CN102324163B - Object identification apparatus based on radio frequency identification technology and method thereof - Google Patents
Object identification apparatus based on radio frequency identification technology and method thereof Download PDFInfo
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Abstract
The invention discloses an object identification apparatus based on radio frequency identification technology and a method thereof. The apparatus comprises a control module, a radio frequency identification reader-writer, a user interface module, a storage module and an alarm module. The control module connects with the radio frequency identification reader-writer, the storage module, the user interface module, and the alarm module respectively through a data bus. The user interface module and the storage module are connected. According to the method, initialization is completed by the user interface module, the radio frequency identification reader-writer sends a radio frequency signal and receives a return signal of a label, the control module identifies an object according to label information of the return signal and reception signal intensity indication, and the alarm module gives an alarm for an unsafe accident of the object according to an identification result. According to the method, whether an object (bottle cap) is opened or not is determined through monitoring change of the reception signal intensity indication of a label, an identification distance and an alarm parameter can be adjusted, identification functions are comprehensive, and an application range is wide.
Description
Technical field
The invention belongs to electronic technology field, further relate in the image recognition technology field implements identification device and method based on REID.The present invention can differentiate the implements true and false and anti-thefting monitoring by radio-frequency identification reader/writer reading tag information, and the present invention can also judge whether the bottle cap of implements is opened by the received signal strength indicator of judging RFID tag.
Background technology
At present, the existing method of differentiating based on the implements of REID mainly is divided into two classes: the first kind is to be applied to liquid container, Antiforge recognizing method such as drinks, Main Means is to arrange at the bottle cap place to open the RFID tag of namely destroying, and comes reading tag information to tell truth from falsehood with radio-frequency identification reader/writer; Equations of The Second Kind is the method for implements anti-thefting monitoring, and the RFID tag that relies on radio-frequency identification reader/writer regularly to read institute's discriminating implements determines whether implements are in the safe range.These two kinds of methods have certain deficiency, can only be single false proof and antitheft, can not differentiate whether container with lid is opened, in the situation that needs monitoring container with lid state can not be guaranteed the safety of container.
(patent No. ZL 200520055940.7 for the patented technology of Ren Haishen " radio-frequency (RF) identification anti-fake wine-bottle cover ", Granted publication CN2815922Y) a kind of implements identification device based on radio-frequency (RF) identification is disclosed, this device adopts the annex of or an external destruction unloading embedded at wine bottle cover, and the radio-frequency (RF) identification chip device and the antenna that are implanted into unique identity code at this annex be made, and can solve anti-pseudo problem and the warehousing management of alcohol product.The deficiency that this patented technology exists is, can only be to the discriminating of specific drinks, and can not revise in the read write line default label information and differentiate multiple drinks or implements, and this patented technology can disposablely be discerned the false from the genuine when being applied to the discriminating of alcohol product; But when being applied to other liquid containers that need to repeatedly open and preserve of non-drinks, label is destroyed when bottle cap is opened, and can't differentiate repeatedly whether implements are opened.
The patent " based on article monitoring method and the system of REID " (application number ZL201010300141.7, publication No. CN 101770683A) of He Tao application discloses a kind of for article monitoring method and the system of existing personal belongings safety management aspect based on REID.Electronic tag is being inserted by the control article by this system, utilizes card reader emission Card Reader signal that electronic tag is carried out scanning recognition, when electronic tag and card reader when exceeding monitoring range, card reader gives the alarm, thereby reaches the purpose of article monitoring.The deficiency that this patented claim technology exists is, whether this system only can monitor article whether in monitoring range, can't monitor these type of article and be opened; And alarm mode is single, and reading/writing distance is fixed, and is not suitable for the warning under the different situations.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of implements identification device and method based on REID is provided, be used for differentiating whether the bottle cap that covers implements is opened, and can make the function of Discr. thing more comprehensive, guarantees the safety of implements to be identified.
Concrete thought of the present invention is: carry out in the information of radio-frequency identification reader/writer reading rfid tags on the basis of the discriminating of the implements true and false and anti-thefting monitoring, cover the relative variation of bottle cap with the received signal strength indicator of the RFID tag of body of implements by monitoring to be identified having, judge the variable in distance of bottle cap and body, thereby whether the bottle cap of judging implements is opened.
