#vehicle detector

[fionayao2008]

Tripod Turnstile Overview Tripod Turnstile, Swing Turnstile, as well as Flap Turnstile( RS Security Co., Ltd: www.szrssecurity.com) are contemporary control tools for pedestrian flows. They are utilized in position where the entrance and leave of people require to be managed, such as clever communities, canteens, resorts, galleries, gyms, clubs, trains, terminals, docks, and so on area. Making use of Tripod Turnstile, Swing Turnstile, as well as Flap Turnstile can make the flow of people organized. Tripod Turnstile, Swing Turnstile, Flap Turnstile are utilized in mix with smart cards, finger prints, barcodes as well as other identification system devices to develop an intelligent access control network control system; they are utilized in mix with computer systems, gain access to control, presence, charging monitoring, ticket systems and various other software application to create a The smart Turnstile Gate detailed management system can understand functions such as gain access to control, presence, consumption, ticketing, and present restricting. This Turnstile Gate administration system becomes part of the "all-in-one card" and is installed at passages such as neighborhoods, manufacturing facilities, wise buildings, canteens, and so on. It can finish various management features such as staff member card travel control, participation at get off work and dishes, and also dining. Tripod Turnstile system features Fast and also hassle-free: read the card in and out with one swipe. Utilize the authorized IC card as well as wave it in front of the clever Tripod Turnstile reader to complete the Tripod Turnstile gate opening as well as fee recording work. The card analysis is non-directional as well as the analysis and composing time is 0.1 secs, which is hassle-free and also fast. Protection and confidentiality: Use background or regional verification, authorized issuance, and also distinct identity, that is, the card can only be utilized in this system, and it is personal as well as secure. Dependability: Card radio frequency induction, stable and dependable, with the capacity to court as well as believe. Versatility: The system can flexibly establish entry and departure control employees permissions, time period control, cardholder credibility as well as blacklist loss coverage, adding cards and various other functions. Convenience: Through consent, the user card can be used for "one-card" monitoring such as car park, presence, access control, patrol, usage, etc, making it easy to recognize numerous uses one card. Simpleness: Easy to mount, simple to connect, the software application has a Chinese user interface and is easy to operate. Tripod Turnstile, Swing Turnstile, and Flap Turnstile( RS Security Co., Ltd: www.szrssecurity.com) are modern control gadgets for pedestrian flows. The usage of Tripod Turnstile, Swing Turnstile, as well as Flap Turnstile can make the circulation of individuals orderly. Utilize the licensed IC card and also wave it in front of the wise Tripod Turnstile reader to complete the Tripod Turnstile gate opening and fee recording work.

[ezcyberquestinc]

Vehicle Detectors

New Post has been published on http://ezcyberquest.com/vehicle-detectors/

Vehicle Detectors

These sensors will detect vehicles only (magnetic detector of metal vehicle passing by). The sensor lies (or is buried) on one side of the driveway and has a wire that goes to the transmitter box. Generally the sensor and wire are buried the distance to the transmitter box. If buried, the detector / sensor are not visible at the driveway entrance. For more information visit our driveway alerts page.

[partition-diet-fitness-p-gif]

Metal Detectors €”A Kind of Commonly Down the drain Products

It is widely known that there is a famous detector named Sherlock Holmes goodwill the books written among Arthur Conan Doyle. And Sherlock Holmes is a legendary character who can detect many subtle and perennial clues which are neglected by cloak in numerous cases. However, have you continually imagined that coordinated unprepared technology hind end be wasted to inspect metals since if Sherlock find out clues air lock our real life? The imagination comes true, for metal detectors are invented and has been put streamlined spacious use.<\p>

Noble metals error detector is known from euonym only that it is ablated for detecting metals. It develops into several categories of meeting specified requirements such as assets detector, vehicle detector, adviser frequency detecting number, detector touching bulwark, walk-through chevron calorimeter, handheld faradmeter thermostat, underwater perusal system, X-ray screening prearrangement, etc. At all costs multifunction, metal detector can perceive gold, vehicle decomposition, radio signals, food and medicine safety, submarine involvement and hail other things. Therefore, it is as a whole used incoming various places affection airport, track station, rack-and-pinion railroad farmery, car service center, naval kilowatt, post, jewelry manufacturing factory, canvassing room an so onward. <\p>

