WO2025029073A1 - Security paper detection device capable of avoiding ambient environmental noise - Google Patents
Security paper detection device capable of avoiding ambient environmental noise Download PDFInfo
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- WO2025029073A1 WO2025029073A1 PCT/KR2024/011348 KR2024011348W WO2025029073A1 WO 2025029073 A1 WO2025029073 A1 WO 2025029073A1 KR 2024011348 W KR2024011348 W KR 2024011348W WO 2025029073 A1 WO2025029073 A1 WO 2025029073A1
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- magnetic field
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
- 230000007613 environmental effect Effects 0.000 title description 4
- 238000012545 processing Methods 0.000 claims abstract description 37
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000005300 metallic glass Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000005330 Barkhausen effect Effects 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
Definitions
- the present invention relates to an electromagnetic (EM) type security paper detection gate and a handy security detector for preventing leakage of security paper, and more specifically, to a security paper detection device for detecting amorphous microwires contained in security paper.
- EM electromagnetic
- the 'security paper detection device' in the present invention includes a security paper detection gate that detects whether a person is carrying a security paper and sounds an alarm when passing through the gate while carrying the security paper, and a handy security paper detector that allows a security guard to search in more detail whether an entrant is carrying a security paper.
- EM Electro-magnetic
- U.S. Patent No. 5,414,410 discloses a technique for a transmitter for generating two alternating magnetic fields through a single transmitting coil supplied with a transmitting signal current, and a receiver for detecting harmonics and intermodulation signals of the alternating magnetic fields through a receiving coil for generating a receiving signal current.
- U.S. Patent No. 5,894,270 relates to an electronic security element monitoring device within an interrogation area, comprising a transmitter that emits at least one periodic magnetic field signal into a detection area, the signal causing the security element to generate a specific signal, a receiving device that receives the specific signal, and a technique for evaluating the signal received from the receiving device and generating an alarm when the presence of the security element is established.
- U.S. Patent No. 5,969,611 relates to a device for monitoring electronic security elements within an investigation area, wherein a transmitter emits a transmission signal to a detection area, and the transmission signal causes a security element to generate a characteristic signal, and a receiver receives the characteristic signal generated from the security element by the transmission signal, evaluates the characteristic signal, and generates an alarm if the presence of the security element is confirmed, and discloses a technology for removing a spike signal when the received signal includes a spike signal during the evaluation.
- Patent Document 0001 US Patent No. 5414410
- Patent Document 0002 US Patent No. 5894270
- Patent Document 0003 US Patent No. 5,969,611
- the present invention aims to provide a security paper detection device that solves the problems of the prior art, and more specifically, to avoid power noise generated around a detection gate that overlaps with the detection frequency coming into a receiver (RX antenna) and noise generated from other peripheral electronic equipment, thereby reducing the possibility of detection errors that may be caused by such peripheral noise.
- a security paper detection device includes: a magnetic field frequency variable means; a TX antenna connected to the magnetic field frequency variable means; an RX antenna positioned corresponding to the TX antenna; an amplifier connected to the RX antenna; and a signal processing means connected to the amplifier; wherein the signal processing means provides a feedback signal to the magnetic field frequency variable means and changes a multiplication (detection) frequency, and the magnetic field frequency variable means changes a magnetic field frequency according to the provided feedback signal.
- the multiplication (detection) frequency distribution is adjusted to be separated from the surrounding environmental noise, thereby minimizing the influence of power noise or noise from surrounding electronic devices, thereby minimizing detection errors of the security paper detection device.
- Figure 1 is a diagram showing the process by which Barkhausen noise occurs.
- FIG. 2 is a drawing showing a basic concept of a security paper detection device according to an embodiment of the present invention.
- Figure 3 is a drawing showing the result of avoiding ambient noise according to an embodiment of the present invention.
- FIG. 4 is a block diagram of a security paper detection device according to one embodiment of the present invention.
- FIG. 5 is a detailed block diagram of a security paper detection device according to one embodiment of the present invention.
- a security paper detection device comprises: a magnetic field frequency variable means; a TX antenna connected to the magnetic field frequency variable means; an RX antenna positioned to correspond to the TX antenna; an amplifier connected to the RX antenna; and a signal processing means connected to the amplifier; wherein the signal processing means provides a feedback signal to the magnetic field frequency variable means and changes a multiplication (detection) frequency, and the magnetic field frequency variable means changes a magnetic field frequency according to the provided feedback signal.
- the magnetic field frequency variable means includes a signal generator and a power amplifier connected to the signal generator.
- the signal processing means includes a filter connected to the amplifier, an AD converter connected to the filter, and a digital signal processing means (DSP: Digital Signal Processing) connected to the AD converter and providing a feedback signal to the magnetic field frequency variable means and changing a multiplication (detection) frequency.
- DSP Digital Signal Processing
- the security paper detection device further includes an alarm means connected to the signal processing means.
