CN102236945A - Infrared detection system suitable for field of alarm - Google Patents
Infrared detection system suitable for field of alarm Download PDFInfo
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- CN102236945A CN102236945A CN2011100979259A CN201110097925A CN102236945A CN 102236945 A CN102236945 A CN 102236945A CN 2011100979259 A CN2011100979259 A CN 2011100979259A CN 201110097925 A CN201110097925 A CN 201110097925A CN 102236945 A CN102236945 A CN 102236945A
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Abstract
The invention provides an infrared detection system suitable for the field of alarm. The infrared detection system comprises a signal generating module, an infrared emission module, an infrared receiving module, a receiving amplification module, a signal identification module and an alarm determining module, wherein the signal generating module is used for generating a reference signal; the infrared emission module is used for exciting an infrared light-emitting diode to emit infrared rays by utilizing the reference signal; the infrared receiving module is used for receiving the infrared rays to acquire a target signal by utilizing an infrared reception diode; the receiving amplification module is used for amplifying the target signal; the signal identification module is used for acquiring a series of sampling points, comparing values of the sampling points with a value of the reference signal at the corresponding position, adding one to a base number if the values of the sampling points are equal to the value of the reference signal at the corresponding position, subtracting one from the base number and not processing the base number if the values of the sampling points are not equal to the value of the reference signal at the corresponding position, judging whether the base number reaches a preset threshold value or not, and determining that an object is detected and outputting a determining result when the base number reaches the preset threshold value; and the alarm determining module is used for sending an alarm signal when the object is not detected in a plurality of continuous preset work durations.
Description
[technical field]
The present invention relates to the infrared acquisition field, particularly relate to a kind of integrated level height, infrared detection system that power consumption is little applicable to the warning field.
[background technology]
At present, a lot of active infrared detection equipment are used to the warning field on the market, such as the monitoring of safety cabinet or fixed object or the like.Whether with a kind of existing safety cabinet is example, and its inside is provided with an active infrared detection equipment, can detect the cabinet door of described safety cabinet and open, and sends warning message when the cabinet door is opened by malice.Wherein active infrared detection equipment is a kind of by initiatively sending infrared ray, receives the infrared acquisition equipment that the infrared ray of object reflected back is surveyed then.The shortcoming of tradition active infrared detection equipment is that antijamming capability is very weak, under the situation of detection or working environment variation, be subjected to illumination effect, working environment different temperatures difference etc. such as acquisition environment, the capital causes the situation that described active infrared detection equipment detectivity descends greatly, because the infrared ray that this moment, described active infrared detection equipment received not only comprises the infrared ray that initiatively sends, also comprise extraneous infrared ray.
For traditional active infrared detection equipment, existing a kind of scheme is that the infrared ray to its emission carries out modulation treatment, and then the infrared ray of reflected back is carried out demodulation.So just can strengthen the antijamming capability of described active infrared detection equipment greatly.Described infrared ray is carried out the process of modulation, also can be understood as certain reference signal is carried in described infrared above-the-line promotion, to utilize described reference signal to discern described ultrared process, adopt this scheme can exclude of the interference of extraneous infrared ray to active infrared detection equipment.But this scheme needs the respective coding decoding device to generate described reference signal and the described reference signal of identification.And encoding/decoding device of the prior art is all comparatively complicated, and has the bigger shortcoming of power consumption, is not suitable for the long-term uninterrupted applied environment of surveying.
On the other hand, existing active infrared detection equipment generally includes a plurality of resolution elements, for example comprises audio decoder chip, operational amplifier chip, MCU and power tube or the like.Final small product size is bigger, and integrated level is not high, and is narrow and small or the occasion that integrated level is had relatively high expectations do not possessed favorable applicability for the applied environment of some warning systems.
Therefore being necessary to propose a kind of new technical scheme solves the problems referred to above.
[summary of the invention]
The purpose of this part is to summarize some aspects of embodiments of the invention and briefly introduces some preferred embodiments.In this part and the application's specification digest and denomination of invention, may do a little simplification or omit avoiding the making purpose of this part, specification digest and denomination of invention fuzzy, and this simplification or omit and can not be used to limit the scope of the invention.
The object of the present invention is to provide a kind of infrared detection system that is applicable to the warning field, it has the integrated level height, antijamming capability is strong, with low cost and the power consumption features of smaller.
