CN1707283A - Underground intelligent vehicle detector - Google Patents
Underground intelligent vehicle detector Download PDFInfo
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- CN1707283A CN1707283A CN 200410010333 CN200410010333A CN1707283A CN 1707283 A CN1707283 A CN 1707283A CN 200410010333 CN200410010333 CN 200410010333 CN 200410010333 A CN200410010333 A CN 200410010333A CN 1707283 A CN1707283 A CN 1707283A
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Abstract
The intelligent geographic vehicle detector consists of detecting unit, signal processing and logical processing unit for processing signal from the detecting unit through amplification, filtering, shaping, comparison, sensitivity regulation, environment compensation, A/D acquisition, automatic calibration, logic analysis, coding, storing, etc., signal conversion/transmission interface unit, power source and casing. It may have sub-detector connected. It may be used in detecting vehicle to obtain various dynamic and static information, including path, speed, parking time, running direction, etc. and is suitable for traffic management, vehicle monitoring, toll gate management, park management, etc.
Description
Technical field
The present invention relates to a kind of sniffer, particularly relate to a kind of earth-buried intelligent vehicle detector, this device can be used for city or road traffic guidance management system and vehicle static management system, can sail dynamically or the detection of static information vehicle, be applicable to the monitoring management system of traffic lights green wave band control system, electronic police photographic system, vehicle toll station system, vehicle doorn access control system, managing system of car parking and road grid traffic etc. through vehicles such as, side race, vehicle flowrate, road occupying, traffic congestion, berthing times.
Background technology
Raising along with expanding economy and living standards of the people, automobile more and more near-earth is walked close to people's life, urban transportation and highway communication jam happen occasionally, particularly the traffic of large-and-medium size cities has been one of focal issue of government, common people's concern, make great amount of manpower and material resources, fund input to road reformation and road construction aspect, nonetheless, do not catch up with the rapid growth of traffic pressure yet, this situation is very general, the area that reaches all the more of economy particularly, the traffic congestion phenomenon is serious more; Some area, through want of funds, road reformation and road construction be objectively also difficult, in the face of the unfavorable situation of traffic pressure will the long term existence; On the other hand, path resource does not make full use of and taps the latent power, and causes the path resource waste quite serious yet, allows the people feel more pained.Therefore, how make full use of and tap the latent power path resource, improve at low cost, utilization rate, vehicle flow and the car speed of road effectively, it is the target that is worthy of consideration and pursues, address this problem and to set up perfect, efficiently and cheaply traffic information system and traffic control system, and vehicle and vehicle flowrate detector are important rings wherein.
At present, the detector of relevant vehicle adopt mostly passive infrared come the detection vehicle signal and amplify after be transferred to point duty department, be 98802297.4 " motor vehicle detector " etc. as the application number of patent Siemens Company; Also having some is to be sniffer with large-scale inductive coil, vehicle is during through large-scale inductive coil, vehicle sail through or stop on the large-scale inductive coil, make the inductance value of its coil change, the electric signal that causes the detection circuit output that is made of with other circuit this coil is also along with changing, form the vehicle detection signal, be generally frequency signal, send processor to handle, obtain transport information such as vehicle flowrate, these sniffers exist the vehicle detection mode single, and detection information is not comprehensive, and volume is big, install inconvenient, road pavement is destroyed serious during installation, because shortcomings such as the be full of cracks on road surface easily is damaged.In addition, a kind of permanent type wireless vehicle register that utilizes vehicle magnetic reflection (VMI) commercial measurement vehicle flowrate produced in USA, but this sniffer is to the travel speed of detection vehicle, and slower to the speed of a motor vehicle or that rest in its installed position or when resting near its installation site vehicle and surveying, limitation and deficiency with function or aspect of performance can not satisfy the monitoring, management, command system of urban traffic intersection, parking lot and the road grid traffic situation requirement to motor vehicle detector fully.
Summary of the invention
The purpose of this invention is to provide more fully motor vehicle detector of a kind of information of vehicles with multiple detection mode, detection, to solve the deficiency of existing motor vehicle detector.
