2 results about "Transmitter coil" patented technology

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.