- Fig. 1 is a diagram showing the process of generating Barkhausen noise, which is the core of the basic principle of a security paper detection device.
- an AC sinusoidal current such as B of Fig. 1 is passed through the TX antenna of Fig. 2 to form an AC magnetic field around the TX antenna and the RX antenna, and a security paper containing an amorphous metal passes through the formed AC magnetic field
- a B-H curve for the amorphous metal such as A of Fig. 1 is formed.
- noise such as C of Fig. 1 is generated, which is called Barkhausen noise.
- Barkhausen noise has a frequency spectrum with unique characteristics in the frequency domain. When the frequency spectrum with such unique characteristics is analyzed and is the same as the spectrum of the amorphous metal, it is determined to be security paper and an alarm is sounded.
- the frequency spectrum of Barkhausen noise is expressed as a multiple of the magnetic field formation frequency.
- the presence of security paper i.e., the presence of amorphous metal
- the multiple frequencies f1, f2, f3...) excluding the magnetic field formation frequency (f0).
- f1 the frequency spectrum of Barkhausen noise
- Fig. 3 (a) if noise from the external environment occurs close to f2, which is one of the multiple frequencies, it causes an error in the analysis of the multiple frequencies, resulting in an error in determining the presence of amorphous metal.
- FIGS. 4 and 5 are block diagrams and detailed configuration diagrams of a security paper detection device according to one embodiment of the present invention for resolving errors in the above-described multiplication frequency analysis.
- a security paper detection device (100) includes a magnetic field frequency variable means (110), a TX antenna (120) connected to the magnetic field frequency variable means (110), an RX antenna (130) positioned corresponding to the TX antenna (120), an amplifier (140) connected to the RX antenna (130), and a signal processing means (150) connected to the amplifier (140).
- the magnetic field frequency varying means (110) includes a signal generator (111) that generates a magnetic field frequency and a power amplifier (112) connected to the signal generator (111), and the signal generator (111) of the magnetic field frequency varying means (110) changes and outputs the magnetic field frequency according to a feedback signal provided from a digital signal processing means (153) of the signal processing means (150).
- the signal processing means (150) includes a filter (151) connected to the amplifier (140), an AD converter (152) connected to the filter (151), and a digital signal processing means (153) connected to the AD converter (152) and providing a feedback signal to the signal generator (111) of the magnetic field frequency variable means (110) and changing the multiplication (detection) frequency.
- the digital signal processing means (153: DSP) is generally composed of a digital signal processor and a control unit that receives a processed signal and performs subsequent processing.
- the security paper detection device (100) further includes an alarm means (160) connected to a signal processing means (150), and when the signal processing means (150) detects security paper, it controls the alarm means (160) so that the alarm means (160) can give an alarm through light or a warning sound via an LED.
- the signal generator (111) of the magnetic field frequency variable means (110) in a state where there is no metal object including security paper around the TX antenna (120) and the RX antenna (130), the signal generator (111) of the magnetic field frequency variable means (110) generates a signal of a preset magnetic field formation frequency (f0), amplifies this signal through a power amplifier (112), and inputs it to the TX antenna (120), so that an alternating magnetic field is formed around the TX antenna (120) and the RX antenna (130), and the signal processing means (150) passes only a certain band of the signal input from the RX antenna (130) through the amplifier (140) through a filter (151), and then changes this into a digital signal through an AD converter (152), and then analyzes this in the digital signal processing means (153).
- the digital signal processing means (153) determines that the frequency of external noise caused by the surrounding environment overlaps with the multiplication (detection) frequency range, and to resolve this, the digital signal processing means (153) provides a feedback signal to the signal generator (111) of the magnetic field frequency variable means (110) based on the analysis result.
- the magnetic field formation frequency (f0) is changed to f0+a according to the feedback signal provided from the digital signal processing means (153) and inputted to the TX antenna (120), thereby forming a new alternating magnetic field around the TX antenna (120) and the RX antenna (130).
- the digital signal processing means (153) of the signal processing means (150) changes the multiplication frequency to f1+2a, f2+3a, f3+4a, etc., and then analyzes the new signal inputted from the RX antenna (130) through the amplifier (140) again to determine whether the frequency of the external noise overlaps with the changed multiplication (detection) frequency range, and if the frequency of the signal inputted through the amplifier (140) overlaps again with the multiplication (detection) frequency range, the above process is continuously repeated so that the frequency of the external noise and the multiplication (detection) frequency do not overlap.
- the signal processing means (150) when the frequency f0 of forming an AC magnetic field is changed by a by a feedback signal provided from the signal processing means (150) in the magnetic field frequency variable means (110), the signal processing means (150) must also change the multiplication (detection) frequency range from f1 to f1+2a, from f2 to f2+3a, and from f3 to f3+4a.
