CN107146320B - A kind of paper currency sorting supersonic detection device and method - Google Patents
A kind of paper currency sorting supersonic detection device and method Download PDFInfo
- Publication number
- CN107146320B CN107146320B CN201710221185.2A CN201710221185A CN107146320B CN 107146320 B CN107146320 B CN 107146320B CN 201710221185 A CN201710221185 A CN 201710221185A CN 107146320 B CN107146320 B CN 107146320B
- Authority
- CN
- China
- Prior art keywords
- signal
- module
- paper currency
- bank note
- currency sorting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D11/00—Devices accepting coins; Devices accepting, dispensing, sorting or counting valuable papers
- G07D11/10—Mechanical details
- G07D11/16—Handling of valuable papers
- G07D11/165—Picking
-
- 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
- G07D7/06—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 using wave or particle radiation
- G07D7/08—Acoustic waves
-
- 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
- G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
- G07D7/185—Detecting holes or pores
-
- 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
- G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
- G07D7/187—Detecting defacement or contamination, e.g. dirt
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention relates to a kind of paper currency sorting supersonic detection device and methods, described device includes: a main control module, one drive module, multiple transmitting transducers, multiple reception energy converters, one amplification conditioning module, one analog-to-digital conversion module and a matched filtering module, the paper currency sorting supersonic detection device and method that the embodiment of the present invention provides, the mode emitted simultaneously by using positive and negative modulating signal of frequency modulation, it is applied to ultrasonic score-clearing system, solve the problems, such as that signal power existing for existing apparatus is insufficient and adjacency channel has interference and leads to detect bank note low efficiency, paper currency detection efficiency is greatly improved, especially suitable for needing the scene of high speed detection bank note.
Description
Technical field
The present invention relates to ultrasound examination field more particularly to a kind of paper currency sorting supersonic detection device and methods.
Background technique
With the development of Chinese national economy, bank note cash flow flux constantly increases in the market, and note in circulation is damaged to be accounted for
Than big, point version fastidious to bank note is all an extremely difficult problem in each business bank.The cash of most of financial institutions is whole
The fastidious work of point still relies on heavy manual operations and carries out, and causes large labor intensity, time long, there is also labour health conditions
The problem of difference.Meanwhile each business bank will match paper money to ATM quite a lot daily, and reach according to People's Bank of China's paper money issued by a provincial bank to be circulated in a given area
Storage damage certificate and complete certificate are turned in the requirement new to seventy percent, and it is difficult to realize to rely solely on manual operations.
Paper currency sorting process gives accurately the various states of bank note incompleteness, damaged, hole and the various adhesive tapes of stickup
Identification and judgement, are a vital technical indicators in paper currency sorting technology.
The G&D company of 1970s Germany produces First cash checking machine in the world, by grinding for financial machine and tool
It carrys out the coffin upon burial to intelligentized direction.DeLaRue, Japan Glory Company also research and develop the cleaning-sorting machine of oneself therewith.In state
It is interior, since nineteen nineties, since Chinese national economy enters the high speed development stage, bank note cash flow in the market
Sustainable growth, demand of the banking to high-tech automates constantly are promoted, and it is a large amount of that intelligentized cash checking machine has become processing
The indispensable tool of cash.
Paper currency sorter is a kind of effective tool for improving banking efficiency, as a kind of showing with high-tech content
Golden processing equipment, integrated use electronic computer technology, mode identification technology, authentication detection technology, system control technique and
Precision machinery manufacturing technology realizes the target for replacing manually carrying out bank note sorting processing with Intelligentized mechanical, just increasingly wider
It is applied to the financial field in China generally.
Existing ultrasound paper currency sorting system, using non-contact air ultrasound scheme, 16 (being more or less than 16) hairs
Energy converter transmitting ultrasonic signal is penetrated, the signal strength received by the reception energy converter of different location is distinguished without bank note, 1 paper
Coin and multiple bank note and bank note have adhesive tape state, and overall structure is as shown in Figure 1.