In order to realize purpose of the present invention, the invention provides a kind of infrared detection system that is applicable to the warning field, it comprises: signal generator module, produce a reference signal, and described reference signal comprises the pulse signal of the fixed duty cycle of predetermined work duration every predetermined free time length; Infrared transmission module utilizes described reference signal excitation infrarede emitting diode to send infrared ray; Infrared receiving module utilizes the infrared receiving diode receiving infrared-ray to obtain echo signal; Receive amplification module, amplify described echo signal; The signal identification module, described echo signal in predetermined work duration of predetermined free time length sampling is to obtain a series of sampled points, the value of the value of more described sampled point and reference signal correspondence position, then radix adds 1 when the value of the value of described sampled point and reference signal correspondence position is identical, otherwise diminished radix or radix is not handled; Judge then whether described radix reaches predetermined threshold, when reaching reservation threshold, the judged result that detects object is judged in the output representative, and when not reaching reservation threshold, the output representative does not detect the judged result of object; The alarm decision module is all sent alerting signal when not detecting object in the judged result of continuous predetermined several predetermined work durations; Or send alerting signal when in the judged result of continuous several predetermined work durations, having several judged results representatives to detect object.
Further, described signal generator module comprises pulse signal generation module and reference signal generation module, and the pulse signal generation module generates the pulse signal of a fixed duty cycle; With the reference signal generation module, every the described pulse signal of predetermined free time length sampling predetermined work duration to generate reference signal.
Further, each predetermined free time length is isometric or not isometric time span, and each predetermined work duration is isometric or not isometric time span.
Further, described reference signal is given birth to module and is comprised square-wave signal generation unit and reference signal generation unit, the square-wave signal that described square-wave signal generation unit is a low frequency with the described pulse signal frequency division of high frequency; With described reference signal generation unit every the described square-wave signal of predetermined free time length sampling predetermined work duration to generate reference signal.
Further, described signal generator module also comprises the sampled signal generation module, described sampled signal generation module generates sampled signal, comprise positive pulse in the described sampled signal, and the positive pulse in the described sampled signal is corresponding to positive pulse in the described reference signal and/or negative pulse, and the positive pulse length in the described sampled signal is less than or equal to positive pulse and/or the negative pulse length in the reference signal.
Further, described signal generator module also comprises judges the signal generation module, described judgement signal generation module generates judges signal, comprise positive pulse in the described judgement signal, positive pulse in the described judgement signal is corresponding to be A+T constantly, described A is the end moment of each predetermined work duration, and described T is more than or equal to a work period and is less than or equal to the length of being scheduled to free time length.
Further, described signal identification module comprises signal sampling module, counting phase-detecting decoder module and decoding judge module, the signal sampling module, obtain sampled point according to the sampled signal described echo signal of sampling, described sampled point comprises odd samples point and even number of samples point successively according to sampling order; Counting phase-detecting decoder module, the value of the value of more described sampled point and reference signal correspondence position, then radix adds 1 when the value of the value of described sampled point and reference signal correspondence position is identical, otherwise diminished radix or radix is not handled; With the decoding judge module, judge whether described radix reaches predetermined threshold, if reach reservation threshold, then judge and detect object; If do not reach reservation threshold, then judge and do not detect object.
Further, described signal sampling module comprises to obtain sampled point according to the sampled signal described echo signal of sampling: when described sampled signal was positive pulse, the described echo signal of then sampling was to obtain sampled point.
Further, described decoding judge module calculates the size of described radix in the moment of described judgement signal positive pulse, if described radix surpasses described predetermined threshold then judges that described echo signal meets the feature of reference signal, otherwise described echo signal does not meet the feature of reference signal; Counting phase-detecting decoder module returns to initial value with radix wherein after judging the signal judgement.
Further, described infrared transmission module connects infrarede emitting diode and is connected infrared receiving diode with described infrared receiving module, described infrarede emitting diode and infrared receiving diode are settled according to the orientation of infrared external reflection, described infrared detection system also comprises alarm module simultaneously, and described alarm module is reported to the police after receiving described alerting signal.
Compared with prior art, the echo signal after infrared detection system provided by the invention is relatively sampled and the value of standard signal correspondence position are upgraded radix, thereby judge and whether detect object, realize simply, and have simple structure, advantage with low cost; Because the time less that described positive pulse is occupied in reference signal when using described reference signal to come the stimulated emission infrared ray, can be saved a lot of energy, described the present invention has the power consumption features of smaller simultaneously simultaneously.And when comprising the pulse signal in a lot of cycles in the described predetermined work duration, has good antijamming capability.In addition, described alarm decision module is to send alerting signal according to the judged result of continuous a plurality of predetermined work durations, has strengthened the antijamming capability and the fault-tolerant ability of alerting signal further.
[description of drawings]
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.Wherein:
Fig. 1 is infrared detection system block diagram in one embodiment among the present invention;
Fig. 2 is the signal generator module block diagram in one embodiment among the present invention;
Fig. 3 A-Fig. 3 D is respectively pulse signal, reference signal, another kind of reference signal and the common echo signal in one embodiment of the present of invention;
Fig. 4 is the waveform synoptic diagram of reference signal, echo signal, high-frequency signal, sampled signal and judgement signal in one embodiment of the present of invention;
Fig. 5 is the block diagram of the reference signal generation module in one embodiment of the present of invention;
Fig. 6 is the block diagram of the signal identification module in one embodiment of the present of invention;
Fig. 7 is the reference signal in one embodiment of the present of invention and the waveform synoptic diagram of echo signal;
Fig. 8 is the structural representation of the infrared detection system in one embodiment of the present of invention.