For achieving the above object, the present invention is based on the implements identification device of REID, comprise control module, radio-frequency identification reader/writer, subscriber interface module, memory module, alarm module.Connect respectively radio-frequency identification reader/writer, memory module, subscriber interface module, alarm module by control module by data bus, subscriber interface module is connected with memory module.
Control module, be used for control radio-frequency identification reader/writer emitting radio frequency signal, the initialization of control subscriber interface module, the content of modification memory module, the preset value of control store module interior label information and received signal strength indicator and the contrast of actual detected value, the trigger alarm module is reported to the police.
Radio-frequency identification reader/writer is used in the read-write scope, sends radiofrequency signal and accept the return signal that RFID tag is launched outside the stand-by time, obtains the information of label and the actual monitoring value of received signal strength indicator.
Subscriber interface module, be used for receiving user's all operations and provide visual information to the user, visual information is generated by user interface software, is presented on the visual output device, the user checks or revises the content of memory module by this module, carry out initialization operation.
Memory module is used for the parameter setting of store alarms sound, alarm distance and type of alarm, the label information of implements to be identified, preset value and the actual monitoring value of received signal strength indicator.
Alarm module is used for differentiating requirement for different implements under the control of control module, dangerous accident is occured implements report to the police.
For achieving the above object, the present invention is based on the implements discrimination method of REID, comprise the steps:
(1) initialization
1a) user obtains label information in user interface, and radio-frequency identification reader/writer deposits label information in the memory module in as preset value behind the label that reads first implements to be identified;
1b) user deposits the radio-frequency identification reader/writer reading/writing distance of selecting in the memory module in;
The received signal strength indicator that obtains when 1c) user reads read write line first writes in the memory module as preset value;
1d) user writes the alarm parameters such as alarm sound, time of fire alarming and alarm mode that set in the memory module.
(2) transmit and receive signal
2a) radio-frequency identification reader/writer is according to step 1b) reading/writing distance that arranges begins read-write, and radio-frequency identification reader/writer periodically sends radiofrequency signal, receives the return signal of label;
2b) the firmware program analytical procedure 2a of read write line) return signal that receives obtains label information and received signal strength indicator;
2c) control module is with step 2b) label information and the received signal strength indicator that obtain write memory module as the Real-Time Monitoring value.
(3) differentiate implements
3a) control module compares the Real-Time Monitoring value of label information and the content change of preset value;
3b) the Real-Time Monitoring value of to received signal intensity indication of control module and the variation of preset value numerical value compare.
(4) whether differentiate safety
If 4a) the Real-Time Monitoring value of label information is identical with the preset value content, control module is judged to be implements safety, returns step (2), and read write line is proceeded periodically reading writing working; If content is different, it is dangerous that control module is judged to be implements, generates identification result;
If 4b) the Real-Time Monitoring value of received signal strength indicator equals preset value, control module is judged to be implements safety, returns step (2), and read write line is proceeded periodically reading writing working; If unequal, it is dangerous that control module is judged to be implements, generates identification result.
(5) report to the police
Control module is delivered to alarm module with the identification result of step (4), the work of trigger alarm module, and dangerous accident occurs with certain alarm sound, time of fire alarming and alarm mode to implements and reports to the police in alarm module.
The present invention compared with prior art has following advantage:
First, the present invention differentiates the uncap method of state of implements according to the received signal strength indicator of label, overcome deficiency and the limitation that to carry out true and false discriminating and anti-thefting monitoring in the prior art to implements, so that not only can carrying out the true and false, the present invention differentiates and anti-thefting monitoring, and can differentiate that whether cover implements is opened, and has improved the security of implements to be identified.
Second, the present invention has adopted the method for selecting the radio-frequency identification reader/writer reading/writing distance at subscriber interface module, overcome in the prior art the fixing deficiency of distance range when implements are differentiated, so that the present invention can differentiate implements in the different distance scope, range of application is more extensive.
The 3rd, the present invention has adopted the method for obtaining label information at subscriber interface module, overcome in the prior art deficiency that can not revise label information when implements are differentiated, so that the present invention can allow the user set up or change the label information of implements to be identified on their own, the implements that can be used for different labels are differentiated.
The 4th, the present invention has adopted self-defined alarm sound, time of fire alarming and the alarm mode of arranging, overcome the single deficiency of alarm mode in the prior art, so that the present invention can allow the user set up or change different alarm content on their own, can be used for the warning under the different situations.
