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Metal detection device

A metal detection and metal technology, which is used in measuring devices, geophysical measurements, radio wave measurement systems, etc., can solve problems such as inability to tune, achieve efficient inspection, and improve detection sensitivity.

Inactive Publication Date: 2007-05-09
ANRITSU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The problem of the above-mentioned Patent Document 2 is that since one transmitting coil is driven by two frequencies with a large frequency difference, tuning (resonance) cannot be performed.
If the capacitor is switched by a switch or the like at each frequency, it is possible to tune at each frequency, however, it will fall into the same problem as Patent Document 1

Method used

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Embodiment 1

[0059] FIG. 2( a ) is a schematic diagram of the electrical structure of an example of the magnetic field generating unit 2 of this embodiment. FIG. 2(b) shows the main functions and actions of each constituent element. The tuning element in Fig. 2(b) and the connection elements that contribute to the tuning function are the main components of the tuning function part, and the isolation element is the main part of the isolation function part (hereinafter, Fig. 3(b), Fig. 3(c), The same applies to Fig. 4(b) and Fig. 5(b)).

[0060] In FIG. 2( a ), the signal generating unit 1 inputs a signal (F1<F2) including frequency components F1 and F2 to the magnetic field generating unit 2 through the coils T1c and T1b of the transformer T1. The dotted line portion in Fig. 2(a) indicates the connection portion 2a. In FIG. 2( a ), values ​​are set such that the coil L2 and the capacitor C3 resonate in parallel at the frequency F2, and the coil L3 and the capacitor C4 resonate in parallel...

Embodiment 2

[0064] FIG. 3( a ) is a schematic diagram of the electrical structure of another embodiment of the magnetic field generating unit 2 .

[0065] Fig. 3 (b) shows that the frequency of the signal of the frequency F1 component output by the signal generation unit 1a in Fig. 3 (a) is lower than the frequency of the signal of the frequency F2 component output by the signal generation unit 1b (F1F2), each structure The main functions and functions of components. In FIG. 3( a ), the signal generators 1 a and 1 b input the signal of the frequency F1 component and the signal of the frequency F2 component to the magnetic field generator 2 via transformers T2 and T3 , respectively.

[0066] Below, according to Fig. 3(a) and Fig. 3(b), the situation (F1

Embodiment 3

[0070] FIG. 4( a ) is a schematic diagram of the electrical structure of another embodiment of the magnetic field generating unit 2 . FIG. 4(b) shows the main functions and actions of each constituent element. In Fig. 4, the signal generating units 1a and 1b input the signal of the frequency F1 component and the signal of the frequency F2 component (F1<F2 in this example) to the magnetic field generating unit 2 through the capacitor C1 and the transformer T2, the capacitor C2 and the transformer T3 respectively. . Among them, the impedance of the signal generation unit 1a viewed from the capacitor C1 and the impedance of the signal generation unit 1b viewed from the capacitor C2 are low at least at their respective frequencies.

[0071] In FIG. 4, in the frequency F1 region, the transmitting coil L1 is tuned so as to be connected to the capacitor C1 via the coil L8 and the transformer T4 (at this time, L1+L8 and C1 resonate), thereby constituting the F1 tuning function part 2...

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Abstract

There is provided a metal detection device capable of effectively detecting a metal mixed in food or the like by generating AC magnetic field simultaneously tuned to respective frequencies by a single transmission coil in response to frequency components of different frequencies without switching an element by a switch or the like. Constituent elements constituting magnetic field generation means (2) are connected so that a transmission coil L1 and a capacitor C1 resonate in the first frequency F1. Moreover, constituent elements are connected so that the transmission coil L1 and a capacitor C2 resonate in the second frequency F2. Furthermore, constituent elements function so as to effectively separate the capacitor C1 and capacitor C2 so that they do not interfere at least in the same frequency.

Description

technical field [0001] The present invention relates to a metal detection device that provides an AC magnetic field to an object to be inspected, and detects whether or not metal, which is a foreign matter, is mixed into the object to be inspected based on changes in the magnetic field. When a magnetic field of a predetermined frequency is applied to an object to be inspected, such as food, a change in the magnetic field caused by metal mixed in the food can be detected. In the metal detection device for judging the presence or absence of magnetic metal and non-magnetic metal, it is necessary to consider the response characteristics to the magnetic field of the metal to be detected, the packaging material of the food, the food itself, etc., and provide appropriate multiple frequencies for the food. magnetic field. Among the above-mentioned metal detection devices, the present invention particularly relates to a technique for simultaneously and efficiently generating a magneti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/11G01V3/10
CPCG01V3/104
Inventor 西尾裕幸长冈纪彦久保寺茂
Owner ANRITSU CORP
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