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    SINE INTERNATIONAL INSTITUE OF TECHNOLOGY,

      JAIPUR

    SUBMITTED TOMR.PUSHPENDRA GUPTA

    LECTURER OF EEE DEPT.

    SUBMITTED BY

     AKASH BAGHEL

      SACHIN CHOUDHARY

      KHUSIRAM MEENA 

    ASEMINAR PRESENTATION ON

      METAL DETECTER PROJECT

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    Contents:-

    Principle of work Types of metal detector

    Advantages of pulse induction method

    Components of metal detector Things must be observed in designing

    metal detector

    Application for metal detector

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    • Principle of operation of metaldetector:-

     The operation of a metal detector is based onthe principle of electromagnetic induction.

    Metal detectors contain one or more inductorcoils. hen metal is placed in a close pro!imityto a varying magnetic "eld #generated by thecoil or coils$% currents are induced in the metallicpart .

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     These current are called eddy Currents. Theeddy Currents% in turn% induce their own

    magnetic "eld # called eddy "elds$ .

     These "elds act in such a direction as to oppose

    that generated by the coils. The resultant "eld# & applied ' & eddy $ and usinga specially designed electronic circuit canindicate the type of material being magneti(ed.

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    • Types of Metal detectors:-

      )- Pulse induction detector #P*$.

      +-,eat-freuency oscillator #,/$ . 

    0-1ery 2ow reuency #12$ .

     

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    1ery 2ow reuency #12$ .

    3ses two coils: -Transmitter coil #search head% antenna$

    -4eceiver coil

     There is a delay in the received signal

    compared to the transmitted signal

    called phase shift

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    The circuit: A simplified di!"m #f $%e &i"&'i$ is s%#() i) Fi!. *. I$ &) +e

    di,ided i)$# fi,e se&$i#)s-

     *p#(e" s'ppl/.

     0 &l#&1i)!.

     2$")smi$ pl's "e&ei,e" f"#)$e)d. 3"e&ei,e" +&1e)d.

     4'di#.

     E&% se&$i#)

    &) +e +'il$ )d $es$ed se5'e)$ill/.

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    Block diagram

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    clocking

     The master clock generator is a 555 timer #*C5$.

     The 555 oscillator has two controls.4+ varies thefreuency of the main pulse% and 40 varies the

    pulse width .

     The freuency of the main pulse determine howmany times per second the coil is pulsed.

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    6enerally% ahigher pulse freuency allows for afaster coil motion and perhaps a little betternoise performance%while consuming more power.

    1arying the main pulse width determines howlong the coil is turned on%which can a7ect depthof detection

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      * The advantages of detectors:-

     8mit an electromagnetic signal of higherintensity and thus % these signals penetrate fardeeper into the ground than continuously

    emitted signals. Cover large areas in less time.

     9earch coil or loop of a pulse induction metaldetector is simpler than 12 instrument.

      A single coil of wire is commonly used for boththe transmit and receive functions% while in 12two coils are needed transmit coil and receive

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      the coil:-

     we use a mono coil *mportant coil parameter are coil diameter%

    number of windings% wire gauge.

     The standard coil for this design has diameter of) inches and +; turns.

     The diameter a7ect the depth and sensitivity%and the number of winding a7ect the magnetic

    "eld.

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    the time it takes for a target signal todecay can vary because of the si(e%shape% and chemical makeup of theobs rely on the ability of anad

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      Applications of metal detectors:-

     )- Can be used in archaeological digging

     +- As a compact hand metal detector for security

     0- &ardware for 9alvage work

     - As a Toy

     5-Treasure hunter% for caches of coins%

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    THANK

     YOU