The main aim of the project is to detect the metal near by to the sensor. Whenever the metal is brought near the sensor (inductor) a buzzer is produced from the speaker and whenever the metal is removed the sound is switched off. As the magnetic flux passes through the some opaque. PDF | Humanitarian demining is a matter of high interest, but metal contamination and magnetic soils reduce the sensitivity of metal detectors. The soil. METAL DETECTOR. K ILLUSTRATED ASSEMBLY MANUAL. HIP. Total solder points: Difficulty level: beginner 1 □ 2 □ 3 ☑ 4 □ 5 □ advanced.
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The following paper is both informative and helpful for metal detector users with an interest in insight into the basic theory and electronics of metal detectors. You don't need to understand all the science of how a metal detector finds instructions supplied by the manufacturer and has his metal detector turned on. more! Quick Navigation. Why do people go metal detecting? 2. How To Get Started Metal Detecting. 5. What is the best metal detector? 8. Where to Metal Detect.
If more metal is detected during the rejection time, then the rejection time will be increased accordingly. The shift time can be set between 10 ms to ms. The acknowledgement can also be carried out by a super ordinate control.
The lowest required height should be selected feeding only the carrying run through the search channel. SHOCK MOUNTS The metal detector comes with four factory-installed shock mounts to lessen the effect of belt structure vibrations on the metal detector and to isolate the metal detector electrically from the belt structure. The metal detector is attached to a separate console or to the belt frame using the shock mounts.
This decreases the aperture width and height by approx. Not included in this are the belt structure not the cross connections within this structure and any included search coil console.
Remember if you walk thru will not detect this you are not going to hand wand the person and this threat is coming into your building. I saw this happen when a women hid an exacto blade in her bra and when the judge sentenced her she started cutting herself. The Judge was very upset and wanted to know how this blade got in his courtroom and that is we got to remind him about how he would not let us raise the sensitivity of the walk through metal detector to detect this exact type of threat.
Cuff key A Cuff is a must have test object if you are in a facility that handles prisoners.
You DO NOT want this getting into your courtrooms and you need to make sure you can detect this type of threat. The honest to goodness truth is that your walk thru metal detector is not typically going to be able to detect this so you would again never hand wand it is coming in. They do manufacture walk thrus with very high sensitivity prison units that can detect a cuff key so if you do not want this in your facility you need one of those units.
The very common walk thrus that you see in most facilities cannot detect a cuff key. There are different types but the most common and hardest to detect is below: Blasting caps have very little metallic content and are very hard to detect in a walk thru metal detector. They come is 3 different types based on their metal content and sizes, Electrical copper and aluminum caps and non-electrical aluminum caps.
Step 2: Get the Hand Wands to Test: Trying to get all these units to test is easy and you just need to contact the manufactures and tell them you want a unit to test. If they say no well move onto the next guy because when it comes to hand wands there are a ton of manufactures. You can also call around to your fellow Security Professionals and borrow one of their units to test. There are about 10 or more hand wands on the market so try and test as many as possible can so you get a very good sample size.
Step 3: Conduct the testing: Make a checklist of all of your items and run your test for each hand wand. The reason you want to know this is because when you download a hand wand the minimum distance that it detects all of your test objects in the distance you MUST tell your officers to hand wand a person put this in your Post Orders.
The key here is to repeat the test the exact same way each time and I recommended a minimum of test per test object to verify you get the same response. Most people do not know this but you need to test the hand wand against the test object at the following locations: Back of the Paddle 2. Middle of the paddle 3.
Top of the paddle Hands wands will have varying levels of detection on the paddle and typically the top of the paddle you have to get closer to the object to detect. The can play a role in you scanning distance you put out to your Officers based on how the unit you selects performs. If you do not know this and your guys are scanning 2 inches away from the person, and the top will only detect at one inch you could miss a threat.
If you really want to see how the unit match up build an inexpensive test rig so you can measure the distance the threats alarm.
Metal Detector-Project Report
All you need is about 3 foot of a 2X4 and wooden ruler and some rubber bands. The below is the test rig I used to do my testing and it worked great. You will find that almost all of the units on the market can detect all of the test objects but some of them will have a hard time with the very small items i. I have tested most units and found that the less expensive models you have to get under 1 inch away from the very small threats to detect.
Once you have completed the testing you can now factor in the different features on the units.
As you get more features like vibration or a pin point capability the cost increases drastically. You will also find that the lower cost units are not built as rugged as the more expensive ones.
You just need to make a decision based on your needs and the threat you are trying to detect. Once you know which ones can detect the best you can factor how much you are willing to spend for the detector? Also do not get too wrapped up about a unit with pinpoint capability.
I have tested many units and most can detect from the tip Pinpoint. You can shop around as there are a ton of companies that sell hand wands and you can get a good price by checking with each one. I have found that I can typically get them to come down if I show them the same unit from another company for less. The most important thing you need to remember is that there is a diehard relationship between your hand wand and walk through metal detector.
They work together and the walk through is what tells your officers they need to hand wand a person.
1200 metal detectors.pdf
If you walk thru will not detect the items you do not want coming into the building you have a very serious problem that you need to get fixed. We can help you with you walk through settings and hand wand testing and even provide you training.