For achieving the above object, the present invention adopts following technical scheme:
A kind of earth-buried intelligent vehicle detector, it is by probe unit, the corresponding signal output that is used to finish probe unit is amplified, filtering, shaping, relatively, sensitivity adjustment, ambient compensation, signal A/D is gathered, automatically imitate accurate, logic analysis or to the amplitude of signal, frequency, width, signal envelope amplification speed and time domain specification carry out analysis and judgement and the result are encoded, signal Processing/the Logical processing unit of at least one work in storage and the statistical work, signal transformation/transmission interface unit, power supply and housing are formed, power supply is each element circuit power supply, probe unit is the earth induction sniffer of detecting element and what be used to survey earth magnetism magnetic field intensity/magnetic flux density is that the one kind of sniffer of the earth magnetism amount detector of detecting element constitutes with the magneto sensor with the earth coil by what be used for surveying the earth magnetism changes of magnetic field at least, plug into the respectively respective input of signal Processing/Logical processing unit of the output terminal of probe unit, the output terminal of signal Processing/Logical processing unit is connected with the respective input of signal transformation/transmission interface unit.
Above-mentioned earth-buried intelligent vehicle detector, it is characterized in that, the earth induction sniffer that with the earth coil is detecting element is made of earth coil and coil induced potential input/treatment circuit, the earth magnetism amount detector that with the magneto sensor is detecting element is made of magneto sensor and magnetosensitive signal environment compensation/detection/treatment circuit, and magneto sensor is a mistor, magnetodiode, magnetic transister, 3CCM type magnetic transister, 4CCM type magnetic transister, the magnetosensitive electric bridge, Hall element, integrated magnetic field sensor/module or single shaft/multiaxis monolithic integrated magnetic field sensor/module.
Above-mentioned earth-buried intelligent vehicle detector is characterized in that, includes the sniffer that detecting element that two or more are made of identical detecting element or inequality constitutes in the probe unit.Above-mentioned earth-buried intelligent vehicle detector is characterized in that, is provided with a temperature sensing device in the probe unit, and its output terminal is connected with the respective input of signal Processing/Logical processing unit.Above-mentioned earth-buried intelligent vehicle detector, it is characterized in that signal transformation/transmission interface unit is provided with at least a output/transmission circuit apparatus of the circuit arrangement of the high-low level/impulse output circuit device, audio signal output circuit arrangement, electronic switch on/off output circuit device, collector output circuit device, photoelectricity isolation and transmission circuit device, standard/non-standard serial/parallel row communication interface/bus transfer circuit arrangement, radio communication signal transmission circuit apparatus and the transmission of optical-fibre communications signal that are used for detectable signal output.
Above-mentioned earth-buried intelligent vehicle detector, it is characterized in that, be provided with metal detecting device in the probe unit, the metal detection oscillator that metal detecting device is made of metal induction detecting coil that produces alternating magnetic field and the oscillatory circuit that matches with it and be used for detecting or identify voltage magnitude with metal induction detecting coil two ends from the metal detection oscillator, the metal approach signal discriminatings/testing circuit formation of at least a information in the relevant information of induced current by metal induction detecting coil or metal detection oscillator oscillation frequency, metal approach signal discriminating/testing circuit is made up of wave detector/rectifier and comparer/gate, perhaps form by the difference frequency type reference oscillator, metal detection oscillator and difference frequency type reference oscillator constitute double frequency self-heterodyne oscillator, perhaps form by reference oscillator and frequency mixer, the output of surveying oscillator and the reference oscillator respective input of mixer of plugging into respectively, perhaps by reference oscillator, two-way oscillator signal treatment circuit and mixer are formed, the output of metal detection oscillator and reference oscillator one road oscillator signal treatment circuit of respectively plugging into, plug into the respectively input end of mixer of oscillator signal treatment circuit, perhaps constitute by the superheterodyne signal receiver circuit, the metal of metal detection oscillator induction detecting coil parallel with the receiving coil of superheterodyne signal receiver circuit near, the plug into respective input of signal Processing/Logical processing unit of the plug into input end of signal Processing/Logical processing unit of the output of superheterodyne signal receiver circuit, the output of metal signal discriminating/testing circuit.
Above-mentioned earth-buried intelligent vehicle detector, it is characterized in that, the center of being equipped with is axially arranged with uncovered cavity magnetic core of at least one end or cavity coil rack in the metal induction detecting coil, and earth coil and other part or all of detector electric component are set in the cavity of this magnetic core or coil rack.
