When a metal object passes through a metal detector , the initial impetus in this subject creates an electromagnetic field of opposite polarity. When the magnetic field of the initial pulse decays and generates a reflected pulse , the magnetic field metal object affect the duration of the reflected pulse towards its increase .
The whole process is similar to an echo if to scream in a room with a small amount of solid surfaces , most likely you will hear only a very short delay , and echo can be no not at all. But if you do the same thing in a room where a lot of hard surfaces , the echo will sound longer. In metal detectors pulse- induction type magnetic field taken onto the object through the frame adds its "echo" to the reflected pulse , slightly increasing its duration.
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Walk-through metal detectors have an ergonomic design so that you can pick up the device to any premises, whether the Bank, airport buildin...
Metal is equipped with pulse circuit that monitors the length of the reflected pulse and compares it with a predetermined expected length . Thus, the circuit may determine that another magnetic field caused the increase in the length of the reflected pulse until its extinction . If the reflected pulse is extinguished after a time interval for a few microseconds longer than normal , it is possible that the reason for this is caught in the metal object .
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Is it possible to pass through the metal detector during pregnancy? At airports, passengers pass through metal detectors that use a low-fre...
Impulse circuit sends weak signals that it monitors the device called " integrator" . Integrator reads the signals from the pulse circuit increases and turns them into direct current . This constant current is applied to the sound scheme that beeps to indicate that the instrument has detected metal object . In the event of such a signal passing through the frame are asked to remove all metal objects and pass through the frame again. If the detector continues to signal detection , an employee uses Inspection Manual metal working on the same principle , to locate the subject .
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Many of the new metal detectors on the market are multi-zone . That is, these devices are equipped with multiple receiving, and transmitting coils located at different heights. Such a device is, in fact , combines several metal detectors.
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Designed to detect weapons and metal objects hidden under human clothing. It can be used to provide routine activities at facilities with c.
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