CN108734847A - A kind of bank note thickness measuring method and device based on 3-axis acceleration sensor - Google Patents
A kind of bank note thickness measuring method and device based on 3-axis acceleration sensor Download PDFInfo
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- CN108734847A CN108734847A CN201810059233.7A CN201810059233A CN108734847A CN 108734847 A CN108734847 A CN 108734847A CN 201810059233 A CN201810059233 A CN 201810059233A CN 108734847 A CN108734847 A CN 108734847A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/16—Testing the dimensions
- G07D7/164—Thickness
Abstract
The invention discloses a kind of bank note thickness measuring method and device based on 3-axis acceleration sensor, the device mainly includes pedestal, circuit board, drive sprocket axle, passive thickness measuring wheel shaft, thickness measuring bracket, sheet metal, eddy current coil, thickness measuring mounting plate, extension bearing and 3-axis acceleration sensors.When work, banknote passes through in the gap between drive sprocket axle and passive thickness measuring wheel shaft, passive thickness measuring wheel shaft is jacked up in banknote across moment, the vibration is transmitted on the extension bearing of end, to be transmitted on the top of thickness measuring mounting plate, since 3-axis acceleration sensor is mounted on top, therefore, the delicate variations of passive thickness measuring wheel shaft can be directly delivered on 3-axis acceleration sensor, by receiving the signal on 3-axis acceleration sensor and being handled according to thickness measuring method provided by the present invention, the thickness value of every banknote and corresponding vibration regularity can be obtained.
Description
Technical field
The present invention relates to paper currency sorter field more particularly to a kind of bank note thickness measuring sides based on 3-axis acceleration sensor
Method and device.
Background technology
With the continuous development of scientific and technological progress, paper currency sorter is as the essential bank note sorting of bank and financial company
Equipment, use scope are more and more extensive.Recent year becomes forge money to be occurred again and again, and bank requires constantly to carry to paper currency sorting
Height has become cleaning-sorting machine necessary functions to the detection of note surface adhesive tape.Banknote thickness gauge is as cleaning-sorting machine key structure portion
Part seriously constrains the development of cleaning-sorting machine since its domestic technology is not yet ripe.
Have infrared thickness measuring, ultrasonic thickness measurement and Hall thickness measuring in existing thickness measurement technology.Infrared thickness measuring be easy by
The influence of note surface spot, it is undesirable to no-reflection bank note bur detection result, cause the erroneous judgement to banknote thickness.Ultrasound
Wave thickness measuring is very high to structural requirement, it is necessary to assure banknote smoothly passes, and for the bank note of high-speed cruising, batch production is difficult to protect
Demonstrate,prove the steady of bank note.The principle of Hall thickness measuring is the thickness that induced field variable quantity judges bank note, due to bearing and elastic wheel
All it is metal structure, is easy band magnetic and interference is generated to Hall sensor.
Have banknote thickness gauge, such as number of patent application in the prior art：201620182548.7 the applying date：2016 3
The moon 10, patent name：Banknote thickness gauge, this application discloses a kind of using eddy current coil as the bank note of detection original paper
Measuring thickness device, between sheet metal and eddy current coil which is caused by detecting the displacement that passive thickness measuring wheel movable end generates
Gap changes, and so that the impedance at eddy current coil end and induction reactance is generated variation to judge the thickness of bank note, essence is measured to improve
Degree and jamproof ability.This application improves the measurement accuracy and anti-interference ability of banknote thickness gauge to a certain extent,
But this application remains unchanged the wink that the fast vibration of measuring thickness device work, especially bank note can not be inhibited to hit bottom roller on measuring thickness device
Between, it can cause significantly to rise, no longer be bonded note surface, current vortex sensor is unable to measure the banknote thickness at crosses paper money initial stage,
So that measuring thickness device whether pastes gummed paper in detection bank note front end or there are there are errors when dog-ear equal thickness abnormal problem.
Therefore, the prior art requires further improvement and perfect.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of easy to operate, accuracy of identification it is high based on
The bank note thickness measuring method of 3-axis acceleration sensor.
Another object of the present invention is to overcome the deficiencies of the prior art and provide a kind of dress based on above-mentioned thickness measuring method
It sets.
The purpose of the invention is achieved by the following technical solution：
A kind of bank note thickness measuring method based on 3-axis acceleration sensor, lid thickness measuring method mainly include the following steps：
Step S1：3-axis acceleration sensor is mounted on to the upper left corner of extended axis, and the X-axis of setting measurement is vertically to go out
Paper money axis vertically downward direction, Y-axis are the horizontal left direction of vertical cash dispenser axis, and Z axis is to be parallel to cash dispenser axis inward direction.
Step S2：System electrification, three 3-axis acceleration sensors respectively measure the acceleration of three axial directions, and with
Data collecting card connect, after calculating obtain measuring thickness device installation when angle of inclination, while to the acceleration of cash dispenser axis into
Row is corrected.