As we know, with the fast progress of being alive standard and immoderate technology, we human beings are getting increasingly mistrust about our physical needs, human safety and future progress. For instance, taking value-keeping and traditional factors into account, people in cunning countries burn more resolution vice gold than those of other countries did. And inside these countries, gold detectors are twentieth-century great need; Cranky people and units will choose radio frequency detector as their favorite so as until protect their privacy in current society where personal and confidential prosecution is easily open as day; As mortal safety and public ministry, walk-through, handheld and X-ray screening detectors are one of the most widely used detectors regard places including public places as quite as indwelling places such insomuch as airports, import tax railway and tram stations, bodega, kreis units, respective buildings or villas. Inner self is not an easy turn over to park just the usages in relation with metal detecting machines out, because when there is a claim for ultrasonic detector matching unique request, there willpower arrange one to be created. At this moment, it is undeniable that copper detectors are one on the routinely used products our world can't live after. <\p>

Having shift into a product of extensive use, spread eagle detectors are on their way of refit improvement. And we can't forswear that it is customers' only too and catch so as to social convention oneself properly. Meanwhile, because detector manufacturers, it is furthermore their action to produce products on unlimited quality and cheerful mechanics. As a professional detector wholesaler, we take care of wide world kinds of metal detectors for your better choice in http:\\www.detectorall.com. All our products are possessing good quality, sound price and best service which enjoy a great noteworthiness among customers.<\p>

[boncostick-blog]

The vehicle detector with authentication function of the style is designed in ETC

Foreword

With the development of economy, no charge system (ETC) of parking Have already risen in our country quietly. Park charge system by communication, control, charge 3 large-scale systems make up mainly. An important link of reliability service of the overall system is a vehicle detector. It to measure, drive towards the intersection of Communication and vehicle of area and order aerial goes on the sensor of Communication in the charge system in park, function of entering detection, detection of speed, style and differentiating etc.; It is the sensor that the judgement of detecting the vehicle which leaves the area of communication, foundation ETC lane control device controls the railing, road side display unit, enter and measure the function; It measures the vehicle to pass, controls and removes it to the display content of the road side display unit of this vehicle and expicity function that directs against the subsequent vehicle of control, and order the function closed of the railing.

In view of factors such as the characteristic, price, technological complexity, reliability, maintenance requirement, applicable scope,etc., this kind of vehicle detector of ours is based on the coil principle of the earth inductor and develop.

A dynamic vehicle of detectors are designed

1.1 The system succeeds

A dynamic vehicle of detector system block diagrams of Fig.

Fig. 1 is a dynamic vehicle detector system block diagram. The earth inductor coil links with acceptor through the feeder, when the ferromagnetic car body pass the earth inductor coil, convert the change of inductance quantity to the change of the frequency through the acceptor. The one-chip computer is a core of the overall system, counts through the counter of the one-chip computer, read data produce present frequency promptly, obtain the intersection of frequency and variation tendency, require compared with reference frequency thus judge whether buses come according to present various parameter constantly, it is for the ancillary equipment to use to output different status signals finally. The upper computer gathers to the frequency variation value and forms the frequency curve of reaction to use for the style and differentiate through the serial port RS232 at the same time.

In order to guarantee the Apparatus under the environment of abominable noise interference of highway scene, can work normally and reliably for a long time, has specially designed watchdog's circuit of the hardware, fast self-booting resume working to make it guarantee the Apparatus after crashing. At the same time while the detector ran for a long time, if operating frequency went beyond certain range and reset through the reset circuit, in order to carry on frequency regulation again. The indicating circuit of state is used for pointing out the information of vehicle instrumentation, the device runs with the Communication information of the network, job status information of the detector,etc..

1.2 Detection circuit of dynamic vehicle

Dynamic vehicle instrumentation schematic circuit diagram of Fig. 2

Fig. 2 provides the dynamic vehicle instrumentation schematic circuit diagram. The whole circuit is that band elimination filter, in-phase DC amplifier, sluggish comparator circuit and undulate shaping circuit by the acceptor, from making up with band pass and adder make up Obtaining the survey accuracy of direct influence of reference frequency, if the oscillating frequency of the acceptor is lower, when different kinds of vehicles pass the earth inductor coiling, the undulate shape of the outcoming signal of the acceptor does not change much, only the faint change that causes because the overhead level of vehicle chassis is different exists. Reduce survey accuracy greatly so, make, judge result that vehicle pass error very much loud. Design adopting the bikini resonator of capacitive feedback in dynamic vehicle instrumentation schematic circuit diagram of this picture 2, design the initial reference frequency of the circuit about 100KHz, operating frequency is very steady among 100KHz- 160KHz, can well satisfy the intersection of Ministry of Communications and fixed applicable scope of coil ' 10Uh- 2200Uh) .

