CN102651158A - Infrared laser correlation light wall type intrusion detector - Google Patents
Infrared laser correlation light wall type intrusion detector Download PDFInfo
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- CN102651158A CN102651158A CN2012101625082A CN201210162508A CN102651158A CN 102651158 A CN102651158 A CN 102651158A CN 2012101625082 A CN2012101625082 A CN 2012101625082A CN 201210162508 A CN201210162508 A CN 201210162508A CN 102651158 A CN102651158 A CN 102651158A
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Abstract
The invention relates to an infrared laser correlation light wall type intrusion detector. The infrared laser correlation light wall type intrusion detector comprises two parts, namely a transmitting end and a receiving end, and the false alarm rate and the missing alarm rate of intrusion detector can be significantly detected through an infrared laser correlation light wall, self-adaptive regulation of transmission power, an intelligent identification algorithm of an intrusion target and other means.
Description
Technical field
The present invention relates to a kind of safety precaution and use the intrusion detection device, the infrared laser correlation light wall formula intrusion detector that especially adopts the equally distributed infrared laser light of parallel transmission and light intensity wall to deploy troops on garrison duty with the correlation mode.
Background technology
Take precautions against the field at region security; The common infrared correlation intrusion detector that adopts infrared LED multiple beam correlation (end is launched a termination and received) mode to monitor in real time the concurrent alert signal of delivering newspaper of light beam blocking-up is used widely; Inherent shortcomings such as penetration capacity is low because ordinary light source exists, emission power consumption height; Many defectives such as cause that existing product ubiquity detection range is short, energy consumption is higher, unstable properties, rate of false alarm and rate of failing to report are all higher, largely limit comprehensively popularizing of this series products.Consider that laser is the directed beam of high brightness that a kind of stimulated radiation produces; The ordinary light source that produces than spontaneous radiation has good directionality, good, the strong coherence of monochromaticity, the angle of divergence is little, energy density is big, good (the light-path anti-electromagnetic interference capability is strong for penetration power strong (not influenced by rain, mist, snow, sand and dust etc.), anti-interference good (not receiving interference such as sunlight, light, thunder and lightning, electromagnetic wave basically), Electro Magnetic Compatibility; Do not produce electromagnetic interference (EMI) to external world) etc. advantage, therefore be specially adapted to the intrusion detection occasion of long distance, rugged surroundings, narrow optical channel.So for overcoming many defectives of existing common infrared correlative detector, adopting infrared laser is a kind of comparatively ideal solution as transmitting illuminant.
Yet existing infrared laser intrusion detector is still continued to use the infrared LED multiple beam correlation principle of common infrared correlative detector, and relative Conventional detectors does not have clear superiority on the properties of product, aspect mounting, commissioning and maintenance, still has following problem:
1) in little target intrusion detection occasion; Exist inevitable contradiction (low more between number of beams, rate of failing to report, reliability and the cost if rate of failing to report requires; Required number of beams is just many more, and system reliability is just low more, make, the installation and maintenance cost is corresponding also high more);
2) since only can the detecting intrusion target number of beams and the order of blocking-up, can't accurately convert projected length and variation, thereby be not easy to anti-tampering Intelligent Recognition intrusion target;
3) in remote intrusion detection occasion, transmitting terminal goes out optical power density and requires greatlyyer, is difficult to satisfy the requirement of shelter of state compulsory standard usually.
Summary of the invention
For remedying many deficiencies of existing infrared laser multiple beam correlation intrusion detector; The invention provides a kind of infrared laser correlation light wall formula intrusion detector; Can significantly reduce the rate of false alarm and the rate of failing to report of intrusion detector through means such as infrared laser correlation light wall, transmission power adaptation adjusting and intrusion target Intelligent Recognition algorithms.
