CN204331053U - A kind of bottled dangerous liquid detection system based on radar sensor - Google Patents
A kind of bottled dangerous liquid detection system based on radar sensor Download PDFInfo
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- CN204331053U CN204331053U CN201520009613.1U CN201520009613U CN204331053U CN 204331053 U CN204331053 U CN 204331053U CN 201520009613 U CN201520009613 U CN 201520009613U CN 204331053 U CN204331053 U CN 204331053U
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Abstract
The utility model relates to a kind of bottled dangerous liquid detection system based on radar sensor, comprises microwave radar sensor, AD converter, data processor and display and warning device.Microwave radar sensor, its output terminal is connected with the input end of AD converter.Described AD converter is connected alternately with data processor.Described data processor, its output terminal is connected with the input end of display and warning device.From above technical scheme, the utility model can make up the deficiencies in the prior art, has the features such as integrated level is high, low in energy consumption, detection speed is fast.
Description
Technical field
The utility model relates to anti-explosion safety inspection technical field, is specifically related to a kind of bottled dangerous liquid detection system based on radar sensor.
Background technology
In recent years, the matters of aggravation using dangerous liquid to cause occurs again and again, lawless person carries the container that dangerous liquid is housed and enters densely populated public place and carry out the attack of terrorism, not only causes a tremendous loss of lives and property loss, and causes harmful effect to the harmony of society with stable.How taking precautions against the dangerous liquids such as gasoline, alcohol, banana oil and enter public place, is current field of safety check urgent problem.
At present, dangerous liquid pick-up unit many employings x-ray projection on market, Raman spectroscopy, accurate electrostatic tomography and ultra-wideband pulse microwave technology, but they all have limitation in various degree, as huge in x-ray equipment, minimum detectable quantity is large, fails to report rate of false alarm high; Raman spectroscopy is long for detection time, and restriction container is clear glass or plastic bottle; Accurate electrostatic tomography is subject to electromagnetic interference (EMI) in surrounding environment, poor accuracy; Ultra-wideband pulse microwave technology circuit implementations is complicated, and accessible site degree is low is unfavorable for the miniaturization realizing equipment.
Utility model content
The purpose of this utility model is to provide a kind of bottled dangerous liquid detection system based on radar sensor, and this detection system can make up the deficiencies in the prior art, has the features such as integrated level is high, low in energy consumption, detection speed is fast.
For achieving the above object, the utility model have employed following technical scheme:
Based on a bottled dangerous liquid detection system for radar sensor, comprise microwave radar sensor, AD converter, data processor and display and warning device.
Described microwave radar sensor, its output terminal is connected with the input end of AD converter; Described AD converter is connected alternately with data processor; Described data processor, its output terminal is connected with the input end of display and warning device.
Described microwave radar sensor comprises signal transmission channel and Signal reception passage.Described signal transmission channel comprises voltage controlled oscillator, the first Wilkinson power divider, launches microstrip antenna array, the second Wilkinson power divider and 90 ° of phase shifters.Described Signal reception passage comprises reception microstrip antenna array, low noise amplifier, the 3rd Wilkinson power divider, the first frequency mixer, the second frequency mixer, the first low-pass filter and the second low-pass filter.
Described voltage controlled oscillator, its output terminal is connected with the input end of the first Wilkinson power divider.First Wilkinson power divider, its output terminal is connected with the input end of transmitting microstrip antenna array, the second Wilkinson power divider respectively.Second Wilkinson power divider, its output terminal is connected with the input end of the first frequency mixer, the second frequency mixer respectively, and the second Wilkinson power divider is connected with the second frequency mixer by 90 ° of phase shifters.Receive microstrip antenna array, its input end is connected with the output terminal launching microstrip antenna array, and its output terminal is connected with the input end of low noise amplifier.Low noise amplifier, its output terminal is connected with the input end of the 3rd Wilkinson power divider.3rd Wilkinson power divider, its output terminal is connected with the input end of the first frequency mixer, the second frequency mixer respectively.First frequency mixer, its output terminal connects the input end of AD converter through the first low-pass filter.Second frequency mixer, its output terminal connects the input end of AD converter through the second low-pass filter.
Further, described AD converter adopts ADS1256 analog to digital converter.
Further, described data processor adopts STM32 chip.
Further, the oscillation frequency of described voltage controlled oscillator is 24GHz.
