Multi-frequency detection type metal detection circuit and device
A metal detection and circuit technology, which is applied in the direction of measuring devices, acoustic reradiation, electric/magnetic exploration, etc., can solve the problems of low upper limit of detection accuracy and low upper limit of detection speed, so as to improve accuracy and reduce interference , the effect of improving the detection efficiency
Pending Publication Date: 2020-09-25
TECHIK INSTR SHANGHAI
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Problems solved by technology
[0003] In the existing technology, in order to improve the detection efficiency and test accuracy to suppress the product effect, the method adopted is a multi-frequency synchronous demodulation circuit to make the high and low frequency signals work at the same time. This method only needs to install a set of coils, so the installation is relatively easy, and The size can be kept small, but there are still some defects in the existing technology. For example, in the case of time division multiplexing, the upper limit of the detection speed is not high, and if the dual-path filter detection method is used, the upper limit of the detection accuracy is not high. question
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Embodiment Construction
[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
[0036] A metal detection circuit for multi-frequency detection, such as figure 1 As shown, the metal detection circuit is applied to a metal detection device, including a transmitting circuit 1, a receiving circuit 2 and a controller 3, the controller 3 is connected to the transmitting circuit 1 and the receiving circuit 2 respectively, and the transmitting circuit 1 is a dual-frequency transmitting circuit 1, The receiving circuit 2 includes:
[0037] The receiving coil group is provided with at least two groups, and the two receiving coils of each group of receiving coil group are ...
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The invention relates to a multi-frequency detection type metal detection circuit and device. The detection circuit comprises a transmitting circuit, a receiving circuit and a controller. The controller is respectively connected with the transmitting circuit and the receiving circuit; the transmitting circuit is a double-frequency transmitting circuit; the receiving circuit comprises at least tworeceiving coil groups and a plurality of receiving demodulation circuits; two receiving coils of each receiving coil group are symmetrically arranged on two sides of a transmitting coil; and the number of the receiving demodulation circuits is consistent with the number of the receiving coil groups, each receiving demodulation circuit is connected with the corresponding receiving coil group, and each receiving demodulation circuit outputs signals with different frequencies. Compared with the prior art, the multi-frequency metal detector has the advantages that the receiving coil groups and thecorresponding receiving demodulation circuits are arranged in the multi-frequency metal detector, so that different frequencies are received by the different receiving coil groups and the receiving demodulation circuits, so that the interference is reduced, signal accuracy is improved, and detection efficiency is improved on the premise that the signal accuracy is guaranteed.
Description
technical field [0001] The invention relates to the field of metal detection, in particular to a metal detection circuit and device for multi-frequency detection. Background technique [0002] As we all know, in the field of metal detection, high-frequency carrier signal is beneficial to the detection of metal interference, but it is not conducive to the suppression of product effect when the product effect is large. At this time, a lower frequency signal is generally selected. [0003] In the existing technology, in order to improve the detection efficiency and test accuracy to suppress the product effect, the method adopted is a multi-frequency synchronous demodulation circuit to make the high and low frequency signals work at the same time. This method only needs to install a set of coils, so the installation is relatively easy, and The size can be kept small, but there are still some defects in the existing technology. For example, in the case of time division multiplexi...
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IPC IPC(8): G01V3/11
CPCG01V3/10
Inventor 殷星牟翔
Owner TECHIK INSTR SHANGHAI
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