Description of drawings
Fig. 1 is device block scheme of the present invention;
Fig. 2 is method flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing 1, device of the present invention is described further.
The present invention is based on the implements identification device of REID, comprise control module, radio-frequency identification reader/writer, subscriber interface module, memory module, alarm module.Connect respectively radio-frequency identification reader/writer, memory module, subscriber interface module, alarm module by control module by data bus, control module is controlled the reading and writing data that works in of other modules, subscriber interface module is connected with memory module, and subscriber interface module can be revised the content in the memory module.
(1) control module
Control module adopts processor CPU, Micro-processor MCV or a digital signal processor DSP chip, connect other modules by data bus, be used for the control radio-frequency identification reader/writer to the RFID tag emitting radio frequency signal of implements to be identified, and process the return signal that radio-frequency identification reader/writer receives; Control subscriber interface module initialization operation, and a content of revising writes memory module; The control store inside modules, the contrast of the label information of RFID tag and the preset value of received signal strength indicator and actual detected value; After contrast, if need to report to the police, control module is with the corresponding warning function of trigger alarm module.
(2) radio-frequency identification reader/writer
Radio-frequency identification reader/writer comprises radio frequency identification read-write chip and antenna, the read-write scope is determined by its emissive power, the periodic peripherad implements to be identified of read write line send radiofrequency signal, and the RFID tag that the receives implements to be identified return signal of launching, then, the actual monitoring value with label information and received signal strength indicator passes to memory module.Radio-frequency identification reader/writer is made of radio frequency identification read-write module and antenna, and the sweep spacing of radio-frequency identification reader/writer, emissive power and reading/writing distance can be regulated, and by the subscriber interface module setting, adapts to the read-write requirement of different distance.
(3) subscriber interface module
Subscriber interface module is used for receiving user's all operations and provides visual information to the user, subscriber interface module adopts visual graphical interfaces, comprise a visual output device and corresponding user interface software, the user checks or revises the content of memory module by this module, comprise and obtain label information, obtain received signal strength indicator, begin the options such as discriminating, and about the setting of reading/writing distance, alarm sound, time of fire alarming, alarm mode, the user can finish initialization at subscriber interface module, and the various parameter settings of differentiating implements are set.
(4) memory module
Memory module is used for the parameter setting of store alarms sound, alarm distance and type of alarm, the label information of the body of implements to be identified and the RFID tag of bottle cap, the preset value of the received signal strength indicator of label and actual monitoring value, memory module is controlled by control module, and can be revised by subscriber interface module the content of parameters.
(5) alarm module
Alarm module is used for differentiating requirement for different implements under the control of control module, dangerous accident is occured implements report to the police, and for example, carries out the true and false and differentiate warning when label information changes; Carrying out anti-thefting monitoring in the time can't reading label information reports to the police; When changing, received signal strength carries out the implements warning of uncapping.The alarm sound of alarm module, time of fire alarming, alarm mode can arrange according to user's different needs, is applied to the warning under the different situations.
Alarm sound, when referring to that alarm module is reported to the police, the concrete sound-content that sends, the user can regulate sound size harmony sound kind, to adapt to the warning needs of dissimilar different distance.
Time of fire alarming, when referring to that alarm module is reported to the police, concrete time span and the time interval, the user can regulate time span and the time interval, to adapt to the warning needs under the varying environment.
Alarm mode when referring to that alarm module is reported to the police, selects a sound and reports to the police or the vibrations warning, selects single to report to the police or repetition of alarms, and the number of times of reporting to the police, and the user can regulate these alarm modes, to adapt to the discriminating requirement of different implements.
Below in conjunction with accompanying drawing 2, method of the present invention is described further.
Step 1, initialization
The user obtains label information in user interface, radio-frequency identification reader/writer is behind the label that reads first implements to be identified, label information is deposited in the memory module as preset value, radiofrequency signal of radio-frequency identification reader/writer emission, after the RFID tag that contains the genuine piece correct information receives this signal, launch a return signal, radio-frequency identification reader/writer receives this return signal, content in the reading tag internal memory, the i.e. label information of implements to be identified.The label information of implements to be identified comprises production firm, product type, date of manufacture, product batch number, storage date, storage lot number and the implements feature of implements, deposits in the storer as the preset value of label information.
