Detector is a device for observing and recording particles,nuclear physicsAnd particle physics experimental research.Detectors can be divided into two categories:CounterandTrack detector。
metal detectorUsing the principle of electromagnetic inductionalternating currentThe coil passing through generates a rapidly changing magnetic field.
Chinese name
detector
Foreign name
detector
Interpretation
It is a device for observing and recording particles
Properties
equipment
Purpose
Experimental Research on Nuclear Physics and Particle Physics
Detector（detector）It can be divided into two categories:CounterandTrack detectorNext, we will introduce them in detail.
Counter
With ionization chamberProportional counter, Geiger Miller counterScintillator detector、Cerenkov counter、Semiconductor detectorwait.It is mainly used to record the number/strength of particles and convert the energy information carried by particles into corresponding sizeelectrical signal。The counter is generally required to have certaintime resolution , that is, the distinguishable time when two particles successively enter the counter.Generally, the counter is often connected with the calibration circuit andCoincidence circuitJoint use.
The calibration circuit is a circuit that uses pulse counting system. Through the combination of counter and calibration circuit, particles can be counted quickly;A coincidence circuit is one that connects two or moreCounter tubeCooperated with electronic circuit, it can record only those particles that make the counter work together, while not reacting to the particles that only make one counter work, so as to record the particles to be searched.
Ø Specially used for meat, fungicandy, beverages, grains, fruits and vegetables, dairy products, aquatic products, health products, additives and condimentsFerrous metalas well asNonferrous metalDetection of impurities.
Ø Used for chemical raw materialsrubber, plastics, textiles, leatherchemical fiberDetection of metal impurities in toys
Ø Used for detection of metal impurities in medicine, health care products, biological products, cosmetics, gifts, packaging and paper products
2. The use of German automatic filtering technology (phase adjustment technology) can effectively suppress the product effect;It can detect products with large product effects, such as frozen food, meat, ricePickled productEtc;
3. With intelligent setting, the device can automatically set the best sensitivity suitable for the tested product, and the operation is simple and convenient.
4、memory function Function: save the best sensitivity, the next test can be directly tested, and the test parameters of more than 50 products can be stored;
6. Detectable ironstainless steel, copper, aluminum, lead and other metal materials
7. Flexible digital sensitivitycontrol mode And various advanced manual setting functions;A variety of specifications can be selected to adapt to different materialsdetection sensitivity requirement;
8. All stainless steelSUS304Manufacturing, high-grade protection motor for selection;
9. Highest IP69Protection grade；The line part is built inside the detector head to reduce the outsideEnvironmental corrosion，operation panel . The motor box is double waterproof, suitable for particularly harsh working environment;
10. The simple detachable rack is convenient for users to clean;Conveyor beltThe special design of,
11. A variety of exclusion methods are available;Precise elimination control ensures reliable removal of foreign matters with minimum material waste.
safety-check
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detector
safety-checkIt is a detection device for detecting whether personnel carry metal objects, also known asMetal detection door。It is mainly used in airports, stations, large conferences and other public places with large crowds to check metal objects hidden on people's bodies, such as guns,Control toolEtc.When beingInspectorsWhen passing through the security gate, the metal carried on the human body exceeds the preset value according to the weight, quantity or shapeParameter valueThe security gate will immediately give an alarm and display the location of the metal causing the alarm, so that the security personnel can find the metal objects carried by the person in time.What fields can security gates be applied to?
Applicable to production enterprises: including electronics (such as chip, memory, circuit board, hard disk, mobile phone, MP3, YiyitongRecording pen、electronic deviceEtc.)Wire and cable, electrical appliances, gold and silver jewelry, cigarettes, drugsInk cartridge, industry and miningHardware products, electroplating, die casting, plumbing equipment, precious metals (copper, aluminum, etc.) and their processing industries.
Applicable public places: including stadiums and entertainment places（discotheque, dance halls, etc.), airports, railway stations, bus stations, ports, exhibition halls, museums, banks, oil depots, power stations, etc.
Why do we need a security gate?
Productive enterprises: prevent theft
The prices of precious metals (such as copper, aluminum, tin, nickel) and other raw materials have risen sharply, resulting in the related industries such as hardware, electroplatingElectronic appliances、Wire and cable、Mechanical castingThe cost of finished products, semi-finished products and parts has risen sharply. Because these precious metals are so expensive and there are many recycling points, some ill intentioned employees have the opportunity to take advantage of it. In order to prevent the loss of precious metals, the enterprise tries every way to prevent and reduceMetallic materialsLoss.Practical proofThe application of the security gate in the factory can be scientific, objective, humanized, and effectively play the role of prevention and deterrence.This is because the security gate has the following features: high detection accuracy, adjustable, objective, and nohuman factorDisturbance, no body search, respect for employees, fast speed, easy control and other characteristics.
