CN105374106A - ATM bank note detection apparatus and detection method - Google Patents
ATM bank note detection apparatus and detection method Download PDFInfo
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- CN105374106A CN105374106A CN201510741312.2A CN201510741312A CN105374106A CN 105374106 A CN105374106 A CN 105374106A CN 201510741312 A CN201510741312 A CN 201510741312A CN 105374106 A CN105374106 A CN 105374106A
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Abstract
The invention discloses an ATM bank note detection apparatus and detection method. The ATM bank note detection apparatus comprises a processor, a display, an alarm, a memory, an FPGA chip, a signal collection circuit, a fixing wheel, a floating wheel located above the fixing wheel and closely attached to the fixing wheel, two rollers respectively arranged on the fixing wheel and the floating wheel, a PCB set above the floating wheel, and a reference sensor set and a signal collection sensor set which are arranged on the lower surface of the PCB and opposite to the floating wheel. The reference sensor set comprises m sensing coils, and the signal collection sensor set comprises n sensing coils, wherein n=5m, and m>=3; the m sensing coils of the reference sensor set and the n sensing coils of the signal collection sensor set are successively arranged in a column which is vertical with the bank note outlet direction of bank notes; each sensing coil is in connection with one RC oscillator circuit. The ATM bank note detection apparatus possesses the characteristics of high detection precision, great anti-interference capability and high detection efficiency.
Description
Technical field
The present invention relates to paper currency detection technical field, especially relate to a kind of accuracy of detection is high, antijamming capability is strong ATM note detection device and detection method.
Background technology
Common current vortex paper currency detection be at bank note through two to roller bearing, utilize the displacement of current vortex sensor direct-detection roller bearing to obtain the situation of bank note.Because the measurement check point for detecting bank note needs densely arranged to reach abundant detection, its testing circuit relatively intensive and the temperature variation of circuit, electromagnetic interference (EMI) etc. all have a strong impact on detection signal collection.The autonomous channel of single check point controls, and causes the shortcomings such as high cost, printed board area are large, temperature impact is large, electromagnetic interference (EMI) is large especially.
Chinese patent mandate publication number: CN103177502A, authorizes publication date on June 26th, 2013, discloses the note thickness measurement device in a kind of paper currency sorter, comprise base, thickness perception sheet metal, some PCB spiral windings, slide block, driving wheel, engaged wheel, transmission shaft and signal processing circuit, wherein, described base top is provided with cavity, and bottom is provided with described slide block, and the lug boss of described slide block stretches out described base upper surface; Described thickness perception sheet metal one end is fixed on described base top, and the other end is close to the lug boss of described slide block; Described some PCB spiral windings are arranged on the bottom of pcb board, are oppositely arranged with described thickness perception sheet metal, and form resonator cavity with the cavity in described base and described thickness perception sheet metal; Described engaged wheel is arranged on described slide block bottom, and described driving wheel is set on described transmission shaft, and relatively described engaged wheel is arranged, and described signal processing circuit is arranged on described pcb board.The weak point of this invention is, sensing coil negligible amounts, and does not consider the impact of the factors such as environment temperature, and signals collecting value is unstable, easily causes the leakage of adhesive tape coin or incomplete coin to distinguish and distinguish by mistake.
Summary of the invention
Goal of the invention of the present invention is to overcome the deficiency that in prior art, paper currency detecting method cost is high, error is large, provides a kind of accuracy of detection is high, antijamming capability is strong ATM note detection device and detection method.
To achieve these goals, the present invention is by the following technical solutions:
A kind of ATM note detection device, comprise processor, display, alarm, storer, fpga chip, signal acquisition circuit, fast pulley, be positioned at fast pulley top and the floating roller fitted tightly with fast pulley, be located at 2 roller bearings on fast pulley and floating roller respectively, be located at the pcb board above floating roller, be located at reference sensor group corresponding with floating roller on pcb board lower surface and signals collecting sensor group; Reference sensor group comprises m sensing coil, signals collecting sensor group comprises n sensing coil, n=5m, m >=3, m sensing coil of reference sensor group and n sensing coil of signals collecting sensor group be arranged in order into bank note go out the vertical row in coin direction; Each sensing coil is all connected with 1 RC oscillating circuit, the input end of signal acquisition circuit is electrically connected with the output terminal of each RC oscillating circuit respectively, the output terminal of signal acquisition circuit, fpga chip and processor are electrically connected successively, and processor is electrically connected with display, alarm and storer respectively.
