CN102183795A - Target detection system and method based on dynamic utilization of pyroelectric infrared sensor - Google Patents
Target detection system and method based on dynamic utilization of pyroelectric infrared sensor Download PDFInfo
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Abstract
The invention discloses a target detection system and method based on dynamic utilization of a pyroelectric infrared sensor. The target detection system comprises a pyroelectric infrared sensor, a main controller connected with the pyroelectric infrared sensor, and an infrared collecting hardware processing unite respectively connected with the pyroelectric infrared sensor and the main controller. The target detection system also comprises a rotary table module and a signal processing module, wherein the rotary table module is arranged on the lower end of the pyroelectric infrared sensor, and is matched with the pyroelectric infrared sensor, and the signal processing module is arranged in the main controller. The target detection system and method based on the dynamic utilization of the pyroelectric infrared sensor in the invention can be used for realizing the detection of target signals by virtue of a larger vision angle and a positive working mode, and have high detection sensitivity and better application prospect in the detection field of the target signals.
Description
Technical field
The present invention relates to a kind of system and method that uses pyroelectric infrared sensor to carry out target detection, especially relate to a kind of based on target detection system and the method thereof of dynamically using pyroelectric infrared sensor down.
Background technology
Infrared radiation is very general at occurring in nature, any object is as long as its temperature is higher than absolute zero (273 ℃), just have infrared ray space radiation towards periphery, because the different objects material character has nothing in common with each other, they are also different to extraradial infrared radiation: the body surface temperature is high more, and the energy of its radiation is just strong more.Pyroelectric infrared sensor mainly is the material by a kind of high Seebeck coefficient, the detecting element of making as lead zirconate titanate, lithium tantalate, triglycine sulfate etc., these detecting elements are when temperature variation, structural charge-site relative displacement can appear, their spontaneous polarization strength is changed, thereby produce the bound charge of contrary sign at their two ends; And two detecting elements of in each detector, packing into, and two detecting elements are connected with reversed polarity, with the interference that suppresses to produce owing to the ambient temperature drift, the infrared radiation that to be surveyed and receive by detecting element is transformed into faint voltage signal, outwards output after the field effect transistor in being contained in probe is amplified.
Pyroelectric infrared sensor belongs to the passive-type infrared sensor, and following characteristics are arranged: (1) is not because far infrared is influenced by visible light, so continuous monitoring day and night; (2) because measurand self emission infrared ray so can establish light source in addition, can not produce the radiation of any kind; (3) atmosphere is very few to some specific wavelength (as 8-14 μ m) infrared ray absorbing, so more easily detect; (4) this class sensor production is with low cost, and power consumption is little, and therefore good concealment is widely used in the target detection field.
But pyroelectric infrared sensor is subjected to the restriction of itself attribute to cause also having the existence of many problems: it is very short that pyroelectric infrared sensor detects distance, so when using pyroelectric infrared sensor, need add that certain optical devices improve its detection range in its front, the major function of optical devices is to collect the infrared energy of measured target emission, and then they is converged on the photosurface of infrared eye.Optical devices have determined the visual field size of pyroelectric infrared sensor, the visual field of pyroelectric infrared sensor with it another important performance characteristic---distance coefficient is directly related, distance coefficient and the field angle relation of being inversely proportional to, so what its field angle will become when using pyroelectric infrared sensor to carry out long-range target acquisition is very little, if the target that we will survey in the long-distance large-range will be used a plurality of pyroelectric infrared sensors.
Common optical devices are Fresnel Lenses on the market now, its detection range can reach 40 meters farthest, but its field angle only is 8 degree in the time of 40 meters, if we want the target in the 360 degree scopes of surveying, will use 45 pyroelectric infrared sensors and Fresnel Lenses, this just causes very big difficulty to the Machine Design and the circuit design of device, and has strengthened the volume and the cost of detection system.
In addition, pyroelectric infrared sensor can only carry out passive type work, can not survey stationary object, and signal amplitude is little, be subjected to various thermals source easily, interference of light sources, when environment temperature and human body temperature near the time, detection sensitivity obviously descends, sometimes also can cause malfunctioning in short-term, and its direction of motion that mainly detects is the transverse movement direction, and poor to the object detection ability of radially direction motion, these shortcomings have limited the usable range of pyroelectric infrared sensor greatly.