[embodiment]
Detailed description of the present invention is mainly come the running of direct or indirect simulation technical solution of the present invention by program, step, logical block, process or other symbolistic descriptions.Be the thorough the present invention that understands, in ensuing description, stated a lot of specific detail.And when not having these specific detail, the present invention then may still can realize.Affiliated those of skill in the art use these descriptions herein and state that the others skilled in the art in affiliated field effectively introduce their work essence.In other words, be the purpose of the present invention of avoiding confusion, because the understanding easily of method of knowing and program, so they are not described in detail.
Alleged herein " embodiment " or " embodiment " are meant special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention.Different in this manual local " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or optionally mutually exclusive with other embodiment embodiment.In addition, represent the sequence of modules in method, process flow diagram or the functional block diagram of one or more embodiment and revocablely refer to any particular order, also be not construed as limiting the invention.
The invention provides a kind of infrared detection system that is applicable to the warning field, whether it exists object by judging in the effective coverage, and judges the different drive pattern of length selection of object life period.
Please refer to Fig. 1, it shows infrared detection system block diagram in one embodiment among the present invention.Described infrared detection system 100 comprises signal generator module 110, infrared transmission module 120, infrared receiving module 130, receives amplification module 140, signal identification module 150 and alarm decision module 160.
Described signal generator module 110 produces and is used for modulated infrared reference signal, and described reference signal comprises the pulse signal of the fixed duty cycle of predetermined work duration every predetermined free time length.Also be to comprise plurality of sections idle signal and working signal in the described reference signal, described idle signal and working signal are spaced-apart, comprise the pulse signal in several cycles in the described working signal, comprise positive pulse and negative pulse in the pulse signal of one-period.In one embodiment, described reference signal can be with reference to the reference signal shown in the figure 3B, and described reference signal comprises the square-wave signal of the predetermined work duration of 30ms every the predetermined free time length of 100ms, and the cycle of described square-wave signal is 10ms.
Described infrared transmission module 120 utilizes described reference signal excitation infrarede emitting diode to send infrared ray.Described infrared detection system 100 outsides include signal output terminal (also citing approvingly pin) usually, after connecting infrarede emitting diode by described signal output terminal, utilize described signal output terminal to export described reference signal to encourage described infrarede emitting diode to send to comprise the infrared ray of described broadcast reference signal information.Concrete, described signal output terminal also connects infrarede emitting diode (not specifically illustrating) by adjustable resistance.
Described infrared receiving module 130 utilizes the infrared receiving diode receiving infrared-ray to obtain echo signal.Described infrared receiving diode and described infrarede emitting diode are generally infrared tube, also arrange side by side usually when installation is provided with, to be convenient to receive the infrared signal of object reflected back.Described infrared detection system 100 outsides also include signal input terminal usually, and described infrared receiving diode is not usually by resistance link to each other with described signal input terminal (specifically illustrating).At this moment, described infrared receiving module 130 can utilize the infrared receiving diode receiving infrared-ray to obtain echo signal.
Described reception amplification module 140 amplifies described echo signal.Described reception amplification module 140 can be in field effect transistor, operational amplifier or the multistage amplifier circuit a kind of.Be used for will be described echo signal be transferred to described signal identification module 150 after amplifying output because the content that signal amplification technique is well known to those skilled in the art, can some different implementations, be not repeated at this.
Generally, when described reference signal is used in the active infrared detection device when modulated infrared, described infrared ray is reflected by object, after receiving back active infrared detection device and amplification, because certain decay can take place, phase shift and disturbed, such as the disturbing factor of circuit devcie, the concrete echo signal that receives is signal D as shown in Figure 3, that suppose described reference signal employing here is the signal A shown in Fig. 3, and in order to illustrate conveniently, positive pulse in the described predetermined work duration has only 3, but in specific embodiment, the interior positive pulse of predetermined work duration has tens usually, more than hundreds of is individual.Can as far as possible accurately sample in order to count the phase-detecting coding/decoding method, the coding method of described counting phase-detecting also comprises the generation sampled signal.Described sampled signal can help to count the phase-detecting decoding device and extract from echo signal and try one's best effective sampled point and reduce decay and disturb influence to sampled result.
The described echo signal of described signal identification module 150 in predetermined work duration of predetermined free time length sampling is to obtain a series of sampled points, the value of the value of more described sampled point and reference signal correspondence position, value when described sampled point, then radix adds 1 when the value of the value of described sampled point and reference signal correspondence position is identical, otherwise diminished radix or radix is not handled; Judge that then whether described radix surpasses predetermined threshold, when described radix surpasses predetermined threshold, judges and detects object and export judged result.