Step S3：When measurement, the piezoelectric element in 3-axis acceleration sensor generates piezoelectricity when by applied external force F
Constant：
Formula 1：
Formula 2 as available from the above equation：Q=d*F, wherein Q are the quantity of electric charge, and d is piezoelectric constant, and F is the power being subject to；By above formula with
Newton's second law formula 3：F=m*a is combined and is obtained formula 4：Q=d*m*a, wherein d and m make pottery in the piezoelectricity of acceleration transducer
Ceramic material and mass block are fixed values after determining, obtain Q and a is in a linear relationship, can be added to obtain three axis by measuring charge Q
The acceleration value of velocity sensor.
Step S4：3-axis acceleration sensor by measured value in the form of analog voltage it is filtered after be conveyed to data acquisition
Analog quantity is AD converted by card, data collecting card, and is exported to computer disposal.
Step S5：Start computer, and parameter initialization is carried out to computer, sets D/A output datas as 0, it is ensured that just
Beginning, state piezoelectric actuator was without driving voltage signal.
Step S6：Formula 5 is obtained by formula 4：To avoid interference of the high-frequency signal to sensor, to result
Low-pass filtering is carried out, Acceleration Formula 6 is obtained：Ai is i moment acceleration values
Sampled value.
Step S7：Integral is carried out to formula 6 and obtains formula 7：Δ
Time differences of the t between double sampling.
Step S8：Formula 7 is integrated, displacement formula 8 can be obtained：
Wherein vi is the sampled value of i moment speed.
Step S9：Repeat crosses paper money to test several times, and according to the observation of vibrating effect and storage data analysis, repeatedly
Control parameter is adjusted, then calculates the displacement for obtaining cash dispenser axis, module is sent out by radio communication, and whether bank note is detected with this
Paste gummed paper and its position.
As the present invention preferred embodiment, in order to improve the precision of measurement, the present invention when no bank note passes through cash dispenser axis,
The vibration that measuring thickness device generates when rotating makes acceleration transducer output voltage fuctuation within a narrow range above or below 1.2V；Pass through when there is bank note
When cash dispenser axis, bank note squeezes cash dispenser axis, and cash dispenser axis is made to drive acceleration transducer up-down vibration, to be converted to physical signal
Electric signal, it is adjacent between wave crest it is essentially identical.
As the preferred embodiment of the present invention, in order to keep thickness measuring system work more stable, reliable, in step S5 of the present invention
Parameter initialization include control algolithm parameter initial value setting, the corresponding initial value of data collecting card, control address and drive
The setting of flowing mode.
As the preferred embodiment of the present invention, in order to further increase sensitivity and the measurement accuracy of thickness measuring system, the present invention
The 3-axis acceleration sensor uses model ADXL327 3-axis acceleration sensors, and measurement range is big, high sensitivity,
Broader bandwidth, be affected by temperature it is smaller, it is at low cost, thickness measuring requirement can be met well.
As the preferred embodiment of the present invention, the data collecting card uses Agilent data collecting card.Compared to other numbers
According to capture card, Agilent data collecting card model is more, and performance is stablized, it is connect using general rather than propriety standard high speed USB 2.0
Mouthful, it easily connects, plug and play, and bundle and provide Keysight Modular Instruments Measurement
Manger softwares can quickly be arranged and carry out data processing.In addition, also compatible a variety of applied software development environment, by dry
The situation disturbed is seldom.
As the preferred embodiment of the present invention, since measuring thickness device is during the installation process or after longtime running, installation site
Can run-off the straight, cause measurement accuracy inaccurate, thus the present invention the installation of 3-axis acceleration sensor occur deviation or
Caused by there is deformation aging when installation site run-off the straight, X-axis and the acceleration of gravity side of 3-axis acceleration sensor
To no longer parallel, the acceleration that X-axis is surveyed at this time is only the one-component of active thickness measuring wheel up and down motion acceleration, if X-axis
Angle between acceleration of gravity is θ, and the output of X-axis is AXOUT, Y-axis output is AYOUT, Z axis output is AOUTZ, then angle theta
Calculation formula be formula 9：
The actual acceleration A that the up and down motion of active thickness measuring wheel can be released according to angle theta is formula 10：
Integral is carried out to formula 10 and obtains formula 11：Δ t between double sampling when
Between it is poor；Formula 11 is integrated again, displacement formula 12 can be obtained：Wherein
viIt is the sampled value of i moment speed.Above-mentioned design or adjustment can cope with such case well, so that it is guaranteed that reaching higher
The requirement of measurement accuracy.
Another object of the present invention is achieved through the following technical solutions：
A kind of banknote thickness gauge based on 3-axis acceleration sensor, the measuring thickness device mainly include pedestal, circuit board,
Drive sprocket axle, thickness measuring bracket, sheet metal, eddy current coil, thickness measuring mounting plate, extends bearing and for surveying at passive thickness measuring wheel shaft
Measure the 3-axis acceleration sensor of passive thickness measuring wheel shaft vibration regularity.The drive sprocket axle is located at below passive thickness measuring wheel shaft, with
Passive thickness measuring wheel shaft is arranged in parallel, and is connect with passive thickness measuring axle friction.The pedestal fixed setting, is located at passive thickness measuring wheel
The side of axis；The passive thickness measuring wheel shaft is arranged on thickness measuring bracket, and the thickness measuring bracket is mounted on pedestal, is rotated with pedestal
Connection.One end of the sheet metal is fixed on pedestal, and the other end is connected on thickness measuring bracket, is driven above and below it by thickness measuring bracket
Vibration.The eddy current coil provides in the top of sheet metal, and circuit board electrical connection, by circuit board detecting its between sheet metal
Spacing.