The most frequently used pyroelectric infrared sensor is the double base pyroelectric infrared sensor now, the double base pyroelectric infrared sensor is meant that pyroelectric infrared transducer comprises the pyroelectricity element of two mutual serial or parallel connections, and two electrode direction making are just in time opposite, ambient background radiation almost has identical effect to two pyroelectricity elements, the pyroelectric effect of its generation is cancelled out each other, so the output of sensor no signal.Promptly only when temperature has the variation of Δ T in the sensor monitors scope, pyroelectric effect just can produce electric charge Δ Q on two electrodes, produce a weak voltage Δ V between two electrodes, when environment temperature is stablized when constant Δ T=0, sensor no-output.
As the patent No. is that the utility model patent of ZL 200720006151.3 discloses a kind of pair of Thermoelectric Infrared Sensor difference output passive infrared dual technology detector, and its technical solution is: form difference with two Thermoelectric Infrared Sensor and export.It is characterized in that under the Fresnel Lenses of detector, two Thermoelectric Infrared Sensor distribute up and down, opposite about the top view of sensor, the relevant position of the corresponding Fresnel Lenses separately of difference, its external overall viewing angle is almost completely identical, export under the effect of Fresnel Lenses when human body is moved and form difference mode signal, the variation of ambient temperature forms common mode noise signal, forms difference output at the back of two sensors access differential amplifier.
The defective that such scheme exists is: this detector can not dynamically use down, in case doing relative motion because detector moves the environment that just means in its sensing range, all objects in the environment all become to have temperature variation like this, the capital causes the pyroelectricity output signal, and its testing result will be wrong; In addition, its direction of motion that mainly detects is the transverse movement direction, and poor to the object detection ability of radially direction motion, these shortcomings have limited its usable range greatly.
Summary of the invention
Purpose of the present invention overcomes deficiency of the prior art exactly, provide that a kind of field of view angle is big, detection sensitivity is high, both can carry out active work also can carry out passive type work based on target detection system and the method thereof of dynamically using pyroelectric infrared sensor down.
For solving the problems of the prior art, the present invention is based on dynamically uses the target detection system of pyroelectric infrared sensor to adopt following scheme down: comprise pyroelectric infrared sensor, the master controller that is connected with described pyroelectric infrared sensor, the infrared acquisition hardware processing unit that is connected with described master controller with described pyroelectric infrared sensor respectively, also comprise lower end that is arranged on described pyroelectric infrared sensor and the turntable module that matches with it, be arranged on the signal processing module in the described master controller, described turntable module also is connected with described master controller.
Further, described infrared acquisition hardware processing unit comprises Hi-pass filter, signal amplifier, low-pass filter and A/D converter successively, described Hi-pass filter is connected with described pyroelectric infrared sensor, and described A/D converter is connected with described master controller.
Further, described pyroelectric infrared sensor comprises double base pyroelectric infrared-sensing body and is arranged on the Fresnel Lenses of described double base pyroelectric infrared-sensing body front.
Further, described master controller also is connected with alarm unit.
A kind of based on the detection method that dynamically uses the target detection system of pyroelectric infrared sensor down, comprise the steps:
1) reference position at zero point of pyroelectric infrared sensor is set;
2) pyroelectric infrared sensor is gathered the background initialize signal;
3) infrared acquisition hardware processing unit is to step 2) in the background initialize signal gathered carry out hardware handles;
4) the background initialize signal the signal processing module extraction step 3 in the master controller) after hardware handles, and rendering context initialize signal waveform;
5) master controller sends beginning rotate instruction and rotational angle instruction to turntable module;
6) turntable module drives the angle that pyroelectric infrared sensor begins to rotate and rotate regulation according to the instruction in the step 6);
7) pyroelectric infrared sensor carries out the detection signal collection;
8) infrared acquisition hardware processing unit carries out hardware handles to the detection signal of gathering in the step 7);
9) detection signal the signal processing module extraction step 8 in the master controller) after hardware handles is drawn detection signal waveform;
10) signal processing module adopts the frame-to-frame differences point-score that the detection signal waveform in the step 9) is carried out corresponding volt value subtraction calculations with background initialize signal waveform in the step 4), obtains lying prostrate the value difference value;
11) judge whether volt value difference value surpasses preset threshold, if then judge target, execution in step 12 to occur), otherwise target, repeated execution of steps 5 do not appear in judgement) to step 11);
12) extract echo signal, alarm unit carries out alarm.
In the said method, described step 8) comprises step by step following:
8.1) Hi-pass filter carries out high-pass filtering to detection signal and float to eliminate temperature;
8.2) signal amplifier is to through step by step 8.1) and in detection signal after the high-pass filtering carry out signal and amplify;
8.3) low-pass filter is to step by step 8.2) and in detection signal after amplifying carry out low-pass filtering with further elimination noise signal;
8.4) A/D converter will be through step by step 8.3) and in detection signal after the low-pass filtering carry out the A/D conversion.