Above-mentioned earth-buried intelligent vehicle detector, it is characterized in that, it is characterized in that, each circuit unit in vehicle detector or the sub-detector is arranged to satisfy the module of different needs, or utilize large scale integrated circuit, special IC/module, little processing one-chip computer or digital signal processor DSP that the function of corresponding each circuit unit is organically merged or decomposes, make half integrated or integrated circuit module/wiring board.
Above-mentioned earth-buried intelligent vehicle detector is characterized in that, signal Processing/Logical processing unit other sub-detector of can plugging into independent case, and this sub-detector includes above-mentioned probe unit.
Above-mentioned earth-buried intelligent vehicle detector, it is characterized in that, power supply is wired power supply, accumulator or the solar battery group with mu balanced circuit, magneto sensor can be provided with the earth magnetism buncher as required, housing is that the whole plastic packaging of removable stand alone type or detector assembly becomes form, and its profile is cylindrical or oblate.
Earth-buried intelligent vehicle detector operation principle of the present invention is described below:
The principle of work of vehicle earth induction sniffer and earth magnetism amount detector: since every vehicle from detector sail through or when stopping, vehicle can make the earth magnetic field intensity at this detector place or magnetic flux change, with the earth coil is detecting element, when constituting the earth induction sniffer, the magnetic field of the earth of variation makes the induction electromotive force at earth coil two ends that corresponding variation also take place; With the magneto sensor is detecting element, when constituting the earth magnetism amount detector, the corresponding variation takes place in the signal output that earth magnetic field intensity that changes or magnetic flux make magneto sensor thereupon, by detection, analysis and processing to the earth induction signal or the earth magnetic field intensity signal of this vehicle, can reach detection vehicle through, near or the purpose of signals of vehicles when sailing out of the detector place.
The principle of work of metal detecting device: because vehicle chassis is made by the bigger hardware of volume, when vehicle sail through or when resting in the detector place that is embedded in the road surface, the metal induction detecting coil of the metal detection oscillator in the metal detecting device produces alternating magnetic field can make the hardware of vehicle chassis produce the eddy current of inducting because of electromagnetic induction phenomenon, the electromagnetic field of eddy current of inducting will be revolted the variation of former alternating electromagnetic field, thereby the metal that makes the metal detection oscillator of former generation alternating electromagnetic field is responded to the oscillating current of detecting coil and is all changed to some extent in amplitude with on the cycle, distance is near more, oscillating current amplitude and change on the cycle many more, this variable quantity is with corresponding current signal, the variation of frequency signal or detecting circuit signal presents, after suitable discriminating and handling, can reach the detection vehicle process, near or the purpose of signals of vehicles when sailing out of the detector place.
Earth-buried intelligent vehicle detector of the present invention, make full use of detection and processing to vehicle ground magnetic signal, in addition to the detection and the processing of vehicle metal signal, the feature performance benefit of the sniffer that comprehensive corresponding detecting element constituted, and the difference setting of the detection range of sniffer or detection sensitivity, obtain different, the vehicle detection signal that comprises more information, by being used signal, amplifies each detectable signal, filtering, shaping, identification, relatively, means such as signals collecting or logic analysis, amplitude to signal, frequency, width, signal envelope amplification speed and time domain amplitude versus frequency characte are carried out analysis and judgement, and the data result encoded, storage and statistics, reaching each detector learns from other's strong points to offset one's weaknesses, the identification of the detection of a target and state, improved the reliability of vehicle detector, increase the quantity of information of vehicle detector, can be easy to obtain rushing line, side is run, vehicle flowrate, the road occupancy, the speed of a motor vehicle, information such as down time.Therefore can satisfy the needs of different application scenarios and field, different technical requirement, different detection purpose better.Its volume is little, modularization, compact conformation, reliability height, flexible for installation, convenient, fast, can adopt the full seal type shell, require low, non-maintaining to installing environmental conditions, be particularly suitable for outdoor and open-air use, abominable weather environment as rain, blow, sandstorm, temperature variation be to the not influence of its result of use.During installation, can on the track, hole and be embedded in pavement of road, not damage the road surface basically, not take the above space of pavement of road; Certainly, also can be mounted on the road surface, perhaps be installed in pavement of road above, do not influence vehicle by and be no more than the locus of detection range.It can to vehicle sail through vehicles such as, multilane section vehicle flowrate, the speed of a motor vehicle, traffic congestion, berthing time and travel direction dynamically or static information survey, be applicable to the control of traffic lights green wave band, electronic police photographic system, the charge station monitoring management system of system, vehicle doorn access control system and managing system of car parking and road grid traffic etc. of keeping off a car, also be applicable to safety monitoring system, warning system.
