Instrument for measuring coin conductivity

A technology of conductivity and measuring instruments, which is applied in the field of conductivity measuring instruments and conductivity measuring instruments, can solve the problems of lossy measurement and slow test speed, and achieve the effect of reducing the influence of external factors

Active Publication Date: 2010-06-16
CHINA BANKNOTE PRINTING & MINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the whole test process is an electrochemical reaction process, so the test speed is relatively slow
Also, a chemical reaction between coins of certain materials and the couplant tends to occur, making these measurements fall into the category of destructive measurements

Method used

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  • Instrument for measuring coin conductivity
  • Instrument for measuring coin conductivity
  • Instrument for measuring coin conductivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Generally, the principle of eddy current testing can be used figure 1 and figure 2 Indicates that the coin is always placed in or close to the detection coil. The coil generates an alternating magnetic field Hp, under the action of Hp, an eddy current is induced in the coin, and the eddy current generates a secondary magnetic field HS, which interacts with the magnetic field Hp, causing the original magnetic field to change, making the coil inside The magnetic flux changes, which changes the impedance of the coil. The geometric size, electrical conductivity, magnetic permeability, pattern structure, etc. of the coin will change the density and distribution of the eddy current, thereby changing the impedance of the coil. The impedance of the detection coil can be expressed by complex impedance, namely: Z=R+jX

[0024] When a coin approaches the coil, the complex impedance of the coil changes due to the eddy currents in the coin. Wherein, the change of the real part ...

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PUM

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Abstract

The invention relates to a conductance survey meter, which belongs to the technical field of measurement and identification facilities for coin and articles to the coin. A reference signal is led outbetween a signal source and an AC constant current source, and is input into the input terminal for reference signal of a phase sensitive circuit through a phase shift circuit; a detection signal is extracted from the detection circuit and is input to an input terminal for detection signal of the phase sensitive circuit through an amplifying circuit; an output terminal of the phase sensitive circuit is connected with the signal input terminal of a CPU chip; an output terminal for detection result of the CPU chip is connected with a display circuit for outputting and displaying the detected conductivity obtained through operation. Compared with the prior art, the conductance survey meter has the advantages that no additional magnetic material is needed in and around the detecting coil; furthermore, as a comparison method is adopted for a shadow coin discriminator, and an absolute measuring method is adopted in the conductance survey meter, effects from external factors can be reduced tothe lowest level.

Description

technical field [0001] The invention relates to a conductivity measuring instrument, in particular to a batch of conductivity measuring instruments that can be used for coin selection by a coin validator, and belongs to the technical field of coin and similar measurement and identification facilities. Background technique [0002] Coin conductivity reflects the electrical characteristics of coins, and is one of the important characteristics that determine the comprehensive appearance of coins in automatic identification systems. Therefore, the measurement and on-line detection of coin conductivity are of great significance. In order to make the comprehensive appearance of coins of the same currency value consistent in the automatic identification system, first of all, it should be ensured that the conductivity error of the coins is within the set allowable range. However, the coin is a special product, its resistance value is very small, and the surface is printed with patt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G07D5/08G01R27/02
Inventor 邵继南张武军檀世明徐丽新夏凌云陆海戴亮
Owner CHINA BANKNOTE PRINTING & MINTING
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