- the signal processing means (150) provides a feedback signal to the magnetic field frequency variable means (110) and also changes the multiplication (detection) frequency.
- the signal processing means (150) changes the multiplication (detection) frequency distribution, thereby adjusting the multiplication (detection) frequency distribution to be separated from the surrounding environmental noise, so that the security paper can be detected without being affected by the surrounding environmental noise when detecting the security paper. Therefore, since the multiplication (detection) frequency analysis is facilitated by the security paper detection device (100) according to one embodiment of the present invention, security paper detection errors can be reduced.
- a security paper detection device can be provided that can reduce the possibility of detection errors that may occur due to the above-mentioned surrounding noise by avoiding power noise and noise generated from other surrounding electronic equipment.
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Abstract
Description
본 발명은 보안용지의 유출을 방지하기 위한 전자기(EM: Electromagnetic) 방식의 보안용지 감지 게이트 및 핸디형 보안 감지기에 관한 것으로, 보다 구체적으로는 보안용지에 들어가는 비결정질 마이크로와이어(Micro-wire)를 감지하기 위한 보안용지 감지장치에 관한 것이다.The present invention relates to an electromagnetic (EM) type security paper detection gate and a handy security detector for preventing leakage of security paper, and more specifically, to a security paper detection device for detecting amorphous microwires contained in security paper.
본 발명에서 이를 보안용지 감지장치라 통칭하며, 본 발명에서 '보안용지 감지장치'란 사람이 보안용지를 소지한 상태에서 게이트를 통과할 때 보안용지의 소지 유무를 감지하여 알람을 울리는 보안용지 감지 게이트와 보안요원이 출입자의 보안용지의 소지 여부를 좀 더 상세히 검색할 수 있는 핸디형 보안용지 감지기를 포함한다.In the present invention, this is collectively referred to as a security paper detection device, and the 'security paper detection device' in the present invention includes a security paper detection gate that detects whether a person is carrying a security paper and sounds an alarm when passing through the gate while carrying the security paper, and a handy security paper detector that allows a security guard to search in more detail whether an entrant is carrying a security paper.
보안을 필요로 하는 주요 정보가 인쇄된 종이문서(출력물)의 외부 유출을 방지하는 물리 보안 솔루션에 대한 기술로서, 특수합금 물질이 내장되어 있는 보안용지를 사용하여 출력된 보안용지의 불법 유출 시도 시 이를 감지하여 경보를 발생시키는 출력물 유출 방지 솔루션으로, 일반적으로 적용중인 기술인 EM(Electro-magnetic) 기술을 이용하고 있기 때문에, 주변 환경에서 발생하는 전자기적인 노이즈(Noise), 휴대용 제품의 기술이 고도화 함에 따라 사용되는 다양한 합금소재 등에 의해 감지 방해 또는 감지 오류가 발생하는 등의 보안 취약점을 가지고 있다. This is a technology for a physical security solution that prevents external leakage of printed paper documents (printouts) containing key information requiring security. It is a printout leakage prevention solution that detects and generates an alarm when an illegal leakage attempt is made on printed security paper using security paper with a special alloy material embedded. Since it utilizes EM (Electro-magnetic) technology, which is a technology that is generally applied, it has security vulnerabilities such as detection interference or detection errors caused by electromagnetic noise generated in the surrounding environment and various alloy materials used as the technology of portable products becomes more advanced.
종래 기술로 미국특허 제5414410호에는 송신 신호전류가 공급되는 단일 송신 코일을 통해 2개의 교류 자기장을 생성하기 위한 송신기와 수신 신호전류를 생성하는 수신 코일을 통하여 교류 자기장의 고조파 및 상호 변조신호를 감지하는 수신기에 대한 기술을 개시하고 있다.In the prior art, U.S. Patent No. 5,414,410 discloses a technique for a transmitter for generating two alternating magnetic fields through a single transmitting coil supplied with a transmitting signal current, and a receiver for detecting harmonics and intermodulation signals of the alternating magnetic fields through a receiving coil for generating a receiving signal current.
또한, 미국특허 제5894270호에는 심문 구역 내 전자 보안소자 감시 장치에 관한 것으로, 보안 요소가 특정 신호를 발생하게 하는, 적어도 하나의 주기적 자기장 신호를 감지구역으로 방출하는 송신장치를 포함하고, 특정 신호를 수신하는 수신 디바이스 및 수신 디바이스로부터 수신된 신호를 평가하고 보안 요소의 존재가 확립될 때 경보를 생성하는 기술을 개시하고 있다.Also, U.S. Patent No. 5,894,270 relates to an electronic security element monitoring device within an interrogation area, comprising a transmitter that emits at least one periodic magnetic field signal into a detection area, the signal causing the security element to generate a specific signal, a receiving device that receives the specific signal, and a technique for evaluating the signal received from the receiving device and generating an alarm when the presence of the security element is established.