The user deposits the radio-frequency identification reader/writer reading/writing distance of selecting in the memory module in, when beginning to differentiate, control module will be called the reading/writing distance parameter that sets, the output power of radio-frequency identification reader/writer is set by data bus, the output power of radio-frequency identification reader/writer can be regulated, output power is higher, the distance of read-write is far away, and power consumption is larger, and is opposite, output power is lower, the distance of read-write is nearer, and power consumption is less, and different discriminatings requires to have determined different required distances, the user can require to arrange at subscriber interface module according to the reading/writing distance of differentiating implements work and power consumption, reaches own needed reading/writing distance.
The received signal strength indicator that the user obtains when read write line is read first writes in the memory module as preset value, when reading first, along with radio-frequency identification reader/writer receives return signal, not only can obtain label information, also can obtain received signal strength indicator.Received signal strength indicator refers to the intensity of the return signal of article tag to be identified, it changes the variable in distance that directly reflects label and read write line, distance is nearer, the value of received signal strength indicator is larger, distance is far away, the value of received signal strength indicator is less, and the preset value of this received signal strength indicator as received signal strength write in the memory module.
The user writes the alarm parameters such as alarm sound, time of fire alarming and alarm mode that set in the memory module, the particular content that arranges is alarm sound kind, time of fire alarming length and alarm mode, when beginning to report to the police, alarm module will carry out concrete warning according to user's setting.
Step 2 transmits and receives signal
Radio-frequency identification reader/writer begins read-write according to the step reading/writing distance that setting completed, radio-frequency identification reader/writer periodically sends radiofrequency signal, receive the return signal of label, at this moment the reading writing working of radio-frequency (RF) identification is periodic, every certain stand-by time emitting radio frequency signal towards periphery, stand-by time can arrange in time of fire alarming, read write line periodically receives the return signal of label, return signal being given the firmware program of read write line analyzes, after analyzing return signal, obtain label information and received signal strength indicator.
Control module writes memory module with label information and the received signal strength indicator that step obtains as the Real-Time Monitoring value, after read write line is read and write end at every turn, the Real-Time Monitoring value of this label information that obtains and received signal strength indicator is covered the value that last time, read-write obtained, namely upgrade the Real-Time Monitoring value.
Step 3 is differentiated implements
Control module compares the Real-Time Monitoring value of label information and the content change of preset value, and the real-time measurement values of label information is according to the read-write cycle property renewal of read write line, writes memory module and preset value compares, and finishes concrete discriminating.
In the process of discerning the false from the genuine, the label information that control module contrast radio-frequency identification reader/writer is received and the preset value of the label information in the memory module, if label information is identical, prove that then implements to be identified are true, control module will can the trigger alarm module not reported to the police, if label information is different, prove that then implements to be identified are false, control module is reported to the police the trigger alarm module.
In the process of anti-thefting monitoring, radio-frequency identification reader/writer periodically switched in working time and stand-by time, standby is had a rest in stand-by time, within the working time, send radiofrequency signal, and read RFID tag in its read-write scope, namely the read work of radio-frequency identification reader/writer is not to read in real time at this moment, but periodically reads.If can read label information, illustrate that implements to be identified are in the read-write scope of read write line, be in the security monitoring scope, implements do not have stolen, and control module will can the trigger alarm module not reported to the police; If can't read any label information, the label that be described this moment is in up-set condition, but not necessarily stolen, also may be that the single of radio-frequency identification reader/writer reads and loses or fault, in order to confirm the state of implements to be identified, control module will be controlled again reading tag of radio-frequency identification reader/writer, if still can't read any label information after repeatedly reading, confirm that then implements to be identified are away from the read-write scope of radio-frequency identification reader/writer, not in the security monitoring scope, illustrate that implements are stolen, control module is reported to the police the trigger alarm module.
In differentiating the process whether implements uncap, Real-Time Monitoring value and the preset value numerical value change of to received signal intensity indication of control module compare, and the real-time measurement values of received signal strength indicator is upgraded according to the read-write of read write line.The bottle cap of implements to be identified and body are placed a plurality of RFID tag, radio-frequency identification reader/writer meeting periodic transmission radiofrequency signal, and periodicity receives the received signal strength indicator of label, compare with the preset value in the memory module when the Real-Time Monitoring value of received signal strength indicator and not change, illustrate that the bottle cap of implements to be identified and the relative position of body do not change, namely bottle cap is not opened; Compare with the preset value in the memory module when real-time received signal strength indicator variation has occured, illustrate that variation has occured for the bottle cap of implements to be identified and the relative position of body, namely the bottle cap of implements to be identified is opened.