Because the value of more described sampled point and value and reference signal correspondence position is upgraded radix, if described echo signal is the reflected signal of described reference signal, be that described reference signal is returned the formation echo signal after running into object, relatively the point that described echo signal is sampled and the value of described reference signal correspondence position are equal, accumulative total through several cycles, described radix constantly adds 1, when described radix surpassed predetermined threshold, promptly the described infrared detection system 100 of decidable had detected object.
Will be appreciated that, on the one hand, the reference signal that described infrared detection system 100 produces not is continuous signal, but intermittent signal, because the power consumption in the active infrared detection device is mainly launched infrared ray and caused, the power consumption of chip is very little comparatively speaking on the contrary.Whenever reference signal will be launched stronger infrared ray during for positive pulse and can be caused bigger power consumption, if the positive pulse in the described reference signal is less, will reduce power consumption so, the mode of one section pulse signal of one section free time length emission can obtain lower power consumption so adopt at interval.But the free time length in the described reference signal also is not suitable for oversize, in order to avoid the infrared ray of launching in the unit interval very little, and the sensation that the reaction velocity that causes using the active infrared detection device of described infrared detection system is given user " blunt ", common described free time length can be got 100ms-300ms, and predetermined free time length can be other values described in the different certainly embodiment.On the other hand, in actual applications, the pulse signal in several cycles that comprise in the described predetermined work duration is meant tens or hundreds of, be as the criterion so that described radix can run up to enough big value, only comprise three or several pulse in the diagram in one section pulse signal and just understand for the ease of drawing and being convenient to.
Again on the one hand, when whether described infrared detection system 100 recognition objective signals are the reflected signal of reference signal, be relatively discerning according to the value of correspondence position in value that obtains after echo signal is sampled and the reference signal.Certainly for the reference signal that comprises a lot of positive pulses and negative pulse, be not strict with that positive pulse and negative pulse all are to occur in pairs in every section predetermined work duration, this point should not become the reason of restriction protection scope of the present invention.Because comprising in predetermined work duration that the pulse signal in several cycles is meant tens or hundreds of even if distortion and distortion to a certain degree taken place in the echo signal, can not cause big influence to final judged result yet.Again because the alarm decision module is to produce alerting signal according to a plurality of judged results, so described infrared detection system 100 has very strong antijamming capability and false alarm prevention capability.
Various aspects of the present invention for convenience of description, hereinafter will to each module of described infrared detection system 100 in other words various aspects describe in detail.
Please refer to Fig. 2, it shows signal generator module 110 block diagram in one embodiment among the present invention.Described signal generator module 110 comprises pulse signal generation module 112, reference signal generation module 114 and sampled signal generation module 116.Wherein reference signal one is to be used to encourage infrared emission, the 2nd, be used for signal identification module 150 sampling after the comparison of echo signal value, described sampled signal is used to help 150 pairs of echo signals of described signal identification module to sample.
Described pulse signal generation module 112 generates the pulse signal of a fixed duty cycle.In a preferred embodiment, the pulse signal of described fixed duty cycle is a square-wave signal.The generation of described square wave has a variety of methods, such as utilizing a voltage comparator that sine wave is become square wave, adds shaping circuit with the output square wave again or in an active crystal oscillator inside, can also utilize loop oscillator to produce or the like.In specific embodiment, what described pulse signal generation module 112 can be that loop oscillator directly produces is high-frequency signal, and the waveform of described high-frequency signal can be with reference among the figure 4 shown in the waveform C.Certainly, the method that is used to produce the pulse signal of fixed duty cycle in the prior art can adopt, for convenience of description, select for use square wave to describe the present invention as preferred embodiment herein, the embodiment that adopts the pulse signal of other fixed duty cycles is that the easy full of beard of those skilled in the art reaches.The waveform synoptic diagram of described square wave can be with reference to shown in the figure 3A.
Described reference signal generation module 114 comprises square-wave signal generation unit 502 and reference signal generation unit 504.Described square-wave signal generation unit 502 is used for described high-frequency signal frequency division is produced square-wave signal, described reference signal generation unit 504 every the described square-wave signal of predetermined free time length sampling predetermined work duration to generate reference signal.Also be to comprise plurality of sections idle signal and working signal in the described reference signal, described idle signal and working signal are spaced-apart, comprise the pulse signal in several cycles in the described working signal, comprise positive pulse and negative pulse in the pulse signal of one-period.Will be appreciated that, the concrete form of described reference signal can freely be set, that is to say, each predetermined free time length at interval can be isometric or not isometric time span in the described reference signal, each predetermined work duration at interval also can be isometric or not isometric time span, but in a preferred embodiment, described predetermined free time length is more than or equal to described predetermined work duration.For example, in one embodiment, what described pulse signal generation module 112 generated is that constant period is the square wave of 10ms, described reference signal generation module 114 every the square-wave signal of the work duration of the free time length sampling 30ms of 100ms to generate reference signal, shown in Fig. 3 B.In another embodiment, what described pulse signal generation module 112 generated is that constant period is the square wave of 8ms, described reference signal generation module 114 is behind the square-wave signal of the work duration of the free time length of 100ms sampling 40ms, every sample the again square-wave signal of work duration of 24ms of the free time length of 200ms; Then again behind the square-wave signal of the work duration of the free time length of 100ms sampling 40ms, sample the square-wave signal of work duration of 24ms again to form reference signal, shown in Fig. 3 C every the free time length of 200ms.
