CN107064650B - EAS electronic tag quality parameter detector and detection method thereof - Google Patents
EAS electronic tag quality parameter detector and detection method thereof Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
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Abstract
The utility model discloses an EAS electronic tag quality parameter detector and a detection method thereof, comprising the following steps: the sensor comprises a sensitive probe, a signal processing module, a control unit, a man-machine interaction interface and a power supply module, wherein the sensitive probe comprises a transmitting coil, a left receiving coil and a right receiving coil, and the signal processing module comprises an excitation signal source unit, a differential unit, a true effective value detection unit and an A/D conversion unit. The sensitive probe of the detector has a simple structure, the detection model of the quality parameter of the electronic tag is simple, the quality parameter of the electronic tag, namely the resonant frequency F and the quality factor Q value, are rapidly and accurately measured by a frequency hopping method based on a dichotomy, and the requirements of online rapid monitoring and feedback control signal providing in the existing electronic tag production process are met.
Description
Technical field:
the utility model belongs to the technical field of commodity anti-theft systems, and particularly relates to an EAS electronic tag quality parameter-resonant frequency F and quality factor Q value detector, and relates to a sensitive probe structure and a method for detecting the resonant frequency F and the quality factor Q value.
The background technology is as follows:
the electronic commodity anti-theft system is called EAS for short, also called electronic commodity anti-theft (theft) system, and is one of commodity security measures widely adopted in the large retail industry at present. EAS is mainly composed of three parts, namely a detector, a decoder and an electronic tag. The electronic tag is divided into a soft tag and a hard tag, the soft tag has lower cost, is directly adhered to a hard commodity, and can not be reused; hard tags are more costly to dispose of than soft tags, but can be reused.
The resonant frequency F and the quality factor Q of the electronic tag are key quality parameters thereof. Referring to the prior art, ISO/IEC18046-3-2007 gives the basic specification requirements for tags for EAS systems and anti-theft detection systems. According to the above specifications, the sensing probes of the current electronic tag are generally divided into two structural models of a single coil and a double coil. Zhao Monian and Song Xiaofeng research surface single-coil probe detection methods can detect the resonance frequency of an electronic tag, but cannot analyze and calculate the Q value and other parameters of the electronic tag. Yang Chengzhong, zhu Yaping et al establish a dual-coil probe detection model by using the mutual inductance coupling principle, and parameters such as resonant frequency, Q value and effective volume of the tag can be detected by using the model, and the method has some disadvantages: 1) The coupling coefficient value of the transmitting coil and the electronic tag is increased, and the center frequency of the test is greatly shifted; 2) The coupling coefficient values of the transmitting coil and the receiving coil are gradually increased, the systematic deviation is reduced, but the bandwidth of the whole waveform is changed, namely the Q value of the tag is influenced. To overcome the above problems, the utility model patent publication No. CN 102735943B provides a passive electronic tag F and Q detection sensor for eliminating the interference between the transmitting and receiving coils. However, the sensor has a complex structure and comprises two transmitting coils and a receiving coil, wherein the transmitting coil consists of a main transmitting coil and an auxiliary transmitting coil, the receiving coil consists of the main transmitting coil and the auxiliary transmitting coil, 6 coils are actually needed to form a sensor, the coil number is large, and the manufacturing cost is high; in addition, the sensor has high requirements on the consistency of the transmitting coil and the receiving coil and the manufacturing process; further, this sensor structure does not eliminate the influence of the geomagnetic field. The utility model patent with application number 201610878253.8 improves the patent, proposes a four-coil probe structure and provides a sensor detection model, the disadvantage of the patent is that the number of coils used is still more, the early signal processing is performed through a second-order integration circuit, and the patent does not relate to the circuit design of the subsequent signal processing. In addition, the quality parameter detection of the existing electronic tag is to acquire a tag amplitude-frequency characteristic curve through a frequency sweep method, so as to obtain a resonance frequency F and a quality factor Q value, and the method has long scanning time; in the hard tag production process, the feedback signal provided by the method can not meet the requirement of rapidly positioning the insertion depth of the magnetic rod, and the production efficiency is affected.