A kind of infrared laser correlation light wall formula intrusion detector comprises transmitting terminal and receiving end composition; Transmitting terminal comprises laser transmission circuit, semiconductor laser, light intensity emission light path, to the light adjustment part; The laser transmission circuit noise spectra of semiconductor lasers passes on signal to make semiconductor laser launch infrared laser; Light intensity emission light path comprises accepts the word lens that infrared laser and infrared laser evenly are diffused as fan beam; Is the fan beam collimation transmitting terminal Fresnel Lenses of parallel beam, eliminates first of parasitic light in the parallel beam spuious diaphragm that disappears, the light beam that the adjustment transmitting terminal sends make that receiving end can receiving beam to the light adjustment part; Receiving end comprises: the infrared fileter that receives said light beam that transmitting terminal launches and said light beam carried out infrared filtering; Make that beam collimation is second of the light beam spuious diaphragm that disappears that is parallel to each other, the be parallel to each other detecting means of intensity of light beam of accept to be parallel to each other light beam and induction; Judging part can receive photosignal that detecting means responds to and judge whether to hinder the intrusion target of the beam propagation between transmitter and the receiver according to photosignal, and when judgement section judges had intrusion target, receiving end sent the alerting signal of crossing the border.
Further, infrared laser correlation light wall formula intrusion detector provided by the invention can also have such characteristic: word lens are the Bao Weier prism.
Further, infrared laser correlation light wall formula intrusion detector provided by the invention can also have such characteristic: detecting means comprises that receiving be parallel to each other light beam and the light beam that will be parallel to each other focuses on a receiving end Fresnel Lenses on the focus; And the photosignal on the induction focus and photosignal sent to the photoelectric sensor of judging part.
Further, infrared laser correlation light wall formula intrusion detector provided by the invention can also have such characteristic: detecting means is a photosensor arrays.
Further; Infrared laser correlation light wall formula intrusion detector provided by the invention can also have such characteristic: through improving design transmitting terminal Fresnel Lenses; Can make that fan beam is parallel in the middle of behind the transmitting terminal Fresnel Lenses, forming, the side is to the light beam of external diffusion, thereby convenient to the light debugging with reduce the wrong report that causes because of external disturbance.
Further, infrared laser correlation light wall formula intrusion detector provided by the invention can also comprise:
Transmission power adaptation adjusting portion; When the accurate identification of intrusion target takes place to weaken gradually, to influence in the signal intensity of receiving end or signal to noise ratio (S/N ratio) under the external interference operating mode; Receiving end sends steering order to transmitting terminal the emissive power of said semiconductor laser is carried out the self-adaptation adjusting, makes the signal intensity of said receiving end or signal to noise ratio (S/N ratio) keep constant.
Further; Infrared laser correlation light wall formula intrusion detector provided by the invention can also have such characteristic: it is the transmission power adaptation limited adjustment range of semiconductor laser behind the aging light decay of transmitting terminal that judging part adopts the principle of intrusion target Intelligent Recognition algorithm; The signal intensity of receiving end or signal to noise ratio (S/N ratio) can weaken gradually under the external interference operating mode; For avoiding influencing the accurate identification of intrusion target and prevent false alarm to non-intrusion target; The rate of decay of receiving end signal intensity is higher than threshold value in the time of must satisfying the target invasion, the attenuation ratio of receiving end signal intensity is lower than two conditions of threshold value when crossing the border warning, could trigger the output of reporting to the police of crossing the border.
Further, infrared laser correlation light wall formula intrusion detector provided by the invention can also have such characteristic: the expression formula of above-mentioned condition is:
In this formula: the T-systematic sampling cycle; The sequence thresholding of M-invasion signal transition time; N-sampled signal sequence (n=0,1 ... N; N is the sequence thresholding of alarm time of crossing the border); The signal intensity that u (t), u (t-MT), u (t+nT)-receiving end receive at t, (t-MT), (t+nT) respectively constantly; K
iThe rate of decay thresholding of receiving end signal intensity during the invasion of-target; K
a-attenuation ratio the thresholding of receiving end signal intensity when crossing the border warning.