Get into contact with us at the below and we can get you headed in the right direction and improve your ability to detect threats at your checkpoints. Download pdf. Remember me on this computer.
Enter the email address you signed up with and we'll email you a reset link. In the future we hope that prices will fall when the efficiency for mine we will use simple explosive simulants such as beeswax, detection will be proven and when the manufacturers will paraffin or nylon, or Dow Corning RTV and realize the potential market available.
A GPR for landmine detection must have a wide fre- quency band to achieve a good resolution, but since 4 cm 2 cm 3 cm 3 cm higher frequencies do not propagate well, the chosen range is always a tradeoff between resolution and penetra- Metallic tion depth.
Smaller mines might require correspondingly shorter wavelengths, which will Figure 3: The 3 objects used for initial comparative tests shorten the usable depth range too. Its sam- pling head is able to acquire a maximum of A-scans, ity and is not sufficient for antipersonnel mines image of points each, per second or A-scans of analysis. Affordable GPR software for real-time applica- points in coarse mode with 16 bit resolution and a maxi- tions seems not to be available on the market.
Systems mum equivalent sampling rate of 40 GHz 25 ps time res- developed for military use are often mentioned, but are olution. The to be written. In the first part of the project, we have acquired data is buffered in two FIFOs able to store one chosen to focus on the Reflex off-line processing pack- A-scan each and is displayed in real time as a scrolling B- age written by Sandmeier , which is of seismic data scan on the LCD screen of a rugged , 66 MHz PC.
Several modules are available for data analysis display of B-scans, 1D and 2D filters, special A prototype resistively loaded parallel dipoles antenna purpose functions like migration and data interpretation has been used for our acquisitions size: The pulse generator pulse width: We are using it mainly to etition rate: This an- gorithms.
To test algorithms not included in Reflex we tenna has a nominal bandwidth of MHz to 2. This interactive system allows us to evaluate all steps of the data processing chain. Data Collection, Format and Availability Data Visualization and Interpretation In the first part of the project, all our acquisitions are done in our sand box. All data are directly stored Different visualization techniques are being evaluated to on the internal hard disk of the GPR and after that, find the most suitable one, from a practical and compu- files are transferred to a separate PC for data analy- tational point of view.
One has also to bear in mind that sis. Most of them are freely available on Internet at in the demining case GPR data will have ultimately to be http: A brief description of the experimental con- ditions is given for every file as well as a complete de- Line or B-scan: All these data are stored in one database and one, being similar to what is currently done with metal de- serve as input for algorithm evaluation.
Metal Detector-Project Report
As we are looking for the real shape of the buried targets, a reliable position in- Amongst the current available files we have chosen to use formation must be provided to the system to compensate the data corresponding to the three objects shown in Fig- for the non uniformity of the displacement. After a sus- ure 3 for an initial comparative study of the GPR versus picious region has been detected, it may be necessary to the metal detector.
A stone has been chosen because it pass over it again to get more information for a more so- could be hard to distinguish it from a mine with a GPR; phisticated but slower recognition algorithm.
The mini- the debris for the same reason in the metal detector case. But in other types of soil with higher attenuation we expect that this distance Software embedded in the radar is limited to some basic must be lowered.
In order to improve the nition process, pulse deconvolution and migration algo- resolution we take a second set of measurements orthog- rithms will be necessary to transform the target response onally to the first one.
The area of a minimum metal AP into a more compact one. We are still looking for a robust mine of diameter 8 cm is therefore covered by about 40 A- and fast algorithm which must be able to work on clut- scans.
Figures 6 and 7 show images of the previously used tered images. As soil characteristics plays an important objects. Their circular nature can be clearly seen and, as role in the migration aperture, it will also be useful to de- no migration has been applied to the data, they obviously velop an adaptive algorithm.
Figures 4 and 5 are examples of B-scans showing the Volume or 3D imaging: The mine does not exhibit a clear hyper- the operator to visually correlate neighbouring images. A bola shape as in the case of the stone, which could be true 3D representation seems to need too much computer due to the fact that the layers of materials inside the mine power for an embedded application and is not necessarily produce interfering echoes.
The metallic debris does not helpful for automatic recognition. Data Processing Several unwanted components of the received signal, such as random noise or clutter, must be removed to im- prove the quality of the image of a target object.
Random noise, i. Different types of lowpass filters can be used to reduce the clutter response caused by irregular- ities in the ground surface. The background component of the image must be re- moved too, given that we have to detect objects which Figure 4: B-scan of an AP mine in sand.But in other types of soil with higher attenuation we expect that this distance Software embedded in the radar is limited to some basic must be lowered.
Page 3. KG Edition If another coil is used to measure the magnetic field acting as a magnetometer , the change in the magnetic field due to the metallic object can be detected. If we as- sume that the soil properties exhibit only random varia- tions around a location-independent mean, and that target echoes are present only in a small amount of data, then we can take the mean of a large number of traces as a mea- sure of the fixed background and subtract it from the raw data.
In cases of doubt, material sample tests in our lab produce sound information.
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