Differentiated using supersonic sensing device, according to ultrasonic signal transmission principle, by collected banknote thickness
It is converted to ultrasonic wave and receives voltage signal, achieve the purpose that improve Signal-to-Noise by the technologies such as amplifying, filtering, finally by micro-
Processor sampling carries out processing data information according to Ultrasonic Radiation power, and overall structure is as shown in Figure 2.
In order to clearly describe the device, the detection course of work of single transducer is described first.As shown in figure 3,
Single unit system includes transmit circuit plate 12, transmitting transducer 3, ultrasonic wave transmitting frid 11, banknote path 10, ultrasonic wave receiving slit
Plate 9 receives energy converter 4 and circuit board for receiving 8.
Transmitting transducer is really to be worked using the resonant state of piezo-electric crystal.When its two poles of the earth external signal,
When its frequency is equal to the natural mode shape of piezoelectric patches, piezoelectric chip will resonate, and generate ultrasonic signal.
Ultrasonic wave can be radiated according to certain angle to front, and the signal of acoustic irradiation angle is as shown in Figure 4.
Ultrasound is generated by transmitting transducer, is radiated in space, and ultrasonic energy a part is reflected by bank note, and a part is by paper
Coin absorbs, and a part penetrates bank note continuation and propagates forward, and the ultrasonic wave for penetrating bank note travels to again to be received on energy converter.16 connect
It receives energy converter and faces transmitting transducer placement, every road receives energy converter and ultrasonic signal is converted to electric signal, and electric signal is successively
After pre-amplification circuit, filter circuit etc., microprocessor is entered by acquisition and is handled, then each circuit-switched data is carried out
Processing, judges whether bank note has glued adhesive tape, the data of judgement is finally sent to cleaning-sorting machine main control processor.
But it in actual cleaning-sorting machine ultrasonic testing system, has the following problems:
1, underpower.Firstly, the high-selenium corn of high band ultrasonic wave is lost in air, the aerial acoustic pressure decaying of ultrasound
Factor beta and frequency f's is square directly proportional, therefore for the ultrasonic wave of upper frequency, propagate to decay rapidly in air,
Such as the ultrasound propagated in the air of 500kHz, attenuation coefficient 40dB/m；Secondly, air (acoustic impedance Z=
Acoustic wave energy reflection loss caused by the huge acoustic impedance difference of the interface 420Rayl)/solid (acoustic impedance Z > 10Mrayl), one
Hair one is received in the ultrasound detection of formula or internal loopback formula, need from acoustic wave excitation end to final reception by 4 gas/solid interfaces or
4 solid/gas interface, such as since impedance mismatching insertion loss achieved reaches 140dB between air/aluminium interface, hair receipts.
In addition, causing signal to vary widely if bank note is slightly shaken between energy converter.If can be improved ultrasonic signal has
Power is imitated, then facilitates the complexity for reducing ultrasound detection.
2, there is interference in adjacency channel.It is changed as shown in figure 5, the radiation field of adjacency channel there are cross-cutting issue, needs to increase
The spacing of energy device, reduces cross jamming.Current technology can reduce interference there are two types of method: the first, it is adjacent by being arranged
Channel does not work at the same time, for example, working at the same time every 2-3 energy converter, then adjacency channel is worked alternatively, and reduces whole detection
Speed reduces interfering with each other for adjacency channel to reach.Another, increases the spacing of adjacency channel, but sacrifices clear
Extension set has lost reliability for the coverage rate of bank note.From the two aspects, it is all unable to reach the mesh of efficient detection bank note
's.
Summary of the invention
The present invention provides a kind of paper currency sorting supersonic detection device and methods, in order to reduce answering for ultrasound detection
The interference of miscellaneous degree and adjacency channel, realizes efficient detection bank note.