Specifically, the thickness measuring mounting plate is equipped with the connecting hole for connecting passive thickness measuring wheel shaft and is convenient for measuring
The fluting of vibration.The extension bearing is mounted in connecting hole, and the end of the passive thickness measuring wheel shaft is inserted into connecting hole, is passed through
Extension bearing is connect with thickness measuring mounting plate, and vibration when measuring is passed to thickness measuring mounting plate.It is described to slot from thickness measuring mounting plate
One side edge extend to the other side thickness measuring mounting plate be divided into the top for measurement and the lower part for installation, top with
It is not fully divided between lower part.It is described to slot and not through thickness measuring mounting plate.The 3-axis acceleration sensor setting
On the top of thickness measuring mounting plate, and and circuit board electrical connection.When work, banknote is between drive sprocket axle and passive thickness measuring wheel shaft
It being passed through in gap, passive thickness measuring wheel shaft is jacked up in banknote across moment, which is transmitted on the extension bearing of end,
To be transmitted on the top of thickness measuring mounting plate, since 3-axis acceleration sensor is mounted on top, passive thickness measuring wheel shaft
Delicate variations can be directly delivered on 3-axis acceleration sensor, pass through receive 3-axis acceleration sensor on signal
And handle, the thickness value of every banknote and corresponding vibration regularity can be obtained.
Further, in order to obtain more accurate vibration regularity, to improve measurement accuracy, thickness measuring installation of the present invention
Plate lower part is additionally provided with the second 3-axis acceleration sensor for improving measurement accuracy, and second 3-axis acceleration sensor is set
It sets on the corner of lower part, with circuit board electrical connection.
As the preferred embodiment of the present invention, in order to which vibration more fine crushing can be amplified and be reacted to three axis positioned at end
Acceleration transducer, 3-axis acceleration sensor of the present invention are arranged in the upper corner of thickness measuring mounting plate.
Working process and principle of the invention are：When work, between banknote is between drive sprocket axle and passive thickness measuring wheel shaft
It being passed through in gap, passive thickness measuring wheel shaft is jacked up in banknote across moment, which is transmitted on the extension bearing of end, from
And be transmitted on the top of thickness measuring mounting plate, since 3-axis acceleration sensor is mounted on top, passive thickness measuring wheel shaft
Delicate variations can be directly delivered on 3-axis acceleration sensor, by receiving the signal on 3-axis acceleration sensor simultaneously
It is handled according to thickness measuring method provided by the present invention, the thickness value of every banknote and corresponding vibration regularity can be obtained.
The vibration of cash dispenser axis, judges whether the thickness of bank note is deposited according to its vibration regularity when detecting bank note crosses paper money using acceleration transducer
In exception, it can detect and whether paste gummed paper on bank note or there are dog-ear equal thickness abnormal conditions, it might even be possible to determine
Gummed paper position and size, and it is easy to operate, it is of low cost, expand the application range of 3-axis acceleration sensor.
Compared with prior art, the present invention has further the advantage that：
(1) 3-axis acceleration sensor provided by the present invention have bandwidth, quality is small, easy for installation, wiring is few, knot
The compact advantage of structure is realized using the reasonable Arrangement scheme combination filtering algorithm of 3-axis acceleration sensor to measuring thickness device
The measurement of cash dispenser axis vibration displacement substantially increases the precision of measuring thickness device.
(2) the bank note thickness measuring method provided by the present invention based on 3-axis acceleration sensor by eddy current detection original paper with
Acceleration transducer is combined, using eddy current coil as detection original paper, by the position for detecting passive thickness measuring wheel movable end generation
Shifting amount and the gap of sheet metal and eddy current coil caused change, and the impedance of eddy current coil and induction reactance is made to change to sentence
The thickness of disconnected bank note, to improve the thickness measuring precision and anti-interference ability of measuring thickness device, while acceleration transducer ensure that
The stability and accuracy that the banknote thickness at crosses paper money initial stage measures.
(3) the bank note thickness measuring method provided by the present invention based on 3-axis acceleration sensor using original paper to ring
The magnetic field in border is not responding to, and extraneous magnetic disturbance does not interfere with the normal measurement of thickness.
(4) the bank note thickness measuring method provided by the present invention based on 3-axis acceleration sensor is using three axis for extending bearing
Acceleration transducer installation method eliminates the upper and lower axle caused position not exclusively parallel with acceleration of gravity of acceleration transducer
Shift measurement error can greatly improve the computational accuracy of displacement, ensure the accuracy of measuring thickness device
Description of the drawings
Fig. 1 is the structural schematic diagram of the banknote thickness gauge provided by the present invention based on 3-axis acceleration sensor.