또한, 미국특허 제5969611호에는 조사 구역 내 전자 보안소자 감시 장치에 관한 것으로, 송신장치는 송신 신호를 감지구역으로 방출하고 이 송신 신호는 보안 요소가 특성 신호를 발생시키도록 하고, 수신 장치는 송신 신호에 의해 보안 요소에서 발생된 특성 신호를 수신하고 그 특성 신호를 평가하고 보안 요소의 존재가 확인되면 경보를 발생시키는데 평가 시 수신된 신호에 스파이크성 신호가 포함되어 있을 때 그 스파이크성 신호를 제거하는 기술을 개시하고 있다.In addition, U.S. Patent No. 5,969,611 relates to a device for monitoring electronic security elements within an investigation area, wherein a transmitter emits a transmission signal to a detection area, and the transmission signal causes a security element to generate a characteristic signal, and a receiver receives the characteristic signal generated from the security element by the transmission signal, evaluates the characteristic signal, and generates an alarm if the presence of the security element is confirmed, and discloses a technology for removing a spike signal when the received signal includes a spike signal during the evaluation.
그러나 상기 종래 기술들에서는 감지하고자 하는 주파수와 외부에서 발생되는 노이즈의 주파수가 겹치는 경우에 감지하고자 하는 신호와 노이즈가 분리되지 않아 감지 오류가 발생할 가능성이 높다.However, in the above conventional technologies, if the frequency to be detected overlaps with the frequency of noise generated externally, there is a high possibility that a detection error will occur because the signal to be detected and the noise are not separated.
선행기술문헌Prior art literature
(특허문헌 0001) 미국특허 제5414410호(Patent Document 0001) US Patent No. 5414410
(특허문헌 0002) 미국특허 제5894270호(Patent Document 0002) US Patent No. 5894270
(특허문헌 0003) 미국특허 제5969611호(Patent Document 0003) US Patent No. 5,969,611
본 발명은 종래 기술이 갖는 문제점을 해결한 보안용지 감지장치를 제공하는 것을 목적으로 하며, 더욱 구체적으로는 수신기(RX 안테나)로 들어오는 감지주파수와 겹치는 감지 게이트 주변에서 발생하는 전원 노이즈, 기타 주변 전자장비에서 발생하는 노이즈를 회피함으로써, 상기와 같은 주변 노이즈에 의해 발생할 수 있는 감지 오류의 가능성을 줄이고자 한다. The present invention aims to provide a security paper detection device that solves the problems of the prior art, and more specifically, to avoid power noise generated around a detection gate that overlaps with the detection frequency coming into a receiver (RX antenna) and noise generated from other peripheral electronic equipment, thereby reducing the possibility of detection errors that may be caused by such peripheral noise.
본 발명의 일 실시예에 따르면 보안용지 감지장치는 자기장 주파수 가변수단과; 상기 자기장 주파수 가변수단과 연결되는 TX 안테나와; 상기 TX 안테나와 대응되게 위치하는 RX 안테나와; 상기 RX 안테나에 연결되는 증폭기와; 상기 증폭기와 연결되는 신호처리수단;을 포함하고, 상기 신호처리수단은 상기 자기장 주파수 가변수단으로 피드백 신호를 제공하고, 체배(감지) 주파수를 변경하며, 상기 자기장 주파수 가변수단은 상기 제공된 피드백 신호에 따라 자기장 주파수를 변경한다.According to one embodiment of the present invention, a security paper detection device includes: a magnetic field frequency variable means; a TX antenna connected to the magnetic field frequency variable means; an RX antenna positioned corresponding to the TX antenna; an amplifier connected to the RX antenna; and a signal processing means connected to the amplifier; wherein the signal processing means provides a feedback signal to the magnetic field frequency variable means and changes a multiplication (detection) frequency, and the magnetic field frequency variable means changes a magnetic field frequency according to the provided feedback signal.
본 발명의 실시예에 따르면, 체배(감지) 주파수 분포가 주변 환경 노이즈와 이격 되도록 조정되어, 전원 노이즈나 주변 전자장치의 노이즈 영향을 최소화함으로써 보안용지 감지장치의 감지 오류를 최소화할 수 있다.According to an embodiment of the present invention, the multiplication (detection) frequency distribution is adjusted to be separated from the surrounding environmental noise, thereby minimizing the influence of power noise or noise from surrounding electronic devices, thereby minimizing detection errors of the security paper detection device.
도 1은 바크하우젠 노이즈가 발생하는 과정을 보여주기 위한 도면이다. Figure 1 is a diagram showing the process by which Barkhausen noise occurs.
도 2는 본 발명의 실시예에 따른 보안 용지 감지장치의 기본 개념도를 보여 주기 위한 도면이다.FIG. 2 is a drawing showing a basic concept of a security paper detection device according to an embodiment of the present invention.