To achieve the goals above, first aspect present invention provides a kind of paper currency sorting supersonic detection device, the dress
It sets and includes:
One main control module, including a judgment module, connect with drive module and Signal Matching filter module, for controlling not
Signal transmitting and reception, matched filtering and channels operation state with channel；
One drive module, connect with main control module, for driving multiple transmitting transducers；
Multiple transmitting transducers, connect with drive module, for turning to the signal after drive module power amplification
It changes, and converts the signals to ultrasonic signal and emit；
Multiple reception energy converters are accordingly set to multiple transmitting transducer sides, for receiving multiple transmitting transducer hairs
That penetrates penetrates the ultrasonic signal of bank note, and ultrasonic signal is converted to electric signal；
One amplification conditioning module, connect, for each received telecommunications of channel reception energy converter with multiple reception energy converters
It number amplifies and improves to improve the signal-to-noise ratio of electric signal；
One analog-to-digital conversion module, the analog signal for issuing signal amplification conditioning module are converted to digital signal；
One matched filtering module is connect with signal amplification conditioning module, for the digital signal after conversion to be sent to master
It controls in module, matched filtering operation is carried out by digital signal of the main control module to each channel.
Further, multiple transmitting transducer laid out in parallel, are distributed in the different zones of bank note.
Further, multiple transmitting transducers are distributed according to the width direction of bank note.
Further, multiple transmitting transducers are distributed according to the length direction of bank note.
Further, multiple reception energy converter laid out in parallel, are distributed in the different zones of bank note.
Further, multiple energy converters that receive are distributed according to the width direction of bank note.
Further, multiple energy converters that receive are distributed according to the length direction of bank note.
Further, transmitting transducer is equal with the quantity of energy converter is received.
Further, main control module is a microprocessor.
Second aspect, the present invention also provides a kind of methods of paper currency sorting ultrasound detection, and the method includes following steps
It is rapid:
S1: calculating the positive and negative driving digital signal of the different in width on different channels, is driven and is driven using the digital signal
Dynamic model block, and the positive or negative high voltage signal of different in width is obtained to drive multiple transmitting transducers by drive module；
S2: the signal after drive module power amplification is converted into ultrasonic signal and is sent out by multiple transmitting transducers
It penetrates；
S3: paper is penetrated by multiple reception energy converters reception transmitting transducer transmittings being arranged corresponding to transmitting transducer
The ultrasonic signal of coin, and ultrasonic signal is converted into electric signal；
S4: the electric signal after being received to each channel reception energy converter, according to the bandwidth feature for receiving energy converter, to electricity
Signal is amplified and is improved to improve the signal-to-noise ratio of electric signal；
S5: after carrying out analog-to-digital conversion to the signal after amplification and conditioning, the signal is sent in main control module, is passed through
The main control module carries out matched filtering operation using digital signal of the matched signal to each channel；
S6: to after each channel matched filtering signal carry out envelope processing, and to the signal after each channel envelope processing into
Row voltage decision process, judges the state of bank note part.
Preferably, positive and negative driving digital signal specific steps are calculated are as follows:
(1) positive and negative FM signal is calculated, calculation formula is as follows:
Wherein, fcIt is the center frequency point for receiving energy converter for carrier frequency, B, which is signal-to-noise ratio, receives energy converter when being -40dB
Bandwidth, upper and lower Frequency point is respectively fc- B/2 and fc+ B/2, signal time length T=40/fc, chirp rate K=B/T, s1
(t) be positive modulating signal of frequency modulation, s2(t) be negative modulating signal of frequency modulation,For rectangular signal,
(2) binaryzation is carried out to positive and negative FM signal, obtains the positive and negative driving digital signal of different in width.
Preferably, the method for carrying out envelope processing to the signal after each channel matched filtering is to demodulate detection using absolute value
Or Hilbert transformation demodulation.
Preferably, carrying out the specific steps of matched filtering by ultrasonic signal of the main control module to each channel includes: measurement
The single frequency response for receiving energy converter, according to the frequency of the frequency response of the reception energy converter of measurement and Analog-digital Converter,
Inverting receives energy converter discrete impulse response, and matched filtering module is to emit the convolution of signal and discrete impulse response.
Paper currency sorting supersonic detection device provided by the invention and method, it is adjacent logical by using multiple transmitting transducers
The signal of the transmitting transducer transmitting in road can satisfy positive frequency modulation modulation and negative frequency modulation modulation is used alternatingly.The present invention can be brought
The important benefit of following two points:
1, positive frequency modulation modulation and negative frequency modulation modulation is used alternatingly as transmitting signal, carries out matched filtering when receiving signal
When, the negative frequency modulation modulated signal and the correlation of positive frequency modulation modulated signal of adjacency channel are very small, and positive frequency modulation modulated signal
It is related very big, so that interfering with each other minimum.