Fig. 2 is the scheme of installation of 3-axis acceleration sensor provided by the present invention.
Fig. 3 is three axis normal place schematic diagram of 3-axis acceleration sensor provided by the present invention.
Schematic diagram when Fig. 4 is 3-axis acceleration sensor run-off the straight provided by the present invention.
Fig. 5 is processing acceleration transducer data flowchart provided by the present invention.
Label declaration in above-mentioned attached drawing：
1- pedestals, 2- drive sprocket axles, the passive thickness measuring wheel shafts of 3-, 4- thickness measuring brackets, 5- sheet metals, 6- thickness measuring mounting plates, 7-
Extend bearing, 8- 3-axis acceleration sensors.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, develop simultaneously embodiment pair referring to the drawings
The present invention is described further.
Embodiment 1：
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the invention discloses a kind of bank note based on 3-axis acceleration sensor
Thickness measuring method, lid thickness measuring method mainly include the following steps：
Step S1：3-axis acceleration sensor 8 is mounted on to the upper left corner of extended axis, and the X-axis of setting measurement is vertical
Cash dispenser axis vertically downward direction, Y-axis are the horizontal left direction of vertical cash dispenser axis, and Z axis is to be parallel to cash dispenser axis inward direction.
Step S2：System electrification, three 3-axis acceleration sensors 8 respectively measure the acceleration of three axial directions, and
It is connect with data collecting card, angle of inclination when measuring thickness device installation is obtained after calculating, while to the acceleration of cash dispenser axis
It is modified.
Step S3：When measurement, the piezoelectric element in 3-axis acceleration sensor 8 generates pressure when by applied external force F
Electric constant：
Formula 1：
Formula 2 as available from the above equation：Q=d*F, wherein Q are the quantity of electric charge, and d is piezoelectric constant, and F is the power being subject to；By above formula with
Newton's second law formula 3：F=m*a is combined and is obtained formula 4：Q=d*m*a, wherein d and m make pottery in the piezoelectricity of acceleration transducer
Ceramic material and mass block are fixed values after determining, obtain Q and a is in a linear relationship, can be added to obtain three axis by measuring charge Q
The acceleration value of velocity sensor 8.
Step S4：3-axis acceleration sensor 8 by measured value in the form of analog voltage it is filtered after be conveyed to data and adopt
Analog quantity is AD converted by truck, data collecting card, and is exported to computer disposal.
Step S5：Start computer, and parameter initialization is carried out to computer, sets D/A output datas as 0, it is ensured that just
Beginning, state piezoelectric actuator was without driving voltage signal.
Step S6：Formula 5 is obtained by formula 4：To avoid interference of the high-frequency signal to sensor, to result
Low-pass filtering is carried out, Acceleration Formula 6 is obtained：Ai is i moment acceleration values
Sampled value.
Step S7：Integral is carried out to formula 6 and obtains formula 7：Δ
Time differences of the t between double sampling.
Step S8：Formula 7 is integrated, displacement formula 8 can be obtained：
Wherein vi is the sampled value of i moment speed.
Step S9：Repeat crosses paper money to test several times, and according to the observation of vibrating effect and storage data analysis, repeatedly
Control parameter is adjusted, then calculates the displacement for obtaining cash dispenser axis, module is sent out by radio communication, and whether bank note is detected with this
Paste gummed paper and its position.
As the present invention preferred embodiment, in order to improve the precision of measurement, the present invention when no bank note passes through cash dispenser axis,
The vibration that measuring thickness device generates when rotating makes acceleration transducer output voltage fuctuation within a narrow range above or below 1.2V；Pass through when there is bank note
When cash dispenser axis, bank note squeezes cash dispenser axis, and cash dispenser axis is made to drive acceleration transducer up-down vibration, to be converted to physical signal
Electric signal, it is adjacent between wave crest it is essentially identical.
As the preferred embodiment of the present invention, in order to keep thickness measuring system work more stable, reliable, in step S5 of the present invention
Parameter initialization include control algolithm parameter initial value setting, the corresponding initial value of data collecting card, control address and drive
The setting of flowing mode.
As the preferred embodiment of the present invention, in order to further increase sensitivity and the measurement accuracy of thickness measuring system, the present invention
The 3-axis acceleration sensor 8 uses model ADXL327 3-axis acceleration sensors, and measurement range is big, high sensitivity,
Broader bandwidth, be affected by temperature it is smaller, it is at low cost, thickness measuring requirement can be met well.
As the preferred embodiment of the present invention, the data collecting card uses Agilent data collecting card.Compared to other numbers
According to capture card, Agilent data collecting card model is more, and performance is stablized, it is connect using general rather than propriety standard high speed USB 2.0
Mouthful, it easily connects, plug and play, and bundle and provide Keysight Modular Instruments Measurement
Manger softwares can quickly be arranged and carry out data processing.In addition, also compatible a variety of applied software development environment, by dry
The situation disturbed is seldom.