In these places, there are many people, oftenOutlawCarry knives and gunscontrabandSeize the opportunity to commit crimes, resulting in heavy casualties andproperty loss, causing extremely badnegative effect。In order to put an end to such terrorist events, scientific management should be accompanied by scientific and effectivemanagement toolbe imperative.andsafety-checkIt is one of its most effective tools. It has been widely used in airports and other importantSafety facilitiesIn order to preventterrorist attack, after a long timePractical test, one of the most effective security tools.
Principle of security gate:Crystal oscillatorGenerate 3.5-4.95M sinusoidal oscillationfrequency divisionThe divider is about 7.8Ksine wave, viatriodeAfter power amplification with the coil, input it to the large coil of the door panel (zone 7)electromagnetic waveTransmit and receive by the coils in the 1-6 areas of the door.After receiving, compare the received signal with the reference signal, and change theAcquisition cardOutput level，CPUScan the data of 6 location acquisition cards within 300ms, judge the location of metal and output the display.
structure
detector
1. Door plate structure: composed of 1 large coil, 6 small coils, compensation coil and graphite.
During detectionWorkflow: CPU detection → one set of infrared is blocked → detect whether the data of each acquisition card changes → alarm → detect another set of infrared → reset and re detect.
principle
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The metal detector uses the principle of electromagnetic inductionalternating currentThe coil passing through generates a rapidly changing magnetic field.thisMagnetic energyCan be induced inside metal objectsEddy current。Eddy current will generate magnetic field again, which will affect the original magnetic field in reverse and cause the detector to sound.
In the field of wararchaeologyMost of the exhibits are metal, such asMusketWarheads, cartridges, bullets, artillery and shellsshrapnel And/or swords, etc., depending on the historical period of the battle.Therefore, the battlefieldarchaeologistThe most important tool is a simple metal detector.
For decades, it has been taken for granted thatGrave robberThe "weapon" and metal detector have been criticized.Until 1983, Richard Fox and later Douglas Scott proved that decades of hard archaeological work could be completed in a very short time through systematic metal detection and investigation through their analysis of the Little Big Horn Battlefield.According to their estimation, metal detectives may only find about 10 of the 5000 ancient artifacts unearthed in the small and big corner battlefield in the traditional way.
Today, skilled metal detectors, together with archaeologists and cultural relic protectors, play a very important role in battlefield archaeology. Cultural relic protectors are responsible for accurately recording the location of artifacts found, and carrying out "packaging, labeling and marking".In other words, each ancient artifact is sealed, labeled, and placed in the hole dug when it is dug out, so as to find out its exact location and draw a map before removing it for future research.
Metal detectors are increasingly used to assist surface penetrating radar (SPR) and othersGround Penetrating Radar SystemWork.Initially developed by Britain, the SPR system for detecting plastic mines can locate abnormal objects 30 meters below the surface.The system can also provide a series of clues to help users identify evidence that has not yet been dug up.
detector
But even if we find the location of the metal artifacts, it is only half the success.Sometimes, metal artifacts are only half of their original appearance.In the mid-1990s, during the Battle of MonmouthAnalysis processIn China, American archaeologists found that many musket bullets with mottled surfaces were pressed likeChewing gumSame thin.In order to determine the original size, an archaeologist named Dan Sivilich, who was an engineer, invented a formula that combines physics and chemistry to calculate the original diameter of any non spherical firearm warhead.It (rightly) is called "Sivilich Formula", and now it is used every day in battlefield archaeology around the world.
Once the original size of a deformed or incomplete gun or bullet is estimated,BallisticsExperts will join in and begin to calculate the range of artillery fire.[1]
Underground metal
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detector
Underground metal detectorIs an applicationadvanced techniqueIt has wide detection, accurate positioningResolutionStrong and easy to operate.Metal detectors are mainly used to detect and identify buried metal objects.In addition to its military application, it is also widely used for security inspection, archaeology, prospecting, and searching for scrap metal. Also known as "iron detector"Waste recyclingThe underground metal detector adopts sound alarm and instrument display,Probing depthIt has a great relationship with the area, shape and weight of the metal to be detected. Generally speaking, the larger the area is, the more the quantity is, and the greater the corresponding detection depth is;On the contrary, the smaller the area and quantity, the smaller the corresponding depth.The maximum detection depth listed in the following table is based on the productEnterprise standardA 60cm * 60cm * 0.5cm aluminum plate is buried in dry soil.
Main functions:
With ground balance line, it can eliminate“Mineralization reaction”The influence brought by this has greatly improved the effective detection depth andAccuracy；
Have differencesferrous metalAnd non-ferrous metal functions;
Adopt intelligent operating system;
Encapsulated with high-strength ABC materials, it is light in weight and long in life;
Metal sounds can be recognized through headphones.