Possess the target detection system and the method thereof of dynamically using pyroelectric infrared sensor down that the present invention is based on of said structure and step, possess following advantage:
1) big, the saving cost of field of view angle: the setting of turntable module has enlarged the field of view angle of pyroelectric infrared sensor greatly, for example, if driving pyroelectric infrared sensor, turntable module keeps certain speed uniform rotation, a pyroelectric infrared sensor just can be surveyed the target in 360 ° of scopes, improved the Target Detection Ability of Infrared of moving, provided cost savings greatly radially;
2) can carry out initiatively or passive working method: the setting of turntable module makes the active working method under having increased dynamically on the basis of the passive working method that pyroelectric infrared sensor can be under static state;
3) detection sensitivity: the setting of infrared acquisition hardware processing unit, the temperature that the factors such as environment apoplexy and sunlight that filter by Hi-pass filter cause is floated, can further eliminate noise signal by low-pass filter, can isolate out DC component in the signal by signal amplifier, and provide a constant bias voltage to it, only the AC signal that we are needed is amplified, and adopts these measures to improve the detection sensitivity of system to echo signal greatly.
In sum, the present invention is based on target detection system and the method thereof of dynamically using pyroelectric infrared sensor down, can realize detection to echo signal with bigger field angle and active working method, the detection sensitivity height has reasonable application prospect in the field of detecting of echo signal.
Description of drawings
Fig. 1 the present invention is based on the structural representation block diagram that dynamically uses the target detection system embodiment of pyroelectric infrared sensor down;
Fig. 2 is the structural representation block diagram of infrared acquisition hardware processing unit among Fig. 1;
Fig. 3 is the process flow diagram that the present invention is based on the detection method of the target detection system of dynamically using pyroelectric infrared sensor down.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention is based on the target detection system of dynamically using pyroelectric infrared sensor down, comprise pyroelectric infrared sensor 1, master controller 2, infrared acquisition hardware processing unit 3, turntable module 4 and alarm unit 5 and be arranged on signal processing module 21 in the master controller 2, wherein, pyroelectric infrared sensor 1 respectively with master controller 2, infrared acquisition hardware processing unit 3 is connected, master controller 2 also with infrared acquisition hardware processing unit 3, turntable module 4 is connected respectively with alarm unit 5, and turntable module 4 is arranged on the lower end of pyroelectric infrared sensor 1 and matches with pyroelectric infrared sensor 1.
As shown in Figure 1, in the present embodiment, described pyroelectric infrared sensor 1 comprises double base pyroelectric infrared-sensing body 12 and is arranged on the Fresnel Lenses 11 of double base pyroelectric infrared-sensing body 12 fronts.
As shown in Figure 2, in the present embodiment, described infrared acquisition hardware processing unit 3 is made of mimic channel and digital circuit two parts: artificial circuit part comprises Hi-pass filter 31, signal amplifier 32, low-pass filter 33; Digital circuit partly comprises A/D converter 34.Wherein, Hi-pass filter 31 external pyroelectric infrared sensors 1, A/D converter 34 external master controllers 2.
In the present embodiment, described pyroelectric infrared sensor 1 is provided with Fresnel Lenses 11, and the infrared ray that human body radiation is gone out gathers on the double base pyroelectric infrared-sensing body 12 on the one hand, thereby strengthens the distance of surveying; Also the infrared ray of incident can be done periodic blocking on the other hand, make pyroelectric infrared sensor 1 can export continuous signal.
In the present embodiment, described Hi-pass filter 31, being mainly used to filter the temperature that factors such as environment apoplexy and sunlight cause floats, the frequency of human body signal is mainly between 0.6HZ-1.2HZ, and the influence factor in the environment, for example wind, sunlight can cause the slow especially of signal variation, and frequency is low especially, can directly by Hi-pass filter 31 these influence factors be filtered.
In the present embodiment, described signal amplifier 32 is mainly used to isolate out the DC component in the signal, and provides a constant bias voltage to it, and only the AC signal that we are needed is amplified.
In the present embodiment, described low-pass filter 33 is mainly used to further eliminate noise signal, improves detection sensitivity.
In the present embodiment, described A/D converter 34 mainly is made up of 0805F020 type single-chip microcomputer, and the analog signal conversion that is used for involving after filtration after the processing and amplifying is the digital signal that the signal processing modules 21 in the master controller 2 are discerned.
