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Coin authenticity intelligent detection device and detection method based on pulse excitation

A technology of intelligent detection and pulse excitation, which is applied in the direction of coin inspection, handling coins or valuable banknotes, instruments, etc., can solve the problems of high price, low recognition accuracy, increased difficulty of coin identification and screening, etc., to improve detection speed, The effect of preventing missed detection and improving the false detection rate and discrimination

Inactive Publication Date: 2017-02-08
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the increasing level of various counterfeiting technologies and the variety of coins, these make it more difficult to identify and screen coins.
The identification accuracy of the existing coin identification devices based on eddy currents is generally low, and some counterfeit coins newly produced in the society cannot be identified in time. At the same time, the coin identification devices of large foreign companies are extremely expensive, so it is necessary to develop high-precision counterfeit devices. A multi-currency intelligent counterfeiting device that is easy to expand

Method used

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  • Coin authenticity intelligent detection device and detection method based on pulse excitation
  • Coin authenticity intelligent detection device and detection method based on pulse excitation
  • Coin authenticity intelligent detection device and detection method based on pulse excitation

Examples

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Embodiment 1

[0046] This embodiment describes a coin authenticity intelligent detection device based on pulse excitation, its overall structure is as follows figure 1 As shown, the principle block diagram is as figure 2 As shown, the coin authenticity intelligent detection device is located at the front end of the coin terminal equipment 1, and the intelligent detection device includes a coin path 7, a multi-frequency eddy current sensor, an excitation circuit 9, a detection circuit 3 and a DSP processing module 2;

[0047] Multi-frequency eddy-current sensors are arranged along coin path 7 both sides, according to coin 6 patterns to be detected, to be detected

[0048] The material of the coin 6 and the change of the thickness of the coin 6 to be detected generate different eddy current signals;

[0049] The excitation circuit 9 is connected with the DSP processing module 2, and the input signal of the excitation circuit 9 is from the DSP

[0050] The TTL control signal output by the p...

Embodiment 2

[0070] The present invention also provides a coin authenticity detection method, which uses the above-mentioned smart coin authenticity detection device based on pulse excitation, and the method continuously collects the output voltage U of the Hall sensor h and compare, when U h When >3V, the voltage signal of the multi-frequency eddy current sensor will be collected after a delay of 5ms, and every 128 sampling data will be regarded as a data set S i ,(i=1,2,…) and find the signal peak value U i ,(i=1,2,…), when U i >U i+1 >U i+2 and U i When <δ, start the feature quantity extraction process;

[0071] For the extraction process of each feature quantity of the reflective eddy current sensor and the transmissive eddy current sensor in the multi-frequency eddy current sensor, the specific steps are:

[0072] 4) Take 128 sampling data as a group, and collect 10 groups of data S sequentially i+2+j ,(j=0,1,…,9) for feature extraction, respectively find S i+2+j The maximum v...

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Abstract

The invention discloses an intelligent coin authenticity detection device based on pulsed excitation and a detection method of the device. The intelligent coin authenticity detection device comprises a Hall sensor, two eddy current sensors, a detection circuit, an excitation circuit, a DSP (digital signal processor) module and the like and can be used for the fields such as bank distribution, public transportation and retail industry. The intelligent coin authenticity detection device can generate different induced voltage signals according to change of materials, thicknesses and patterns of coins, excitation signals are multi-frequency pulse signals, and frequencies of the excitation signals are changed by the aid of software programming. When the coins come, firstly, a starting point is judged by the aid of the Hall sensor; secondly, two eddy current voltage transmission signals are acquired, filtered and amplified; thirdly, the two eddy current voltage transmission signals are transmitted to a DSP for extracting multi-frequency characteristic quantity and characteristics of time domains and performing the authenticity identifying process; finally, detection results are transmitted to a controller of a terminal device by the aid of a communication port to perform alarm display and removing control. The intelligent coin authenticity detection device has the advantages that authenticity identification rate is high, new coin authenticity identification functions are conveniently expanded and the like.

Description

technical field [0001] The invention relates to coin detection technology, in particular to an intelligent coin authenticity detection device and detection method based on pulse excitation. Background technique [0002] Since coins are widely used in public transportation, retail and other fields, it is of great significance to identify counterfeit coins. Although the circulation life of coins is much longer than that of banknotes, they also need to be returned to the basket on a regular basis. The coins that are too worn out, the coins out of circulation, and the counterfeit coins need to be sorted and packaged to return them to the circulation channel. Therefore, all banking institutions Need to face the 100 billion scale coin circulation market. In addition, because various counterfeiting techniques are getting higher and higher at present, and there are many types of coins, these all make it more difficult to identify and screen coins. The identification accuracy of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G07D5/08
Inventor 曹建福张家良杨耀旺
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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