It is modulated infrared to be used for the active infrared detection device after described reference signal is produced, after described infrared ray is reflected by object and receives back the active infrared detection device, certain decay, phase shift and disturbed will take place, such as the disturbing factor of circuit devcie, the concrete echo signal that receives is signal B as shown in Figure 4, (that suppose described reference signal employing herein is the A of signal shown in Fig. 4, and the A of signal described in Fig. 4 is the interior waveform signal of a predetermined work duration of reference signal shown in Fig. 3 B).
For the described echo signal of can as far as possible accurately sampling.Described sampled signal generation module 116 is used to generate sampled signal, and described sampled signal can help described signal identification module 150 to extract from echo signal to try one's best effective sampled point and reduce decay and disturb influence to sampled result.In one embodiment, described sampled signal generation module 116 generates sampled signal according to described high-frequency signal, and the positive pulse in the described sampled signal is corresponding to positive pulse in the described reference signal and/or negative pulse.Because cycle of described high-frequency signal is 1/2nd, 1/4th, 1/8th or ten sixths etc. in the cycle of described square-wave signal, so the positive pulse length of described sampled signal also is 1/2nd, 1/4th, 1/8th or ten sixths of the interior positive pulse length of described reference signal etc.Such as in one embodiment, described pulse signal is the square-wave signal that described pulse signal generation module 112 generates, the frequency of described high-frequency signal be square-wave signal frequency 1/8th, signal C as shown in Figure 4, and described sampled signal generates according to described high-frequency signal, each positive pulse in the described sampled signal is all corresponding with positive pulse and negative pulse in the described reference signal, as shown in Figure 4 signal D.
Usually contrast between reference signal and the echo signal in order to realize, described signal generator module 110 can also comprise one and produce judgement signal judgment signal generation module 118, signal E as shown in Figure 4, each positive pulse of described judgement signal is all constantly corresponding with the end of predetermined work duration, still should be before the predetermined work duration arrives next time after can leaning on slightly, the moment such as described judgement signal belongs to interval (A, A+T), described A is the end moment of each predetermined work duration, and described T is more than or equal to a work period and is less than or equal to the length of being scheduled to free time length.。
Please continue with reference to figure 6, it shows the block diagram of the signal identification module 150 in one embodiment of the present of invention.Described signal identification module 150 comprises signal sampling module 152, counting phase-detecting decoder module 154 and decoding judge module 156.
Described signal sampling module 152 is sampled described echo signal to obtain sampled point according to sampled signal, particularly, described signal sampling module 152 is when described sampled signal is positive pulse, the described echo signal of sampling is to obtain a series of sampled point, and described sampled point comprises odd samples point and even number of samples point successively according to sampling order.Owing to comprise positive pulse in the described sampled signal, and the positive pulse in the described sampled signal is corresponding to positive pulse in the described reference signal and/or negative pulse.In a series of sampled point that obtain this moment, odd samples point is just corresponding to the positive pulse in the reference signal, and even number of samples point is just corresponding to the negative pulse in the reference signal.
The value of described counting phase-detecting decoder module 154 more described sampled points and the value of reference signal correspondence position, then radix adds 1 when the value of the value of described sampled point and reference signal correspondence position is identical, otherwise diminished radix or radix is not handled.
In actual applications, because reference signal is known, so the value of the arbitrfary point on the reference signal all can be decided the value of the point that it can be in advance obtains according to the sampled point moment corresponding.
Certainly, utilize sampled signal simultaneously reference signal and echo signal to be sampled and also be fine, different with said method is, the correspondence position of reference signal is carried out real-time sampling to obtain the value of sampling location.In fact, the value of said reference signal correspondence position also obtains by described sampled signal in advance, can directly compare with the value that echo signal is sampled in application.
Generally, judge that radix subtracts 1 or do not handle and will decide as the case may be.As being kept to negative for fear of radix, described radix is typically provided to the number more than or equal to 0, the value of the value of more described sampled point and reference signal correspondence position subsequently, then do not carry out processing when different and radix is 0 when the value of the value of described sampled point and reference signal correspondence position to radix, when the value of the value of described sampled point and reference signal correspondence position not simultaneously and radix diminished radix then when being not 0, otherwise radix adds 1.