2, high-frequency ultrasonic signal propagates very faint in air, and the signal bandwidth of transmitting transducer transmitting is relatively narrow.Using
Frequency modulation modulate emission signal, can increase the bandwidth availability ratio of transmitting transducer, improve signal-to-noise ratio and signal interference ratio, enhance and be
The anti-interference ability of system.
What paper currency sorting supersonic detection device provided by the invention and method were emitted simultaneously using positive and negative modulating signal of frequency modulation
Mode is applied to ultrasonic score-clearing system, solves the deficiency of signal power existing for existing apparatus and adjacency channel in the presence of dry
It disturbs and leads to the problem of detecting bank note low efficiency, paper currency detection efficiency is greatly improved, especially suitable for needing high speed detection
The scene of bank note.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is ultrasonic paper currency sorting system schematic；
Fig. 2 is the electronic system overall structure figure of ultrasonic paper currency sorting system；
Fig. 3 is transmitting/schematic side view of the reception Structure Attitude in cleaning-sorting machine；
Fig. 4 is single ultrasonic wave transmitting/receiving angle schematic diagram；
Fig. 5 is adjacency channel schematic diagram in ultrasonic paper currency sorting system；
Fig. 6 is paper currency sorting supersonic detection device structure chart provided in an embodiment of the present invention；
Fig. 7 is the transmitting signal waveform schematic diagram of single array element；
Fig. 8 is that the transmitting of single array element receives matching waveform diagram；
Fig. 9 is that adjacency channel emits signal waveform design diagram, wherein Fig. 9 (a), 9 (b) are respectively adjacency channel hair
The positive and negative modulating signal of frequency modulation Waveform Design schematic diagram penetrated；
Figure 10 is the time-frequency characteristics schematic diagram that adjacency channel emits signal；
Figure 11 is the time domain signal waveform schematic diagram that array element A and B emits simultaneously, wherein Figure 11 (a), 11 (b), 11 (c) point
Not Wei A channel in no bank note, have the time domain signal waveform schematic diagram of bank note and adhesive tape bank note；
Figure 12 is the time frequency signal schematic diagram that array element A and B emits simultaneously, wherein Figure 12 (a), 12 (b), 12 (c) are respectively
A channel in no bank note, have the time frequency signal schematic diagram of bank note and adhesive tape bank note；
Figure 13 is signal schematic representation after the processing that array element A and B emits simultaneously, wherein Figure 13 (a), 13 (b), 13 (c) are respectively
For A channel in no bank note, have signal schematic representation after the processing of bank note and adhesive tape bank note；
Figure 14 is paper currency sorting supersonic detection method flow chart provided in an embodiment of the present invention.
Specific embodiment
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical solution in the embodiment of the present invention are described, it is clear that described embodiment is only this
Invention a part of the embodiment, and not all embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Figure 14 is paper currency sorting supersonic detection method flow chart provided in an embodiment of the present invention, as shown in figure 14, the present invention
The paper currency sorting supersonic detection method of offer the following steps are included:
S1: calculating the positive and negative driving digital signal of the different in width on different channels, is driven using the digital signal
Drive module 2, and the positive or negative high voltage signal of different in width is obtained to drive multiple transmitting transducers 3 by drive module 2；
Wherein, the specific steps of positive and negative driving digital signal are calculated are as follows:
First, it is assumed that the reception energy converter band characteristics used are as follows: center frequency point fc, for the application, select frequency
Range is 100kHz to 500KHz.Find that the bandwidth for receiving energy converter is more efficient when signal-to-noise ratio is -40dB in the application,
Bandwidth is denoted as B, about 100KHz-200kHz, then Frequency point is respectively f up and downc- B/2 and fc+B/2.Use signal time length T
=40/fc, chirp rate K=B/T.
Positive and negative FM signal is calculated, calculation formula is as follows:
Wherein, s1(t) be positive modulating signal of frequency modulation, s2(t) be negative modulating signal of frequency modulation,For rectangular signal,
Then, binaryzation is carried out to positive and negative FM signal, obtains the positive and negative driving digital signal of different in width.