The present invention introduces reference sensor group, effectively can reject the impact of environmental factor in testing result.
Ideally, the testing result of each sensing coil is the one-tenth-value thickness 1/10 of actual bank note to be measured.But the situation of reality is data acquisition device, data transmission circuit all can be subject to the impact such as ambient temperature, electromagnetic interference (EMI), and Numerical accuracy and the stability of actual testing result there will be deviation.
Such as: X+Y=a, X are one-tenth-value thickness 1/10 to be measured, a is actual detected value, and Y is environmental impact factor; H+Y=b, h are known reference one-tenth-value thickness 1/10, and b is the detected value of reference thickness;
By the detected value b of root thickness value h, environmental impact factor value Y=b-h can be obtained; Again the environmental impact factor value in testing result numerical value is rejected, actual (real) thickness value X=a-Y can be obtained.
Pcb board lower surface of the present invention is provided with the reference sensor group corresponding with floating roller and signals collecting sensor group, m sensing coil of reference sensor group and n sensing coil of signals collecting sensor group be arranged in order into bank note go out the vertical row in coin direction, by the grouping arrangement of sensing coil and the control of sampling order, the impact of electromagnetic interference (EMI) between neighboring sensor coil effectively can be reduced.
The present invention controls multiple sensing coil by differentiation frequency of operation and gathers simultaneously, prevents signal cross-talk and improves detection efficiency and accuracy of detection.
Therefore, the present invention has the advantages that accuracy of detection is high, antijamming capability is strong and detection efficiency is high.
As preferably, each RC oscillating circuit includes electric capacity C, resistance Rs and resistance RL; Resistance RL mono-termination capacitor C one end ground connection, the collection sensing coil that another termination of resistance RL is corresponding or benchmark sensing coil, resistance Rs mono-termination VCC, the resistance Rs other end connects the electric capacity C other end respectively, gathers sensing coil or the benchmark sensing coil other end.
As preferably, n sensing coil of signals collecting sensor group is divided into p=n/m group signals collecting sensor, 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, ..., p group signals collecting sensor and reference sensor group are arranged in order, and the frequency of each group sensing coil increases successively;
1st group of signals collecting sensor, the 2nd group of signals collecting sensor ..., the capacitance of the RC oscillating circuit of each sensing coil in p group signals collecting sensor and reference sensor group reduces successively.
As preferably, m is 5, described 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, ..., the first two sensing coil in p group signals collecting sensor and reference sensor group contacts, latter two sensing coil contacts, and the 3rd sensing coil and the 2nd sensing coil, is equipped with gap between the 3rd sensing coil and the 4th sensing coil.
As preferably, do not have bank note by time, floating roller and benchmark sensing coil, spacing between floating roller and signals collecting sensing coil are 0.8 to 1.3mm.
A detection method for ATM note detection device, comprises the steps:
(6-1) n sensing coil of signals collecting sensor group is divided into p=n/m group signals collecting sensor, 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, ..., p group signals collecting sensor, reference sensor group are arranged in order, and the frequency of each group sensing coil increases successively;
1st group of signals collecting sensor, the 2nd group of signals collecting sensor ..., the equal number consecutively of each sensing coil in p group signals collecting sensor, reference sensor group is S1, S2 ..., Sm;
When bank note laterally slides between fast pulley and floating roller, floating roller upwards floats, and causes the inductance value of each sensing coil to change;
(6-2)
(6-2-1) signal acquisition circuit is according to the 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, ..., the order of the sensing coil Si of p group signals collecting sensor, reference sensor group gathers the signal of the RC oscillatory circuit output of each sensing coil successively; Wherein, the initial value of i is 1;
(6-2-2) fpga chip obtains the sampled value Ref of reference sensor, the sampled value Smp of each group signals collecting sensor
1, Smp
2..., Smp
p;
Utilize formula Opp
j=Smp
j-Ref calculates and obtains detected value Opp
1, Opp
2..., Opp
p; Wherein, j is 1 ..., p;
(6-2-3) as i < m, make i value increase by 1, return step (6-2-1);
(6-3) by Opp
jin input calibration curve model, calculate the detected value W after calibration
1, W
2..., W
p, by W
1, W
2..., W
pflow to processor;
(6-4) processor obtains m group W
1, W
2..., W
p, be provided with in storer and m group W
1, W
2... W
prelevant database, processor is according to the m group W detected
1, W
2... W
pquery Database obtains banknote thickness and the bank note type corresponding with it and judges information, and display display bank note type judges information, when display show bank note be adhesive tape coin or incomplete coin time, processor control alarm equipment alarm.