Description of drawings
Fig. 1 is the axial cut-open view of the embodiment of the invention 1.
Fig. 2 is the circuit theory diagrams of the embodiment of the invention 1.
Fig. 3 is the axial cut-open view of the embodiment of the invention 2.
Fig. 4 is the circuit theory diagrams of the embodiment of the invention 2.
Fig. 5 is the axial cut-open view of the embodiment of the invention 3.
Fig. 6 is the vertical view of Fig. 5.
Fig. 7 is the circuit theory diagrams of the embodiment of the invention 3.
Embodiment
As shown in Figure 1, the detector of present embodiment is by temperature sensor (13), temperature sensor extension line (14), monolithic magnetic field sensor integrated (21), magnetic field sensor extension line (22), vehicle earth coil (1), earth coil skeleton (31), earth coil magnetic core (2), earth coil extension line (3), metal induction detecting coil (4), metal induction detecting coil magnetic core (5), circuit module wiring board (9), stube cable (8), remote I/O serial interface circuit (7), power lead and signal cable (10), plastic casing body (11) and plastic casing lid (12) are formed.Metal induction detecting coil (4) installs around the hypomere at " tubular " metal induction detecting coil magnetic core (5) of high magnetic conduction, in the internal cavity of magnetic core (5) center temperature sensor (13) is set from top to down, monolithic integrated magnetic field sensor (21), vehicle earth coil (1), circuit module wiring board (9) and remote I/O serial interface circuit (7), metal induction detecting coil (4) is connected with circuit module wiring board (9) by its extension line (6), temperature sensor (13), monolithic magnetic field sensor integrated (21) and vehicle earth coil (1) are respectively by its extension line (14,22 and 3) be connected with circuit module wiring board (9), circuit module wiring board (9) is connected by stube cable (8) with remote I/O serial interface circuit (7), and power lead and signal output cable (10) are by plastic casing (11,12) be connected with remote I/O serial interface circuit (7) with circuit module wiring board (9).
As shown in Figure 2, circuit theory diagrams for present embodiment, power supply is made up of two-way, one routing regulator circuit U1, C1, C2, C3,1. and 2. constitute, U1 is the 78L05 three terminal regulator, another routing regulator circuit U2, C4,1. and 2. constitute, U2 is that 78L09 three terminal regulator U3 is inductive switch integrated circuit TDA0161D, TDA0161D inside is integrated with the pierce circuit unit, the detector circuit unit, comparator circuit unit and variable constant current source circuit etc., L1 is a metal induction detecting coil (4), L1, C5, C6, C7, R1, R2, R3 and TDA0161D constitute metal detecting device; DRT is the linear temperature sniffer; U4 is an AD22151 monolithic integrated magnetic field sensor, constitute earth magnetism magnetic field intensity sniffer by U4, R4, R5, R6 and C8, vehicle earth induction sniffer constitutes the vehicle earth induction by earth coil L2, U5-1, U5-2, U5-3, C10-C14, R7-R14 to be surveyed and signal processing circuit, and U5 is the LM224/324 integrated transporting discharging; U6 is the AVR single-chip microcomputer, is main devices with U6, constitutes intelligent signal processing/Logical processing unit that four road detectable signals are carried out signals collecting, data analysis and processing and storage; I/O is the three-way long-distance transmissions interface unit of standard form RS-485,1. be power supply just, 2. be power supply ground, 3. be transmission cable, they constitute signal transformation/transmission interface unit.