As the preferred embodiment of the present invention, since measuring thickness device is during the installation process or after longtime running, installation site
Can run-off the straight, cause measurement accuracy inaccurate, thus the present invention the installation of 3-axis acceleration sensor 8 occur deviation or
Caused by there is deformation aging when installation site run-off the straight, X-axis and the acceleration of gravity side of 3-axis acceleration sensor 8
To no longer parallel, the acceleration that X-axis is surveyed at this time is only the one-component of active thickness measuring wheel up and down motion acceleration, if X-axis
Angle between acceleration of gravity is θ, and the output of X-axis is AXOUT, Y-axis output is AYOUT, Z axis output is AOUTZ, then angle theta
Calculation formula be formula 9：
The actual acceleration A that the up and down motion of active thickness measuring wheel can be released according to angle theta is formula 10：
Integral is carried out to formula 10 and obtains formula 11：Time differences of the Δ t between double sampling；Again
Formula 11 is integrated, displacement formula 12 can be obtained：Wherein viWhen being i
Carve the sampled value of speed.Above-mentioned design or adjustment can cope with such case well, so that it is guaranteed that reaching higher measurement essence
The requirement of degree.
Another object of the present invention is achieved through the following technical solutions：
A kind of banknote thickness gauge based on 3-axis acceleration sensor, the measuring thickness device include mainly pedestal 1, circuit
Plate, drive sprocket axle 2, passive thickness measuring wheel shaft 3, thickness measuring bracket 4, sheet metal 5, eddy current coil, thickness measuring mounting plate 6, extension bearing 7,
And the 3-axis acceleration sensor 8 for measuring passive 3 vibration regularity of thickness measuring wheel shaft.The drive sprocket axle 2 is located at passive survey
The lower section of thick wheel shaft 3, is arranged in parallel with passive thickness measuring wheel shaft 3, and with passive 3 frictional connection of thickness measuring wheel shaft.The fixation of the pedestal 1 is set
It sets, is located at the side of passive thickness measuring wheel shaft 3；The passive thickness measuring wheel shaft 3 is arranged on thickness measuring bracket 4, and the thickness measuring bracket 4 is pacified
On pedestal 1, it is rotatablely connected with pedestal 1.One end of the sheet metal 5 is fixed on pedestal 1, and the other end is connected to thickness measuring branch
On frame 4, its up-down vibration is driven by thickness measuring bracket 4.The eddy current coil provides, in the top of sheet metal 5, to be electrically connected with circuit board
It connects, by its spacing between sheet metal 5 of circuit board detecting.
Specifically, the thickness measuring mounting plate 6 is equipped with the connecting hole for connecting passive thickness measuring wheel shaft 3 and is convenient for surveying
Measure the fluting of vibration.The extension bearing 7 is mounted in connecting hole, and the end of the passive thickness measuring wheel shaft 3 is inserted into connecting hole,
It is connect with thickness measuring mounting plate 6 by extending bearing 7, vibration when measuring is passed into thickness measuring mounting plate 6.It is described to slot from thickness measuring
The one side edge of mounting plate 6 extends to the other side to be divided into thickness measuring mounting plate 6 for the top of measurement and is held for pacifying
Portion is not fully divided between top and lower part.It is described to slot and not through thickness measuring mounting plate 6.The 3-axis acceleration
Sensor 8 is arranged on the top of thickness measuring mounting plate 6, and and circuit board electrical connection.When work, banknote is from drive sprocket axle 2 and passively
It is passed through in gap between thickness measuring wheel shaft 3, passive thickness measuring wheel shaft 3 is jacked up in banknote across moment, which, which is transmitted to, is located at
On the extension bearing 7 of end, to be transmitted on the top of thickness measuring mounting plate 6, since 3-axis acceleration sensor 8 is mounted on upper
Portion, therefore, the delicate variations of passive thickness measuring wheel shaft 3 can be directly delivered on 3-axis acceleration sensor 8, by receiving three
Signal on axle acceleration sensor 8 and processing can obtain the thickness value of every banknote and corresponding vibration regularity.
Further, in order to obtain more accurate vibration regularity, to improve measurement accuracy, thickness measuring installation of the present invention
6 lower part of plate is additionally provided with the second 3-axis acceleration sensor 8 for improving measurement accuracy, second 3-axis acceleration sensor
8 are arranged on the corner of lower part, with circuit board electrical connection.
As the preferred embodiment of the present invention, in order to which vibration more fine crushing can be amplified and be reacted to three axis positioned at end
Acceleration transducer 8,3-axis acceleration sensor 8 of the present invention are arranged in the upper corner of thickness measuring mounting plate 6.