S2: the signal after 2 power amplification of drive module is converted into ultrasonic signal and is sent out by multiple transmitting transducers 3
It penetrates；
S3: wearing for the transmitting of transmitting transducer 3 is received by multiple reception energy converters 4 being arranged corresponding to transmitting transducer 3
The ultrasonic signal of saturating bank note, and it is converted into electric signal；
S4: the ultrasonic signal after receiving 4 to each channel reception energy converter, according to the bandwidth feature of transmitting transducer 3, to super
Acoustical signal is amplified and is improved to improve the signal-to-noise ratio of ultrasonic signal；
S5: after carrying out analog-to-digital conversion to the signal after amplification and conditioning, the signal is sent in main control module, is passed through
Main control module 1 carries out matched filtering operation using ultrasonic signal of the matched signal to each channel；
S6: to the signal after each channel matched filtering, detection is demodulated using absolute value or Hilbert transformation demodulation is wrapped
Network processing, and voltage decision process is carried out to the signal after each channel envelope processing, judge the state of bank note part.
Fig. 6 is paper currency sorting supersonic detection device structure chart provided in an embodiment of the present invention, as shown in fig. 6, the present invention mentions
The paper currency sorting supersonic detection device of confession includes:
One main control module 1, including a judgment module, connect with drive module 2 and matched filtering module 7, for controlling not
Signal transmitting and reception, matched filtering and channels operation state with channel；
Wherein, main control module 1 is a microprocessor, or other devices with the same function.Judgment module is adopted
Detection is demodulated with absolute value or Hilbert transformation demodulation carries out envelope processing, and the signal after each channel envelope processing is carried out
Voltage decision process judges the state of bank note part.
One drive module 2, connect with main control module 1, for driving multiple transmitting transducers 3；
Multiple transmitting transducers 3, connect with drive module 2, for carrying out to the signal after 2 power amplification of drive module
Conversion, and convert the signals to ultrasonic signal and emit；
Wherein, multiple transmitting transducers 3 are distributed in bank note according to the width direction or length direction laid out in parallel of bank note
Different zones.
Multiple reception energy converters 4 are accordingly set to multiple 3 sides of the transmitting transducer, it is changed for receiving multiple transmittings
The ultrasonic signal for penetrating bank note that energy device 3 emits, and ultrasonic signal is converted into electric signal；
Wherein, multiple reception energy converters 4 are distributed in bank note according to the width direction or length direction laid out in parallel of bank note
Different zones and with receive the quantity of energy converter 4 it is equal.
One amplification conditioning module 5, connect, for the received electricity of each channel reception energy converter 4 with multiple reception energy converters 4
Signal is amplified and is improved to improve the signal-to-noise ratio of ultrasonic signal；
One analog-to-digital conversion module 6 is converted to digital signal for will amplify the analog signal that conditioning module issues；
One matched filtering module 7 is connect with amplification conditioning module 5, for the digital signal after conversion to be sent to master control
In module 1, matched filtering operation is carried out by ultrasonic signal of the main control module 1 to each channel；
As shown in attached drawing 8 (b), for the single waveform diagram for receiving energy converter 4 after emitting and receiving matching treatment.
Single transmitting transducer 3 emits, and then corresponding receptions energy converter 4 receives, and use matched filtering to signal at
Reason.
Wherein, handled signal that the specific method is as follows using matched filtering module 7:
The single frequency response for receiving energy converter 4 of measurement；
2, according to the frequency of the frequency response of the reception energy converter 4 of measurement and Analog-digital Converter, inverting receives energy converter 4
Discrete impulse response；
Matched filtering module 7 is to emit the convolution of signal and discrete impulse response.
As shown in figure 9, emitting signal waveform design diagram for adjacency channel.First array element transmitting positive frequency modulation modulation letter
Number, second array element emits negative frequency modulation modulated signal, and successively backward, the 3rd array element uses positive frequency modulation modulated signal again.With 16 gusts
For member, including 8 positive frequency modulation modulated signals and 8 negative frequency modulation modulated signals.
