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EP0338696A2
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Frequency-dividing amorphous wire transponder for use in a presence detection system
Assignee: Security Tag Systems Inc
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Filing: 1989-04-05
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Granted: —
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Expires: 2009-04-05
Abstract
Abstract A transponder (18) for detecting electromagnetic radiation at a first predetermined frequency includes an amorphous, magnetostrictive, ferromagnetic wire (19), which, when excited by electromagnetic radiation at a first predetermined frequency while in the presence of a DC magnetic bias field, transmits electromagnetic radiation at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency. The frequency dividing-wire (19) is produced by flash annealing an amorphous ferromagnetic alloy wire that has been cast by first melting and then quenching the alloy. A useful article (20) containing a transponder (18) including a frequency-dividing wire (19) may be verified as to its authenticity with a presence detection system, in which: electromagnetic radiation (28) at the first predetermined frequency is transmitted into a surveillance zone (30); the frequency-dividing wire (19) detects the transmitted radiation (28) at the first predetermined frequency and responds thereto by transmitting electromagnetic radiation (32) at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency; and a detector (24) detects the transmitted radiation at the second predetermined frequency. The transponder (18) also includes a tube (21), which encloses the wire (19) within the article (20) in such a manner as to enable the wire (19) to mechanically vibrate when excited by an electromagnetic field at the characteristic first predetermined frequency of the wire.
Inventors
- 👤 Subrata Dey
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:38
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2408; G01; G01S; G01S13/00; G01S13/74; G01S13/75; G01S13/751; G01S13/753; G08B13/2428; G08B13/2437; G08B13/244; G08B13/2442
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
85 words
A transponder (18) for detecting electromagnetic radiation at a first predetermined frequency and responding to said detection by transmitting electromagnetic radiation at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency, comprising an amorphous, magnetostrictive, ferromagnetic wire (19), which, when excited by an electromagnetic field of a first predetermined frequency while in the presence of a DC magnetic bias field, transmits electromagnetic radiation at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency.
Claim 2
Dependent Claim
85 words
A transponder (18) for detecting electromagnetic radiation at a first predetermined frequency and responding to said detection by transmitting electromagnetic radiation at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency, comprising an amorphous, magnetostrictive, ferromagnetic wire (19), which, when excited by an electromagnetic field of a first predetermined frequency while in the presence of a DC magnetic bias field, transmits electromagnetic radiation at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency.
Claim 3
Dependent Claim
37 words
A transponder according to Claim 1, further comprising means (21) for enclosing the wire (19) in an article (20) in such a manner as to enable the wire to mechanically vibrate when excited by said electromagnetic field.
Claim 4
Dependent Claim
19 words
A transponder according to Claim 1, wherein the wire (19) is an alloy consisting of Iron, Boron and Silicon.
Claim 5
Dependent Claim
20 words
A transponder according to Claim 1, wherein the wire (19) is an alloy consisting of Iron, Boron, Silicon and Carbon.
Claim 6
Dependent Claim
100 words
A presence detection system, comprising means (22) for transmitting an electromagnetic radiation signal (28) first predetermined frequency into a surveillance zone (30); a transponder (18) for attachment to or enclosure in an article (20) to be detected within the surveillance zone (30), including an amorphous ferromagnetic wire (19) for detecting electromagnetic radiation (28) at the first predetermined frequency and responding to said detection by transmitting electromagnetic radiation (32) at a lesser second predetermined frequency that is a frequency-divided quotient of the first frequency; and means (24) for detecting electromagnetic radiation (32) at the second frequency within the surveillance zone (30).
Claim 7
Dependent Claim
100 words
A presence detection system, comprising means (22) for transmitting an electromagnetic radiation signal (28) first predetermined frequency into a surveillance zone (30); a transponder (18) for attachment to or enclosure in an article (20) to be detected within the surveillance zone (30), including an amorphous ferromagnetic wire (19) for detecting electromagnetic radiation (28) at the first predetermined frequency and responding to said detection by transmitting electromagnetic radiation (32) at a lesser second predetermined frequency that is a frequency-divided quotient of the first frequency; and means (24) for detecting electromagnetic radiation (32) at the second frequency within the surveillance zone (30).