According to the principle of work of above-mentioned vehicle metal detecting device, earth magnetism amount detector and earth induction sniffer as can be seen: for metal detecting device, usually do not have vehicle from detector sail through the time, the output terminal 6 pin voltage signals of U3 are zero or lower, when vehicle from detector sail through the time, the vehicle approach signal that obtains changing at output terminal 6 pin of U3, the distance of vehicle and detector is near more, the amplitude of this signal is big more, and U6 can collect this vehicle approach signal at its mould/number conversion A/D0 pin.For the earth magnetism amount detector, usually do not have vehicle from detector sail through the time, the output terminal 5 pin signals of U4 are Uc/2, when vehicle from detector sail through the time, the vehicle approach signal that obtains changing at output terminal 5 pin of U4, the distance of vehicle and detector is near more, and the amplitude of this signal changes more greatly, and U6 can collect this vehicle approach signal at its mould/number conversion A/D2 pin.For the earth induction sniffer, usually do not have vehicle from detector sail through the time, earth coil two end signals are zero, the I/O mouth DB0 pin low level input of U6, when vehicle from detector sail through the time, the induced electromotive force signal that obtains changing at the earth coil two ends (vehicle earth induction signal); Carry out signal amplification, filtering and shaping by U5-1, U5-2 and U5-3, obtain one group of pulse signal that comprises at least one high level pulse at the I/O of U6 mouth DB0 pin, the pulse width of this pulse signal is corresponding with the speed of a motor vehicle, vehicle length and the chassis structure etc. of vehicle with pulse number.The variable quantity of temperature sensor is delivered to the A/D1 pin of U6.The little process computer U6 of AVR monolithic by A/D0, A/D1, A/D2 and DB0 pin signal are gathered in real time, computing and time domain amplitude versus frequency characte carry out analysis-by-synthesis and processing, and the result stored or add up, obtain rushing information such as line, vehicle flowrate, road occupancy, down time, DC0, the DC1 of the C mouth by U6 and DC2 pin and I/O carry out SPI standard data or signal transmission, are transferred to application corresponding device or system by the I/O inquiry or by I/O.
As shown in Figure 3, the detector of present embodiment is by enclosure body (11) and housing bottom (12), ear linear magnetic field sensor (21), earth magnetism buncher (23,24), circuit module (9), transmission stube cable (10) and interface socket (20) are formed suddenly.It can detection vehicle be sailed through, close, signals of vehicles data when stopping or sailing out of the sniffer place.
As shown in Figure 4, be the circuit theory diagrams of present embodiment, power supply is supplied with by the I/O interface; Vehicle earth magnetism amount detector by AC suddenly ear linear magnetic field sensor and U1 constitute, AC is SL3501M/TU2, U1 is AMP04; U2 is 16 A/D converter CS5509 of band serial line interface, and it constitutes signal Processing/Logical processing unit; I/O is 9 core serial line interface socket/, constitutes detector transmission interface unit.
According to the principle of work of the above-mentioned vehicle ground quantity of magnetism (magnetic field intensity or magnetic flux) sensor as can be known: usual, do not have vehicle from detector sail through the time, the output voltage signal of ear linear magnetic field sensor AC is less suddenly, the voltage magnitude of the output terminal of U1 (6 pin) is also corresponding lower, and is less through the 16 bit serial data result correspondences that U2 obtains; As vehicle from detector sail through or when stopping, the earth magnetism magnetic field intensity at detector place strengthens, the output voltage signal of ear linear magnetic field sensor AC is along with increase suddenly, also the phase strain is big for the voltage magnitude of the output terminal of U1 (6 pin), the 16 bit serial data result correspondences that obtain through U2 also become big thereupon, external system or device are obtained the resulting real-time serial data result of U2 by I/O, reach to find out vehicle and sail through, close, signals of vehicles data when stopping or sailing out of the sniffer place.
Shown in Fig. 5,6, the detector of present embodiment is made up of vehicle earth coil (1), earth coil skeleton (31), earth coil magnetic core (2), earth coil extension line (3), hold-down nut (32), circuit module wiring board (9), power lead and signal cable (10), enclosure body (11) and case lid (12).
As shown in Figure 7, be the circuit theory diagrams of present embodiment, power supply is by U1, C1, C2,1. and 2. constitute, and U1 is the 78L105 three terminal regulator; Vehicle earth induction sniffer is made of earth coil L and coil induced potential input/treatment circuit, and coil induced potential input/treatment circuit is made up of C3, C4, R1-R6, U2-1 and U2-2, and U2 is two amplifier LM258/358; U3 is the AVR single-chip microcomputer, with U3 is main devices, intelligent signal processing/Logical processing unit that formation is carried out signals collecting, data analysis and processing to detectable signal, R7, Q1 reach and 3. constitute the signal transformation/transmission interface unit of detectable signal with collector output.