As preferably, described calibration curve model utilizes following steps to obtain:
(7-1) f the corrector strip that choosing thickness increases successively laterally slides between fast pulley and floating roller successively, utilizes step (6-1) to (6-2-3) to obtain the m group detected value Opp of each corrector strip
1, Opp
2..., Opp
p;
(7-2) the m group Opp1 of each corrector strip is calculated, Opp2 ..., the mean value Opp of Oppp
on average, by thickness q and Opp of each corrector strip
on averageform point (q, an Opp
on average), obtain f point (q, Opp
on average), in two-dimensional coordinate system, consecutive point are coupled together, obtain calibration curve model.
As preferably, f is 15 to 21.
Therefore, the present invention has following beneficial effect: accuracy of detection is high, antijamming capability is strong and detection efficiency is high.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is a kind of structural representation of reference sensor group of the present invention and signals collecting sensor group;
Fig. 3 is a kind of circuit diagram of RC oscillating circuit of the present invention and sensing coil;
Fig. 4 is the one grouping schematic diagram of signals collecting sensor group of the present invention;
Fig. 5 is a kind of theory diagram of the present invention;
Fig. 6 is a kind of process flow diagram of embodiments of the invention;
Fig. 7 is a kind of calibration curve illustraton of model of the present invention.
In figure: processor 1, fpga chip 2, signal acquisition circuit 3, fast pulley 4, floating roller 5, roller bearing 6, pcb board 7, reference sensor group 8, signals collecting sensor group 9, bank note 10, RC oscillating circuit 11, display 12, alarm 13, storer 14, sensing coil 81.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment is as shown in Figure 1, Figure 2, Figure 5 a kind of ATM note detection device, comprise processor 1, display 12, alarm 13, storer 14, fpga chip 2, signal acquisition circuit 3, fast pulley 4, be positioned at fast pulley top and the floating roller 5 fitted tightly with fast pulley, be located at 2 roller bearings 6 on fast pulley and floating roller respectively, be located at the pcb board 7 above floating roller, be located at reference sensor group 8 corresponding with floating roller on pcb board lower surface and signals collecting sensor group 9; Reference sensor group comprises 5 sensing coils 81, signals collecting sensor group comprises 20 sensing coils, as shown in Figure 2,5 sensing coils of reference sensor group and 20 sensing coils of signals collecting sensor group be arranged in order into bank note go out the vertical row in coin direction; Each sensing coil is all connected with 1 RC oscillating circuit 11, the input end of signal acquisition circuit is electrically connected with the output terminal of each RC oscillating circuit respectively, the output terminal of signal acquisition circuit, fpga chip and processor are electrically connected successively, and processor is electrically connected with display, alarm and storer respectively.
As shown in Figure 3, each RC oscillating circuit includes electric capacity C, resistance Rs and resistance RL; Resistance RL mono-termination capacitor C one end ground connection, the collection sensing coil that another termination of resistance RL is corresponding or benchmark sensing coil, resistance Rs mono-termination VCC, the resistance Rs other end connects the electric capacity C other end respectively, gathers sensing coil or the benchmark sensing coil other end.
As shown in Figure 4,20 sensing coils of signals collecting sensor group are divided into 5 groups of signals collecting sensors, 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, ..., 5th group of signals collecting sensor, reference sensor group are arranged in order, and the frequency of each group sensing coil increases successively;
1st group of signals collecting sensor, the 2nd group of signals collecting sensor ..., the electric capacity C of the RC oscillating circuit of each sensing coil in the 5th group of signals collecting sensor, reference sensor group is respectively 68pF, 100pF, 120pF, 150pF, 200pF, 240pF reduce successively.
1st group of signals collecting sensor, the 2nd group of signals collecting sensor, ..., the first two sensing coil in 5th group of signals collecting sensor, reference sensor group contacts, latter two sensing coil contacts, and the 3rd sensing coil and the 2nd sensing coil, is equipped with gap between the 3rd sensing coil and the 4th sensing coil.
Do not have bank note by time, floating roller and benchmark sensing coil, spacing between floating roller and signals collecting sensing coil are 1mm.