The utility model comprises the following steps:
the utility model aims at overcoming the defects of the prior art, and provides an EAS electronic tag quality parameter detector and a detection method thereof, and relates to a sensor sensitive probe structure matched with the detector. The detector has the advantages of simple structure, high testing speed and stable operation, and can accurately measure the quality parameters of the EAS electronic tag.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
the quality parameter detector of the EAS electronic tag comprises a sensitive probe, a signal processing module, a control unit, a man-machine interaction interface and a power supply module;
the sensitive probe comprises a transmitting coil, a left receiving coil and a right receiving coil, wherein the centers of the transmitting coil, the left receiving coil and the right receiving coil are positioned on the same axis, the transmitting coil is positioned in the middle of the left receiving coil and the right receiving coil, the left receiving coil and the right receiving coil have the same structure, the left receiving coil and the right receiving coil are connected in series through a lead, and when the left receiving coil and the right receiving coil have current, the current in the left receiving coil and the right receiving coil has opposite rotating directions;
the signal processing module comprises an excitation signal source unit, a differential unit, a true effective value detection unit and an A/D conversion unit, wherein the output end of the excitation signal source unit is connected with the transmitting coil, the two input ends of the differential unit are respectively connected with the left receiving coil and the right receiving coil, the input end of the true effective value detection unit is connected with the output end of the differential unit, the input end of the A/D conversion unit is connected with the output end of the true effective value, and the output end of the A/D conversion unit is connected with the control unit;
the man-machine interaction interface and the power module are respectively connected with the control unit.
As a preferable mode of the above technical scheme, the diameter of the transmitting coil is 1.5-2.5 times of the diameter of the left receiving coil, the diameter of the left receiving coil is 1.2-1.5 times of the diameter of the electronic hard tag, and the distance between the transmitting coil and the left receiving coil and the distance between the transmitting coil and the right receiving coil are 1.3-1.8 times of the diameter of the left receiving coil.
As the optimization of the technical scheme, the transmitting coil, the left receiving coil and the right receiving coil are all rectangular plane spiral coils, the length and the width of the inner ring of the transmitting coil are 1.5-2.5 times of the length and the width of the inner ring of the left receiving coil, the length and the width of the inner ring of the left receiving coil are 1.2-1.5 times of the length and the width of the electronic soft tag, and the distance between the transmitting coil and the left receiving coil and the distance between the transmitting coil and the right receiving coil are 1.3-1.8 times of the width of the inner ring of the transmitting coil.
As the optimization of the technical scheme, the man-machine interaction interface adopts a touch screen.
As a preferable mode of the above technical solution, the power module adopts a DC-DC module.
A detection method of resonance frequency F of an EAS electronic tag comprises the following steps:
s1: test range [ F ] for determining resonant frequency F of electronic tag a ，f b ]；
S2: determining the minimum resolution epsilon of the excitation signal source and assigning f 0 ＝f a ，f 2 ＝f b ；
S3: calculate Δf= (f 2 -f 0 )/4；
S4: the control unit sends out a command to enable the excitation signal source units to sequentially generate the signals with equal amplitude and f frequency 0 、f 0 +△f、f 0 +2△f、f 0 +3△f、f 2 Is a sine wave excitation signal of (a);
s5: the control unit sequentially acquires digital quantity response signals U corresponding to the left receiving coil and the right receiving coil induction differential signals processed by the signal processing module 0 (f 0 )、U 0 (f 0 +△f)、U 0 (f 0 +2△f)、U 0 (f 0 +3△f)、U 0 (f 2 ) For U 0 (f 0 )、U 0 (f 0 +△f)、U 0 (f 0 +2△f)、U 0 (f 0 +3△f)、U 0 (f 2 ) According to 1, (f) 0 /(f 0 +△f)) 2 、(f 0 /(f 0 +2△f)) 2 、(f 0 /(f 0 +3△f)) 2 、(f 0 /f 2 ) 2 The multiple is corrected, and the frequency corresponding to the maximum value in the 5 corrected values is marked as f max 。
S6: if Deltaf is less than or equal to epsilon, f max Namely, the resonant frequency F value is used as the electronic tag, the program is ended, and otherwise, the step S7 is carried out;
s7: setting f 0 ＝f max -△f，f 2 ＝f max And +. DELTA.f, and returns to step S3.