Judge by the received signal strength indicator of RFID tag whether cover implements is opened, a lot of ranges of application is arranged, for example, for some forgetful, the dull-witted patient population that maybe can not take care of oneself in the hospital and the elderly population of others' treatment of the needs in the home for destitute, in the situation that unmanned nursing, apparatus and method of the present invention can differentiate whether their medicine is opened, whether thereby monitoring them takes medicine on time, the received signal strength indicator of the bottle cap of the thing of taking medicine and the RFID tag of body changes, and proves that then medicine bottle is opened; If received signal strength indicator does not change, prove that then medicine bottle do not open, thereby by alarm module patient or paramedic are reminded.
In the container warehouse that stores poisonous harmful liquid or gas, store in the food and drink place of inebriant and food, and the container that need to repeatedly open the precious materials of taking, whether apparatus and method of the present invention can be opened in undelegated situation by the people by these containers of Real Time Monitoring, relative variation occurs with the received signal strength indicator of the label of body in the bottle cap of container to be identified, illustrate that then container opened by the people, alarm module will be reported to the police, and guarantees the safety of storage place, food and drink and the precious materials of poisonous and harmful liquid or gas.
Step 4 is differentiated whether safety of implements
After discrimination process, the internal processes of control module will be processed label information and received signal strength indicator respectively, and internal processes at first arranges the variable of the preset value of label information and received signal strength indicator, assignment when reading first; Then the variable of real-time measurement values is set, to the real-time assignment of this variable and renewal.The variable of preset value and the variable of real-time measurement values are carried out the contrast of content and numerical values recited, judge the variation of Real-Time Monitoring value and preset value, differentiate whether safety of implements with this.
If the Real-Time Monitoring value of label information is identical with the preset value content, control module is judged to be implements safety, returns to transmit and the step that receives signal, and read write line is proceeded periodically reading writing working; If content is different, it is dangerous that control module is judged to be implements, generates identification result.
If the Real-Time Monitoring value of received signal strength indicator equals preset value, control module is judged to be implements safety, returns to transmit and the step that receives signal, and read write line is proceeded periodically reading writing working; If unequal, it is dangerous that control module is judged to be implements, generates identification result.
Step 5 is reported to the police
Control module is delivered to alarm module with identification result, the work of trigger alarm module, alarm module to implements dangerous accident occurs with certain alarm sound, time of fire alarming and alarm mode reports to the police, and alarm sound, time of fire alarming and alarm mode can be selected to be set to by the user pattern of voice, music or vibration reminding according to the needs of self.
When the label information that reads and preset value not simultaneously, illustrate that band differentiates that implements are of poor quality, alarm module will send the true and false and differentiate and report to the police; When read write line can't read label information, and still can't read label information through after repeatedly reading, not in the read-write scope of read write line, namely implements to be identified are stolen for care label, and alarm module will send anti-thefting monitoring and report to the police; When the received signal strength indicator that reads and preset value not simultaneously, illustrate that the bottle cap of implements to be identified and the label position of body change, the bottle cap of implements is opened by the people, alarm module will send the implements warning of uncapping.
The alarm sound of alarm module, time of fire alarming, alarm mode can arrange according to user's different needs, is applied to different scopes.
Alarm sound, when referring to that alarm module is reported to the police, the concrete sound-content that sends, the user can regulate sound size harmony sound kind, to adapt to the warning needs of dissimilar different distance.
Time of fire alarming, when referring to that alarm module is reported to the police, concrete time span and the time interval, the user can regulate time span and the time interval, to adapt to the warning needs under the varying environment.
Alarm mode, when referring to that alarm module is reported to the police, select a sound warning, music alarm still shake warning, select single to report to the police or repetition of alarms, and the number of times of reporting to the police, and the user can regulate these alarm modes, to adapt to the discriminating requirement of different implements.