Invention effect and effect
Infrared laser correlation light wall formula intrusion detector provided by the invention can pass through means such as infrared laser correlation light wall, transmission power adaptation adjusting and intrusion target Intelligent Recognition algorithm; Significantly reduce the rate of false alarm and the rate of failing to report of intrusion detector; Improve many deficiencies of existing infrared laser multiple beam correlation intrusion detector, can be adaptable across the various application occasions that comprises little target intrusion detection; In addition, because multiple beam is expanded to the transmission of light wall, transmitting terminal goes out optical power density significantly to be reduced, thus the requirement of shelter of the state compulsory standard that is content with very little; Moreover, because only must No. one semiconductor laser, thus remarkable elevator system reliability, reduction manufacturing, installation and maintenance cost.
Description of drawings
Fig. 1 be the light channel structure A of the infrared laser correlation light wall formula intrusion detector of the present invention in embodiment one side view (on), vertical view (descending) and sectional view (right side);
Fig. 2 be the light channel structure B of the infrared laser correlation light wall formula intrusion detector of the present invention in embodiment two side view (on), vertical view (descending) and sectional view (right side);
Fig. 3 is the electrical block diagram of the transmitting terminal of the infrared laser correlation light wall formula intrusion detector of the present invention in embodiment one;
Fig. 4 is the electrical block diagram of the receiving end of the infrared laser correlation light wall formula intrusion detector of the present invention in embodiment one;
Fig. 5 is the control flow chart of the intrusion target Intelligent Recognition algorithm of the infrared laser correlation light wall formula intrusion detector of the present invention in embodiment one;
Fig. 6 is the control timing figure of the intrusion target Intelligent Recognition algorithm of the infrared laser correlation light wall formula intrusion detector of the present invention in embodiment one.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Embodiment one
A kind of infrared laser correlation light wall formula intrusion detector comprises: transmitting terminal and receiving end are formed.
Fig. 3 is the electrical block diagram of the infrared laser correlation light wall formula intrusion detector transmitting terminal in the present embodiment one.As shown in Figure 3; The circuit structure of the transmitting terminal in the present embodiment mainly partly is made up of power circuit, microprocessor, driving circuit, RF receiving circuit, detaching-proof protection circuit, semiconductor laser etc.; Its principle is: RF receiving circuit receives the steering order from receiving end; And exporting steering order to microprocessor, microprocessor is exported width modulation (PWM) signal of certain amplitude by preset frequency modulation and dutycycle, through driving circuit pwm signal is carried out power amplification again; The work of driving semiconductor laser is externally exported thereby transfer electric signal to light signal; Power circuit carries out step-down, voltage stabilizing and Filtering Processing to the input power supply, for system provides satisfactory direct supply; The detaching-proof protection circuit is used for destruction or the dismounting behavior that the sensing transmitting terminal suffers, and through microprocessor trigger pip is loaded on pwm signal, transmits to receiving end with the optical communication mode again.