By time frequency analysis, the temporal frequency of frequency modulation positively-modulated signal and negative frequency modulation modulated signal is observed.To obtain letter
Number feature.The two crosses one another on time frequency plane.
In order to clearly describe method used by the embodiment of the present invention, below using analog simulation data to its into
The mode of row detection, for proving the correctness and validity of the used method of the embodiment of the present invention.
Using the performance of the simulation computer sim- ulation embodiment of the present invention.Assuming that adjacency channel is A and B, corresponding 2 transmittings are changed
Energy device 3 is respectively A_T and B_T, and corresponding reception energy converter 4 is A_R and B_R.It is simple in order to calculate, it is assumed that B_T reaches A_R's
Signal is relative to B_R decaying -6dB.Assuming that decaying to -40dB by signal after paper.It declines through the ultrasonic signal for being stained with adhesive tape
Subtract -60dB.All hypothesis calculate simple all in order to approximate practical.
A array element and the transmitting of B array element are calculated first, and A channel receives the signal that energy converter 4 receives different conditions, is included in
There is no bank note, one banknote and adhesive tape bank note state.It as shown in Fig. 11, is the signal of three kinds of states.It can be seen from the figure that
It can not distinguished completely without bank note, but have bank note and there is adhesive tape but may change signal phase due to the change in location of bank note,
Lead to A, channel B signal fluctuation, discrimination substantially 6dB, if noise, the area of the signal in the case of two kinds is added in real system
It indexes smaller.
In order to which more clear view signal characteristic is as shown in figure 13 the time-frequency result of the signal in the case of three kinds.From figure
In as can be seen that in no bank note, signal is a positive frequency modulation modulation；There are bank note and adhesive tape situation, signal then compares
It is more complex, only bank note when, receive positive frequency modulation modulation in signal account for it is main, but in the case where having adhesive tape on bank note, then
Receive negative frequency modulation modulation in signal and account for main, signal is easy to be interfered by amplitude detection, using signal this feature into
Row is distinguished.
After time-frequency matching treatment, signal envelope, and the maximum value for the number of winning the confidence are taken in central point, so that it may obtain letter
Number testing result, according to Figure 13's as a result, bank note is not 10.2, bank note 0.1063, adhesive tape 0.016.Bank note and
Adhesive tape signal difference at least 5 times or more, about 14dB, relative to original 6dB, system rejection to disturbance ability is improved.
Paper currency sorting supersonic detection device provided by the invention and method are emitted simultaneously using positive and negative modulating signal of frequency modulation
Mode is applied to ultrasonic score-clearing system, solves the deficiency of signal power existing for existing apparatus and adjacency channel in the presence of dry
It disturbs and leads to the problem of detecting bank note low efficiency, paper currency detection efficiency is greatly improved, especially suitable for needing high speed currency
Detection scene.
Professional should further appreciate that, described in conjunction with the examples disclosed in the embodiments of the present disclosure
Unit and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, hard in order to clearly demonstrate
The interchangeability of part and software generally describes each exemplary composition and step according to function in the above description.
These functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.
Professional technician can use different methods to achieve the described function each specific application, but this realization
It should not be considered as beyond the scope of the present invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can be executed with hardware, processor
The combination of software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only memory
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (12)
1. a kind of paper currency sorting supersonic detection method, which comprises the following steps:
Positive and negative FM signal is calculated, using following calculation formula:
Wherein, fcIt is the center frequency point for receiving energy converter for carrier frequency, B, which is signal-to-noise ratio, receives the band of energy converter when being -40dB
Width, upper and lower Frequency point are respectively fc- B/2 and fc+ B/2, signal time length T=40/fc, chirp rate K=B/T, s1(t)
Be positive modulating signal of frequency modulation, s2(t) be negative modulating signal of frequency modulation,For rectangular signal,
Binaryzation is carried out to positive and negative FM signal, the positive and negative driving digital signal of different in width is obtained, passes through the digital signal
To drive drive module, and the positive or negative high voltage signal of different in width is obtained to drive multiple transmitting transducings by the drive module
Device；
Positive frequency modulation modulation and negative frequency modulation modulation is used alternatingly as transmitting signal in the transmitting transducer of adjacency channel；
Signal after the drive module power amplification is converted into ultrasonic signal and by multiple transmitting transducer hairs
It penetrates；
Multiple transmitting transducer hairs are received by multiple multiple reception energy converters being arranged corresponding to the transmitting transducer
That penetrates penetrates the ultrasonic signal of bank note, and ultrasonic signal is converted to electric signal；
To each channel it is multiple it is described receive energy converters receive after electric signal, according to it is described receive energy converter bandwidth feature,
Electric signal is amplified and is improved to improve the signal-to-noise ratio of electric signal；
After carrying out analog-to-digital conversion to the signal after amplification and conditioning, the signal is sent in main control module, the master is passed through
Module is controlled, matched filtering operation is carried out using digital signal of the matched signal to each channel；
Envelope processing is carried out to the signal after each channel matched filtering, and voltage is carried out to the signal after each channel envelope processing and is sentenced
It certainly handles, judges the state of bank note part.