In one embodiment, see also shown in Figure 7ly, Fig. 7 is the comparison diagram of echo signal among the present invention and reference signal.Wherein A is a reference signal, and the positive pulse of described reference signal is designated as 1, and negative pulse is designated as 0, and a series of values that then obtain are 10101010101010101010, and signal B here and signal C are echo signal.The initial value that makes radix is 0, and all selecting the position at back 1/4th places of each pulse of echo signal for use is sampled point.According to above-mentioned counting phase-detecting algorithm at first benchmark signal A and echo signal B, at first, the value of sampled signal at back 1/4th places of first pulse of echo signal B is 1, the value of reference signal A at back 1/4th places of first pulse of correspondence also is 1, then radix adds 1, continue the value of a follow-up sampled point, second value of reference signal A and second sampled point of echo signal B be 0, then radix adds 1.And the like, after the contrast situation of the value of all sampled points, radix is 18 in finishing figure, wherein the identical situation of value of correspondence position has 19 times among the value of sampled point and the reference signal A, and different 1 time, so the radix that obtains at last is 18.The value of correspondence position among the value of each sampled point of comparison object signal C and the reference signal A, the identical situation that obtains has 14 times, and has different situations 6 times, and upgrading the radix size that the rule of radix obtains at last according to above-mentioned counting phase-detecting is 8.
Certainly, described radix also can not be initialized as 0, and as being initialized as N, wherein N＞0 when echo signal meets the feature of reference signal, is 400 as if the total number of sample points in this section period, and then last radix trends towards 400+N; If echo signal is not when meeting the feature of reference signal, when radix is reduced to N, just no longer subtract 1 processing, so last radix generally can trend towards N, can certainly reduce at 0 o'clock at radix and no longer subtract 1 processing.
Described decoding judge module 156 judges whether described radix reaches predetermined threshold, if reach reservation threshold, judges that then described echo signal meets the feature of reference signal; If do not reach reservation threshold, judge that then described echo signal does not meet the feature of reference signal.
On the theory,, show that then two groups of positive pulse and/or order and numbers of negative pulse in the signal should be very approximate if echo signal meets the feature of reference signal.So, when the number of the pulse of this section in the time is 400, might as well establish described threshold value and be 240 or 260 etc., like this as long as last radix greater than described threshold value, the pulse signal of then representing described pulse signal that receives and transmission is same pulse signal.Certainly if echo signal does not meet the feature of reference signal, show that then two groups of positive pulse and order and number difference of negative pulse in the signal are very big, the high-low level that is identical moment pulse many times is different, so its last radix may trend towards 0 or for negative.Limit for fear of the requirement of negative, generally will avoid producing the situation that radix is a negative its radix scope.Therefore in one embodiment, be kept in 0 at radix, in order to prevent the situation of negative, if this moment, the target pulse of sampling was different with the value of basic pulse correspondence position, then radix is not handled, then radix adds 1 when the target pulse of sampling is identical with the value of basic pulse correspondence position, diminished radix when producing different values again, and the radix value that relatively produces of last like this two groups of different pulse signals trends towards 0.
In one embodiment, quote shown in Figure 7 equally, the number of the pulse of comparing as required can be set to 15 by its predetermined threshold, as from the foregoing, the radix that obtains after the value that obtains after the comparison object signal B sampling and the value of reference signal A correspondence position is 18, it shows then that greater than predetermined threshold 15 described echo signal B meets the feature of reference signal A; And the radix that obtains after the value of value that obtains after the comparison object signal C sampling and reference signal A correspondence position is 8, and it shows then that less than predetermined threshold 15 described echo signal B does not meet the feature of reference signal A.
In actual applications, when the echo signal that sampling is obtained and reference signal compare, carrying out the judgement of radix and predetermined threshold size after all ratio of pulse length to the total cycle length in the predetermined work duration of corresponding echo signal and reference signal can being finished again, also can be to compare radix and predetermined threshold size in the process of sampling in real time.When being 400 as the sampled point of echo signal when sampling, predetermined threshold is 360, and the radix that produces when relatively to the 370th sampled point is when being 360, then no longer carries out 30 pulses in back comparison of sampling, thereby can save time, and reduces power consumption.
More specifically, with after all ratio of pulse length to the total cycle length are finished in corresponding echo signal and the reference signal when carrying out the judgement of radix and predetermined threshold size, can utilize the judgement signal to judge that this predetermined work duration finishes, mean and can radix and the predetermined threshold size that obtain have been compared this moment.
Generate the judgement signal according to the above-mentioned sampled signal that obtains, comprise positive pulse in the described judgement signal, positive pulse in the described judgement signal is corresponding to be A+T constantly, described A is the end moment of each predetermined work duration, and described T is more than or equal to a work period and is less than or equal to the length of being scheduled to free time length.Promptly finish the judgement signal that produces a positive pulse that time of back one-period,,, then immediately the cardinal sum predetermined threshold is compared if receive the judgement signal referring to the judgement signal among Fig. 3 at each work duration.Obviously, when T is greater than a work period and is less than or equal to the length of predetermined free time length, all can produce the judgement signal in during before then that of the one-period after each work duration finishes begins to next work duration constantly, as can be when the predetermined work duration finishes or other the positive pulses of cycle moment corresponding generation judgement signal such as the 2nd, 3,4 or 5 that finish of predetermined work duration.