Fig. 1 be the light channel structure A of the infrared laser correlation light wall formula intrusion detector in the present embodiment side view (on), vertical view (descending) and sectional view (right side).As shown in Figure 1; The light channel structure A of intrusion detector is divided into transmitting terminal (1) and receiving end (2) two parts among the present invention; Transmitting terminal mainly is made up of above-mentioned laser transmission circuit, semiconductor laser (11), Bao Weier prism (12), transmitting terminal Fresnel Lenses (13) and the transmitting terminal spuious diaphragm optical modules such as (14) that disappears, and receiving end is mainly by infrared fileter (21), receiving end disappear spuious diaphragm (22), receiving end Fresnel Lenses (23), photoelectric sensor (24) and optical modules such as light adjustment part are constituted.Transmitting terminal produces the pulsed infrared collimated laser beam through semiconductor laser; (its line is superior to cylindrical lens through the Bao Weier prism again; Can eliminate the center focus of Gaussian beam and the marginal distribution of fading; Generate optical density evenly, good stability, fan beam that rectilinearity is good) laser beam is diffused as fan beam; Subsequently through the strip aspheric surface transmitting terminal Fresnel Lenses (condenser of complanation; Has frivolous advantage cheaply; Aspheric surface design can be eliminated ball-shaped aberration) will be parallel beam from the fan beam collimation of focus diffusion, at last through strip first disappear spuious diaphragm (light comb vias inner walls is the blacking hair side, is used for the parasitic light that the absorption lens mismachining tolerance causes) further behind the collimation parallel beam to receiving end send that a stifled bar tee section, light intensity are uniformly distributed with, the outside suitable correlation light wall (3) of diffusion in parallel transmission and side; Receiving end carries out filtering through the strip infrared fileter to infrared incident light wall; Obtain the collimation parallel beam through the strip receiving end spuious diaphragm that disappears again; Through strip receiving end Fresnel Lenses parallel beam is focused on the focus at last, photoelectric sensor receives the photosignal of this focus.Making the transmitting terminal emitted light beams can be received end to light adjustment part adjustment light beam well receives.For conveniently the light adjustment part being debugged and reducing the wrong report (external disturbances such as high wind, hail and vibration possibly cause the BEAM SQUINT receiving end) that causes because of external disturbance, the aspheric transmitting terminal Fresnel Lenses of the strip of transmitting terminal can make said fan beam behind said transmitting terminal Fresnel Lenses, form the light beam of middle parallel side to external diffusion through improving to design in addition.Secondly, improve light beam parallelism, just must reduce beam divergence angle, and the angle of divergence is directly proportional with optical wavelength, and the bright dipping bore be inversely proportional to; Therefore after optical maser wavelength is confirmed, the method that improves light beam parallelism has only and strengthens the bright dipping bore as far as possible.
Fig. 4 is the electrical block diagram of the receiving end of the infrared laser correlation light wall formula intrusion detector of the present invention in embodiment one.As shown in Figure 4; The circuit structure of the receiving end in the present embodiment mainly partly is made up of power circuit, signal conditioning circuit, microprocessor (comprising transmission power adaptation adjusting portion and judging part), driving circuit, radio-frequency transmissions circuit, signal output apparatus, warning device, detaching-proof protection circuit, aligning indicating circuit, photoelectric sensor etc.; Its principle is: the correlation light wall signal of the sensor part of receiving end self-emission in the future end transfers photosignal to; Through signal conditioning circuit amplify with filtering after input microprocessor; Microprocessor output power after transmission power adaptation adjusting and intrusion target Intelligent Recognition algorithm process is regulated and the alerting signal of crossing the border; Carry out power amplification through driving circuit again, externally export through signal output apparatus (comprising relay and data bus) and radio-frequency transmissions circuit; Power circuit carries out step-down, voltage stabilizing and Filtering Processing to the input power supply, for system provides satisfactory direct supply; The detaching-proof protection circuit is used for destruction or the dismounting behavior that the sensing receiving end suffers, and the tamper alerting signal unification of receiving end and/or transmitting terminal is externally exported by aforementioned manner by receiving end; Aim at indicating circuit and be used to indicate the degree of registration of transmitting terminal, judge whether alignment light electric transducer of optical axis through the brightness of range estimation LED lamp.
Fig. 5 is the control flow chart of the intrusion target Intelligent Recognition algorithm of the infrared laser correlation light wall formula intrusion detector of the present invention in embodiment one; Fig. 6 is the control timing figure of the intrusion target Intelligent Recognition algorithm of the infrared laser correlation light wall formula intrusion detector of the present invention in embodiment one.Like Fig. 5, shown in 6; The control flow and the sequential of intrusion target Intelligent Recognition algorithm are among the present invention: transmission power adaptation limited adjustment range behind the aging light decay of transmitting terminal; Like external interference such as window dust stratification, inclement weather, high light direct projections, the signal intensity of receiving end or signal to noise ratio (S/N ratio) can weaken gradually; For avoiding influencing the accurate identification of intrusion target; Prevent false alarm to non-intrusion target such as fallen leaves or toys; The report to the police trigger condition of output of crossing the border is: the rate of decay of receiving end signal intensity is higher than threshold value during the target invasion, and crosses the border that the attenuation ratio of receiving end signal intensity is lower than threshold value when reporting to the police.