In the present embodiment, described turntable module 4, mainly be to utilize a stepper motor able to programme, instruction uniform rotation according to master controller 2 transmissions, thereby drive pyroelectric infrared sensor 1 on it with suitable specific speed uniform rotation, and starting point and ad-hoc location at a time are provided for pyroelectric infrared sensor 1.
Fig. 3 is the process flow diagram that the present invention is based on the detection method of the target detection system of dynamically using pyroelectric infrared sensor down
3 pairs of detection methods that the present invention is based on the target detection system of the dynamic pyroelectric infrared sensor of use down are described in detail in conjunction with the accompanying drawings.
Step S101 is provided with the reference position at zero point of pyroelectric infrared sensor 1.
Step S102, pyroelectric infrared sensor 1 is gathered the background initialize signal.
Step S103, infrared acquisition hardware processing unit carries out hardware handles to the background initialize signal of gathering among the step S102, and the hardware handles process is as follows:
(1) 31 pairs of background initialize signals of Hi-pass filter carry out high-pass filtering and float to eliminate temperature;
(2) the background initialize signal of signal amplifier after to high-pass filtering carries out signal and amplifies;
(3) low-pass filter carries out low-pass filtering with further elimination noise signal to the background initialize signal after amplifying;
(4) the background initialize signal of A/D converter after with low-pass filtering carries out the A/D conversion.
Step S104, the signal processing module 21 in the master controller 2 extracts the background initialize signal after the A/D conversion, carries out analyzing and processing and rendering context initialize signal waveform.
Step S105, master controller 2 sends beginning rotate instruction and rotational angle instruction to turntable module 4.
Step S106, turntable module 4 utilizes stepper motor uniform rotation able to programme, thereby drives pyroelectric infrared sensor 1 uniform rotation on it according to the instruction that master controller 2 sends, and rotates the angle of master controller 2 defineds.
Step S107, pyroelectric infrared sensor 1 carries out the detection signal collection.
Step S108, the detection signal of gathering among 3 couples of step S107 of infrared acquisition hardware processing unit carries out hardware handles, and the hardware handles process is as follows:
1) 31 pairs of detection signals of Hi-pass filter carry out high-pass filtering and float to eliminate temperature;
2) detection signal of signal amplifier after to high-pass filtering carries out signal and amplifies;
3) low-pass filter carries out low-pass filtering with further elimination noise signal to the detection signal after amplifying;
4) detection signal of A/D converter after with low-pass filtering carries out the A/D conversion.
Step S109, the signal processing module 21 in the master controller 2 extracts the detection signal after the A/D conversion, carries out analyzing and processing, and draws detection signal waveform.
Step S110, signal processing module 21 adopt the frame-to-frame differences point-scores that the background initialize signal waveform that obtains among the detection signal waveform that obtains among the step S109 and the step S104 is carried out corresponding volt value subtraction calculations, obtain lying prostrate the value difference value.
Described frame-to-frame differences point-score is that field of image recognition is carried out the common method that target is judged, be that gray-scale value with front and back two two field picture corresponding pixel points subtracts each other, change under the little situation at ambient brightness, if the respective pixel gray scale differs very little, can think that scenery is static herein, if the grey scale change in image-region somewhere is very big, can think that this is owing to moving object in the image causes, these zone markers are got off, utilize the pixel region of these marks, just can obtain the position of moving target in image.
In the present embodiment, turntable module 4 provides a start signal for pyroelectric infrared sensor 1, a rz signal is given in every three-sixth turn again, whenever adopt all signals all with the last week signal volt value subtract each other, be equivalent to weekly acquired signal and regard every two field picture in the image as.
Step S111 judges whether volt value difference value surpasses preset threshold, if, then judge target to occur, execution in step S112, otherwise target does not appear in judgement, and repeated execution of steps S105 is to step S111.
Step S112 extracts echo signal, and alarm unit carries out alarm.
In a word, what embodiments of the invention were announced is its preferred implementation, but is not limited to this.Those of ordinary skill in the art understands spirit of the present invention very easily according to the foregoing description, and makes different amplifications and variation, but only otherwise break away from spirit of the present invention, all within protection scope of the present invention.
Claims (6)
1. one kind based on the target detection system of dynamically down using pyroelectric infrared sensor, it is characterized in that: comprise pyroelectric infrared sensor, the master controller that is connected with described pyroelectric infrared sensor, the infrared acquisition hardware processing unit that is connected with described master controller with described pyroelectric infrared sensor respectively, also comprise the lower end and the turntable module that matches with it that are arranged on described pyroelectric infrared sensor, be arranged on the signal processing module in the described master controller, described turntable module also is connected with described master controller.
