Automatic phase tracking information processing method and device for use in metal foreign matter detector

Abstract

The invention relates to an automatic phase tracking information processing method and a device for use in a metal foreign matter detector. The method comprises the following steps that: (1) after phase setting is completed, a real-time phase computing module takes a receiving phase phi0 transmitted by an A / D (Analog to Digital) sampling circuit as an initial value; and (2) a receiving circuit judges whether a product passes, if not, a step (3) is carried out, and otherwise, the receiving phase is not collected, and the like. The device comprises the receiving circuit, a filtering circuit, the A / D sampling circuit, the real-time phase computing module, an FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor), an MCU (Microprogrammed Control Unit), a phase tracking controller, a D / A conversion module and a transmitting circuit. Compared with the prior art, the method and the device have the advantages of improvements on the phase resolution and detection instantaneity, and the like.

Description

technical field [0001] The invention relates to a metal foreign object detection machine, in particular to an automatic phase tracking information processing method and device in the metal foreign object detection machine. Background technique [0002] The early metal detectors were mainly realized by analog circuits. Due to their many shortcomings (for example: low detection sensitivity, poor stability, relatively large interference from the outside world, and relatively fixed detection product objects), metal detectors currently on the market Most detectors adopt digital technology solutions, which can be generally divided into two types: one is basically using analog circuit structure, but in the output part, the output value is sent to the microprocessor for judgment through the A / D converter, and at the same time, human Machine dialogue function. The other uses a direct digital synthesis method to generate a modulated sine wave, which can control the phase of the sine ...

AI Technical Summary

Problems solved by technology

[0002] The early metal detectors were mainly realized by analog circuits. Due to their many shortcomings (for example: low detection sensitivity, poor stability, relatively large interference from the outside world, and relatively fixed detection product objects), metal detectors currently on the market Most detectors adopt digital technology solutions, which can be generally divided into two types: one is basically using analog circuit structure, but in the output part, the output value is sent to the microprocessor for judgment through the A / D converter, and at the same time, human Machine dialogue function

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