Analysis of the causes of false alarms of metal detectors and countermeasures
1. Check whether there is interference in the power line. If there is a large noise, please use a power isolation transformer to supply power to the metal detector. 2. Check whether there is a working frequency conversion device near the metal detector. The frequency conversion device will cause great interference to the metal detector. Please move the metal detector away from the frequency conversion device. 3. Check whether there is a strong magnetic field or large metal blocks around the metal detector. Strong magnetic fields and large metal blocks will change the magnetic field around the metal detector and cause false alarms. 4. Check whether the sensitivity and phase are in the initial position. If the sensitivity is too high or the phase changes, the product effect will increase, resulting in false alarms. Please re-adjust the product signal suppression. The detected non-metallic materials generally have a certain product effect, and the size of the product effect directly affects the working performance of the metal detector. The digital metal detector side uses the ability of digital signal processing to compensate the product effect to a certain extent, which can reduce the impact of the product effect on the metal detector in the working process. The detection performance of the metal detector can be increased. General manufacturers often solve this problem from three aspects. 1. Using the understanding of the characteristics of the product effect, the intelligent identification method is used to distinguish the difference between the metal and the product effect, and the working performance of the metal detector can be improved; generally, it can achieve good detection performance, but the detection of aluminum foil packaging products requires special custom made. 2. The performance of the detector is improved by using different product effects to the different operating frequencies of the detector, but the problem is that this method will reduce the sensitivity to non-ferromagnetic metals, and often improve the performance of ferromagnetic metals. performance but reduced the sensitivity of stainless steel. 3. Use two or more frequencies to work and use metal detectors for feature analysis; this method is a compromise technology, which can achieve certain results, and the general working conditions will improve the detection of some ferromagnetic metals Sensitivity, but limited performance improvement for stainless steels. The magnitude of the product effect is not only related to the electrical conductivity or magnetic properties of the product, but also to the volume of the product to be tested. When the product has a certain nature, the larger the product package, the stronger the product effect, and the stronger the product effect, the more it affects the detection sensitivity. . In the food industry, due to the particularity of its equipment, the performance of the detector for stainless steel detection is often demanding, so the general intelligent identification method of the detector has a better effect in practical applications.
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