Working process and principle of the invention are：When work, banknote is between drive sprocket axle 2 and passive thickness measuring wheel shaft 3
It is passed through in gap, passive thickness measuring wheel shaft 3 is jacked up in banknote across moment, which is transmitted to the extension bearing 7 positioned at end
On, to be transmitted on the top of thickness measuring mounting plate 6, since 3-axis acceleration sensor 8 is mounted on top, passive to survey
The delicate variations of thick wheel shaft 3 can be directly delivered on 3-axis acceleration sensor 8, by receiving 3-axis acceleration sensor
Signal on 8 is simultaneously handled according to thickness measuring method provided by the present invention, and the thickness value and correspondence of every banknote can be obtained
Vibration regularity.The vibration of cash dispenser axis, judges bank note according to its vibration regularity when detecting bank note crosses paper money using acceleration transducer
Thickness with the presence or absence of abnormal, can detect and whether paste gummed paper on bank note or there are dog-ear equal thickness abnormal conditions,
Even it can determine gummed paper position and size, and easy to operate, it is of low cost, expand the application of 3-axis acceleration sensor 8
Range.
Embodiment 2：
A kind of banknote thickness gauge, including pedestal 1, circuit board and at least two mechanism for measuring thick, the mechanism for measuring thick packet
Driving wheel, passive thickness measuring wheel, thickness measuring wheel support and sheet metal 5 are included, circuit board is set to the top of engine base, the thickness measuring wheel support
Turning end be articulated in the movable end of thickness measuring wheel support, the sheet metal 5 that the circuit board corresponds to each mechanism for measuring thick is equipped with vortex
Coil, the sheet metal 5 are set on engine base and between eddy current coil and thickness measuring wheel support, the first end of the sheet metal 5
On engine base, the second end of sheet metal 5 is connected on the movable end of thickness measuring wheel support and below eddy current coil, the master
Driving wheel be set to passive thickness measuring wheel side and with passive thickness measuring wheel frictional drive, between the driving wheel and passive thickness measuring wheel between
Gap is crosses paper money gap.
The present apparatus is by battery, power module, 3-axis acceleration sensor 8, data collecting card, wireless communication module, calculating
Machine forms.Battery and power module generate the required power supply of whole device, three axial directions of measurement of 3-axis acceleration sensor 8
Acceleration, data collecting card are acquired acceleration information, correct and data are conveyed to calculating by wireless communication module
Machine is modified data by filtering algorithm, and calculates displacement, to detect the true and false of bank note.
The installation site of the present apparatus, as shown in Figure 2.Thickness measuring mechanical structure is made of acceleration transducer and extended axis, is expanded
Showing shaft is held 7 and is screwed on paper money counter.When bank note enters cash dispenser axis, cash dispenser axis squeezes extension bearing 7, makes its drive
Acceleration transducer moves.By analyze acceleration transducer output voltage changing rule can detect that bank note thickness whether
There are exceptions.
Bank note thickness measuring method specific operation process provided by the present invention is as follows：
1) present invention is powered the present apparatus using battery, and battery is connected with power supply plate, and power module generates stabilization
Voltage, and power to acceleration transducer, data collecting card and wireless communication module.
2) then acceleration is acquired, carries out crosses paper money experiment, which measures three by 3-axis acceleration sensor 8
A axial acceleration, and acceleration is defeated by data collecting card in the form of analog quantity.
3) acceleration transducer that the present apparatus uses, model ADXL327.The sensor is the list of AD companies of U.S. production
Chip three-axis sensor, measurement range are ± 2.5g, can bear the vibratory impulse of 1000g.The chip can measure three simultaneously
The acceleration in a direction is suitable for static and dynamic acceleration analysis.Tri- pin difference of Xout, Yout and Zout of chip
It is the acceleration output of X-axis, Y-axis and Z axis, wherein X-axis is used to measure the acceleration of upper and lower directions, and Y-axis is for measuring right and left
To acceleration, Z axis is for measuring acceleration in the front-back direction.In the circuit, ADXL327 supply voltages Vs is 3.3V, sensitive
Degree is 462mV/g, when measured value is 0g, output voltage values Vs/2, i.e. 1.65V, and when acceleration changes, respective shaft
Output voltage changes, therefore by measuring a certain axis output voltage size, can calculate the acceleration of the axis.
4) output of 3-axis acceleration sensor 8 is transported to data collecting card, data acquisition in the form of voltage analog
Card is AD converted the analog quantity of input, and the size of acceleration is indicated with digital quantity.
5) when mechanism for measuring thick works, the piezoelectric element in 3-axis acceleration sensor 8 can produce after by applied external force F
Raw piezoelectric constant：
So charge Q=d*F (2)；
Wherein Q is the quantity of electric charge, and d is piezoelectric constant, and F is the power being subject to.In apparatus of the present invention suffered by acceleration transducer
If the inertia force that is generated with note output shaft vibration of mass block of advocating.According to Newton's second law F=m*a (3)；
Inertia force is multiplied by acceleration equal to mass block, formula (2) (3) is combined, Q=d*m*a (4) can be obtained；Wherein
D and m is exactly fixed value after the piezoceramic material and mass block of acceleration transducer determine.Therefore, in sensor can
Within the scope of survey, Q and a are in a linear relationship, can characterize acceleration value by charge Q.
