represent digital signaling zero; Through photoelectric conversion device light signal is converted into initial electric signal again at receiving end, signal is removed the 38KHz carrier wave through demodulator circuit and is obtained digital signal, reads acquisition transmitting terminal information conveyed thereby signal is received device;
Laser becomes the carrier of communication, can accomplish the interactive communicate of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal is sent 8 information continuously, and each is 1 or 0, stop to send one section setting-up time then, continue to send 8 bit data afterwards; Like this, the send mode of data is rendered as alternately and sends, and is one group with 8 bit data, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has the object invasion, also is the carrier of Data transmission; Digital signal is 8 bit data, and the unit interval is sent a certain amount of number that gets, and accomplishes information communication;
Information format is that 8 bit data are one group, and the unit interval is sent a certain amount of data set; The data number that receiver receives in utilizing sometime judges as accurate whether light is stopped, and the standard of blocking time; In the setting-up time section, transmitting terminal is fixing to send A group data, if receiving end receives A group data, then system works is normal; Be less than the A group if the data that receive are B, represent that then light has been stopped a period of time; Through because the cycle of emission data set is known, through calculating the numerical value of A-B, multiply by the emission cycle data again, obtain the precise time that light is blocked.
4. the alarm detection method based on laser communications according to claim 3 is characterized in that:
As A-B during greater than certain setting threshold, system judges and invades that startup warning LED display board alarm lamp is bright, the relay output alarm signal.
5. the alarm detection method based on laser communications according to claim 1 is characterized in that:
When meeting accident incident, the triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm.
6. the alarm detection method based on laser communications according to claim 1 is characterized in that:
The packets of information of unit interval emission some in laser, through measuring packet loss quantity, the time length that accurate Laser Measurement is blocked is got rid of interference through the short warning of shielding blocking-up time and is reported by mistake;
Current device emitted laser information comprises the strength information that this equipment receives light; Every equipment can obtain opposite equipment to the intensity situation that its emission light receives like this, guarantees that the self-adaptation of laser instrument emissive power is regulated, and laser power keeps constant through regulating the light intensity that guarantees receiving end automatically;
At first dispose the light intensity parameter of standard in every equipment, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of this machine emission laser needs the equipment utilization light signal on opposite to send on the receiver of this machine; Through reading the feedback information of receiver, just can obtain the light intensity situation of this machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power through the mode that increases energy of lasers, make to obtain better signal by corresponding receiving end; If still can't reach specified reception when laser instrument is adjusted to maximum, then show an outrange warning, the display board lamp brightens; When the light signal of feedback is excessive, exceeding the light intensity representative value of configuration, weaken the intensity of laser accordingly.
7. the alarm detection system based on laser communications is characterized in that, said system comprises two reception transmitting apparatus: first equipment, second equipment; Two equipment are separately positioned on the guarded region two ends;
Every equipment comprises a transmitting terminal and a receiving end, and the receiving end of the transmitting terminal of first equipment and second equipment is oppositely arranged, and the receiving end of the transmitting terminal of second equipment and first equipment is oppositely arranged;
Whether the existence through judging its receiving end laser signal of every equipment, monitors the break-make situation of this road light beam; Simultaneously, through reading the break-make situation that the signal that is modulated in this light obtains another road light beam; Afterwards, its transmitting terminal of each equipment utilization sends another road and detects light beam, and the signal strength information with its receiving end is modulated in the emission light simultaneously, sends to the equipment on opposite.
8. the alarm detection system based on laser communications according to claim 7 is characterized in that:
Said transmitting terminal emission laser signal, laser signal not only uses as detecting light, also is the carrier that two equipment transmit information;
Emitted laser signal inner packet contains information parameter, realizes the communication between first equipment, second equipment.