As shown in Figure 6, a kind of detection method of ATM note detection device, comprises the steps:
Step 100, bank note laterally slides between fast pulley and floating roller
20 sensing coils of signals collecting sensor group are divided into p=4 group signals collecting sensor, 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, ..., the 4th group of signals collecting sensor, reference sensor group are arranged in order, and the frequency of each group sensing coil increases successively;
1st group of signals collecting sensor, the 2nd group of signals collecting sensor ..., the equal number consecutively of each sensing coil in the 4th group of signals collecting sensor, reference sensor group is S1, S2 ..., S5;
When bank note laterally slides between fast pulley and floating roller, floating roller upwards floats, and causes the inductance value of each sensing coil to change;
Step 200, obtains detected value
Step 210, signal acquisition circuit is according to the 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, ..., the signal that the RC oscillatory circuit that the order of the sensing coil Si of the 4th group of signals collecting sensor, reference sensor group gathers each sensing coil successively exports; Wherein, the initial value of i is 1;
Step 220, fpga chip obtains the sampled value Ref of reference sensor, the sampled value Smp of each group signals collecting sensor
1, Smp
2..., Smp
4;
Utilize formula Opp
j=Smp
j-Ref calculates and obtains detected value Opp
1, Opp
2..., Opp
4; Wherein, j is 1 ..., 4;
Step 230, as i < 5, makes i value increase by 1, returns step 210;
Step 300, calibrates detected value
By Opp
jin input calibration curve model, calculate the detected value W after calibration
1, W
2..., W
4, by W
1, W
2..., W
4flow to processor;
Step 400, display testing result, when being adhesive tape coin or worn coin alarm
Processor obtains 4 groups of W
1, W
2..., W
4, be provided with in processor and 4 groups of W
1, W
2... W
4relevant database, processor is according to the 4 groups of W detected
1, W
2... W
4query Database obtains banknote thickness and the bank note type corresponding with it and judges information, and display display bank note type judges information, when display show bank note be adhesive tape coin or incomplete coin time, processor control alarm equipment alarm.
Calibration curve model utilizes following steps to obtain:
(7-1) 16 corrector strips that choosing thickness increases successively laterally slide between fast pulley and floating roller successively, utilize step 100 to obtain 4 groups of detected value Opp of each corrector strip to 230
1, Opp
2..., Opp
5;
(7-2) 4 groups of Opp1, Opp2 of each corrector strip are calculated ..., Opp
5mean value Opp
on average, by thickness q and Opp of each corrector strip
on averageform point (q, an Opp
on average), obtain f point (q, Opp
on average), in two-dimensional coordinate system, consecutive point are coupled together, as shown in Figure 7 obtain calibration curve model.
As shown in Figure 7, have three curves of different temperatures in figure, the present invention, T=25 DEG C of detection, adopts the curve of T=25 DEG C; As seen from Figure 7, for each Opp
jall can obtain its corresponding W
j.
The thickness of 16 corrector strips is followed successively by 5,6.25,7.5,8.75,10,11.25,12.5,13.75,15,16.25,17.5,18.75,20,21.25,22.5,23.75.
Invention introduces reference sensor group, and use the relative value Opp of signals collecting sensor group and reference sensor group as sampled result (Opp=Smp-Ref), because reference sensor group and reference sensor group synchronously change with temperature, and due to the time of at every turn sampling very short, can think that within this time temperature does not change, therefore sampled result just essentially eliminates the impact of temperature.
Should be understood that the present embodiment is only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Claims (8)
1. an ATM note detection device, it is characterized in that, comprise processor (1), display (12), alarm (13), storer (14), fpga chip (2), signal acquisition circuit (3), fast pulley (4), be positioned at fast pulley top and the floating roller (5) fitted tightly with fast pulley, be located at 2 roller bearings (6) on fast pulley and floating roller respectively, be located at the pcb board (7) above floating roller, be located at reference sensor group (8) corresponding with floating roller on pcb board lower surface and signals collecting sensor group (9), reference sensor group comprises m sensing coil (81), signals collecting sensor group comprises n sensing coil, n=5m, m >=3, m sensing coil of reference sensor group and n sensing coil of signals collecting sensor group be arranged in order into bank note go out the vertical row in coin direction, each sensing coil is all connected with 1 RC oscillating circuit (11), the input end of signal acquisition circuit is electrically connected with the output terminal of each RC oscillating circuit respectively, the output terminal of signal acquisition circuit, fpga chip and processor are electrically connected successively, and processor is electrically connected with display, alarm and storer respectively.