도 3은 본 발명의 실시예에 따른 주변 노이즈를 회피한 결과를 보여 주기 위한 도면이다. Figure 3 is a drawing showing the result of avoiding ambient noise according to an embodiment of the present invention.
도 4는 본 발명의 일 실시예에 따른 보안용지 감지장치의 블럭도이다.FIG. 4 is a block diagram of a security paper detection device according to one embodiment of the present invention.
도 5는 본 발명의 일 실시예에 따른 보안용지 감지장치의 세부 블록도이다.FIG. 5 is a detailed block diagram of a security paper detection device according to one embodiment of the present invention.
본 발명의 일 실시예에 따른 보안용지 감지장치는 자기장 주파수 가변수단과; 상기 자기장 주파수 가변수단과 연결되는 TX 안테나와; 상기 TX 안테나와 대응되게 위치하는 RX 안테나와; 상기 RX 안테나에 연결되는 증폭기와; 상기 증폭기와 연결되는 신호처리수단;을 포함하고, 상기 신호처리수단은 상기 자기장 주파수 가변수단으로 피드백 신호를 제공하고, 체배(감지) 주파수를 변경하며, 상기 자기장 주파수 가변수단은 상기 제공된 피드백 신호에 따라 자기장 주파수를 변경하는 것을 특징으로 한다.According to one embodiment of the present invention, a security paper detection device comprises: a magnetic field frequency variable means; a TX antenna connected to the magnetic field frequency variable means; an RX antenna positioned to correspond to the TX antenna; an amplifier connected to the RX antenna; and a signal processing means connected to the amplifier; wherein the signal processing means provides a feedback signal to the magnetic field frequency variable means and changes a multiplication (detection) frequency, and the magnetic field frequency variable means changes a magnetic field frequency according to the provided feedback signal.
또한, 상기 자기장 주파수 가변수단은 신호 생성기(Signal Generator)와, 상기 신호 생성기에 연결되는 전력 증폭기(Power Amp)를 포함한다.Additionally, the magnetic field frequency variable means includes a signal generator and a power amplifier connected to the signal generator.
또한, 상기 신호처리수단은 상기 증폭기와 연결되는 필터와, 상기 필터와 연결되는 AD 컨버터와, 상기 AD 컨버터와 연결되고 상기 자기장 주파수 가변수단에 피드백 신호를 제공하고, 체배(감지) 주파수를 변경하는 디지털 신호처리수단(DSP: Digital Signal Processing)을 포함한다.In addition, the signal processing means includes a filter connected to the amplifier, an AD converter connected to the filter, and a digital signal processing means (DSP: Digital Signal Processing) connected to the AD converter and providing a feedback signal to the magnetic field frequency variable means and changing a multiplication (detection) frequency.
또한, 상기 보안 용지 감지 장치는 상기 신호처리수단에 연결되는 알람수단을 더 포함한다.In addition, the security paper detection device further includes an alarm means connected to the signal processing means.
이하에서 첨부한 도면에 기초하여 본 발명에 따른 보안용지 감지장치를 설명한다. 아래의 설명은 본 발명의 바람직한 일 실시예를 설명하는 것이다.Hereinafter, a security paper detection device according to the present invention will be described based on the attached drawings. The following description describes a preferred embodiment of the present invention.
도 1은 보안용지 감지장치의 기본 원리의 핵심인 바크하우젠 노이즈의 발생 과정을 나타내는 도면으로 도 2의 TX 안테나에 도 1의 B와 같은 교류 정현파 전류를 흘려 TX 안테나와 RX 안테나 주변에 교류 자기장을 형성하면 형성된 교류 자기장 내에 비결정질 금속이 포함된 보안용지가 통과될 때 도 1의 A와 같은, 비결정질 금속에 대한 B-H 곡선이 형성된다. 이때 교류 자기장에 의해 비결정질 금속 내의 자구배열(磁區配列)이 교류 자기장을 따라 변화하면서 도 1의 C와 같은 노이즈가 발생하는데 이를 바크하우젠 노이즈라고 한다. 그러한 바크하우젠 노이즈는 주파수 영역에서 고유한 특성의 주파수 스펙트럼을 가지는데 그러한 고유한 특성의 주파수 스펙트럼을 분석하여 비정질 금속의 스펙트럼과 같으면 보안용지라고 판단하여 경보를 울리게 된다.Fig. 1 is a diagram showing the process of generating Barkhausen noise, which is the core of the basic principle of a security paper detection device. When an AC sinusoidal current such as B of Fig. 1 is passed through the TX antenna of Fig. 2 to form an AC magnetic field around the TX antenna and the RX antenna, and a security paper containing an amorphous metal passes through the formed AC magnetic field, a B-H curve for the amorphous metal such as A of Fig. 1 is formed. At this time, when the magnetic domain arrangement in the amorphous metal changes along the AC magnetic field due to the AC magnetic field, noise such as C of Fig. 1 is generated, which is called Barkhausen noise. Such Barkhausen noise has a frequency spectrum with unique characteristics in the frequency domain. When the frequency spectrum with such unique characteristics is analyzed and is the same as the spectrum of the amorphous metal, it is determined to be security paper and an alarm is sounded.
