Two-dimension positioning method used for metal detector detecting metal exogenous impurity

Abstract

The method features the following: after overall tested object passes through the probe, the data will be collected; deciding which channel is abnormal, and how many abnormities happens in one channel; displaying those abnormities on the LCD. The method comprises: a) running; 2) when there is a object blocks off the infrared detector, starting the A / D data collection; 3) after the object gets away from the infrared detector, stopping the collection of A / D data, and analyzing the collected data; 4) according to the collected data, calculating the length of the object and the location of each abnormal point; 5) display the abnormal points on the LCD.

Description

Technical field: [0001] The invention relates to a two-dimensional positioning method, in particular to a two-dimensional positioning method applied to metal foreign objects in metal detectors. Background technique: [0002] Metal detectors can be roughly divided into beat type, self-excited induction type, energy consumption type (power absorption type) and balanced type according to the basic principle and detection circuit. Using the balanced type can get relatively high sensitivity, and can detect metal particles below 1mm. Metal detectors currently on the market are basically implemented with analog circuits. The advantage of using an analog circuit is that the circuit is simple and easy to implement. The disadvantage is that the analog system has poor anti-interference and stability. It is difficult to adjust parameters. The use of digital technology can overcome the problems of analog circuits. There are two digital technology solutions for metal detectors: one i...

AI Technical Summary

Problems solved by technology

[0003] When the current metal detector detects metal, once a certain channel detects metal, it will immediately give an alarm prompt; although such a detection method can detect metal foreign objects in time, it cannot specify the specific orientation or position of the metal foreign objects. Personnel re-examine the tested items to find out the metal foreign objects; in addition, since the number of metal foreign objects is not known, after each metal foreign object is found, the metal detector must be used to detect it again. , and so on, until the metal detector does not alarm

[0004] This method is obviously very complicated and cumbersome, and the burden on the inspectors is relatively heavy. Therefore, a new method for locating metal foreign objects in metal detectors is particularly needed

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