Metal detection system using search coil-type sensor
A metal detecting system using search-coil type sensor includes sensor modules that detect respective objects which move around the corresponding sensor modules, each sensor module having one or more sensors that include respective housings having respective inner spaces, respective cores formed to be inserted into the inner spaces of the housings, and respective coils which are each wound around a portion of an outer circumferential surface of each of the housings, the portion corresponding to a position of each of the cores; imaging units that image the respective objects that move around the corresponding sensor modules and image respective persons possessing the respective objects; impedance matching units that are connected to a plurality of the sensor modules, respectively, and perform impedance matching; and amplifiers that are connected to the impedance matching units, respectively, and amplify a fine current and voltage generated during approach of the objects to the sensor modules.
1. A metal detecting system using a search-coil type sensor, comprising:
at least one sensor module to detect at least one object moving around the at least one sensor module, wherein each of the at least one sensor module comprises at least one sensor;
at least one imaging unit to image the at least one object moving around the at least one sensor module;
at least one impedance matching unit connected to the at least one sensor module and the at least one impedance matching unit to perform impedance matching;
at least one amplifier connected to the at least one impedance matching unit and the at least one amplifier to amplify a fine current and voltage generated during approach of the at least one object to the at least one sensor module;
a first control unit connected to the at least one amplifier, wherein the first control unit is configured to:
store data of respective signal patterns based on magnetic flux densities and speeds of a plurality of objects detected by the at least one sensor module and data of a compound pattern obtained when at least two of the respective signal patterns are superimposed, and
individually identify the plurality of objects by separating the respective signal patterns from each other to generate separated signal patterns of the plurality of objects; and
a second control unit connected to the first control unit and the at least one imaging unit, wherein the second control unit is configured to:
receive the separated signal patterns of the plurality of objects from the first control unit,
collect captured images acquired by the at least one imaging unit,
determine whether a magnetic flux density of each one of the plurality of objects is within a predetermined magnetic flux density range to make a categorization of the each one of the plurality of objects, and
confirm the categorization of the each one of the plurality of objects based on the captured images when the each one of the plurality of objects is exposed, wherein a heat detecting function of the at least one imaging unit is used to confirm the categorization of the each one of the plurality of objects by collecting a thermal image of the each one of the plurality of objects when the each one of the plurality of objects is not exposed.
2. The metal detecting system according to claim 1 , wherein the second control unit generates an alarm signal when determining that the each one of the plurality of objects is a firearm.
3. The metal detecting system according to claim 2 , further comprising an output unit connected to the second control unit to visually output locational changes of the plurality of objects and to output the alarm signal.
4. The metal detecting system according to claim 1 , wherein the at least one sensor comprises a first sensor and a second sensor arranged in parallel with the first sensor, and a core and a coil of the first sensor is formed at a right portion of the first sensor and a core and a coil of the second sensor is formed a left portion of the second sensor.
5. A metal detecting system using a search-coil type sensor, comprising:
at least one sensor module to detect at least one object moving around the at least one sensor module, wherein each of the at least one sensor module comprises a plurality of sensors, and wherein the plurality of sensors are radially arranged so as to have measurable regions of the plurality of sensors to be contiguous to each other;
at least one imaging unit to image the at least one object moving around the at least one sensor module;
at least one impedance matching unit connected to the at least one sensor module and the at least one impedance matching unit to perform impedance matching; and
at least one amplifier connected to the at least one impedance matching unit and the at least one amplifier to amplify a fine current and voltage generated during approach of the at least one object to the at least one sensor module;
a first control unit connected to the at least one amplifier, wherein the first control unit is configured to:
store data of respective signal patterns based on magnetic flux densities and speeds of a plurality of objects and data of a compound pattern obtained when at least two of the respective signal patterns are superimposed, and
individually identify the plurality of objects by separating the respective signal patterns from each other to generate separated signal patterns of the plurality of objects; and
a second control unit connected to the first control unit and the at least one imaging unit, wherein the second control unit is configured to:
receive the separated signal patterns of the plurality of objects from the first control unit,
collect captured images acquired by the at least one imaging unit,
determine whether a magnetic flux density of each one of the plurality of objects is within a predetermined magnetic flux density range to make a categorization of the each one of the plurality of objects, and
confirm the categorization of the each one of the plurality of objects based on the captured images when the each one of the plurality of objects is exposed, wherein a heat detecting function of the at least one imaging unit is used to confirm the categorization of the each one of the plurality of objects by collecting a thermal image of the each one of the plurality of objects when the each one of the plurality of objects is not exposed.
6. The metal detecting system according to claim 5 , wherein the second control unit generates an alarm signal when determining that the each one of the plurality of objects is a firearm.
7. The metal detecting system according to claim 6 , further comprising an output unit connected to the second control unit to visually output locational changes of the plurality of objects and to output the alarm signal.
8. The metal detecting system according to claim 5 , wherein the plurality of sensors is arranged in a three-dimensional radial shape to form measurable regions of the plurality of sensors in spherical shapes.