Claims (6)
1. implements discrimination method based on REID, its concrete steps are as follows:
(1) initialization
1a) user obtains label information in user interface, and radio-frequency identification reader/writer deposits label information in the memory module in as preset value behind the label that reads first implements to be identified;
1b) user deposits the radio-frequency identification reader/writer reading/writing distance of selecting in the memory module in;
The received signal strength indicator that obtains when 1c) user reads read write line first writes in the memory module as preset value;
1d) user writes alarm sound, time of fire alarming and the alarm mode that sets in the memory module;
(2) transmit and receive signal
2a) radio-frequency identification reader/writer is according to step 1b) reading/writing distance that arranges begins read-write, and radio-frequency identification reader/writer periodically sends radiofrequency signal, receives the return signal of label;
2b) the firmware program analytical procedure 2a of read write line) return signal that receives obtains label information and received signal strength indicator;
2c) control module is with step 2b) label information and the received signal strength indicator that obtain write memory module as the Real-Time Monitoring value;
(3) differentiate implements
3a) control module compares the Real-Time Monitoring value of label information and the content change of preset value;
3b) the Real-Time Monitoring value of to received signal intensity indication of control module and the variation of preset value numerical value compare;
(4) whether differentiate safety
If 4a) the Real-Time Monitoring value of label information is identical with the preset value content, control module is judged to be implements safety, returns step (2), and read write line is proceeded periodically reading writing working; If content is different, it is dangerous that control module is judged to be implements, generates identification result;
If 4b) the Real-Time Monitoring value of received signal strength indicator equals preset value, control module is judged to be implements safety, returns step (2), and read write line is proceeded periodically reading writing working; If unequal, it is dangerous that control module is judged to be implements, generates identification result;
(5) report to the police
Control module is delivered to alarm module with the identification result of step (4), the work of trigger alarm module, and dangerous accident occurs with certain alarm sound, time of fire alarming and alarm mode to implements and reports to the police in alarm module.
2. the implements discrimination method based on REID according to claim 1, it is characterized in that step 1a) described in label information comprise production firm, product type, date of manufacture, product batch number, storage date, storage lot number and the implements feature of implements.
3. the implements discrimination method based on REID according to claim 1, it is characterized in that, step 1c) received signal strength indicator described in refers to the intensity of the return signal of article tag to be identified, and it changes the variable in distance that directly reflects label and read write line.
4. the implements discrimination method based on REID according to claim 1 is characterized in that step 3a) described in the real-time measurement values of label information according to the read-write cycle property renewal of read write line.
5. the implements discrimination method based on REID according to claim 1 is characterized in that step 3b) described in the real-time measurement values of received signal strength indicator according to the read-write cycle property renewal of read write line.
6. the implements discrimination method based on REID according to claim 1, it is characterized in that, the described alarm sound of step (5), time of fire alarming and alarm mode can carry out self-defined voice, music or the vibration reminding pattern of being set to by the user.
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| CN 201110257523 CN102324163B (en) | 2011-09-01 | 2011-09-01 | Object identification apparatus based on radio frequency identification technology and method thereof |
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| CN103632489B (en) * | 2012-08-23 | 2016-10-05 | 联想(北京)有限公司 | A kind of method of information processing and electronic equipment |
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| JP6434084B1 (en) * | 2017-06-06 | 2018-12-05 | 日本耐酸壜工業株式会社 | How to manage the reuse of returnable glass bottles |
| CN108039005B (en) * | 2017-12-08 | 2019-08-27 | 成都奥尼克斯科技有限公司 | A kind of theft management system of movable object object |
| KR20200108422A (en) | 2018-01-11 | 2020-09-18 | 쉘 인터내셔날 리써취 마트샤피지 비.브이. | Wireless reactor monitoring system using passive sensor-enabled RFID tags |
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| US7474211B2 (en) * | 2005-02-22 | 2009-01-06 | Bradley Allen Kramer | System and method for killing a RFID tag |
| CN101996468A (en) * | 2009-08-13 | 2011-03-30 | 鸿富锦精密工业（深圳）有限公司 | Alarm device and alarm method |
| CN201812367U (en) * | 2010-10-09 | 2011-04-27 | 谭学鹏 | Portable RFID (Radio Frequency Identification Device) object searching device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104077627A (en) * | 2013-09-06 | 2014-10-01 | 苏州天趣信息科技有限公司 | Wireless attention device |
| CN104077627B (en) * | 2013-09-06 | 2017-12-26 | 山东领信信息科技股份有限公司 | Wireless caution device |
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| CN102324163A (en) | 2012-01-18 |
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