Method and device for real-time detection of note thickness

Abstract

The invention provides a method and a device for real-time detection of note thickness. The method comprises that: a microwave generator generates and sends microwave pulse signals into magnetic field exciting coils to obtain a high frequency alternating magnetic field; driven upper rollers are positioned in the magnetic field; notes pass between the upper rollers and lower rollers; the upper rollers float; detection sensors detect magnetic signals reflected by the upper rollers; the magnetic signals are converted into electrical signals which are processed through a circuit and then sent into a microprocessor; a thickness value of the notes is obtained in real time through the corresponding relation between the changes of resonance frequency and the thickness of the notes; the value is sent to a display to be displayed; and an alarm is given when the thickness exceeds a set value. The detection sensors formed by inlaying the magnetic field exciting coils and detection coils are right above every upper roller, and are connected to the microprocessor through frequency-dividing phase-locking circuits and shaping circuits respectively. Data of the relation between the thickness of the notes and the value of microwave pulse frequency, as well as processing programs is stored in the microprocessor, and the microprocessor is connected with the display and an alarm. The method and the device have the advantage of automatically identifying various note defects, along with detection convenience, rapidness and accuracy.

Description

(1) Technical field [0001] The invention relates to the technical field of paper detection, in particular to a method and device for real-time detection of banknote thickness. (2) Technical background [0002] For paper, especially banknotes, it is necessary to accurately measure the thickness, overlap, missing corners, damage, etc. of banknotes. At present, there are many detection methods and related equipment for banknotes. Among them, the non-contact detection equipment mainly uses Hall sensors, or ultraviolet and infrared sensors, or lasers, CCD image sensors, or strain gauge sensors, or ultrasonic waves. For example, the patent No. 200710177538.X Zhongchao Great Wall Financial Equipment Holdings Co., Ltd.'s invention patent "Banknote Thickness Detection Device" uses the magnetic steel on the transmission arm and the corresponding Hall sensor to obtain high-precision banknote thickness detection results. The application number is 200620093037.4 Shenyang Zhongchao Xinda...

AI Technical Summary

Problems solved by technology

[0003] At present, the biggest disadvantage of the above methods of detecting banknotes and various types of equipment is that the response is slow, and it is difficult to be used in conjunction with high-speed coin making machines, sorting machines, banknote counting machines, etc.

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