2. according to claim 1 based on the target detection system of dynamically using pyroelectric infrared sensor down, it is characterized in that: described infrared acquisition hardware processing unit comprises Hi-pass filter, signal amplifier, low-pass filter and A/D converter successively, described Hi-pass filter is connected with described pyroelectric infrared sensor, and described A/D converter is connected with described master controller.
3. according to claim 1 and 2 based on the target detection system of dynamically using pyroelectric infrared sensor down, it is characterized in that: described pyroelectric infrared sensor comprises double base pyroelectric infrared-sensing body and is arranged on the Fresnel Lenses of described double base pyroelectric infrared-sensing body front.
4. according to claim 3 based on the target detection system of dynamically using pyroelectric infrared sensor down, it is characterized in that: described master controller also is connected with alarm unit.
5. the detection method based on the target detection system of use pyroelectric infrared sensor under dynamic as claimed in claim 1 is characterized in that, may further comprise the steps:
1) reference position at zero point of pyroelectric infrared sensor is set;
2) pyroelectric infrared sensor is gathered the background initialize signal;
3) infrared acquisition hardware processing unit is to step 2) in the background initialize signal gathered carry out hardware handles;
4) the background initialize signal the signal processing module extraction step 3 in the master controller) after hardware handles, and rendering context initialize signal waveform;
5) master controller sends beginning rotate instruction and rotational angle instruction to turntable module;
6) turntable module drives the angle that pyroelectric infrared sensor begins to rotate and rotate regulation according to the instruction in the step 6);
7) pyroelectric infrared sensor carries out the detection signal collection;
8) infrared acquisition hardware processing unit carries out hardware handles to the detection signal of gathering in the step 7);
9) detection signal the signal processing module extraction step 8 in the master controller) after hardware handles is drawn detection signal waveform;
10) signal processing module adopts the frame-to-frame differences point-score that the detection signal waveform in the step 9) is carried out corresponding volt value subtraction calculations with background initialize signal waveform in the step 4), obtains lying prostrate the value difference value;
11) judge whether volt value difference value surpasses preset threshold, if then judge target, execution in step 12 to occur), otherwise target, repeated execution of steps 5 do not appear in judgement) to step 11);
12) extract echo signal, alarm unit carries out alarm.
6. according to claim 5 based on the detection method that dynamically uses the target detection system of pyroelectric infrared sensor down, it is characterized in that described step 8) comprises step by step following:
8.1) Hi-pass filter carries out high-pass filtering to detection signal and float to eliminate temperature;
8.2) signal amplifier is to through step by step 8.1) and in detection signal after the high-pass filtering carry out signal and amplify;
8.3) low-pass filter is to step by step 8.2) and in detection signal after amplifying carry out low-pass filtering with further elimination noise signal;
8.4) A/D converter will be through step by step 8.3) and in detection signal after the low-pass filtering carry out the A/D conversion.
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| CN102590884A (en) * | 2012-02-15 | 2012-07-18 | 浙江大学 | Human body positioning and following system and method based on pyroelectric infrared sensors |
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| CN106354057A (en) * | 2016-09-19 | 2017-01-25 | 深圳市共进电子股份有限公司 | Pick-up device |
| CN106354057B (en) * | 2016-09-19 | 2018-11-13 | 深圳市共进电子股份有限公司 | Photographic device |
| US10891838B2 (en) | 2017-05-10 | 2021-01-12 | Carrier Corporation | Detecting device and control system with such detecting device |
| CN108109306A (en) * | 2017-12-27 | 2018-06-01 | 中国电子科技集团公司第五十四研究所 | A kind of low-power-consumption infrared and image composite sensing detection device |
| CN109341868A (en) * | 2018-12-03 | 2019-02-15 | 北京遥感设备研究所 | A kind of sensitivity Auto-Test System and method |
| CN109341868B (en) * | 2018-12-03 | 2020-11-13 | 北京遥感设备研究所 | Automatic sensitivity testing system and method |
| CN109587400A (en) * | 2018-12-24 | 2019-04-05 | 中北大学 | Comprehensive single module rpyroelectric infrared detection camera arrangement and detection method |
| CN111501930A (en) * | 2019-01-31 | 2020-08-07 | 厦门科牧智能技术有限公司 | Defecation identification method, toilet flushing control device and toilet |
| CN112284551A (en) * | 2020-10-22 | 2021-01-29 | 成都理想科技开发有限公司 | Method and system for filtering small heat source interference of infrared detector |
| CN113791455A (en) * | 2021-09-07 | 2021-12-14 | 深圳创维－Rgb电子有限公司 | Presence type human body detection device and system |
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| CN102183795B (en) | 2013-12-25 |
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