그런데 도 3의 주파수 스펙트럼과 같이 바크하우젠 노이즈의 주파수 스펙트럼은 자기장 형성 주파수의 체배로 나타나는데 이때 자기장 형성 주파수(f0)를 제외한 체배 주파수(f1, f2, f3...)의 스펙트럼 분석을 통하여 보안용지 여부, 즉 비결정질 금속의 존재 여부를 판단한다. 그런데 도 3의 (가)와 같이 외부 환경의 노이즈가 체배 주파수 중의 하나인 f2에 근접하여 발생할 경우 체배 주파수의 분석에 오류를 일으켜 비결정질 금속의 여부 판단의 오류를 발생시킨다.However, as shown in the frequency spectrum of Fig. 3, the frequency spectrum of Barkhausen noise is expressed as a multiple of the magnetic field formation frequency. At this time, the presence of security paper, i.e., the presence of amorphous metal, is determined through spectrum analysis of the multiple frequencies (f1, f2, f3...) excluding the magnetic field formation frequency (f0). However, as shown in Fig. 3 (a), if noise from the external environment occurs close to f2, which is one of the multiple frequencies, it causes an error in the analysis of the multiple frequencies, resulting in an error in determining the presence of amorphous metal.
도 4 및 도 5는 위와 같은 체배 주파수 분석에 오류를 일으키는 것을 해결하기 위한 본 발명의 일 실시예에 따른 보안용지 감지 장치의 블록도 및 그 세부 구성에 따른 블럭도이다.FIGS. 4 and 5 are block diagrams and detailed configuration diagrams of a security paper detection device according to one embodiment of the present invention for resolving errors in the above-described multiplication frequency analysis.
도 4 및 도 5를 참조하면, 본 발명의 일 실시예에 따른 보안용지 감지장치(100)는 자기장 주파수 가변수단(110)과, 자기장 주파수 가변수단(110)과 연결되는 TX 안테나(120)와, TX 안테나(120)와 대응되게 위치하는 RX 안테나(130)와, RX 안테나(130)에 연결되는 증폭기(140)와, 증폭기(140)와 연결되는 신호처리수단(150)을 포함한다. Referring to FIGS. 4 and 5, a security paper detection device (100) according to one embodiment of the present invention includes a magnetic field frequency variable means (110), a TX antenna (120) connected to the magnetic field frequency variable means (110), an RX antenna (130) positioned corresponding to the TX antenna (120), an amplifier (140) connected to the RX antenna (130), and a signal processing means (150) connected to the amplifier (140).
여기서, 자기장 주파수 가변수단(110)은 자기장 주파수를 생성하는 신호 생성기(111)와, 신호 생성기(111)에 연결되는 전력 증폭기(112)를 포함하고, 자기장 주파수 가변수단(110)의 신호 생성기(111)는 신호처리수단(150)의 디지털 신호처리수단(153)으로부터 제공된 피드백 신호에 따라 자기장 주파수를 변경하여 출력한다.Here, the magnetic field frequency varying means (110) includes a signal generator (111) that generates a magnetic field frequency and a power amplifier (112) connected to the signal generator (111), and the signal generator (111) of the magnetic field frequency varying means (110) changes and outputs the magnetic field frequency according to a feedback signal provided from a digital signal processing means (153) of the signal processing means (150).
그리고, 신호처리수단(150)은 증폭기(140)와 연결되는 필터(151)와, 필터(151)와 연결되는 AD 컨버터(152)와, AD 컨버터(152)와 연결되고 자기장 주파수 가변수단(110)의 신호 생성기(111)로 피드백 신호를 제공하며, 체배(감지) 주파수를 변경하는 디지털 신호처리수단(153)을 포함한다. 한편, 디지털 신호처리수단(153: DSP)은 일반적으로 디지털 신호처리기와 처리된 신호를 받아 후속 처리를 하는 제어부로 구성된다.And, the signal processing means (150) includes a filter (151) connected to the amplifier (140), an AD converter (152) connected to the filter (151), and a digital signal processing means (153) connected to the AD converter (152) and providing a feedback signal to the signal generator (111) of the magnetic field frequency variable means (110) and changing the multiplication (detection) frequency. Meanwhile, the digital signal processing means (153: DSP) is generally composed of a digital signal processor and a control unit that receives a processed signal and performs subsequent processing.
또한, 보안용지 감지장치(100)에는 신호처리수단(150)에 연결되는 알람수단(160)을 더 포함하고, 신호처리수단(150)은 보안 용지를 감지하는 경우 알람수단(160)을 제어하여, 알람수단(160)에서 LED를 통한 빛이나 경고음을 통해 경보를 알려줄 수 있다.In addition, the security paper detection device (100) further includes an alarm means (160) connected to a signal processing means (150), and when the signal processing means (150) detects security paper, it controls the alarm means (160) so that the alarm means (160) can give an alarm through light or a warning sound via an LED.