2. paper currency sorting supersonic detection method according to claim 1, which is characterized in that described to each channel matched filtering
The method that signal afterwards carries out envelope processing is that detection or Hilbert transformation demodulation are demodulated using absolute value.
3. paper currency sorting supersonic detection method according to claim 1, which is characterized in that by the main control module to each
The specific steps that the ultrasonic signal in channel carries out matched filtering include: the single frequency response for receiving energy converter of measurement, according to survey
The frequency response of the reception energy converter of amount and the frequency of Analog-digital Converter, inverting receive energy converter discrete impulse response, matching
Filter module is the convolution for emitting signal and above-mentioned discrete impulse response.
4. a kind of paper currency sorting supersonic detection device is applied to paper currency sorting ultrasound as claimed in any one of claims 1-3
Detection method, which is characterized in that described device includes:
One main control module, including a judgment module, connect with drive module and Signal Matching filter module, different logical for controlling
The signal in road emits and reception, matched filtering and channels operation state；
One drive module, is connected to the main control module, for driving multiple transmitting transducers；
Multiple transmitting transducers are connect with the drive module, for the signal after the drive module power amplification into
Row conversion, and convert the signals to ultrasonic signal and emit；Wherein, positive tune is used alternatingly in the transmitting transducer of adjacency channel
Frequency modulation system and negative frequency modulation modulation are as transmitting signal；
Multiple reception energy converters are accordingly set to the side of multiple transmitting transducers, change for receiving multiple transmittings
The ultrasonic signal for penetrating bank note of energy device transmitting, and the ultrasonic signal is converted into electric signal；
One amplification conditioning module, connect, for each received telecommunications of channel reception energy converter with multiple reception energy converters
It number amplifies and improves to improve the signal-to-noise ratio of electric signal；
One analog-to-digital conversion module, the analog signal for issuing the amplification conditioning module are converted to digital signal；
One matched filtering module is connect with the amplification conditioning module, for the digital signal after conversion to be sent to the master
It controls in module, matched filtering operation is carried out by digital signal of the main control module to each channel.
5. paper currency sorting supersonic detection device according to claim 4, which is characterized in that multiple transmitting transducers are simultaneously
Column arrangement, is distributed in the different zones of bank note.
6. paper currency sorting supersonic detection device according to claim 4, which is characterized in that multiple transmitting transducers are pressed
According to the width direction distribution of bank note.
7. paper currency sorting supersonic detection device according to claim 4, which is characterized in that multiple transmitting transducers are pressed
According to the length direction distribution of bank note.
8. paper currency sorting supersonic detection device according to claim 4, which is characterized in that multiple reception energy converters are simultaneously
Column arrangement, is distributed in the different zones of bank note.
9. paper currency sorting supersonic detection device according to claim 4, which is characterized in that multiple reception energy converters are pressed
According to the width direction distribution of bank note.
10. paper currency sorting supersonic detection device according to claim 4, which is characterized in that multiple reception energy converters
It is distributed according to the length direction of bank note.
11. paper currency sorting supersonic detection device according to claim 4, which is characterized in that the transmitting transducer and institute
The quantity for stating reception energy converter is equal.