2. ATM note detection device according to claim 1, is characterized in that, each RC oscillating circuit includes electric capacity C, resistance Rs and resistance RL; Resistance RL mono-termination capacitor C one end ground connection, the collection sensing coil that another termination of resistance RL is corresponding or benchmark sensing coil, resistance Rs mono-termination VCC, the resistance Rs other end connects the electric capacity C other end respectively, gathers sensing coil or the benchmark sensing coil other end.
3. ATM note detection device according to claim 2, it is characterized in that, n sensing coil of signals collecting sensor group is divided into p=n/m group signals collecting sensor, 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, p group signals collecting sensor and reference sensor group are arranged in order, and the frequency of each group sensing coil increases successively;
1st group of signals collecting sensor, the 2nd group of signals collecting sensor ..., the capacitance of the RC oscillating circuit of each sensing coil in p group signals collecting sensor and reference sensor group reduces successively.
4. ATM note detection device according to claim 3, it is characterized in that, m is 5, described 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, the first two sensing coil in p group signals collecting sensor and reference sensor group contacts, and latter two sensing coil contacts, and the 3rd sensing coil and the 2nd sensing coil, is equipped with gap between the 3rd sensing coil and the 4th sensing coil.
5. the ATM note detection device according to claim 1 or 2 or 3 or 4, is characterized in that, do not have bank note by time, floating roller and benchmark sensing coil, spacing between floating roller and signals collecting sensing coil are 0.8 to 1.3mm.
6. be applicable to a detection method for ATM note detection device according to claim 1, it is characterized in that, comprise the steps:
(6-1) n sensing coil of signals collecting sensor group is divided into p=n/m group signals collecting sensor, 1st group of signals collecting sensor, the 2nd group of signals collecting sensor, p group signals collecting sensor, reference sensor group are arranged in order, and the frequency of each group sensing coil increases successively;
1st group of signals collecting sensor, the 2nd group of signals collecting sensor ..., the equal number consecutively of each sensing coil in p group signals collecting sensor, reference sensor group is S1, S2 ..., Sm;
When bank note laterally slides between fast pulley and floating roller, floating roller upwards floats, and causes the inductance value of each sensing coil to change;
(6-2)
(6-2-1) signal acquisition circuit is according to the 1st group of signals collecting sensor, the 2nd group of signals collecting sensor,, the order of the sensing coil Si of p group signals collecting sensor, reference sensor group gathers the signal of the RC oscillatory circuit output of each sensing coil successively; Wherein, the initial value of i is 1;
(6-2-2) fpga chip obtains the sampled value Ref of reference sensor, the sampled value Smp of each group signals collecting sensor
1, Smp
2..., Smp
p;
Utilize formula Opp
j=Smp
jone Ref calculates and obtains detected value Opp
1, Opp
2..., Opp
p; Wherein, j is 1 ..., p;
(6-2-3) as i < m, make i value increase by 1, return step (6-2-1);
(6-3) by Opp
jin input calibration curve model, calculate the detected value W after calibration
1, W
2..., W
p, by W
1, W
2..., W
pflow to processor;
(6-4) processor obtains m group W
1, W
2..., W
p, be provided with in storer and m group W
1, W
2... W
prelevant database, processor is according to the m group W detected
1, W
1... W
2query Database obtains banknote thickness and the bank note type corresponding with it and judges information, and display display bank note type judges information, when display show bank note be adhesive tape coin or incomplete coin time, processor control alarm equipment alarm.
7. the detection method of ATM note detection device according to claim 6, is characterized in that, described calibration curve model utilizes following steps to obtain:
(7-1) f the corrector strip that choosing thickness increases successively laterally slides between fast pulley and floating roller successively, utilizes step (6-1) to (6-2-3) to obtain the m group detected value Opp of each corrector strip
1, Opp
2..., Opp
p;
(7-2) the m group Opp1 of each corrector strip is calculated, Opp2 ..., the mean value Opp of Oppp
on average, by thickness q and Opp of each corrector strip
on averageform point (q, an Opp
on average), obtain f point (q, Opp
on average), in two-dimensional coordinate system, consecutive point are coupled together, obtain calibration curve model.
8. the detection method of ATM note detection device according to claim 7, is characterized in that, f is 15 to 21.
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| Publication number | Publication date |
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| CN105374106B (en) | 2018-03-16 |
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