6) vibration information is obtained using computer, what 3-axis acceleration sensor 8 exported is voltage signal, there is formula (4)
Known toTo avoid interference of the high-frequency signal to sensor, low-pass filtering is carried out to its result, obtains accelerationAi is i moment acceleration sampled values.
7) after indicating speed in the form of digital quantity, then the X-axis of acceleration transducer and the folder of acceleration of gravity are calculated
Angle, the acceleration exported to X-axis using the angle are modified.When device installation is correct and without any deformation, add
The direction of the X-axis of velocity sensor, Y-axis and Z axis is as shown in Figure 3.X-axis is with acceleration of gravity direction on the contrary, for measuring actively
The acceleration of thickness measuring wheel upper and lower directions；Y-axis is used to measure the acceleration of left and right directions；Z axis is for measuring acceleration in the front-back direction
Degree.The output of X-axis at this time is exactly the acceleration that active thickness measuring wheel moves up and down.
8) when deviation occurs in the installation of device or since aging deforms, device is it is possible that tilt, acceleration
The X-axis of sensor and acceleration of gravity direction are no longer parallel, and the acceleration that X-axis is surveyed at this time is only that active thickness measuring wheel is transported up and down
The one-component of dynamic acceleration.As shown in Figure 4.If the angle between X-axis and acceleration of gravity is θ, the output of X-axis is AXOUT,
Y-axis output is AYOUT, and Z axis output is AOUTZ, then angle theta is：
Can release the actual acceleration A that active thickness measuring wheel moves up and down according to angle θ is：
9) by the amendment to X-axis acceleration, the actual acceleration of active thickness measuring wheel up and down motion can be calculated, up and down
Dead point is two extreme values of acceleration, by the period of motion that can find out active thickness measuring wheel to the judgement of extreme value.By to one
In a period, the quadratic integral of acceleration can calculate the displacement of active thickness measuring wheel in one cycle.
10) formula (8) is integrated, i.e.,Δ t is
Time difference between double sampling.
11) formula (9) is integrated, displacement formula can be obtained
Wherein vi is the sampled value of i moment speed.
12) MATLAB is used to carry out process chart to acceleration sensor outputs signals as shown in Figure 5.When there is no bank note
When passing through cash dispenser axis, the vibration that measuring thickness device generates when rotating makes acceleration transducer output voltage small amplitude wave above or below 1.2V
It is dynamic；When there is bank note to pass through cash dispenser axis, bank note overstocks cash dispenser axis, and cash dispenser axis is made to drive acceleration transducer up-down vibration, to
Physical signal is converted into electric signal, it is adjacent between wave crest it is essentially identical.
13) repeat crosses paper money to test several times, and according to the observation of vibrating effect and storage data analysis, adjust repeatedly
Control parameter.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (9)
1. a kind of bank note thickness measuring method based on 3-axis acceleration sensor, which is characterized in that include the following steps：
Step S1：3-axis acceleration sensor is mounted on to the upper left corner of extended axis, and the X-axis of setting measurement is vertical cash dispenser axis
Vertically downward direction, Y-axis are the horizontal left direction of vertical cash dispenser axis, and Z axis is to be parallel to cash dispenser axis inward direction；
Step S2：System electrification, three 3-axis acceleration sensors respectively measure the acceleration of three axial directions, and and data
Capture card connects, and angle of inclination when measuring thickness device installation is obtained after calculating, while repairing to the acceleration of cash dispenser axis
Just；
Step S3：When measurement, it is normal that the piezoelectric element in 3-axis acceleration sensor generates piezoelectricity when by applied external force F
Number：
Formula 1：
Formula 2 as available from the above equation：Q=d*F, wherein Q are the quantity of electric charge, and d is piezoelectric constant, and F is the power being subject to；By above formula and newton
Second law formula 3：F=m*a is combined and is obtained formula 4：The piezoelectric ceramics material of Q=d*m*a, wherein d and m in acceleration transducer
Material and mass block are fixed values after determining, obtain Q and a is in a linear relationship, can obtain 3-axis acceleration by measuring charge Q
The acceleration value of sensor；
Step S4：3-axis acceleration sensor by measured value in the form of analog voltage it is filtered after be conveyed to data collecting card,
Analog quantity is AD converted by data collecting card, and is exported to computer disposal；
Step S5：Start computer, and parameter initialization is carried out to computer, sets D/A output datas as 0, it is ensured that initial shape
State piezoelectric actuator is without driving voltage signal；
Step S6：Formula 5 is obtained by formula 4：To avoid interference of the high-frequency signal to sensor, result is carried out low
Pass filter obtains Acceleration Formula 6：Ai samples for i moment acceleration values
Value；
Step S7：Integral is carried out to formula 6 and obtains formula 7：Δ t is two
Time difference between secondary sampling；
Step S8：Formula 7 is integrated, displacement formula 8 can be obtained：Wherein
Vi is the sampled value of i moment speed；
Step S9：Repeat crosses paper money to test several times, and according to the observation of vibrating effect and storage data analysis, adjusts repeatedly
Control parameter, then the displacement for obtaining cash dispenser axis is calculated, module is sent out by radio communication, detects whether bank note is pasted with this
Gummed paper and its position.