12. paper currency sorting supersonic detection device according to claim 4, which is characterized in that the main control module is one micro-
Processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710221185.2A CN107146320B (en) | 2017-04-06 | 2017-04-06 | A kind of paper currency sorting supersonic detection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710221185.2A CN107146320B (en) | 2017-04-06 | 2017-04-06 | A kind of paper currency sorting supersonic detection device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107146320A CN107146320A (en) | 2017-09-08 |
| CN107146320B true CN107146320B (en) | 2019-11-08 |
Family
ID=59773720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710221185.2A Active CN107146320B (en) | 2017-04-06 | 2017-04-06 | A kind of paper currency sorting supersonic detection device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107146320B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4812114B2 (en) * | 2007-02-23 | 2011-11-09 | オムロン株式会社 | Paper sheet multi-feed detection device and paper multi-feed detection method |
| JP2012008054A (en) * | 2010-06-25 | 2012-01-12 | Toshiba Corp | Ultrasonic line sensor and paper sheet processor having ultrasonic line sensor |
| US20130197365A1 (en) * | 2012-01-31 | 2013-08-01 | Toshiba Medical Systems Corporation | Ultrasonic diagnostic apparatus and ultrasonic diagnostic apparatus control method |
| CN203535713U (en) * | 2013-10-09 | 2014-04-09 | 辽宁聚龙金融设备股份有限公司 | Device for ultrasonic detection of tapes and overlapping in banknote processing |
| CN204945100U (en) * | 2015-07-31 | 2016-01-06 | 西安邮电大学 | A kind of ultrasonic transmission device of frequency-adjustable |
| CN105046805B (en) * | 2015-08-07 | 2017-12-01 | 新达通科技股份有限公司 | A kind of paper money thickness testing apparatus and its calibration method |
-
2017
- 2017-04-06 CN CN201710221185.2A patent/CN107146320B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107146320A (en) | 2017-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20210033724A1 (en) | Multi-target life detection method based on radar signal and detection radar | |
| Hancke | Practical eavesdropping and skimming attacks on high-frequency RFID tokens | |
| CN105866742A (en) | Shell explosion point positioning system and positioning method | |
| CN101169390A (en) | Engineering structure damage active monitoring lamb wave time-reversal focusing method | |
| CN104382618B (en) | The denoising method and Fetal Heart Rate detector detected based on Fetal Heart Rate | |
| CN102135619A (en) | Biosonar sounding device and method | |
| CN203535713U (en) | Device for ultrasonic detection of tapes and overlapping in banknote processing | |
| CN106290549A (en) | Magnetosonic multiparameter lossless detection method and device | |
| EP0233676A1 (en) | Apparatus for ultrasound detection | |
| CN107072569A (en) | Spike detection module based on frame | |
| CN112781447A (en) | Land mine detection device based on UWB pulse electromagnetic wave | |
| CN108577837A (en) | A kind of portable tumor detection devices and detection method based on the sources UWB | |
| CN104714237A (en) | Fish identification method with multi-feature and multidirectional data fused | |
| CN105675126B (en) | A kind of new method for stablizing sound field acoustic pressure for detecting multifrequency multi-source complexity | |
| CN107146320B (en) | A kind of paper currency sorting supersonic detection device and method | |
| CN107064944A (en) | High speed multibeam sounding system and its depth detecting method based on Frequency Hopping Signal | |
| Avanesians et al. | Wave separation: Application for arrival time detection in ultrasonic signals | |
| CN105572232B (en) | The amplification method and device of low frequency electromagnetic supersonic guide-wave reception signal | |
| CN206627111U (en) | High speed multibeam sounding system based on Frequency Hopping Signal | |
| CN116115186B (en) | Method and system for detecting biological tissue components | |
| CN107765085A (en) | A kind of signal supervisory instrument and method | |
| CN116840821A (en) | Double-frequency sounding control system based on data analysis | |
| CN203204173U (en) | Underground mine three-component transient electromagnetic instrument | |
| CN215114225U (en) | Land mine detection system based on UWB pulse electromagnetic wave | |
| CN104574633A (en) | Ultrasonic detection device and method for adhesive tapes and overlapped paper currency in paper currency treatment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |