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To get a quote or order call: 877-450-9962 or email: [email protected] How Stuff Wor s A lac of understanding about how Electronic Article Surveillance or EAS wor s i s most often the downfall in achieving the best results. The information below w ill help you understand how it all wor s together for optimum results.
What is an EAS System? Electronic Article Surveillance (EAS) is a technological method for preventing s hoplifting. It usually involves three components: Electronic Antenna Deactivator or Detacher Electronic Tag
Special tags and labels are fixed to merchandise or boo s. These tags or labels are removed or "deactivated" by the cler s when the item is properly bought or c hec ed out. Labels are deactived using a "Label Deactivator". While ringing up purchases a cashier should pass each product label across the " Deactivation Pad". To remove a Hard Tag a cashier uses a "Detacher" which releases the pin. After a label is deactivated or a tag is removed the customer can then pass by t he antenna without any alarm. At the exits of the store, a detection system sounds an alarm or otherwise alert
s the staff when it senses active tags are passing by. Types of EAS systems and how they wor . There are several major types of electronic article surveillance systems : Magnetic or magneto-harmonic Acousto-magnetic or magnetostrictive Radio Frequency Microwave
Magnetic systems or 'Electromagnetic' (or EM) systems The tags for these systems are made of a strip of amorphous metal. An amorphous metal is a metallic material with a disordered atomic-scale structu re. In contrast to most metals, which are crystalline and therefore have a highl y ordered arrangement of atoms, amorphous alloys are non-crystalline (metglas) w hich has a very low magnetic saturation value. Except for permanent tags, this s trip is also lined with a strip of ferromagnetic. Ferromagnetism is the basic mechanism by which certain materials form permanent magnets and/or exhibit strong interactions with magnets; it is responsible for m ost phenomena of magnetism encountered in everyday life. Detection of the tag is achieved with a transmitter and receiver. The transmitter and receiver wor together to sense harmonics and sum or differe nce signals generated by the non-linear magnetic response of the material under a mixture of low-frequency (in the 10 Hz to 1000 Hz range) magnetic fields. When the ferromagnetic material is magnetized, it biases the amorphous metal str ip into saturation, where it no longer produces harmonics. Deactivation of these tags is therefore done with magnetization. Activation requires demagnetization. Due to the system being able to deactivate and re-activate this type of system is extremely suitable for libraries. Due to the convenient dimensions of the tags, and their very low cost, this syst em is popular in libraries.
Acousto-magnetic systems These tags are similar to magnetic tags in that they are made of two strips, a s trip of magnetostrictive. Magnetostriction is a property of ferromagnetic materials that causes them to ch ange their shape when subjected to a magnetic field. The effect was first identi fied in 1842 by James Joule when observing a sample of nic el called ferromagnet ic. Ferromagnetism is the basic mechanism by which certain materials form permanent magnets and/or exhibit strong interactions with magnets; it is responsible for m
ost phenomena of magnetism encountered in everyday life called amorphous metal. An amorphous metal is a metallic material with a disordered atomic-scale structu re. In contrast to most metals, which are crystalline and therefore have a highl y ordered arrangement of atoms, amorphous alloys are non-crystalline and a strip of a magnetically semi-hard metallic strip, which is used as a biasing magnet ( to increase signal strength) and to allow deactivation. These strips are not bou nd together but free to oscillate mechanically . Amorphous metals are used in such systems due to their good magnetoelastic coupl ing, which implies that they can efficiently convert magnetic energy to mechanic al vibrations.
In physics, resonance is the tendency of a system to oscillate at larger amplitu de at some frequencies than at others. These are nown as the system's resonant frequencies . At these frequencies, even small periodic driving forces can produ ce large amplitude vibrations, because the system frequency of the amorphous str ips. This causes the strip to vibrate longitudinally by magnetostriction, and wi ll continue to oscillate after the burst is over. The vibration causes a change in magnetization in the amorphous strip, which induces an AC voltage in the rece iver antenna. If this signal meets the required parameters (correct frequency, r epetition etc.) the alarm is activated. When the semi-hard magnet is magnetized, the tag is activated. The magnetized st rip ma es the amorphous strip respond much more strongly to the detectors, becau se the DC magnetic field given off by the strip offsets the magnetic anisotropy. Magnetic anisotropy is the direction dependence of a material's magnetic propert ies. A magnetically isotropic material has no preferential direction for its mag netic moment in zero field, while a magnetically anisotropic material will align its moment to an easy axis.-Sources of magnetic within the amorphous metal. The tag can also be deactivated by demagnetizing the strip, ma ing the response sma ll enough to that it will not be detected by the detectors. These tags are thic er than magnetic tags and are thus seldom used for boo s. Ho wever they are relatively inexpensive and have better detection rates (fewer fal se positives and false negatives) than magnetic tags.
Radio-frequency systems These tags are essentially an LC tan circuit. An LC circuit is a resonant circuit or tuned circuit that consists of an inducto r, represented by the letter L, and a capacitor, represented by the letter C tha t has a resonance In physics, resonance is the tendency of a system to oscillate at larger amplitu de at some frequencies than at others. These are nown as the system's resonant frequencies . At these frequencies, even small periodic driving forces can produ ce large amplitude vibrations, because the system pea anywhere from 1.75 MHz to 9.5 MHz. The most popular frequency is 8.2 MHz. Sensing is achieved by sweeping
The detectors for such tags emit periodic tonal bursts at about 58 as the resonance.
Hz, the same
around the resonant frequency and detecting the dip. Deactivation for 8.2 MHz l abel tags is achieved by detuning the circuit by partially destroying the capaci tor. A capacitor or condenser is a passive electronic component consisting of a pair of conductors separated by a dielectric. When a voltage potential difference exi sts between the conductors, an electric field is present in the dielectric. This field stores energy and produces a mechanical force. This is done by submitting the tag to a strong electromagnetic. Electromagnetism is the physics of the electromagnetic field, a field that exert s a force on particles with the property of electric charge and is reciprocally affected by the presence and motion of such particles field at the resonant freq uency which will induce voltages exceeding the capacitor's brea down voltage. The brea down voltage of an Insulator is the minimum voltage that causes a porti on of an insulator to become electrically conductive.The brea down voltage of a diode is the minimum reverse voltage to ma e the diode conduct in reverse which is artificially reduced by puncturing the tags.
Microwave systems These permanent tags are made of a non-linear element called a Diode. In electronics a diode is a two-terminal electronic component which conducts ele ctric current asymmetrically or unidirectional; that is, it conducts current mor e easily in one direction than in the opposite direction. The term usually refer s to a semiconductor diode, the most common type today, coupled to one microwave and one electrostatic antenna.
The tag acts as a mixer reemitting a combination of signals from both fields. Th is modulated signal triggers the alarm. These tags are permanent and somewhat co stly. They are mostly used in clothing stores.
About Us About Us Site Map Compare Us Faster Service Easier Install Lower Costs Products Product Overview Tags Deactivators
At the exit, one antenna emits a low-frequency (about 100 r one emits a microwave field.
Hz) field, and anothe
Antennas Rapid Service Resources How stuff wor s Security Tips The EAS advantage Stro e of Genius Support Rapid Service Repair Deactivator Support Antenna Support Label and Tag Support © 2010 Retail Theft Prevention Inc. All Rights Reserved. | Site Map | 877-450-9962
To get a quote or order call: 877-450-9962 or email: [email protected] How Stuff Wor s A lac of understanding about how Electronic Article Surveillance or EAS wor s i s most often the downfall in achieving the best results. The information below w ill help you understand how it all wor s together for optimum results.
What is an EAS System? Electronic Article Surveillance (EAS) is a technological method for preventing s hoplifting. It usually involves three components: Electronic Antenna Deactivator or Detacher Electronic Tag
Special tags and labels are fixed to merchandise or boo s. These tags or labels are removed or "deactivated" by the cler s when the item is properly bought or c hec ed out. Labels are deactived using a "Label Deactivator". While ringing up purchases a cashier should pass each product label across the " Deactivation Pad". To remove a Hard Tag a cashier uses a "Detacher" which releases the pin. After a label is deactivated or a tag is removed the customer can then pass by t he antenna without any alarm. At the exits of the store, a detection system sounds an alarm or otherwise alert
s the staff when it senses active tags are passing by. Types of EAS systems and how they wor . There are several major types of electronic article surveillance systems : Magnetic or magneto-harmonic Acousto-magnetic or magnetostrictive Radio Frequency Microwave
Magnetic systems or 'Electromagnetic' (or EM) systems The tags for these systems are made of a strip of amorphous metal. An amorphous metal is a metallic material with a disordered atomic-scale structu re. In contrast to most metals, which are crystalline and therefore have a highl y ordered arrangement of atoms, amorphous alloys are non-crystalline (metglas) w hich has a very low magnetic saturation value. Except for permanent tags, this s trip is also lined with a strip of ferromagnetic. Ferromagnetism is the basic mechanism by which certain materials form permanent magnets and/or exhibit strong interactions with magnets; it is responsible for m ost phenomena of magnetism encountered in everyday life. Detection of the tag is achieved with a transmitter and receiver. The transmitter and receiver wor together to sense harmonics and sum or differe nce signals generated by the non-linear magnetic response of the material under a mixture of low-frequency (in the 10 Hz to 1000 Hz range) magnetic fields. When the ferromagnetic material is magnetized, it biases the amorphous metal str ip into saturation, where it no longer produces harmonics. Deactivation of these tags is therefore done with magnetization. Activation requires demagnetization. Due to the system being able to deactivate and re-activate this type of system is extremely suitable for libraries. Due to the convenient dimensions of the tags, and their very low cost, this syst em is popular in libraries.
