Background analysis:

The most important issue in the food industry is safety. During the food processing, metal impurities will be occasionally introduced, posing a major threat to people's health. In January 2016, the British bread manufacturer Sainsbury took the initiative to recall certain types of whole wheat bread out of fear of contamination by small pieces of metal object in the bread. Common methods for detecting metal foreign object in food: visual control, sieve, magnetic attraction, metal detection and X-ray detection, etc. The application range and effect are different, and each has its own advantages and disadvantages. The online monitoring device of metal foreign object composed of Guochuang Micro-magnetic Basic Sensor Array can detect even the fine ferromagnetic metal, with a detection rate of 100%. Bulk materials and packaging products can be detected online without causing secondary pollution, producing obvious effects.

 Principle:

The magnetic anomaly target contains materials or currents with ferromagnetic characteristics (such as iron, cobalt, nickel, etc.), and the magnetic field strength is inversely proportional to the target distance cube, H∝M/R³. We use Guochuang Micro-magnetic Basic Sensor Array to detect the magnetic anomaly information caused by the ferromagnetic target, and determine the feature information of the ferromagnetic target according to the corresponding model algorithm.

 Technical solution:

The schematic diagram of metal object detection is as follows. The metal foreign object monitoring device is mainly composed of Guochuang Micro-magnetic Basic Sensor Array, which can monitor whether there are ferromagnetic metal impurities in the food production process and send an early warnings in time.

                                                                                           

Schematic   diagram of metal foreign object detection in production line

 

In the above-mentioned food production line, two Guochuang Micro-magnetic Basic Sensors are installed to monitor the magnetic abnormal signals in the food online in real time. When there are ferromagnetic metal foreign matter in the food, relevant alarm devices will be triggered to lock the food containing ferromagnetic foreign object. The locked food is automatically rejected and enters the unqualified product warehouse to ensure safe food production.

 

 The main components of the system:

1. The metal foreign object detection device is composed of micro-magnetic basic sensor array, communication module, digital signal unit, etc.;

2. The micro-magnetic basic sensor array is fixedly installed in the metal foreign object detection device;

3. Related algorithms include: micro-magnetic basic sensor array calibration, environmental noise suppression, processing of magnetic anomaly targets small signal, etc.;

4. Data center: collection of data and information such as micro-magnetic basic sensor array data and magnetic anomaly early warning signals;

5. Terminal console: display the working status and early warning information of the metal foreign object detection device.