From above technical scheme, the utility model has the features such as implementation is simple, integrated level is high, low in energy consumption, detection speed is fast.First, by adopting oscillation frequency to be the voltage controlled oscillator of 24GHz, detection system can not only be made at 24GHz frequency ranges of operation, size and the volume of antenna array can also be reduced, improve the integrated level of detection system.24GHz is a radar working frequency range of the global general-use that ISM specifies, meets FCC (Federal Communications Commission, FCC) and specifies Power Limitation, to external world the advantage such as noiseless and environmental protection.Secondly, because test sample wants cover antenna, so antenna is less, the deal of the test sample of needs is also fewer, thus improves detection sensitivity.Again, because system is some a continuous wave frequently, processing signals is direct current signal, does not need frequency sweep and conversion, so greatly reduce single detection time, also optimizes system.In the utility model, microwave radar sensor passes through transmission channel launched microwave signal to tested liquid, receiving cable receives the signal that tested liquid returns, two-way orthogonal signal I after mixing and filtering and Q is sent in AD converter, signal after AD conversion is sent in data processor, data processor, according to echo signal power size, controls the duty of display and warning device.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Wherein:
1, microstrip antenna array is received, 2, low noise amplifier, the 3, the 3rd Wilkinson power divider, 4, the second frequency mixer, the 5, second low-pass filter, 6, AD converter, 7, data processor, 8, display and warning device, the 9, first frequency mixer, 10, the first low-pass filter, 11,90 ° of phase shifters, the 12, second Wilkinson power divider, 13, launch microstrip antenna array, 14, the first Wilkinson power divider, 15, voltage controlled oscillator.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
A kind of bottled dangerous liquid detection system based on radar sensor as shown in Figure 1, comprises microwave radar sensor, AD converter 6, data processor 7 and display and warning device 8.Radar sensor be generally applied to test the speed, find range, interception.Radar sensor is used for liquid detecting by the utility model first.
Described microwave radar sensor, its output terminal is connected with the input end of AD converter 6; Described AD converter 6 is connected alternately with data processor 7; Described data processor 7, its output terminal is connected with the input end of display and warning device 8.Preferably, described AD converter adopts ADS1256 analog to digital converter.Described data processor adopts STM32 chip.
Described microwave radar sensor comprises signal transmission channel and Signal reception passage.Described signal transmission channel comprises voltage controlled oscillator 15, first Wilkinson power divider 14, launches microstrip antenna array 13, second Wilkinson power divider 12 and 90 ° of phase shifters 11.The oscillation frequency of described voltage controlled oscillator is 24GHz.Described Signal reception passage comprises reception microstrip antenna array 1, low noise amplifier 2, the 3rd Wilkinson power divider 3, first frequency mixer 9, second frequency mixer 4, first low-pass filter 5 and the second low-pass filter 10.
Described voltage controlled oscillator 15, its output terminal is connected with the input end of the first Wilkinson power divider 14.First Wilkinson power divider 14, its output terminal is connected with the input end launching microstrip antenna array 13, second Wilkinson power divider 12 respectively.Second Wilkinson power divider 12, its output terminal is connected with the input end of the first frequency mixer 9, second frequency mixer 4 respectively, and the second Wilkinson power divider 12 is connected with the second frequency mixer 4 by 90 ° of phase shifters 11.Receive microstrip antenna array 1, its input end is connected with the output terminal launching microstrip antenna array 13, and its output terminal is connected with the input end of low noise amplifier 2.Low noise amplifier 2, its output terminal is connected with the input end of the 3rd Wilkinson power divider 3.3rd Wilkinson power divider 3, its output terminal is connected with the input end of the first frequency mixer 9, second frequency mixer 4 respectively.First frequency mixer 9, its output terminal connects the input end of AD converter 6 through the first low-pass filter 10.Second frequency mixer 4, its output terminal connects the input end of AD converter 6 through the second low-pass filter 5.
Principle of work of the present utility model is:
Voltage controlled oscillator 15 shakes launches 24GHz microwave signal, and this microwave signal is divided into two paths of signals through the first Wilkinson power divider 14: a road is launched through launching microstrip antenna array 13, and another road second Wilkinson power divider 12 is divided into two paths of signals.The two paths of signals that second Wilkinson power divider 12 exports, a road enters the first frequency mixer 9, and another road enters the second frequency mixer 4 after the phase shift of 90 ° of phase shifters 11.Now, the two paths of signals shunted by voltage controlled oscillator 15 is as the local oscillation signal of two frequency mixer.
Receive microstrip antenna array 1 and receive echoed signal, first after low noise amplifier 2 amplifies, then be divided into two paths of signals through the 3rd Wilkinson power divider 3, the local oscillation signal respectively through the first frequency mixer 9 and the second frequency mixer 4 and two frequency mixer carries out mixing.
The direct current signal obtained after the first frequency mixer 9, second frequency mixer 4 mixing is more respectively after the first low-pass filter 10 and the second low-pass filter 5 low-pass filtering treatment, two-way analog voltage signal is converted to digital signal by AD converter 6 (ADS1256), export to data processor 7 (STM32 single-chip microcomputer), data processor 7 is according to echo power size, hazard recognition liquid and water, and export control signal control display and warning device 8.The difference of planform per sample, can place multiple microwave radar sensor at diverse location.