Acousto-magnetic systems These tags are similar to magnetic tags in that they are made of two strips, a s trip of magnetostrictive. Magnetostriction is a property of ferromagnetic materials that causes them to ch ange their shape when subjected to a magnetic field. The effect was first identi fied in 1842 by James Joule when observing a sample of nic el called ferromagnet ic. Ferromagnetism is the basic mechanism by which certain materials form permanent magnets and/or exhibit strong interactions with magnets; it is responsible for m
ost phenomena of magnetism encountered in everyday life called amorphous metal. An amorphous metal is a metallic material with a disordered atomic-scale structu re. In contrast to most metals, which are crystalline and therefore have a highl y ordered arrangement of atoms, amorphous alloys are non-crystalline and a strip of a magnetically semi-hard metallic strip, which is used as a biasing magnet ( to increase signal strength) and to allow deactivation. These strips are not bou nd together but free to oscillate mechanically . Amorphous metals are used in such systems due to their good magnetoelastic coupl ing, which implies that they can efficiently convert magnetic energy to mechanic al vibrations.
In physics, resonance is the tendency of a system to oscillate at larger amplitu de at some frequencies than at others. These are nown as the system's resonant frequencies . At these frequencies, even small periodic driving forces can produ ce large amplitude vibrations, because the system frequency of the amorphous str ips. This causes the strip to vibrate longitudinally by magnetostriction, and wi ll continue to oscillate after the burst is over. The vibration causes a change in magnetization in the amorphous strip, which induces an AC voltage in the rece iver antenna. If this signal meets the required parameters (correct frequency, r epetition etc.) the alarm is activated. When the semi-hard magnet is magnetized, the tag is activated. The magnetized st rip ma es the amorphous strip respond much more strongly to the detectors, becau se the DC magnetic field given off by the strip offsets the magnetic anisotropy. Magnetic anisotropy is the direction dependence of a material's magnetic propert ies. A magnetically isotropic material has no preferential direction for its mag netic moment in zero field, while a magnetically anisotropic material will align its moment to an easy axis.-Sources of magnetic within the amorphous metal. The tag can also be deactivated by demagnetizing the strip, ma ing the response sma ll enough to that it will not be detected by the detectors. These tags are thic er than magnetic tags and are thus seldom used for boo s. Ho wever they are relatively inexpensive and have better detection rates (fewer fal se positives and false negatives) than magnetic tags.
Radio-frequency systems These tags are essentially an LC tan circuit. An LC circuit is a resonant circuit or tuned circuit that consists of an inducto r, represented by the letter L, and a capacitor, represented by the letter C tha t has a resonance In physics, resonance is the tendency of a system to oscillate at larger amplitu de at some frequencies than at others. These are nown as the system's resonant frequencies . At these frequencies, even small periodic driving forces can produ ce large amplitude vibrations, because the system pea anywhere from 1.75 MHz to 9.5 MHz. The most popular frequency is 8.2 MHz. Sensing is achieved by sweeping
The detectors for such tags emit periodic tonal bursts at about 58 as the resonance.
Hz, the same
around the resonant frequency and detecting the dip. Deactivation for 8.2 MHz l abel tags is achieved by detuning the circuit by partially destroying the capaci tor. A capacitor or condenser is a passive electronic component consisting of a pair of conductors separated by a dielectric. When a voltage potential difference exi sts between the conductors, an electric field is present in the dielectric. This field stores energy and produces a mechanical force. This is done by submitting the tag to a strong electromagnetic. Electromagnetism is the physics of the electromagnetic field, a field that exert s a force on particles with the property of electric charge and is reciprocally affected by the presence and motion of such particles field at the resonant freq uency which will induce voltages exceeding the capacitor's brea down voltage. The brea down voltage of an Insulator is the minimum voltage that causes a porti on of an insulator to become electrically conductive.The brea down voltage of a diode is the minimum reverse voltage to ma e the diode conduct in reverse which is artificially reduced by puncturing the tags.
Microwave systems These permanent tags are made of a non-linear element called a Diode. In electronics a diode is a two-terminal electronic component which conducts ele ctric current asymmetrically or unidirectional; that is, it conducts current mor e easily in one direction than in the opposite direction. The term usually refer s to a semiconductor diode, the most common type today, coupled to one microwave and one electrostatic antenna.
The tag acts as a mixer reemitting a combination of signals from both fields. Th is modulated signal triggers the alarm. These tags are permanent and somewhat co stly. They are mostly used in clothing stores.
About Us About Us Site Map Compare Us Faster Service Easier Install Lower Costs Products Product Overview Tags Deactivators
At the exit, one antenna emits a low-frequency (about 100 r one emits a microwave field.
Hz) field, and anothe
Antennas Rapid Service Resources How stuff wor s Security Tips The EAS advantage Stro e of Genius Support Rapid Service Repair Deactivator Support Antenna Support Label and Tag Support © 2010 Retail Theft Prevention Inc. All Rights Reserved. | Site Map | 877-450-9962