2 systematic software design

This system adopts AT89C51 one-chip computer, EPROM that has 4KBYTE on-chip can be programmed repeatedly, and easy to operate, it is easy to develop debugging and produce in batches. We choose the Jingzhen of 11.0592MHz.

Frequency at present 2.1 is obtained

Set up a timer in the main program, regular cycle is 8ms, regular time reaches touching off timer interrupt Timer1Int, in the interrupt service routine, is reading and shaking counter value at present constantly, and in the independent variable kept to Counter.

2.2 Reference frequency is revised

The acquisition of reference frequency is more complicated. Because of the influence of the environmental factor, various external interference will cause the reference frequency of the same coil to change, make the reference frequency value of the coil unfixable, it is a time variant parameter. Reference frequency mainly changes toward two directions: Lead to the fact on one hand winding inductance quantity increases because of changing in external condition, make actual reference frequency wane, it is waned that the frequency is corresponding too at present at this moment. In this case, the frequency is being waned slowly at present, and if reference frequency maitains unchanged, the difference of such two values will be less than the threshold value that is presumed, can not measure the arrival of the vehicle.

On the other hand, lead to the fact because of change of the external condition winding inductance quantity is reduced, thus cause the increase of the frequency, and there is increase that cars will cause the frequency while passing, two similar situation these, take measures, produce car, come and judge, get situation that bus come on cause the intersection of detector and false drop. Revising reference frequency until we must be constant in being that system run course. Reference frequency revises the algorithm flowchart and is shown as in Fig. three. This algorithm changes toward two directions and revises separately according to the frequency while having cars to come.

The reference frequency of Fig. 3 revises the algorithm flowchart

2.3 style is discerned:

In park in the charge system, we replace the traditional partial automatic charge system of manpower with the automatic charge system. The automatic charge system will need a lot of new and high technology, among them a piece of the most crucial technology is how to measure the actual vehicle type by confirming the expenses standard. We select to use earth inductor coil as the sensor, combining the fuzzy algorithm for pattern recognition will pay classifying to the vehicle.

3 conclusions, this system, have adopted many kinds of software and hardware anti-jam measures, and can revise reference frequency in real time, characteristic such as being high of strong, measuring rate with stable characteristic of making the system have real-time nature, have basically met various requirements for ETC system. In addition adopt the identification solution of fuzzy pattern, better recognition experience of utilizing people, sum up people's experience into an inference rule, by deducing to finish the course discerned instead of calculating. Such unique advantages as the use of the identification solution of fuzzy pattern gives full play to the low-cost, high reliability in the taxis system of the earth inductor coil, simple and convenient. Can also apply it to different occasions such as the car parking through changing various parameters such as threshold value.

Bibliographical reference:

[1]Huang XianWu [waits for ] writes. Actual application circuit design of the sensor [M ]. Electronic publishing house of University of science and technology

[2]Zhang YiGang Peng XiYuan Tan XiaoYun Qu ChunBo. MCS-51 one-chip computer employs and designs [M ]. Harbin Polytechnic University Publishing House

[3]Gao Jian Shen QingHong Gao GuoTang. Research and realization [J ] of vehicle detector Apparatus in ITS. Traffic and computer 2002 .5( 20) : 15-17 [4 ] Sun GuoDong Jiang YongLin The roof beam arises. Design and realizing [J ] of the intellectual toroid vehicle detector. Microcomputer information 2003

. 19( 9) : 54-55 [5 ] Yu Lian fuzzy pattern cognition and fuzzy image manipulation and two-shot research and application [D ] to deduce theory: 1997

[6]Zhang WeiGang The chaste tree is suitable Research [J ] that the laser style differentiates. Transaction of university of highway Communication of Xi'an 1999. (4): 101