That is:
And
In the formula: the T-systematic sampling cycle;
The sequence thresholding of M-invasion signal transition time;
N-sampled signal sequence (n=0,1 ... N; N is the sequence thresholding of alarm time of crossing the border);
The signal intensity that u (t), u (t-MT), u (t+nT)-receiving end receive at t, (t-MT), (t+nT) respectively constantly;
K
iThe rate of decay thresholding of receiving end signal intensity during the invasion of-target;
K
a-attenuation ratio the thresholding of receiving end signal intensity when crossing the border warning.
Embodiment two
Omitted in the present embodiment with embodiment one in identical structure form, identical structure is used identical numeral number.
Fig. 2 be the light channel structure B of the infrared laser correlation light wall formula intrusion detector of the present invention in basis side view (on), vertical view (descending) and sectional view (right side).As shown in Figure 2; The transmitting terminal of the light channel structure B of the infrared laser correlation light wall formula intrusion detector in this enforcement is identical with light channel structure A; And the detecting means of receiving end is photosensor arrays (25); When correlation light wall is partly or entirely blocked by intrusion target,, can realize the Intelligent Recognition of intrusion target equally through analog quantity or the switching value signal that photosensor arrays receives.
Embodiment effect and effect
In sum; Infrared laser correlation light wall formula intrusion detector in the foregoing description is through means such as infrared laser correlation light wall, transmission power adaptation adjusting and intrusion target Intelligent Recognition algorithms; Significantly reduce the rate of false alarm and the rate of failing to report of intrusion detector; Improve many deficiencies of existing infrared laser multiple beam correlation intrusion detector, can be adaptable across the various application occasions that comprises little target intrusion detection; In addition, because multiple beam is expanded to the transmission of light wall, transmitting terminal goes out optical power density significantly to be reduced, thus the requirement of shelter of the state compulsory standard that is content with very little; Moreover, because only must No. one semiconductor laser, thus remarkable elevator system reliability, reduction manufacturing, installation and maintenance cost.
Claims (8)
1. an infrared laser correlation light wall formula intrusion detector has receiving end and transmitting terminal composition, it is characterized in that:
Wherein, Said transmitting terminal comprises; Laser transmission circuit, semiconductor laser, light wall emission light path, to the light adjustment part; Said laser transmission circuit sends signal to said semiconductor laser and makes said semiconductor laser emission infrared laser, and said smooth wall emission light path comprises to be accepted said infrared laser and said infrared laser evenly is diffused as word lens of fan beam, the said fan beam collimation transmitting terminal Fresnel Lenses that is parallel beam; The transmitting terminal of eliminating the parasitic light in the said parallel beam spuious diaphragm that disappears, adjust light beam that said transmitting terminal sends make said receiving end can receive said light beam to the light adjustment part;
Said receiving end comprises: receive the infrared fileter that carries out infrared filtering from the said light beam of said transmitting terminal and to said light beam; Make that said beam collimation is the receiving end of the light beam spuious diaphragm that disappears that is parallel to each other, receive the said light beam and obtain the detecting means of the said beam intensity that is parallel to each other of being parallel to each other; Said judging part; Can receive the photosignal of said detecting means gained and judge whether to hinder the intrusion target of the beam propagation between said transmitter and the said receiver according to signal intensity; When said judgement section judges had said intrusion target, said receiving end was exported the alerting signal of crossing the border.
2. infrared laser correlation light wall formula intrusion detector according to claim 1 is characterized in that:
Wherein, said word lens are the Bao Weier prism.
3. infrared laser correlation light wall formula intrusion detector according to claim 1 is characterized in that:
Wherein, said detecting means comprises: receive the said light beam that is parallel to each other and also the said light beam that is parallel to each other is focused to the receiving end Fresnel Lenses on the focus; And respond to the photosignal on the said focus and said signal intensity sent to the photoelectric sensor of said judging part.