According to the principle of work of above-mentioned vehicle earth induction sniffer as can be known: usual, do not have vehicle from detector sail through the time, earth coil two end signals are zero, the mould of U3/number conversion A/D0 pin low level input, when vehicle from detector sail through the time, the induced electromotive force signal that obtains changing at the earth coil two ends (vehicle earth induction signal); Undertaken after signal amplifies by U2-1 and U2-2, obtain an ac voltage signal at the A/D0 of U3 pin, the amplitude-frequency of this signal---time domain specification is corresponding with the speed of a motor vehicle, vehicle length and the chassis structure etc. of vehicle, the little process computer U3 of AVR monolithic by A/D0 pin signal is gathered in real time, computing and time domain amplitude versus frequency characte carry out analysis-by-synthesis and processing, obtain sailing through information such as, stops, the DC0 foot control system Q1 of the C mouth by U3 is in conducting or cut-off state, forms the output of detectable signal collector.Double dot dash line is depicted as the contact output example among the figure.
Claims (10)
1, a kind of earth-buried intelligent vehicle detector, it is by probe unit, the corresponding signal output that is used to finish probe unit is amplified, filtering, shaping, relatively, sensitivity adjustment, ambient compensation, signal A/D is gathered, automatically imitate accurate, logic analysis or to the amplitude of signal, frequency, width, signal envelope amplification speed and time domain specification carry out analysis and judgement and the result are encoded, signal Processing/the Logical processing unit of at least one work in storage and the statistical work, signal transformation/transmission interface unit, power supply and housing are formed, power supply is each element circuit power supply, probe unit is the earth induction sniffer of detecting element and what be used to survey earth magnetism magnetic field intensity/magnetic flux density is that the one kind of sniffer of the earth magnetism amount detector of detecting element constitutes with the magneto sensor with the earth coil by what be used for surveying the earth magnetism changes of magnetic field at least, plug into the respectively respective input of signal Processing/logical process of the output terminal of probe unit, the output terminal of signal Processing/Logical processing unit is connected with the respective input of signal transformation/transmission interface unit.
2, earth-buried intelligent vehicle detector as claimed in claim 1, it is characterized in that, the earth induction sniffer that with the earth coil is detecting element is made of earth coil and coil induced potential input/treatment circuit, the earth magnetism amount detector that with the magneto sensor is detecting element is made of magneto sensor and magnetosensitive signal environment compensation/detection/treatment circuit, and magneto sensor is a mistor, magnetodiode, magnetic transister, 3CCM type magnetic transister, 4CCM type magnetic transister, the magnetosensitive electric bridge, Hall element, integrated magnetic field sensor/module or single shaft/multiaxis monolithic integrated magnetic field sensor/module.
3, earth-buried intelligent vehicle detector as claimed in claim 1 is characterized in that, includes the sniffer that detecting element that two or more are made of identical detecting element or inequality constitutes in the probe unit.
4, earth-buried intelligent vehicle detector as claimed in claim 1 is characterized in that, is provided with a temperature sensing device in the probe unit, and its output terminal is connected with the respective input of signal Processing/Logical processing unit.
5, earth-buried intelligent vehicle detector as claimed in claim 1, it is characterized in that signal transformation/transmission interface unit is provided with at least a output/transmission circuit apparatus of the circuit arrangement of the high-low level/impulse output circuit device, audio signal output circuit arrangement, electronic switch on/off output circuit device, collector output circuit device, photoelectricity isolation and transmission circuit device, standard/non-standard serial/parallel row communication interface/bus transfer circuit arrangement, radio communication signal transmission circuit apparatus and the transmission of optical-fibre communications signal that are used for detectable signal output.
6, earth-buried intelligent vehicle detector as claimed in claim 1, it is characterized in that, be provided with metal detecting device in the probe unit, the metal detection oscillator that metal detecting device is made of metal induction detecting coil that produces alternating magnetic field and the oscillatory circuit that matches with it and be used for detecting or identify voltage magnitude with metal induction detecting coil two ends from the metal detection oscillator, the metal approach signal discriminatings/testing circuit formation of at least a information in the relevant information of induced current by metal induction detecting coil or metal detection oscillator oscillation frequency, metal approach signal discriminating/testing circuit is made up of wave detector/rectifier and comparer/gate, perhaps form by the difference frequency type reference oscillator, metal detection oscillator and difference frequency type reference oscillator constitute double frequency self-heterodyne oscillator, perhaps form by reference oscillator and frequency mixer, the output of surveying oscillator and the reference oscillator respective input of mixer of plugging into respectively, perhaps by reference oscillator, two-way oscillator signal treatment circuit and mixer are formed, the output of metal detection oscillator and reference oscillator one road oscillator signal treatment circuit of respectively plugging into, plug into the respectively input end of mixer of oscillator signal treatment circuit, perhaps constitute by the superheterodyne signal receiver circuit, the metal of metal detection oscillator induction detecting coil parallel with the receiving coil of superheterodyne signal receiver circuit near, the plug into respective input of signal Processing/Logical processing unit of the plug into input end of signal Processing/Logical processing unit of the output of superheterodyne signal receiver circuit, the output of metal signal discriminating/testing circuit.