And if when carrying out in real time relatively, then can not need to utilize and judge signal, and, just this radix and predetermined threshold be compared to judge whether echo signal meets the feature of reference signal to radix of every generation to the cardinal sum predetermined threshold.
What it may be noted that a bit is: the above-mentioned situation that compares radix and predetermined threshold size in the process of sampling in real time, because its predetermined threshold can be set according to the pulse sum of echo signal or reference signal, so the result of this mode comparison can not have influence on its degree of accuracy.
Usually, when utilizing the judgement signal to judge, can judge that signal revert to initial value with radix after having judged; And under situation about comparing in real time, when judging radix, then calculating is reverted to initial value, otherwise after this work duration finishes, radix is reverted to initial value greater than predetermined threshold.
In specific embodiment, described infrared detection system 100 can be passed through four common joint AAA dry cell power supplies, and can continue to use 2 years, can certainly select the residential electricity consumption transformation is converted to DC power supply.Simultaneously, described infrared detection system 100 with most of parts all integrated with chip piece within, integrated level is higher to be caused installing and using very simple, and it is less to take up room, in the narrow and small occasion of the applied environment such as the infrared induction urinal, can obtain good effect.
Please refer to Fig. 8, it shows the structural representation of the infrared detection system 100 in one embodiment of the present of invention.Described infrared detection system 100 comprises 10 terminals (or citing approvingly pin) of chip piece and chip exterior: a1 terminal, a2 terminal, a3 terminal, a4 terminal, b1 terminal, b2 terminal, b3 terminal, b4 terminal, VCC terminal and GND terminal.
Described a1 terminal and a2 terminal are signal output terminal, can link to each other with infrarede emitting diode by controllable resistor; Described b1 terminal is a signal input terminal, can link to each other with infrared receiving diode by controllable resistor; Described b3 terminal and b4 terminal are the drive signal lead-out terminal, can connect the warning device of motor valve or dryer and so on; Described a2 terminal and a3 terminal are the function selecting terminal, are receiving (high level, low level), (low level, low level), the different drive signal generation pattern of (high level, high level) or (low level, high level) back selection; Described a4 terminal can connect pilot lamp.Described infrared detection system 100 can built-in four kinds of different drive signals produce pattern.Obviously, described infrared detection system 100 integrated levels are higher, only need enforcement just can be installed, and select different functions, have extraordinary ease for use and applicability according to concrete enforcement environment in conjunction with devices such as infrared tube, seldom several resistance or electric capacity.
In specific embodiment, described infrared detection system 100 can also comprise for example alarm module of hummer and so on that is used to report to the police simultaneously, and described alarm module receives described alerting signal and reports to the police.Wherein infrared tube can be settled according to the orientation of infrared external reflection or infrared correlation, and when obviously adopting infrared correlation to install, the determination strategy when determination strategy is installed with the employing infrared external reflection is just in time opposite, and this paper is not repeated.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that and be familiar with the scope that any change that the person skilled in art does the specific embodiment of the present invention does not all break away from claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to described embodiment.
Claims (10)
1. infrared detection system that is applicable to the warning field is characterized in that it comprises:
Signal generator module produces a reference signal, and described reference signal comprises the pulse signal of the fixed duty cycle of predetermined work duration every predetermined free time length;
Infrared transmission module utilizes described reference signal excitation infrarede emitting diode to send infrared ray;
Infrared receiving module utilizes the infrared receiving diode receiving infrared-ray to obtain echo signal;
Receive amplification module, amplify described echo signal;
The signal identification module, described echo signal in predetermined work duration of predetermined free time length sampling is to obtain a series of sampled points, the value of the value of more described sampled point and reference signal correspondence position, then radix adds 1 when the value of the value of described sampled point and reference signal correspondence position is identical, otherwise diminished radix or radix is not handled; Judge then whether described radix reaches predetermined threshold, when reaching reservation threshold, the judged result that detects object is judged in the output representative, and when not reaching reservation threshold, the output representative does not detect the judged result of object;
The alarm decision module is all sent alerting signal when not detecting object in the judged result of continuous predetermined several predetermined work durations; Or send alerting signal when in the judged result of continuous several predetermined work durations, having several judged results representatives to detect object.
2. infrared detection system according to claim 1 is characterized in that: described signal generator module comprises pulse signal generation module and reference signal generation module,
The pulse signal generation module generates the pulse signal of a fixed duty cycle; With
The reference signal generation module, every the described pulse signal of predetermined free time length sampling predetermined work duration to generate reference signal.