위와 같은 구성에 따른 동작을 살펴보면, TX 안테나(120)와 RX 안테나(130) 주변에 보안용지를 비롯한 금속물체가 없는 상태에서 자기장 주파수 가변수단(110)의 신호 생성기(111)는 기 설정된 자기장 형성 주파수(f0) 신호를 생성하고, 이 신호를 전력 증폭기(112)를 통해 증폭한 후 TX 안테나(120)로 입력시켜, TX 안테나(120)와 RX 안테나(130) 주변에 교류 자기장이 형성되도록 하며, 신호처리수단(150)은 RX 안테나(130)로부터 증폭기(140)를 통해 입력되는 신호를 필터(151)로 일정 대역만 통과시킨 후 이를 AD 컨버터(152)를 통해 디지털 신호로 변경한 후 디지털 신호처리수단(153)에서 이를 분석한다. 만약 증폭기(140)를 통해 입력되는 신호의 주파수가 체배(감지) 주파수영역과 겹칠 경우, 디지털 신호처리수단(153)은 주변 환경에 의한 외부 노이즈의 주파수가 체배(감지) 주파수영역과 겹치는 것으로 판단하고, 이를 해결하기 위하여 디지털 신호처리수단(153)에서는 분석한 결과를 바탕으로 자기장 주파수 가변수단(110)의 신호 생성기(111)로 피드백 신호를 제공한다. Looking at the operation according to the above configuration, in a state where there is no metal object including security paper around the TX antenna (120) and the RX antenna (130), the signal generator (111) of the magnetic field frequency variable means (110) generates a signal of a preset magnetic field formation frequency (f0), amplifies this signal through a power amplifier (112), and inputs it to the TX antenna (120), so that an alternating magnetic field is formed around the TX antenna (120) and the RX antenna (130), and the signal processing means (150) passes only a certain band of the signal input from the RX antenna (130) through the amplifier (140) through a filter (151), and then changes this into a digital signal through an AD converter (152), and then analyzes this in the digital signal processing means (153). If the frequency of the signal input through the amplifier (140) overlaps with the multiplication (detection) frequency range, the digital signal processing means (153) determines that the frequency of external noise caused by the surrounding environment overlaps with the multiplication (detection) frequency range, and to resolve this, the digital signal processing means (153) provides a feedback signal to the signal generator (111) of the magnetic field frequency variable means (110) based on the analysis result.
자기장 주파수 가변수단(110)의 신호 생성기(111)에서는 디지털 신호처리수단(153)으로부터 제공되는 피드백 신호에 따라 자기장 형성 주파수(f0)를 f0+a로 변경해서 TX 안테나(120)로 입력시켜, TX 안테나(120)와 RX 안테나(130) 주변에 새로운 교류 자기장을 형성하면 신호처리수단(150)의 디지털 신호처리수단(153)은 체배 주파수도 f1+2a, f2+3a, f3+4a 등과 같이 변경한 후, RX 안테나(130)로부터 증폭기(140)를 통해 입력되는 새로운 신호를 다시 분석하여, 외부 노이즈의 주파수가 변경된 체배(감지) 주파수영역과 겹치는지 판단하고, 증폭기(140)를 통해 입력되는 신호의 주파수가 체배(감지) 주파수영역과 다시 겹칠 경우, 외부 노이즈의 주파수와 체배(감지) 주파수가 겹치지 않도록 상기의 과정을 계속 반복한다. In the signal generator (111) of the magnetic field frequency variable means (110), the magnetic field formation frequency (f0) is changed to f0+a according to the feedback signal provided from the digital signal processing means (153) and inputted to the TX antenna (120), thereby forming a new alternating magnetic field around the TX antenna (120) and the RX antenna (130). Then, the digital signal processing means (153) of the signal processing means (150) changes the multiplication frequency to f1+2a, f2+3a, f3+4a, etc., and then analyzes the new signal inputted from the RX antenna (130) through the amplifier (140) again to determine whether the frequency of the external noise overlaps with the changed multiplication (detection) frequency range, and if the frequency of the signal inputted through the amplifier (140) overlaps again with the multiplication (detection) frequency range, the above process is continuously repeated so that the frequency of the external noise and the multiplication (detection) frequency do not overlap.
