Details of the working principle of large metal detectors

　　First, the principle of security door large metal detector - security gate by the crystal to produce 3.5-4.95M sine oscillation, by the divider divider frequency of 7.8K or so sine wave, by the tripole and coil power amplification after the input door plate (7 zone) large coil electromagnetic wave emission, by the door 1-6 area coil sintoted After receiving, the received signal is compared with the reference signal, after the change, change the output level of the acquisition card, the CPU in 300 milliseconds to scan the 6 location slot card data, determine the location of the metal and output display Metal doors recombine the original, less stable magnetic fields with edges to form a new, more stable magnetic field, which means that metal doors are more stable than other materials This is the advantage of metal doors: gold, improve sensitivity and stability
Second, structure 1, door plate structure: by 1 large coil, 6 small coils, compensation coils and graphite composition
2, chassis structure: by the power board, display panel, motherboard, acquisition card and so on
Third, the needle detector detection workflow CPU detection , a set of infrared blocked , detection of each acquisition card data changes , alarm , detection of another set of infrared , reset re-detection
Four, the use of attention point 1, factory anti-theft: (1) installation is stable, try to recommend its installation away from high-frequency equipment in the area, in order to avoid interference caused by false positives, cross-reporting
(2) rain, sun protection, outdoor installation, equipped with rain canopy and other facilities to increase the service life
(3) Try to keep away from large metal objects when installing
(4) Avoid moving metal objects nearby
2, entertainment (public places): installation is stable, in line with the requirements of the room can be (Stable and sensitivity), adjusting from zui low sensitivity
Fifth, metal detector equipment debugging guidance: from low sensitivity to high sensitivity debugging, that is, the door sensitivity is set low, can not detect objects, no alarm so far, and then a single area in turn to increase the sensitivity, to be able to detect the required items can be
6, common problems and solutions: 1, can detect objects: generally easy to guide magnetic metals, that is, easy to be magnet adsorption objects, such as silicon steel, iron, copper, alloyand and other objects However, such as scattered objects, such as powdered metals, linear metals, etc are not easy to detect Metals can detect a dollar coin as the standard, such as customer materials special, can be asked to samples for testing
2, FAQ: A: installation, clear left and right door panel, left (4P plug), right (3P plug), plugged in firm, can not be back installed B: Check if the strength is always on when you do not alarm, and the infrared count is normal
Metal detector detailed description of specific problems: (1) can not be turned on: (1) the power led light, the inspection box power is plugged in, such as no problem, check whether the insurance tube and part of the power supply line is properly connected (2) The power supply indication is not bright, check whether the inbound navigation is plugged in firmly, the power cord is good (2) infrared does not count: check whether the infrared is plugged in firmly, infrared head is covered (3) Do not alarm: (1) strong and weak always bright, check whether there is interference around, try to convert the crystal to change the frequency (2) Check whether infrared is normal (4) Alarm time is long: check whether the alarm time setting and infrared count is normal (5) String pole: check for interference (6) Liquid crystal gate flow phenomenon: check whether the liquid crystal plate is squeezed, loosen the lcd panel after the screw.