A detection method of quality factor Q value of an EAS electronic tag comprises the following steps:
t1: acquisition of F D A value;
t2: acquisition of F U A value;
t3: according to F described D Value and the F U The value and the resonant frequency F value, and calculating and obtaining the quality factor Q value, Q=F/(F) U -F D )。
The step T1 specifically comprises the following steps:
t11: when the frequency of the excitation signal source is F value, the digital quantity response signals corresponding to the induction differential signals of the left receiving coil and the right receiving coil processed by the signal processing module are recorded as U 0 (F)，F D Find Range [ f a ，F]；
T12: assignment of f 0 ＝F，f 1 ＝f a ；
T13: calculate Δf= (f 0 -f 1 )/2；
T14: the control unit sends a command to make the excitation signal source unit generate a frequency f 1 A + [ delta ] f sine wave excitation signal;
t15: the control unit acquires a digital quantity response signal corresponding to the left receiving coil and the right receiving coil induction differential signal processed by the signal processing moduleNumber U 0 (f 1 +. DELTA.f), for U 0 (f 1 The +. DELTA.f is expressed as (F/(F) 1 +△f)) 2 The corrected value is recorded as Ux after the double correction, and the corrected value is 0.707U 0 (F) Comparing;
t16: if Ux is>0.707U 0 (F) Step T17 is entered, otherwise step T18 is entered;
t17: assignment of f 0 ＝f 0 - Δf, step T19;
t18: assignment of f 1 ＝f 1 +△f；
T19: if Deltaf is less than or equal to epsilon, f 1 I.e. as F D And (3) ending the program, otherwise, returning to the step T13.
The step T2 specifically comprises the following steps:
t21: when the frequency of the excitation signal source is F value, the digital quantity response signals corresponding to the induction differential signals of the left receiving coil and the right receiving coil processed by the signal processing module are recorded as U 0 (F)，F U Find the range [ F, F b ]；
T22: assignment of f 0 ＝F，f 2 ＝f b ；
T23: calculate Δf= (f 2 -f 0 )/2；
T24: the control unit sends a command to make the excitation signal source unit generate a frequency f 2 -a Δf sine wave excitation signal;
t25: the control unit acquires digital quantity response signals U corresponding to the left receiving coil and the right receiving coil induction differential signals processed by the signal processing module 0 (f 2 Syndrome of deficiency f), to U 0 (f 2 According to the formula (F/(F) 2 -△f)) 2 The corrected value is recorded as Ux after the double correction, and the corrected value is 0.707U 0 (F) Comparing;
t26: if Ux is>0.707U 0 (F) Step T27 is entered, otherwise step T28 is entered;
t27: assignment of f 0 ＝f 0 A + [ delta ] f, step T29 is entered;
t28: assignment of f 2 ＝f 2 -△f；
T29: if Deltaf is less than or equal to epsilon, f 2 I.e. as F U And (3) ending the program, otherwise, returning to the step T23.
The utility model has the beneficial effects that: the sensitive probe of the detector has a simple structure, the detection model of the quality parameter of the electronic tag is simple, the quality parameter of the electronic tag, namely the resonant frequency F and the quality factor Q value, are rapidly and accurately measured by a frequency hopping method based on a dichotomy, and the requirements of online rapid monitoring and feedback control signal providing in the existing electronic tag production process are met.
Description of the drawings:
the following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model. Wherein:
FIG. 1 is a block diagram of an EAS electronic tag quality parameter detector in accordance with one embodiment of the present utility model;
FIG. 2 is a schematic diagram of a preferred sensitive probe configuration for hard tag detection in accordance with one embodiment of the present utility model;
FIG. 3 is a schematic diagram of a preferred sensitive probe configuration for soft label detection in accordance with one embodiment of the present utility model;
FIG. 4 is a schematic diagram of an electronic tag circuit according to an embodiment of the present utility model;
FIG. 5 is a circuit model diagram corresponding to a sensitive probe of an embodiment of the present utility model in operation;
FIG. 6 is a schematic diagram of an excitation signal source unit circuit according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of a differential cell circuit according to one embodiment of the present utility model;
FIG. 8 is a schematic circuit diagram of a true valid value detection unit according to one embodiment of the present utility model.