즉, 자기장 주파수 가변수단(110)에서 신호처리수단(150)으로부터 제공되는 피드백 신호에 의해 교류 자기장 형성 주파수 f0를 a만큼 변경 시 신호처리수단(150)에서도 체배(감지) 주파수 영역을 f1은 f1+2a, f2는 f2+3a, f3는 f3+4a로 변경해야 한다. 신호처리수단(150)은 자기장 주파수 가변수단(110)에 피드백 신호를 제공하며, 아울러 체배(감지) 주파수도 변경한다.That is, when the frequency f0 of forming an AC magnetic field is changed by a by a feedback signal provided from the signal processing means (150) in the magnetic field frequency variable means (110), the signal processing means (150) must also change the multiplication (detection) frequency range from f1 to f1+2a, from f2 to f2+3a, and from f3 to f3+4a. The signal processing means (150) provides a feedback signal to the magnetic field frequency variable means (110) and also changes the multiplication (detection) frequency.
위와 같은 과정으로 자기장 형성 주파수(f0)를 계속 변경해 가면서 도 3의 (나)에 도시된 바와 같이 노이즈의 영향이 가장 작은 자기장 형성 주파수를 찾아 변경을 하고, 아울러 신호처리수단(150)은 체배(감지) 주파수 분포를 변경시킴으로서, 체배(감지) 주파수 분포가 주변 환경 노이즈와 이격되도록 조정되어, 보안용지 감지 시 주변 환경 노이즈의 영향을 받지 않고 보안용지를 감지할 수 있게 된다. 따라서, 본 발명의 일 실시예에 따른 보안 용지 감지 장치(100)에 의해 체배(감지) 주파수 분석이 용이해짐에 따라 보안용지 감지 오류를 줄일 수 있게 된다.By continuously changing the magnetic field formation frequency (f0) through the above process, the magnetic field formation frequency with the smallest influence of noise is found and changed as shown in (b) of FIG. 3, and at the same time, the signal processing means (150) changes the multiplication (detection) frequency distribution, thereby adjusting the multiplication (detection) frequency distribution to be separated from the surrounding environmental noise, so that the security paper can be detected without being affected by the surrounding environmental noise when detecting the security paper. Therefore, since the multiplication (detection) frequency analysis is facilitated by the security paper detection device (100) according to one embodiment of the present invention, security paper detection errors can be reduced.
이상 설명한 바와 같이, 본 발명은 상술한 특정의 바람직한 실시예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형의 실시가 가능한 것은 물론이고, 그와 같은 변경은 청구범위 기재의 범위 내에 있게 된다.As described above, the present invention is not limited to the specific preferred embodiments described above, and anyone having ordinary skill in the art to which the present invention pertains can make various modifications without departing from the gist of the present invention claimed in the claims, and such modifications are within the scope of the claims.
본 발명의 실시예에 따르면 전원 노이즈, 기타 주변 전자장비에서 발생하는 노이즈를 회피함으로써, 상기와 같은 주변 노이즈에 의해 발생할 수 있는 감지 오류의 가능성을 줄일 수 있는 보안용지 감지장치를 제공할 수 있다.According to an embodiment of the present invention, a security paper detection device can be provided that can reduce the possibility of detection errors that may occur due to the above-mentioned surrounding noise by avoiding power noise and noise generated from other surrounding electronic equipment.
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| KR1020240100679A KR20250019589A (en) | 2023-08-01 | 2024-07-30 | Security paper detection device capable of avoiding ambient noise |
| KR10-2024-0100679 | 2024-07-30 |
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|---|---|
| WO (1) | WO2025029073A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5699045A (en) * | 1996-06-06 | 1997-12-16 | Sensormatic Electronics Corporation | Electronic article surveillance system with cancellation of interference signals |
| US20040155650A1 (en) * | 2001-03-26 | 2004-08-12 | Andreas Plaas-Link | Verification method |
| KR20070090912A (en) * | 2004-12-10 | 2007-09-06 | 폴리아이씨 게엠베하 운트 코. 카게 | Identification system |
| KR20100016225A (en) * | 2007-05-04 | 2010-02-12 | 드 라 뤼 인터내셔날 리미티드 | A security document circuit |
| EP1792283B1 (en) * | 2004-09-06 | 2013-07-31 | Giesecke & Devrient GmbH | Security element having a machine-readable authenticity feature |
-
2024
- 2024-08-01 WO PCT/KR2024/011348 patent/WO2025029073A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5699045A (en) * | 1996-06-06 | 1997-12-16 | Sensormatic Electronics Corporation | Electronic article surveillance system with cancellation of interference signals |
| US20040155650A1 (en) * | 2001-03-26 | 2004-08-12 | Andreas Plaas-Link | Verification method |
| EP1792283B1 (en) * | 2004-09-06 | 2013-07-31 | Giesecke & Devrient GmbH | Security element having a machine-readable authenticity feature |
| KR20070090912A (en) * | 2004-12-10 | 2007-09-06 | 폴리아이씨 게엠베하 운트 코. 카게 | Identification system |
| KR20100016225A (en) * | 2007-05-04 | 2010-02-12 | 드 라 뤼 인터내셔날 리미티드 | A security document circuit |
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