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Photoelectric detection device and method for identifying scotch tape on banknotes based on laser reflection

A technology of photoelectric detection and scotch tape, which is applied in the field of banknote detection and research, can solve the problems of unalterable coinage and sorting, and achieve the effects of fast speed, accurate and sensitive detection results, and high scanning speed

Active Publication Date: 2018-04-17
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the adhesive tape on the market is very thin, and the production method of banknotes determines that the thickness of the real banknotes is not strictly consistent, conventional banknote detection equipment cannot distinguish banknotes with adhesive tape from counterfeit coins by detecting the thickness.

Method used

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  • Photoelectric detection device and method for identifying scotch tape on banknotes based on laser reflection
  • Photoelectric detection device and method for identifying scotch tape on banknotes based on laser reflection
  • Photoelectric detection device and method for identifying scotch tape on banknotes based on laser reflection

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Experimental program
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Effect test

Embodiment 1

[0029] When the light hits the surface of the object, diffuse reflection and specular reflection will occur. Relatively rough paper and relatively smooth tape have different reflectivity to light. In theory, after the tape is pasted on the banknote, the scattering performance is weakened and the reflection performance is enhanced. Most of the light is reflected in an approximate specular reflection. When there is no adhesive tape on the banknote, the scattering performance is stronger, and the light is mainly reflected in various directions in a diffuse reflection manner. The laser sensor is placed somewhere in the reflected light path to detect the laser intensity after the banknote is reflected. When the banknote is pasted with adhesive tape, an approximate specular reflection will occur. At this time, the measured light intensity is relatively large. On the contrary, due to the main occurrence of diffuse reflection, The measured light intensity is small. Based on this prin...

Embodiment 2

[0041] Present embodiment except following features other structures are with embodiment 1: see image 3 , the present embodiment is based on laser reflection to identify the photoelectric detection device of the scotch tape on the banknote, including a first plane mirror 10, a second plane mirror 11, and a third plane mirror 12. The reflected light of the banknote to be detected (especially for the tape-attached portion) is reflected by the first plane mirror 10, the second plane mirror 11, and the third plane mirror 12 in sequence, and then irradiates on the laser sensor array.

[0042] The reason why multiple plane mirrors are used for reflection is to increase the length of the optical path in a limited space, increase the contrast, and then improve the accuracy of recognition.

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Abstract

The invention discloses a photoelectric detection device and method for identifying scotch tape on banknotes based on laser reflection. Drive circuit, several plane mirrors, laser sensor array, signal processing circuit; the laser emitted by the laser tube array is irradiated on the banknote to be detected through the opening, and the reflected light of the banknote to be detected is irradiated on the laser sensor array after being reflected by several plane mirrors; The signal processing circuit is respectively connected with the laser tube drive circuit and the laser sensor array, and is used to send a control signal to the laser tube drive circuit, convert the laser sensor array signal into a corresponding logic signal, and judge the banknote currently to be detected according to the logic signal. Whether transparent tape is pasted. The invention can detect banknotes stuck with scotch tape, and has the advantages of small size, high efficiency, fast speed and strong resolution ability.

Description

technical field [0001] The invention relates to the field of banknote detection research, in particular to a photoelectric detection device and method for identifying scotch tape on banknotes based on laser reflection. Background technique [0002] As a medium of exchange, banknotes are widely circulated in all aspects of social life. In the process of circulation, banknotes will inevitably be worn out and become damaged or old coins. In daily life, people often use adhesive tape to process the damaged currency and continue to use it. However, the current equipment such as ordinary banknote detectors and ATM machines cannot accurately identify such banknotes, and even cause equipment damage when identifying such banknotes. [0003] In particular, in recent years, criminals have divided a genuine banknote into two, and pasted half of the real banknotes and half of the fake banknotes together with adhesive tape to make counterfeit coins. Or cut out the part with the anti-cou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G07D7/128
Inventor 贾寒光张渊周斌王仁占刘柳向拓闻
Owner SOUTH CHINA NORMAL UNIVERSITY
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