The symbols in the drawings illustrate:
1-right receiving coil, 2-left receiving coil, 3-transmitting coil, 4-hard tag, 5-soft tag.
The specific embodiment is as follows:
as shown in FIG. 1, the detector for the quality parameters of the EAS electronic tag comprises a sensitive probe, a signal processing module, a control unit, a man-machine interaction interface and a power supply module.
The sensitive probe comprises a transmitting coil, a left receiving coil and a right receiving coil, wherein the centers of the transmitting coil, the left receiving coil and the right receiving coil are positioned on the same axis, the transmitting coil is positioned between the left receiving coil and the right receiving coil, the left receiving coil and the right receiving coil are identical in structure, the left receiving coil and the right receiving coil are connected in series through a lead, and when the left receiving coil and the right receiving coil have current, the current is in opposite rotating directions of the current in the left receiving coil and the right receiving coil.
Fig. 2 is a preferred sensitive probe structure for detecting the hard tag 4, in order to ensure that the sensitive probe normally acquires the quality parameter signal of the hard tag 4, when detecting the hard tag 4, the diameter of the transmitting coil 3 is more suitable than 1.5-2.5 times of the diameter of the left receiving coil 2, the diameter of the left receiving coil 2 is more suitable than 1.2-1.5 times of the diameter of the hard tag 4, and the distance between the transmitting coil 3 and the left receiving coil 2 and between the transmitting coil 1 and the right receiving coil 1 are more suitable than 1.3-1.8 times of the diameter of the left receiving coil 2.
Fig. 3 is a preferred sensitive probe structure for detecting the soft tag 5, the transmitting coil 3, the left receiving coil 2 and the right receiving coil 1 are rectangular plane spiral coils, the spiral coils can be manufactured by adopting a PCB technology, the length and width of the inner ring of the transmitting coil 3 are 1.5-2.5 times of the length and width of the inner ring of the left receiving coil 2, the length and width of the inner ring of the left receiving coil 2 are 1.2-1.5 times of the length and width of the soft tag 5, and the distance between the transmitting coil 3 and the left receiving coil 2 and the distance between the space and the space of the right receiving coil 1 are 1.3-1.8 times of the width of the inner ring of the transmitting coil 3.
The principle of operation of the sensitive probe is illustrated in the embodiment of fig. 2. First, when the hard tag 4 does not enter the probe detection area, the transmitting coil 3 is excited by an ac signal, a magnetic field is generated in a wide range around the transmitting coil 3, and the left receiving coil 2 and the right receiving coil 1 are rotated in opposite directions, so that the magnetic flux in the closed area formed by the left receiving coil 2 and the right receiving coil 1 is zero, and no induced electromotive force is generated.
Next, when the hard tag 4 to be measured is placed in the central area near the right receiving coil 1 (taking the case that the hard tag 4 to be measured is placed in the right receiving coil 1 as an example), the hard tag 4 is affected by the magnetic field of the transmitting coil 3, and an induced electromotive force is generated, and an induced current is formed in the hard tag 4, and the induced current also generates a magnetic field. The left receiving coil 2 and the right receiving coil 1 induce a magnetic field generated by the hard tag 4 to form induced electromotive force; the right receiving coil 1 is located near the hard tag 4, and is significantly affected by the magnetic field generated by the hard tag 4, while the left receiving coil 2 is located far from the electronic tag 4, and is not considered to be affected by the magnetic field induced by the hard tag 4. Therefore, when the transmitting coil 3 is excited by alternating current signals of different frequencies, the sum of the induced electromotive forces of the left receiving coil 2 and the right receiving coil 1 includes the mass information of the hard tag 4.
As shown in fig. 4-5, the working principle of the sensitive probe for acquiring the amplitude-frequency characteristic information of the electronic tag is further described from the circuit point of view.
The passive electronic tag is formed by connecting a coil and a capacitor in series, and a magnetic rod is inserted into the coil in order to improve the Q value of a quality factor of a part of the hard tag. The schematic diagram of the electronic tag circuit is shown in fig. 4. Wherein R is the internal resistance of the coil, L is the inductance value of the coil of the electronic tag, C is the capacitance value of the electronic tag, and the resonant angle frequency F of the RLC series circuit X ：
When an equivalent circuit model of the working state of the sensitive probe is analyzed, the mutual inductance coupling principle is adopted to make the coil induced voltage equivalent to a current-controlled voltage source. By the working principle of the sensitive probe, a corresponding circuit model of the probe when working is shown in figure 5. Taking the example of the measured tag being placed at the right receiving coil end, M, M in FIG. 5 1 The mutual inductance coefficients of the electronic tag, the transmitting coil and the right receiving radio coil are respectively shown, L1, L2 and L3 are respectively the equivalent inductances of the transmitting coil, the left receiving coil and the right receiving coil, and the vector relation between the transmitting coil and the tag part circuit in FIG. 5 is as follows:
the receive coil output signal is obtainable by equation (2-3):
and (3) taking the modes of the two sides of the label (4), and normalizing the amplitude-frequency characteristic curve formula (5) by the label to obtain a formula (6).
Normalized amplitude-frequency characteristic curve formula:
in the above formula (2-6), Z 1 Impedance of tag and transmitting coil, theta is current
Vector angle with the tag admittance (1/Z). From equation (6), the parameter M, M for a sensor and a detected hard tag 1 R are defined values, for a given excitation source, current +.>
And its vector angle to 1/Z are also determined. Thus, by->
Information of the hard tag T (jw) can be obtained.
The signal processing module comprises an excitation signal source unit, a differential unit, a true effective value detection unit and an A/D conversion unit. Fig. 6-8 are schematic circuit diagrams of a preferred embodiment of a portion of the unit of the signal processing module of the present utility model.
The output end of the excitation signal source unit is connected with the transmitting coil. In this embodiment, the excitation signal source unit adopts a DDS (Direct Digital Frequency Synthesis) circuit. An AD9833 chip, which is a programmable waveform generator capable of generating sine, triangular, square wave outputs, is used in fig. 6. The AD9833 does not need an external element, the output frequency and the phase can be programmed by software, the adjustment is easy, the frequency register is 28-bit, and when the main frequency clock is 25MHz, the precision is 0.1Hz. AD9833 has 3 serial interface lines, which are easily compatible with DSP and various mainstream microcontrollers. The SMA and GND terminals of the signal in fig. 6 are connected to the two ends of the transmitting coil, respectively.
And two input ends of the differential unit are respectively connected with the left receiving coil and the right receiving coil. In this embodiment, the differential unit may be implemented by a differential operational amplifier. The differential unit in fig. 7 may employ an AD8129 differential amplifier, where AD8129 is a differential to single-ended amplifier, and has an extremely high Common Mode Rejection Ratio (CMRR) at high frequencies. It can be effectively used as a high-speed instrumentation amplifier or for converting differential signals into single-ended signals. Signals SMB and SMC in fig. 7 are connected to the left receiving coil and the unconnected end of the left receiving coil. If the induced electromotive force at the two ends of the left receiving coil and the right receiving coil is too small, the differential unit preferably adopts an AD8130 differential amplifier which has a gain amplifying function.
The input end of the true effective value detection unit is connected with the output end of the differential unit, and the function of the true effective value detection unit is to convert an alternating current signal into an effective value voltage to be output. The function of the true effective value detection unit is to obtain a direct current signal of an effective value of an alternating current signal, and the true effective value detection unit of fig. 8 adopts an AD637 chip, and the AD637 can calculate a true root mean square value, a mean square value or an absolute value of any complex alternating current (or alternating current plus direct current) input waveform and provide an equivalent direct current output voltage. The SMD output of fig. 7 is connected to the SME terminal of fig. 8.
The input end of the A/D conversion unit is connected with the output end of the true effective value, and the output end of the A/D conversion unit is connected with the control unit.
The man-machine interaction interface and the power module are respectively connected with the control unit. In this embodiment, the man-machine interaction interface uses a touch screen as the man-machine interaction interface.
The power supply module adopts a DC-DC module to provide proper working voltage and energy for other modules and units.
The control unit is used for receiving the digital magnitude value of the A/D conversion unit, controlling the excitation signal source unit to generate signal excitation with different frequencies, and exchanging data with the man-machine interaction interface.
The a/D conversion unit, the control unit, the touch screen, and the power module are common knowledge in the electronic engineer industry, and the embodiments are not specifically described herein.
A detection method of resonance frequency F of an EAS electronic tag comprises the following steps:
s1: test range [ F ] for determining resonant frequency F of electronic tag a ，f b ]；
S2: determining the minimum resolution epsilon of the excitation signal source and assigning f 0 ＝f a ，f 2 ＝f b ；
S3: calculate Δf= (f 2 -f 0 )/4；
S4: the control unit sends out a command to enable the excitation signal source units to sequentially generate the signals with equal amplitude and f frequency 0 、f 0 +△f、f 0 +2△f、f 0 +3△f、f 2 Is a sine wave excitation signal of (a);
s5: the control unit sequentially acquires digital quantity response signals U corresponding to the left receiving coil and the right receiving coil induction differential signals processed by the signal processing module 0 (f 0 )、U 0 (f 0 +△f)、U 0 (f 0 +2△f)、U 0 (f 0 +3△f)、U 0 (f 2 ) For U 0 (f 0 )、U 0 (f 0 +△f)、U 0 (f 0 +2△f)、U 0 (f 0 +3△f)、U 0 (f 2 ) According to 1, (f) 0 /(f 0 +△f)) 2 、(f 0 /(f 0 +2△f)) 2 、(f 0 /(f 0 +3△f)) 2 、(f 0 /f 2 ) 2 The multiple is corrected, and the frequency corresponding to the maximum value in the 5 corrected values is marked as f max 。
S6: if Deltaf is less than or equal to epsilon, f max Namely, the resonant frequency F value is used as the electronic tag, the program is ended, and otherwise, the step S7 is carried out;
s7: setting f 0 ＝f max -△f，f 2 ＝f max And +. DELTA.f, and returns to step S3.
Wherein the frequency range [ f a ，f b ]The working range of the electronic tag can be determined, for example, the qualified working range of the sound magnetic tag of 58KHz is generally (57.8-58.2) KHz; epsilon can be determined by the signal excitation unit, e.g. the above-mentioned AD9833 chip, with a precision of 0.1Hz for a main frequency clock of 25MHz, i.e. a minimum frequency resolution epsilon of 0.1Hz.
A detection method of quality factor Q value of an EAS electronic tag, the detection method refers to a detection unit output maximum value U based on dichotomy searching true effective value max 、0.707U max A frequency hopping method corresponding to the frequency. The Q value detection method is to obtain corresponding upper and lower frequency points F when T (jw) is 0.707 U And F D Calculated according to a formula (8). The method comprises the following steps:
t1: acquisition of F D A value;
t2: acquisition of F U A value;
t3: according to F described D Value and the F U The value and the resonance frequency F value, and calculating and obtaining the quality factor Q value:
Q＝F/(F U -F D ) (8)
said step T1, i.e. find F D The method for the value specifically comprises the following steps:
t11: when the frequency of the excitation signal source is F value, the left receiving coil and the right receiving coil which are processed by the signal processing module sense the digital quantity response signal record corresponding to the differential signalIs U (U) 0 (F)，F D Find Range [ f a ，F]；
T12: assignment of f 0 ＝F，f 1 ＝f a ；
T13: calculate Δf= (f 0 -f 1 )/2；
T14: the control unit sends a command to make the excitation signal source unit generate a frequency f 1 A + [ delta ] f sine wave excitation signal;
t15: the control unit acquires digital quantity response signals U corresponding to the left receiving coil and the right receiving coil induction differential signals processed by the signal processing module 0 (f 1 +. DELTA.f), for U 0 (f 1 The +. DELTA.f is expressed as (F/(F) 1 +△f)) 2 The corrected value is recorded as Ux after the double correction, and the corrected value is 0.707U 0 (F) Comparing;
t16: if Ux is>0.707U 0 (F) Step T17 is entered, otherwise step T18 is entered;
t17: assignment of f 0 ＝f 0 - Δf, step T19;
t18: assignment of f 1 ＝f 1 +△f；
T19: if Deltaf is less than or equal to epsilon, f 1 I.e. as F D And (3) ending the program, otherwise, returning to the step T13.