9. the alarm detection system based on laser communications according to claim 7 is characterized in that:
Adopt laser modulation technique, the mode of modulating through amplitude modulation is modulated to numerical information in the laser; At first digital signal is modulated in the carrier wave of 38KHz, again the signal after the modulation is added in the light signal; Like this, for the light signal of some cycles, represent when having the laser of 38KHz that 1 of digital signal, 38KHz laser do not exist and then represent digital signaling zero; Through photoelectric conversion device light signal is converted into initial electric signal again at receiving end, signal is removed the 38KHz carrier wave through demodulator circuit and is obtained digital signal, reads acquisition transmitting terminal information conveyed thereby signal is received device;
Laser becomes the carrier of communication, can accomplish the interactive communicate of two equipment, transmits important information; In addition, the data of transmission have specific form, and digital signal is sent 8 information continuously, and each is 1 or 0, stop to send one section setting-up time then, continue to send 8 bit data afterwards; Like this, the send mode of data is rendered as alternately and sends, and is one group with 8 bit data, sends the information of certain group in the unit interval; Laser is not only the signal whether reflection has the object invasion, also is the carrier of Data transmission; Digital signal is 8 bit data, and the unit interval is sent a certain amount of number that gets, and accomplishes information communication;
Information format is that 8 bit data are one group, and the unit interval is sent a certain amount of data set; The data number that receiver receives in utilizing sometime judges as accurate whether light is stopped, and the standard of blocking time; In the setting-up time section, transmitting terminal is fixing to send A group data, if receiving end receives A group data, then system works is normal; Be less than the A group if the data that receive are B, represent that then light has been stopped a period of time; Through because the cycle of emission data set is known, through calculating the numerical value of A-B, multiply by the emission cycle data again, obtain the precise time that light is blocked; As A-B during greater than certain setting threshold, system judges and invades that startup warning LED display board warning etc. are bright, the relay output alarm signal.
10. the alarm detection system based on laser communications according to claim 7 is characterized in that:
When meeting accident incident, the triggering system fault alarm, the type of alarm that the system failure is reported to the police is different from common intrusion alarm;
The packets of information of unit interval emission some in laser, through measuring packet loss quantity, the time length that accurate Laser Measurement is blocked is got rid of interference through the short warning of shielding blocking-up time and is reported by mistake;
Current device emitted laser information comprises the strength information that this equipment receives light; Every equipment can obtain opposite equipment to the intensity situation that its emission light receives like this, guarantees that the self-adaptation of laser instrument emissive power is regulated, and laser power keeps constant through regulating the light intensity that guarantees receiving end automatically;
At first dispose the light intensity parameter of standard in every equipment, because transmitter and its corresponding receiving end be not on an equipment, so the reception condition of this machine emission laser needs the equipment utilization light signal on opposite to send on the receiver of this machine; Through reading the feedback information of receiver, just can obtain the light intensity situation of this machine transmitter institute respective optical path; When light intensity is not enough, can promote luminous power through the mode that increases energy of lasers, make to obtain better signal by corresponding receiving end; If still can't reach specified reception when laser instrument is adjusted to maximum, then show an outrange warning, the display board lamp brightens; When the light signal of feedback is excessive, exceeding the light intensity representative value of configuration, weaken the intensity of laser accordingly.
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| CN106289361A (en) * | 2015-05-19 | 2017-01-04 | 科沃斯机器人股份有限公司 | The detection method of sensor reliability and oneself mobile processing means and 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 |
| 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 |
| CN106920353A (en) * | 2015-12-25 | 2017-07-04 | 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 |
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| CN108182777A (en) * | 2017-12-29 | 2018-06-19 | 北京奇虎科技有限公司 | Alarm method, apparatus and system based on laser-correlation technology |
| CN109637064A (en) * | 2019-01-29 | 2019-04-16 | 深圳市汉明电子有限公司 | Object deforms warning monitoring system and method |
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| 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 |
| 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 |
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| CN108182777A (en) * | 2017-12-29 | 2018-06-19 | 北京奇虎科技有限公司 | Alarm method, apparatus and system based on laser-correlation technology |
| CN111077584A (en) * | 2018-10-19 | 2020-04-28 | 北京天乐泰力科技发展有限公司 | Filtering processing method for laser correlation device |
| CN109637064A (en) * | 2019-01-29 | 2019-04-16 | 深圳市汉明电子有限公司 | Object deforms warning monitoring system and method |
| CN111243210A (en) * | 2020-01-15 | 2020-06-05 | 南宁学院 | Financial area monitoring system |
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