US 12,276,709 B2
Metal detection system using search coil-type sensor
Jae Hun Choi, Seoul (KR); Tae Kyun Kim, Guri-si (KR); and Dong Hyung Kim, Seoul (KR)
Assigned to Jae Hun Choi, Seoul (KR); and Tae Kyun Kim, Guri-si (KR)
Appl. No. 17/915,047
Filed by Jae Hun Choi, Seoul (KR); and Tae Kyun Kim, Guri-si (KR)
PCT Filed Apr. 5, 2021, PCT No. PCT/KR2021/004223
§ 371(c)(1), (2) Date Sep. 27, 2022,
PCT Pub. No. WO2021/210832, PCT Pub. Date Oct. 21, 2021.
Claims priority of application No. 10-2020-0045119 (KR), filed on Apr. 14, 2020.
Prior Publication US 2023/0161066 A1, May 25, 2023
Int. Cl. G01V 3/08 (2006.01); G01R 33/00 (2006.01); G01R 33/02 (2006.01); G01R 33/12 (2006.01); G01V 3/10 (2006.01); G01V 3/38 (2006.01); G01V 11/00 (2006.01)
CPC G01R 33/0005 (2013.01) [G01R 33/0023 (2013.01); G01R 33/0047 (2013.01); G01R 33/0094 (2013.01); G01R 33/02 (2013.01); G01R 33/12 (2013.01); G01V 3/081 (2013.01); G01V 3/10 (2013.01); G01V 3/105 (2013.01); G01V 3/38 (2013.01); G01V 11/00 (2013.01)] 8 Claims
OG exemplary drawing
 
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.