In the utility model, because echoed signal frequency and local oscillation signal are that be direct current signal after mixing, if single channel mixing, then the phase and magnitude relation of signal is inseparable, and namely mixed signal is with frequently
k is the information relevant with frequency mixer and local oscillation signal amplitude, A
rFfor radiofrequency signal amplitude,
for the phase differential of local oscillation signal and radiofrequency signal, and two-way mixing can obtain two-way orthogonal signal, i.e. I and Q, wherein:
The amplitude information of radiofrequency signal can be drawn thus
its size and phase place have nothing to do.
Above-described embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that the utility model claims determine.
Claims (4)
1. based on a bottled dangerous liquid detection system for radar sensor, it is characterized in that: comprise microwave radar sensor, AD converter (6), data processor (7) and display and warning device (8);
Described microwave radar sensor, its output terminal is connected with the input end of AD converter (6); Described AD converter (6) is connected alternately with data processor (7); Described data processor (7), its output terminal is connected with the input end of display and warning device (8);
Described microwave radar sensor comprises signal transmission channel and Signal reception passage; Described signal transmission channel comprises voltage controlled oscillator (15), the first Wilkinson power divider (14), launches microstrip antenna array (13), the second Wilkinson power divider (12) and 90 ° of phase shifters (11); Described Signal reception passage comprises reception microstrip antenna array (1), low noise amplifier (2), the 3rd Wilkinson power divider (3), the first frequency mixer (9), the second frequency mixer (4), the first low-pass filter (10) and the second low-pass filter (5);
Described voltage controlled oscillator (15), its output terminal is connected with the input end of the first Wilkinson power divider (14); First Wilkinson power divider (14), its output terminal is connected with the input end of transmitting microstrip antenna array (13), the second Wilkinson power divider (12) respectively; Second Wilkinson power divider (12), its output terminal is connected with the input end of the first frequency mixer (9), the second frequency mixer (4) respectively, and the second Wilkinson power divider (12) is connected with the second frequency mixer (4) by 90 ° of phase shifters (11); Receive microstrip antenna array (1), its input end is connected with the output terminal launching microstrip antenna array (13), and its output terminal is connected with the input end of low noise amplifier (2); Low noise amplifier (2), its output terminal is connected with the input end of the 3rd Wilkinson power divider (3); 3rd Wilkinson power divider (3), its output terminal is connected with the input end of the first frequency mixer (9), the second frequency mixer (4) respectively; First frequency mixer (9), its output terminal connects the input end of AD converter (6) through the first low-pass filter (10); Second frequency mixer (4), its output terminal connects the input end of AD converter (6) through the second low-pass filter (5).
2. a kind of bottled dangerous liquid detection system based on radar sensor according to claim 1, is characterized in that: described AD converter (6) adopts ADS1256 analog to digital converter.
3. a kind of bottled dangerous liquid detection system based on radar sensor according to claim 1, is characterized in that: described data processor (7) adopts STM32 chip.
4. a kind of bottled dangerous liquid detection system based on radar sensor according to claim 1, is characterized in that: the oscillation frequency of described voltage controlled oscillator (15) is 24GHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520009613.1U CN204331053U (en) | 2015-01-07 | 2015-01-07 | A kind of bottled dangerous liquid detection system based on radar sensor |
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| CN201520009613.1U CN204331053U (en) | 2015-01-07 | 2015-01-07 | A kind of bottled dangerous liquid detection system based on radar sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044788A (en) * | 2015-07-24 | 2015-11-11 | 安徽瑞迪太检测技术有限公司 | Channel-type parcel security inspection machine based on nuclear quadrupole moment resonance technology |
| CN106872490A (en) * | 2017-03-10 | 2017-06-20 | 四川莱源科技有限公司 | Moisture content tester based on radar |
| CN109883535A (en) * | 2019-01-25 | 2019-06-14 | 陕煤集团神木张家峁矿业有限公司 | A kind of vibration measurement device and method based on millimeter wave |
-
2015
- 2015-01-07 CN CN201520009613.1U patent/CN204331053U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044788A (en) * | 2015-07-24 | 2015-11-11 | 安徽瑞迪太检测技术有限公司 | Channel-type parcel security inspection machine based on nuclear quadrupole moment resonance technology |
| CN106872490A (en) * | 2017-03-10 | 2017-06-20 | 四川莱源科技有限公司 | Moisture content tester based on radar |
| CN109883535A (en) * | 2019-01-25 | 2019-06-14 | 陕煤集团神木张家峁矿业有限公司 | A kind of vibration measurement device and method based on millimeter wave |
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