Said step T2, i.e. find F U The method for the value specifically comprises the following steps:
t21: when the frequency of the excitation signal source is F value, the digital quantity response signals corresponding to the induction differential signals of the left receiving coil and the right receiving coil processed by the signal processing module are recorded as U 0 (F)，F U Find the range [ F, F b ]；
T22: assignment of f 0 ＝F，f 2 ＝f b ；
T23: calculate Δf= (f 2 -f 0 )/2；
T24: the control unit sends a command to make the excitation signal source unit generate a frequency f 2 -a Δf sine wave excitation signal;
t25: the control unit acquires the left receiving coil and the right receiving wire processed by the signal processing moduleDigital quantity response signal U corresponding to loop induction differential signal 0 (f 2 Syndrome of deficiency f), to U 0 (f 2 According to the formula (F/(F) 2 -△f)) 2 The corrected value is recorded as Ux after the double correction, and the corrected value is 0.707U 0 (F) Comparing;
t26: if Ux is>0.707U 0 (F) Step T27 is entered, otherwise step T28 is entered;
t27: assignment of f 0 ＝f 0 A + [ delta ] f, step T29 is entered;
t28: assignment of f 2 ＝f 2 -△f；
T29: if Deltaf is less than or equal to epsilon, f 2 I.e. as F U And (3) ending the program, otherwise, returning to the step T23.
The embodiment of the detector for detecting the quality parameters of the EAS electronic tag and the detection method thereof comprise the following steps: the sensor comprises a sensitive probe, a signal processing module, a control unit, a man-machine interaction interface and a power supply module, wherein the sensitive probe comprises a transmitting coil, a left receiving coil and a right receiving coil, and the signal processing module comprises an excitation signal source unit, a differential unit, a true effective value detection unit and an A/D conversion unit. The sensitive probe of the detector has a simple structure, the detection model of the quality parameter of the electronic tag is simple, the quality parameter of the electronic tag, namely the resonant frequency F and the quality factor Q value, are rapidly and accurately measured by a frequency hopping method based on a dichotomy, and the requirements of online rapid monitoring and feedback control signal providing in the existing electronic tag production process are met.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (1)
1. The detection method of the resonance frequency F of the EAS electronic tag is characterized by comprising the following steps:
s1: test range for determining resonant frequency F of electronic tagf a ，f b ]；
S2: determining minimum resolution of excitation signal sourceε，Assignment of valuef 0 =f a ，f 2 =f b ；
S3: calculate deltaf=(f 2 -f 0 )/4；
S4: the control unit sends out command to make the excitation signal source units produce amplitude equal in sequence and frequency equalf 0 、f 0 +△f、f 0 +2△f、f 0 +3△f、f 2 Is a sine wave excitation signal of (a);
s5: the control unit sequentially acquires digital quantity response signals U corresponding to the left receiving coil and the right receiving coil induction differential signals processed by the signal processing module 0 (f 0 )、U 0 (f 0 +△f)、U 0 (f 0 +2△f)、U 0 (f 0 +3△f)、U 0 (f 2 ) For U 0 (f 0 )、U 0 (f 0 +△f)、U 0 (f 0 +2△f)、U 0 (f 0 +3△f)、U 0 (f 2 ) Respectively according to the proportion of 1%f 0 /(f 0 +△f)) 2 、(f 0 /(f 0 +2△f）) 2 、(f 0 /(f 0 +3△f)) 2 、(f 0 /f 2 ) 2 The multiple is corrected, and the frequency corresponding to the maximum value in the 5 corrected values is recorded asf max ；
S6: if you can't ascendf≤ε，f max Namely, the resonant frequency F value is used as the electronic tag, the program is ended, and otherwise, the step S7 is carried out;
s7: setting upf 0 =f max -△f，f 2 =f max +△fAnd returns to step S3.
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