2. the bank note thickness measuring method according to claim 1 based on 3-axis acceleration sensor, which is characterized in that when not having
When bank note passes through cash dispenser axis, the vibration that measuring thickness device generates when rotating keeps acceleration transducer output voltage small size above or below 1.2V
Fluctuation；When there is bank note to pass through cash dispenser axis, bank note squeezes cash dispenser axis, and cash dispenser axis is made to drive acceleration transducer up-down vibration, from
And physical signal is converted into electric signal, it is adjacent between wave crest it is essentially identical.
3. the bank note thickness measuring method according to claim 1 based on 3-axis acceleration sensor, which is characterized in that the step
Parameter initialization in rapid S5 includes the initial value setting of control algolithm parameter, the corresponding initial value of data collecting card, control ground
The setting of location and type of drive.
4. the bank note thickness measuring method according to claim 1 based on 3-axis acceleration sensor, which is characterized in that described three
Axle acceleration sensor uses model ADXL327 3-axis acceleration sensors.
5. the bank note thickness measuring method according to claim 1 based on 3-axis acceleration sensor, which is characterized in that the number
Agilent data collecting card is used according to capture card.
6. the bank note thickness measuring method according to claim 1 based on 3-axis acceleration sensor, which is characterized in that when three axis
Caused by the installation of acceleration transducer deviation occurs or deformation occurs aging when installation site run-off the straight, three axis add
The X-axis of velocity sensor and acceleration of gravity direction are no longer parallel, and the acceleration that X-axis is surveyed at this time is only on active thickness measuring wheel
The one-component of lower acceleration of motion, if the angle between X-axis and acceleration of gravity is θ, the output of X-axis is AXOUT, Y-axis output
For AYOUT, Z axis output is AOUTZ, then the calculation formula of angle theta is formula 9：
The actual acceleration A that the up and down motion of active thickness measuring wheel can be released according to angle theta is formula 10：
Integral is carried out to formula 10 and obtains formula 11：Time differences of the Δ t between double sampling；It is right again
Formula 11 is integrated, and displacement formula 12 can be obtained：Wherein viIt is the i moment
The sampled value of speed.
7. a kind of banknote thickness gauge based on 3-axis acceleration sensor, which is characterized in that including pedestal, circuit board, active
Wheel shaft, passive thickness measuring wheel shaft, thickness measuring bracket, sheet metal, eddy current coil, thickness measuring mounting plate, extension bearing and 3-axis acceleration
Sensor；The drive sprocket axle is located at below passive thickness measuring wheel shaft, is arranged in parallel with passive thickness measuring wheel shaft, and with passive thickness measuring wheel
Axis frictional connection；The pedestal fixed setting, is located at the side of passive thickness measuring wheel shaft；The passive thickness measuring wheel shaft is arranged in thickness measuring
On holder, the thickness measuring bracket is mounted on pedestal, is rotatablely connected with pedestal；One end of the sheet metal is fixed on pedestal,
The other end is connected on thickness measuring bracket, its up-down vibration is driven by thickness measuring bracket；The eddy current coil regulation is in the upper of sheet metal
Side, and circuit board electrical connection, by its spacing between sheet metal of circuit board detecting；
The thickness measuring mounting plate is equipped with the connecting hole for connecting passive thickness measuring wheel shaft and the fluting convenient for measurement vibration；
The extension bearing is mounted in connecting hole, and the end of the passive thickness measuring wheel shaft is inserted into connecting hole, by extend bearing with
Thickness measuring mounting plate connects, and vibration when measuring is passed to thickness measuring mounting plate；One side edge of the fluting from thickness measuring mounting plate
Extend to the other side and thickness measuring mounting plate is divided into the top for measurement and the lower part for installation；It is described fluting and not through
Thickness measuring mounting plate；The 3-axis acceleration sensor is arranged on the top of thickness measuring mounting plate, and and circuit board electrical connection.
8. the banknote thickness gauge according to claim 7 based on 3-axis acceleration sensor, which is characterized in that the survey
Thick mounting plate lower part is additionally provided with the second 3-axis acceleration sensor for improving measurement accuracy, and second 3-axis acceleration passes
Sensor is arranged on the corner of lower part, with circuit board electrical connection.
9. the banknote thickness gauge according to claim 7 based on 3-axis acceleration sensor, which is characterized in that described three
Axle acceleration sensor is arranged in the upper corner of thickness measuring mounting plate.
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| CN106296971A (en) * | 2016-08-31 | 2017-01-04 | 东方通信股份有限公司 | A kind of note surface paste high precision test identification system and method |
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| CN101802645A (en) * | 2007-05-24 | 2010-08-11 | 企鹅自动化系统公司 | Subsurface positioning system and method for monitoring movement underground |
| CN102364311A (en) * | 2011-08-31 | 2012-02-29 | 中国人民解放军军械工程学院 | Six-degree of freedom vibration absolute measuring method based on triaxial acceleration sensor array |
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