Claim 8
Dependent Claim
35 words
A system according to Claim 5, further comprising means (26) for providing a DC magnetic bias field within the surveillance zone (30) to subject the wire to said bias field when within said surveillance zone.
Claim 9
Dependent Claim
91 words
A useful article (20) that can be verified as to its authenticity by reason of exhibiting a predetermined frequency-dividing characteristic when excited by a first predetermined frequency, comprising a useful article, (20), and a transponder (18) including an amorphous, magnetostrictive, ferromagnetic wire (19) contained by the article (20), which wire, when excited by electromagnetic radiation (28) of a first predetermined frequency while in the presence of a DC magnetic bias field, transmits electromagnetic radiation (32) at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency.
Claim 10
Dependent Claim
91 words
A useful article (20) that can be verified as to its authenticity by reason of exhibiting a predetermined frequency-dividing characteristic when excited by a first predetermined frequency, comprising a useful article, (20), and a transponder (18) including an amorphous, magnetostrictive, ferromagnetic wire (19) contained by the article (20), which wire, when excited by electromagnetic radiation (28) of a first predetermined frequency while in the presence of a DC magnetic bias field, transmits electromagnetic radiation (32) at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency.
Claim 11
Independent Claim
117 words
A system for verifying the authenticity of a useful article that exhibits a predetermined frequency-dividing characteristic when excited by a first predetermined frequency, comprising an useful article (20) containing a transponder (18) including an amorphous, magnetostrictive, ferromagnetic wire (19), which, when excited by electromagnetic radiation (28) of a first predetermined frequency while in the presence of a DC magnetic bias field, transmits electromagnetic radiation (32) at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency; means (22) for transmitting an electromagnetic radiation signal (28) of a first predetermined frequency into a surveillance zone (30); and means (24) for detecting electromagnetic radiation (32) at the second frequency within the surveillance zone (30).
Claim 12
Independent Claim
117 words
A system for verifying the authenticity of a useful article that exhibits a predetermined frequency-dividing characteristic when excited by a first predetermined frequency, comprising an useful article (20) containing a transponder (18) including an amorphous, magnetostrictive, ferromagnetic wire (19), which, when excited by electromagnetic radiation (28) of a first predetermined frequency while in the presence of a DC magnetic bias field, transmits electromagnetic radiation (32) at a lesser second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency; means (22) for transmitting an electromagnetic radiation signal (28) of a first predetermined frequency into a surveillance zone (30); and means (24) for detecting electromagnetic radiation (32) at the second frequency within the surveillance zone (30).
Claim 13
Independent Claim
46 words
A method of treating amorphous ferromagnetic alloy wire to provide the wire with a frequency-dividing characteristic, comprising the steps of (a) selecting an amorphous, ferromagnetic alloy wire that has been cast by first melting and then quenching the alloy; and (b) flash annealing the selected wire.
Claim 14
Independent Claim
46 words
A method of treating amorphous ferromagnetic alloy wire to provide the wire with a frequency-dividing characteristic, comprising the steps of (a) selecting an amorphous, ferromagnetic alloy wire that has been cast by first melting and then quenching the alloy; and (b) flash annealing the selected wire.
Claim 15
Independent Claim
39 words
A method of manufacturing an amorphous, ferromagnetic alloy wire having a frequency-dividing characteristic, comprising the steps of (a) providing an amorphous ferromagnetic alloy wire by first melting and then quenching the alloy; and (b) flash annealing the provided wire.
Claim 16
Independent Claim
39 words
A method of manufacturing an amorphous, ferromagnetic alloy wire having a frequency-dividing characteristic, comprising the steps of (a) providing an amorphous ferromagnetic alloy wire by first melting and then quenching the alloy; and (b) flash annealing the provided wire.
References Cited (Backward Citations)
No citation records indexed.
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