EP 1080441 A1 20010307 - A METHOD AND A SYSTEM FOR REMOTE DETECTION OF MARKERS
Title (en)
A METHOD AND A SYSTEM FOR REMOTE DETECTION OF MARKERS
Title (de)
EIN VERFAHREN UND SYSTEM ZUR FERNENTSCHLÜSSELUNG VON MARKIERUNGEN
Title (fr)
PROCEDE ET SYSTEME DE DETECTION A DISTANCE DE MARQUEURS
Publication
Application
Priority
- SE 9900786 W 19990511
- SE 9801912 A 19980528
Abstract (en)
[origin: WO9962020A1] A method and a system is provided for remote detection of markers (10), each marker comprising at least two magnetic elements (13) arranged in a predetermined relationship providing an identity of the marker, by either exciting a respective magnetic element (13) to resonate mechanically or by exciting an electrical resonant circuit (14), to which the respective magnetic element (13) is coupled, to oscillate electrically. A resonant frequency (f?res?) of the respective magnetic element or of the electrical resonant circuit depends on an applied magnetic field (H), which is given a varying orientation. A corresponding variation in the resonant frequency (f?res?) is monitored, and an extreme value (f?min local?) of the variation is detected. A momentary orientation ( alpha ?min local?) of the magnetic field is determined in response to the detection of the extreme value, and an orientation of the respective element (13) is determined from this momentary field orientation.
IPC 1-7
G06K 7/08; G08B 13/24; G01B 7/00; G01D 5/12; G01V 3/08; G07C 11/00
IPC 8 full level
G01B 7/00 (2006.01); G01D 5/12 (2006.01); G01V 3/08 (2006.01); G06K 7/08 (2006.01); G06K 19/067 (2006.01); G08B 13/24 (2006.01)
CPC (source: EP)
G01V 3/08 (2013.01); G06K 7/086 (2013.01); G06K 19/0672 (2013.01); G08B 13/2408 (2013.01); G08B 13/246 (2013.01); G08B 13/2485 (2013.01)
Citation (search report)
See references of WO 9962020A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 9962020 A1 19991202; EP 1080441 A1 20010307; JP 2002517004 A 20020611; SE 512488 C2 20000327; SE 9801912 D0 19980528; SE 9801912 L 19991129
DOCDB simple family (application)
SE 9900786 W 19990511; EP 99929978 A 19990511; JP 2000551350 A 19990511; SE 9801912 A 19980528