Handheld metal
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Hand held metal detector
Hand held metal detectorDesigned to detect metal objects carried by people or objects.It can detect weapons, explosives or small metal objects carried by people or in packages, luggage, letters, fabrics, etc.The special appearance of its sensitive surface makes it easy to operate.It is superior to the ring sensor type hand probe.Ultra high sensitivity, special application.Such as prison, chip factory, archaeological research hospital and other technical characteristics
1. This is a detector of inductive transmission charging technology for high-end places.
2. The product structure design is novel, and the details such as operating habits and hand holding parts are kept improving.
3. The detection working face is large and uniform, with ultra-high sensitivity, simple and convenient operation, and no missing report.
4. There is no need to adjust the detection sensitivity. There are two sensitivity options, high and low, and the film can be touched lightly.
5. One button operation switching of audible and visual alarm and vibration alarm can also be customized according to customer demand for silent alarm (optional).
6. Hands on the anti-skid technology of the department, user-friendly.
7. It breaks the traditional plug-in charging mode, adopts the world's advanced induction transmission charging technology, and has independent intellectual property rights.
Tedun MD-3003B1
1. It is easy to operate and equipped with a leather case, which is convenient to carry.
2. Commonly known as "plate type" detector, it has a large scanning area to prevent missing reports.
3. With charging function, direct charging and seat charging options.
4. When the voltage is not enough, the indicator does not light up or a value alarm prompts.
5. There are double selection modes of sound light and vibration alarm functions.
6. In the case of undetermined demand, it can be switched through the automatic reset function switch, thus eliminating small items.
7. Users can flexibly adjust the high and low sensitivity according to the security check.
Function improvement
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detector
In addition to the basic detection and alarm functions, the current metal detectors generally provide many elaborateSpecial functions, such as:
The function of surface balance: to facilitate the machine to correctly compare whether metal objects are found instead of interference;
Selection function: use the different characteristics of different metal objects in response to the magnetic field to select or exclude different types of metal objects and give an alarm;
Depth indication: it can tell the possible depth of the detected metal object buried;
Area indication: it can display the size of detected metal objects and provide operators to study whether they meet the requirements of excavation;
Voice prompt: you can immediately useVoice reminderOperators, such as lighting - provide lighting for night operation.
Space detectors are divided intoLunar probe、planetary and interplanetary probe , small object detector and other space detectors leaveEarth timeMust obtain enough speed to overcome or get rid ofGravity of the earth, implementdeep spaceFlight.Detector along withEarth orbitTangent to the orbit of the target planetcenter of the sunElliptical orbit(Double tangent orbit), it may meet the target planet;Increasing the speed to change the flight orbit can shorten the time to reach the target planet In order to ensure that the target planet will also run to the place where it is tangent to the target planet orbit when the detector flies along the double tangent orbit, the detector must be launched when the Earth and the target planet are in a specific relative position.The probe can use the planetgravitational fieldThe remarkable feature of accelerating the continuous flight around multiple planetary space probes is that long-term flight in space cannot be carried out on the groundReal time remote control, so must haveautonomous navigation Capability;towardsExtrasolar planetsFlight, away from the sun, cannot be usedSolar cellArray, but must use coreenergy system；Bearing a very harsh spaceenvironment condition, special protective structure is required;On the moon orPlanetary surface landingOr walking, which requires some special structures,
The space probe isArtificial earth satelliteIt is developed on the basis of technology, but compared with man-made earth satellites, space probes have some significant technical features
The space probe flew hundreds of thousands to hundreds of millions of kilometers away from the earth. When entering orbit, the speed and direction were slightly wrong, reaching the targetPlanetary timeThere will be large deviations, such asMars probeWhen entering railSpeed error1 m/s (about one ten thousandth of the speed), the distance deviation when reaching Mars is about 100000 km.Therefore, precise control and navigation must be carried out in the long flight.Flying to the moon usually depends on the ground TT&C network and space probeTrack controlControlled by the system (seeSpacecraft orbit control)。The interplanetary flight distance is far, the radio signal transmission time is long, and real-time remote control cannot be carried out on the ground, so the orbit control system of planetary and interplanetary probes should have autonomous navigation capability (seeInterstellar navigation and control）。For example, the United StatesPirate detectorMore than 800 million kilometers of space flight took 11 months to make more than 2000 autonomous orbit adjustments, and finally achieved a soft landing on the surface of Mars, with a landing accuracy of 50 kilometers.In addition, in order to ensure the accurate working attitude of the orbital control engine, the communication antenna is always aimed at the earth and other systems work normally, the detector also has an autonomous attitudecontrol ability，[2]