4. infrared laser correlation light wall formula intrusion detector according to claim 1 is characterized in that:
Wherein, said detecting means is a photosensor arrays.
5. infrared laser correlation light wall formula intrusion detector according to claim 1 is characterized in that:
Wherein, said transmitting terminal Fresnel Lenses is through improving design, makes said fan beam through parallel in the middle of forming behind the said transmitting terminal Fresnel Lenses, the side light beam to external diffusion, thereby convenient to the light debugging with reduce the wrong report that causes because of external disturbance.
6. infrared laser correlation light wall formula intrusion detector according to claim 1 is characterized in that, also comprises:
Transmission power adaptation adjusting portion; When the accurate identification of intrusion target took place to weaken gradually, influence for the signal intensity of receiving end or signal to noise ratio (S/N ratio) under the external interference operating mode, receiving end sends steering order to transmitting terminal to carry out the self-adaptation adjusting to the emissive power of said semiconductor laser and makes the signal intensity of said receiving end or signal to noise ratio (S/N ratio) keep constant.
7. infrared laser correlation light wall formula intrusion detector according to claim 1 is characterized in that:
Wherein, Said judging part adopts intrusion target Intelligent Recognition algorithm; Its principle is: the transmission power adaptation limited adjustment range of said semiconductor laser behind the aging light decay of said transmitting terminal; The signal intensity of said receiving end or signal to noise ratio (S/N ratio) can weaken gradually under the external interference operating mode, for avoiding influencing the accurate identification of intrusion target, and prevent the false alarm to non-intrusion target; The rate of decay of receiving end signal intensity is higher than threshold value in the time of must satisfying the target invasion, the attenuation ratio of receiving end signal intensity is lower than two conditions of threshold value when crossing the border warning, could trigger the output of reporting to the police of crossing the border.
8. infrared laser correlation light wall formula intrusion detector according to claim 7, it is characterized in that: the expression formula of said condition is: in
and
this formula: the T-systematic sampling cycle;
The sequence thresholding of M-invasion signal transition time;
N-sampled signal sequence (n=0,1 ... N; N is the sequence thresholding of alarm time of crossing the border);
The signal intensity that u (t), u (t-MT), u (t+nT)-receiving end receive at t, (t-MT), (t+nT) respectively constantly;
K
iThe rate of decay thresholding of receiving end signal intensity during the invasion of-target;
K
a-attenuation ratio the thresholding of receiving end signal intensity when crossing the border warning.
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| CN201210162508.2A CN102651158B (en) | 2012-05-18 | 2012-05-18 | Infrared laser correlation light wall type intrusion detector |
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| CN201210162508.2A CN102651158B (en) | 2012-05-18 | 2012-05-18 | Infrared laser correlation light wall type intrusion detector |
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Cited By (4)
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| CN104112325A (en) * | 2014-06-20 | 2014-10-22 | 常州展华机器人有限公司 | Photoelectric alarm device |
| CN104533515A (en) * | 2014-09-10 | 2015-04-22 | 涿州西默勒自动化技术开发有限公司 | Visual automatic prevention and control device for belt conveyor for mine |
| CN109272686A (en) * | 2018-11-02 | 2019-01-25 | 广州市艾礼富电子科技有限公司 | A kind of light beam personal identification method of correlation laser intrusion-detector |
| CN116233570A (en) * | 2022-12-23 | 2023-06-06 | 大连海事大学 | Near infrared band-based smoke-transmitting and fog-transmitting imaging device and method |
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| CN109272686B (en) * | 2018-11-02 | 2024-01-19 | 广州市艾礼富电子科技有限公司 | Beam identity recognition method of correlation laser intrusion detector |
| CN116233570A (en) * | 2022-12-23 | 2023-06-06 | 大连海事大学 | Near infrared band-based smoke-transmitting and fog-transmitting imaging device and method |
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| CN102651158B (en) | 2014-02-26 |
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