Question

working principle of metal dectector

Answer 1

$\bold{METAL\: DECTECTOR}$

●It is a device that can detect metal , the basics can make a sound when it near some metal or it is used to sense any existing metal which is nearby. metal detectors works on the principle of transmitting a magnetic field and analysing a return signal from the target .when some metals are coming close to the coil , the amplitude of the reflective pulse is getting little lower and a duration of the pulse a little longer.

●it is used in many places like theatres, shopping malls , hotels etc .

$\bold{simple\: metal\: detector}$ =

☆it is an electronic device .

☆ An oscillator which produces AC current that passes through a coil producing an alternating magnetic field .

☆A part of the metal in near to the coil, eddy current will be induced in the metal.

☆This produces a magnetic field of its own.

☆if another coil is used to measure the magnetic field.

☆The change in the magnetic field due to the metallic object can be detected .

☆ Metal detectors are used to detect the weapons like guns , knives in the airports.

SIMPLE METAL DETECTOR CIRCUIT :--
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● The main components a simple metal detector circuit are LC circuit , proximity sensor and the buzzer.

●The LC circuit is nothing but inductor and capacitor ,which are connected in parallel.

●The LC circuit activates the proximity sensor when it senses any metal close to it .

● The sensor glow the LED and makes a buzzer.

Answer 2

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A metal detector , works on the principles of electromagnetic Induction..It has more Induction Coils present in it..that helps to interact with the metallic elements.

When a current is given or flown through the coil , it turns into blue..

And the magnetic field penetrants ryt through it..The magnetic field makes an electric current flow inside...the metallic object...!

Thanks

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