7, earth-buried intelligent vehicle detector as claimed in claim 6, it is characterized in that, the center of being equipped with is axially arranged with uncovered cavity magnetic core of at least one end or cavity coil rack in the metal induction detecting coil, and earth coil and other part or all of detector electric component are set in the cavity of this magnetic core or coil rack.
8, as claim 1,2,3,4,5,6 or 7 described earth-buried intelligent vehicle detectors, it is characterized in that, each circuit unit in vehicle detector or the sub-detector is arranged to satisfy the module of different needs, or utilize large scale integrated circuit, special IC/module, little processing one-chip computer or digital signal processor DSP that the function of corresponding each circuit unit is organically merged or decomposes, make half integrated or integrated circuit module/wiring board.
9, as claim 1,2,3,4,5,6 or 7 described earth-buried intelligent vehicle detectors, it is characterized in that, signal Processing/Logical processing unit other sub-detector of can plugging into independent case, this sub-detector includes above-mentioned probe unit.
10, as claim 1,2,3,4,5,6 or 7 described earth-buried intelligent vehicle detectors, it is characterized in that, power supply is wired power supply, accumulator or the solar battery group with mu balanced circuit, magneto sensor can be provided with the earth magnetism buncher as required, housing is that the whole plastic packaging of removable stand alone type or detector assembly becomes form, and its profile is cylindrical or oblate.
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| CN 200410010333 CN1707283A (en) | 2004-06-10 | 2004-06-10 | Underground intelligent vehicle detector |
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| CN 200410010333 CN1707283A (en) | 2004-06-10 | 2004-06-10 | Underground intelligent vehicle detector |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458867C (en) * | 2007-04-17 | 2009-02-04 | 中国科学院计算技术研究所 | Method and device for implementing classification of vehicle and bicycle |
| CN101908278A (en) * | 2010-08-09 | 2010-12-08 | 北京交通发展研究中心 | Wireless magnetic induction intensity vehicle detection method and device |
| CN102324188A (en) * | 2011-07-15 | 2012-01-18 | 广州市捷众科贸有限公司 | Buried parking space detector |
| CN102521891A (en) * | 2011-12-06 | 2012-06-27 | 北京万集科技股份有限公司 | Method and system for detecting vehicle congestion at toll station |
| CN103116133A (en) * | 2013-02-03 | 2013-05-22 | 苏州市职业大学 | Traffic load pavement vibration energy piezoelectric power generation measuring method and system thereof |
| CN103150929A (en) * | 2013-03-05 | 2013-06-12 | 桂林飞宇电子科技有限公司 | Magnetic field sensor-based vehicle parking state detection system |
| CN103440765A (en) * | 2013-08-30 | 2013-12-11 | 深圳市捷顺科技实业股份有限公司 | Detecting method and device for vehicle |
| CN107192989A (en) * | 2017-06-13 | 2017-09-22 | 电子科技大学 | A kind of microwave radio receiver |
| CN107689160A (en) * | 2017-09-27 | 2018-02-13 | 松沐科技（北京）有限公司 | Underground traffic lights and preparation method thereof |
| CN110987146A (en) * | 2019-11-03 | 2020-04-10 | 武汉光谷航天三江激光产业技术研究有限公司 | Optical fiber sensing self-difference receiving device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458867C (en) * | 2007-04-17 | 2009-02-04 | 中国科学院计算技术研究所 | Method and device for implementing classification of vehicle and bicycle |
| CN101908278A (en) * | 2010-08-09 | 2010-12-08 | 北京交通发展研究中心 | Wireless magnetic induction intensity vehicle detection method and device |
| CN101908278B (en) * | 2010-08-09 | 2013-12-18 | 北京交通发展研究中心 | Wireless magnetic induction intensity vehicle detection method and device |
| CN102324188A (en) * | 2011-07-15 | 2012-01-18 | 广州市捷众科贸有限公司 | Buried parking space detector |
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