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Metal detector adjusting device

A metal detector and detection circuit technology, applied in the field of metal detectors, can solve problems such as failure to work normally, unfavorable mass production of production lines, etc., and achieve the effect of reducing production difficulty and improving production efficiency

Active Publication Date: 2015-04-01
广东恩威视科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the production line, it is difficult to meet this requirement, and when more than two metal detectors are working, they will be interfered by the electromagnetic fields generated by each other, resulting in failure to work normally, which is not conducive to the mass production of the production line

Method used

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Embodiment Construction

[0027] Please refer to Figure 1 to Figure 4 As shown, it shows the specific structure of the preferred embodiment of the present invention, including MCU 10, display control circuit 20, DAC control circuit 30, first DDS control circuit 40, second DDS control circuit 50, first low Pass filter circuit 60 , second low pass filter circuit 70 , first amplifying circuit 80 and second amplifying circuit 90 .

[0028] The display control circuit 20 selects the frequency of the analog signal through button control to simulate the type and depth of the metal. The detection frequency of the VLF type metal detector is relatively low, generally between 5K and 25.5K. The frequency adjustable range of the device is 5K~30K, the adjustment scale is 0.1K. MCU 10 internally stores data related to simulated metal signals of several coins such as NICKEL, ZINC, DIME, and QUARTER. These data are obtained through a large number of experiments and can highly simulate their response signals in the de...

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Abstract

The invention discloses a metal detector adjusting device, comprising an MCU (microprogrammed control unit), a display control circuit, a DAC (digital-to-analog converter) control circuit, a first DDS (digital display scope) control circuit, a second DDS control circuit, a first low-pass filter circuit, a second low-pass filter circuit, a first amplifying circuit and a second amplifying circuit. Through cooperative utilization of various circuits, response signals of a few of common metals in the metal detector are simulated by virtue of a signal generator through digital synthesis; in the production process of the metal detector, the signals generated by the metal detector adjusting device are directly input into a detection circuit of the metal detector, so that debugging and adjusting can be carried out; debugging does not need to be carried out by connecting a detection coil and generating a real physical signal through the detection coil, thus the metal detector adjusting device gets rid of limit of environmental electromagnetic interference; the production difficulty is lowered; the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technology in the field of metal detectors, in particular to a metal detector calibration device. Background technique [0002] Metal detection technology mainly uses the principle of electromagnetic induction. Currently, the most widely used is the VLF continuous sine wave technology. A low-frequency continuous sine wave drives the transmitting coil to generate an alternating electromagnetic field. When metal is detected, the receiving coil will receive To a sine wave of the same frequency whose amplitude and phase shift are changed by the eddy current induction of the metal. Metal detectors distinguish the type of metal by analyzing the amplitude and phase shift of the signal. [0003] In order to ensure the accuracy of the metal discrimination ability of metal detector products, the key parameters of the detection circuit of the product are required to be basically the same. However, due to the influence of electronic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V13/00G01V3/10
Inventor 范振粤向志文吴跃程徐培彬杨晓东杜明辉袁仁坤范立斌罗斌劳景南吴土乾杜绪明杨运勋
Owner 广东恩威视科技有限公司