# Ferromagnetic Objects Magnetovision Detection System

^{*}

## Abstract

**:**

## 1. Introduction

## 2. Results and Discussion

**Figure 1.**Schematic block diagram of the measuring system: HMR 2300—magnetoresistive sensor, Sample—investigated object, Sm—stepper motors, C—motor controllers, MI 3.8.9—trajectory generator, Ps—power supply, PC—controlling and image processing computer.

**Figure 3.**Visualization of induction vectors value and direction on measurement lines for simple dipole sample, with magnetic background removed. Additional disturbances of the magnetic field can be clearly seen.

**Figure 4.**Visualization of the distribution of the magnetic induction vector absolute values, with the magnetic background intact. In addition to positive and negative disturbances, the Earth’s magnetic field can be seen.

^{2}); ${\mathsf{\mu}}_{0}=4\mathsf{\pi}\cdot {10}^{-7}\frac{H}{m}$ magnetic permeability of vacuum; $C=\frac{{\mathsf{\mu}}_{0}}{2\pi}\overrightarrow{m}$ —induction replacement constant (Tm

^{3})

_{1}and P

_{2}will be similar. Therefore:

_{1}; $\stackrel{\rightharpoonup}{{B}_{P2}}$ —result of flux density measurement in plane P

_{2}; $\stackrel{\rightharpoonup}{{B}_{B1}}$ , $\stackrel{\rightharpoonup}{{B}_{B2}}$ —Background magnetic induction values in P

_{1}, P

_{2}planes. Assuming: $\stackrel{\rightharpoonup}{{B}_{B1}}\cong \stackrel{\rightharpoonup}{{B}_{B2}}$ , $\stackrel{\rightharpoonup}{{B}_{1}}>\stackrel{\rightharpoonup}{{B}_{2}}$ . Then:

_{2}from the results in the plane P

_{1}. Differential bi-plane measurement gives the absolute value of the difference in magnetic induction value between the measurement planes.

## 3. Experimental Section

**Figure 7.**Measurement of the position of dangerous object (Swiss army knife): (

**a**) biplane differential measurement; (

**b**) gradient measurement without background separation; (

**c**) a photograph of the actual position within 100 mm of the sample.

**Figure 8.**Application of the developed method of measurements to determine the location of a buried sample: (a) Comparison of the actual sample position (red circle); and (b) measurements results.

## 4. Conclusions

## Acknowledgments

## Conflicts of Interest

## References

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**MDPI and ACS Style**

Nowicki, M.; Szewczyk, R.
Ferromagnetic Objects Magnetovision Detection System. *Materials* **2013**, *6*, 5593-5601.
https://doi.org/10.3390/ma6125593

**AMA Style**

Nowicki M, Szewczyk R.
Ferromagnetic Objects Magnetovision Detection System. *Materials*. 2013; 6(12):5593-5601.
https://doi.org/10.3390/ma6125593

**Chicago/Turabian Style**

Nowicki, Michał, and Roman Szewczyk.
2013. "Ferromagnetic Objects Magnetovision Detection System" *Materials* 6, no. 12: 5593-5601.
https://doi.org/10.3390/ma6125593