Automatic balance information processing method and device of metallic foreign body detecting machine

Abstract

The invention relates to an automatic balance information processing method and device of a metallic foreign body detecting machine. The method comprises the following steps that: 1) after startup, collecting received phase phi information of a receiving circuit and the amplitude A of an initial receiving signal obtained by the receiving circuit in real time through an A / D (Analog to Digital) sampling circuit, and automatically detecting the balance state of the initial receiving signal; 2) judging whether the balance state meets a set value or not; if yes, not generating a balance signal; and if not, executing a step 3) and the like. The device comprises the receiving circuit, a filtering circuit, the A / D sampling circuit, a real-time phase calculation module, a balance signal generating module, a FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor), a MCU (Microprogrammed Control Unit), an automatic balance controller, a D / A (Digital to Analog) conversion module and an emission circuit. Compared with the prior art, the method and the device have the advantages that the sensitivity and the stability of the metal detecting machine are increased and the like.

Description

technical field [0001] The invention relates to a key technology of a metal foreign object detection machine, in particular to an automatic balance information processing method and device in a metal foreign object detection machine. Background technique [0002] Balanced metal detectors are subject to stress deformation and temperature changes, which lead to changes in the static equilibrium state, resulting in reduced sensitivity, or even complete loss of detection capabilities. Therefore, automatic balancing technology has become the key technology of this type of metal detector. [0003] At present, the mainstream automatic balancing technology scheme is as the US patent. Patent No. 5,691,640 Title: "Forced Balance Metal Detector", "Automatic Balance Metal Detector". The metal detector adopts balance detection to obtain the compensation value, and then outputs two DC voltages through two digital-to-analog converters (D / A). The output DC voltage and the orthogonal sine ...

AI Technical Summary

Problems solved by technology

[0004] This type of scheme uses more analog circuits, resulting in complex circuits and difficulties in debugging, as well as problems such as reduced stability due to problems in the circuit itself.

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