3. infrared detection system according to claim 2 is characterized in that: each predetermined free time length is isometric or not isometric time span, and each predetermined work duration is isometric or not isometric time span.
4. infrared detection system according to claim 3 is characterized in that: described reference signal is given birth to module and is comprised square-wave signal generation unit and reference signal generation unit,
The square-wave signal that described square-wave signal generation unit is a low frequency with the described pulse signal frequency division of high frequency; With
Described reference signal generation unit every the described square-wave signal of predetermined free time length sampling predetermined work duration to generate reference signal.
5. infrared detection system according to claim 3, it is characterized in that: described signal generator module also comprises the sampled signal generation module, described sampled signal generation module generates sampled signal, comprise positive pulse in the described sampled signal, and the positive pulse in the described sampled signal is corresponding to positive pulse in the described reference signal and/or negative pulse, and the positive pulse length in the described sampled signal is less than or equal to positive pulse and/or the negative pulse length in the reference signal.
6. infrared detection system according to claim 5, it is characterized in that: described signal generator module also comprises judges the signal generation module, described judgement signal generation module generates judges signal, comprise positive pulse in the described judgement signal, positive pulse in the described judgement signal is corresponding to be A+T constantly, described A is the end moment of each predetermined work duration, and described T is more than or equal to a work period and is less than or equal to the length of being scheduled to free time length.
7. according to each described infrared detection system of claim 1 to 6, it is characterized in that: described signal identification module comprises signal sampling module, counting phase-detecting decoder module and decoding judge module,
The signal sampling module obtains sampled point according to the sampled signal described echo signal of sampling, and described sampled point comprises odd samples point and even number of samples point successively according to sampling order;
Counting phase-detecting decoder module, the value of the value of more described sampled point and reference signal correspondence position, then radix adds 1 when the value of the value of described sampled point and reference signal correspondence position is identical, otherwise diminished radix or radix is not handled; With
The decoding judge module judges whether described radix reaches predetermined threshold, if reach reservation threshold, then judges and detects object; If do not reach reservation threshold, then judge and do not detect object.
8. infrared detection system according to claim 7 is characterized in that: described signal sampling module comprises to obtain sampled point according to the sampled signal described echo signal of sampling:
When described sampled signal was positive pulse, the described echo signal of then sampling was to obtain sampled point.
9. infrared detection system according to claim 7, it is characterized in that: described decoding judge module calculates the size of described radix in the moment of described judgement signal positive pulse, if described radix surpasses described predetermined threshold then judges that described echo signal meets the feature of reference signal, otherwise described echo signal does not meet the feature of reference signal; Counting phase-detecting decoder module returns to initial value with radix wherein after judging the signal judgement.
10. infrared detection system according to claim 1, it is characterized in that: described infrared transmission module connects infrarede emitting diode and is connected infrared receiving diode with described infrared receiving module, described infrarede emitting diode and infrared receiving diode are settled according to the orientation of infrared external reflection
Described infrared detection system also comprises alarm module simultaneously, and described alarm module is reported to the police after receiving described alerting signal.
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| CN 201110097925 CN102236945B (en) | 2011-04-19 | 2011-04-19 | Infrared detection system suitable for field of alarm |
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| CN 201110097925 CN102236945B (en) | 2011-04-19 | 2011-04-19 | Infrared detection system suitable for field of alarm |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107830882A (en) * | 2017-10-23 | 2018-03-23 | 中国联合网络通信集团有限公司 | Alarm method and device based on ultrasonic wave |
| CN107918991A (en) * | 2017-10-17 | 2018-04-17 | 国网山东省电力公司青岛供电公司 | A kind of warning device |
| CN115453648A (en) * | 2022-08-08 | 2022-12-09 | 宁波奥克斯电气股份有限公司 | Infrared detection method and device and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08139583A (en) * | 1994-11-04 | 1996-05-31 | Yamatake Honeywell Co Ltd | Touch key |
| JP2005337955A (en) * | 2004-05-28 | 2005-12-08 | Toto Ltd | Object detector |
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- 2011-04-19 CN CN 201110097925 patent/CN102236945B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08139583A (en) * | 1994-11-04 | 1996-05-31 | Yamatake Honeywell Co Ltd | Touch key |
| JP2005337955A (en) * | 2004-05-28 | 2005-12-08 | Toto Ltd | Object detector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918991A (en) * | 2017-10-17 | 2018-04-17 | 国网山东省电力公司青岛供电公司 | A kind of warning device |
| CN107830882A (en) * | 2017-10-23 | 2018-03-23 | 中国联合网络通信集团有限公司 | Alarm method and device based on ultrasonic wave |
| CN115453648A (en) * | 2022-08-08 | 2022-12-09 | 宁波奥克斯电气股份有限公司 | Infrared detection method and device and air conditioner |
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| CN102236945B (en) | 2013-02-27 |
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