Simulated the Basic Metal Detector pattern in Etap and Fabricated a real time miniature of working prototype.

1. E-M-T PROJECT
By
Waqas
METAL DETECTOR

2. CONTENT
Introduction
 Concept Behind
 Types And Application
 Components
 Budget
 Circuit
Conclusion

3. INTRODUCTION
Metal detectors contain one or more inductor
coils that are used to interact with metallic elements on the ground. The single-
coil detector illustrated below is a simplified version of one used in a real metal
detector. A pulsing current is applied to the coil, which then induces a magnetic
field shown in blue. When the magnetic field of the coil moves across metal,
such as the coin in this illustration, the field induces electric currents (called
eddy currents) in the coin. The eddy currents induce their own magnetic field,
shown in red, which generates an opposite current in the coil, which induces a
signal indicating the presence of metal

4. CONCEPT BEHIND
Based on the principles of electromagnetic induction. It generates a
rapidly changing magnetic field by running the alternating current though coil,
which will generate eddy currents inside the metal objects. Thereby, the eddy
currents will create a new magnetic field that affects the original one, and then
the metal detectors will utter a high-pitched tone. The accuracy and reliability
of the metal detectors depend on the stability of frequency of electromagnetic
launchers. Generally, the frequency is between 80 to 800 KHz. The lower the
frequency, the better detection for iron objects. Similarly, the higher the
frequency, the better detection for high carbon steel objects. The sensitivity of
the metal detectors decreases with the expanding detecting range. Moreover,
the induction signal depends on the metal particle size and conductivity.

5. TYPES
 Pulse Induction Detectors
 Beat Frequency Detectors
 Very Low Frequency Detectors
APPLICATIONS
 Security Purpose
 Archaeological Findings
 Food Processing
 Geological Detections

6. COMPONENTS
 9V battery
 47k ohm resistors
 2.2μ F capacitor
 Speaker(8 ohm impedance)
 Copper wires (0.2 mm in diameter)
 IC 555
 PCB board

7. CIRCUIT

8. PROCESS
Detection Passing of Signals

9. Estimated = 200

10. By
Waqas
CONCLUSION
At the End of Project we would able to
Understand the Working of a Metal-Detector And to apply the concept
of Electro-Magnetic theory in various field of Engineering.