Gravity Instruments (Edit)PPT

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Transcript of Gravity Instruments (Edit)PPT

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    INSTRUMENTASI GRAVITAS

    Amanda Claudiya A

    Andi Haikal Pratama

    Fadli Yusuf 

    M. Radi Hir!an

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    OUTLINE 

     Introduction

     Absolute Measurements of Gravity

     Relative Measurements of Gravity

    a) Portable Pendulum

    b) Torsion Balance

    c) Unstable Gravimeter 

    d) Stable-type Gravimeter 

    e) alibration of Gravimeters

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    INTRODUCTION

    P"n#ukuran Graitasi t"r$a#i % & •  Graitasi A$s'lut •  Graitasi R"latif 

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    Why we need it???

    PENGU(URAN GRAVITASI A)S*+UT

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    PENGU(URAN GRAVITASI A)S*+UT

    % M"t'd" P"n#ukuran

    Graitsi A$s'lut

    Benda Jatuh Ayunan Pendulum

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    GRAVITASI A)S*+UT

      

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    P*RTA)+E PEN-U+UM

      

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    P*RTA)+E PEN-U+UM

      

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    P*RTA)+E PEN-U+UM

      

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    T'rsi'n )alan"

    /'0n Mi0"ll

    1G"'l'#ist2

    H"nry Ca"ndis0

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    T'rsi'n )alan"

    How Torsion Balanes !or"

    a)  A basic torsion balance is a horizontal bar

    suspended from a wire in a glass case.

    Touching the bar to begin with is a stationary

    vertical bar that is both on the inside and

    outside of the glass case.

    b) Touching a charged object to the vertical bar

    will cause both bars to have the same charge

    causing them to separate.

    c) The amount of separation that occurs can be

    used to determine the gravitational force or

    elctrostatic force exerted between the two bars.

    d) The greater the magnitude of gravitational

    force or charge of the bars, the greater the

    ibre twists and the greater the angle of

    rotation is.

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    T'rsi'n )alan"

    #e$unaan Torsion Balane%

    !) "ntu# mengu#ur gaya yang sangat #ecil

    $) "ntu# membuat hu#um %oulomb

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    T'rsi'n )alan"

    30y a T'rsi'n

    )alan"s

    4'rk5555555

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    PENGU(URAN GRAVITASI RE+ATIF

      

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    Unsta&le 'ra(imeter

     Unsta$l" #raim"t"r m'r" s"nsiti" t0an sta$l" #raim"t"r

     T0"r" ar" m as additi'nal mass

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      La,Coste Rom&er$ 'ra(imeter

     Graim"t"r +a C'st" R'm$"r# ini

    t"rdiri dari suatu $"$an 6ada u7un#

    $atan# yan# dita0an 'l"0 Zero Length

    Spring yan# $"rfun#si s"$a#ai 6"#as

    utama. P"ru$a0an $"sarnya #aya tarik $umi akan m"ny"$a$kan 6"ru$a0an

    k"dudukan $"nda8 lalu 6"n#amatan

    dilakukan d"n#an r"s"ttin# k"dudukan

    $"$an 6ada 6'sisi s"mula 1Null  Adjusment2.

     R"s"ttin# ini dilakukan d"n#an

    m"mutar measuring screw . )anyaknya

    6"mutaran Measurung Screw  akan t"rli0at 6ada dial 'unt"r8 yan#

    $"rarti $"sarnya ariasi #aya tarik

    $umi dari suatu t"m6at k" t"m6at

    lain.

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    !orden 'ra(imeter

     3'rd"n Graim"t"r adala0

    alat yan# di#unakan untuk

    6"n#ukuran 6"r$"daan

    #raity $umi8 ("t"litian $a#i

    alat t"rs"$ut yaitu 9.9:

    mili#al

     3'rd"n Graim"t"r ini

    masi0 di#unakan 0in##a s"karan#8 alat ini l"$i0

    muda0 di$a4a dan tin#kat

    k"akuratannya tin##i. Alat

    ini adala0 satu;satunya alat

    yan# suda0 m"na6ai l"$i0

    dari :

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    Sta$l" Graim"t"r

    H''k"=s +a4 &

    Am'unt 'f ">t"nsi'n 'f s6rin#8 is 6r'6'rti'nal t' ">t"ndin#

    f'r".

    k.d> ? m.d#

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    Contoh )ta&le 'ra(imeter

    Askania Graim"t"r Sintr"> CG ;@@M Graim"t"r

    A;:9 Graim"t"r A;:9 Graim"t"r

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    (ali$rasi Graim"t"r

     Untuk m"n#"ta0ui nilai #raitasi 6ada suatu da"ra08

    $iasanya dilakukan 6"n#ukuran #raitasi di dua stasiun

    atau l"$i0 6ada da"ra0 t"rs"$ut. S"0in##a kita

    m"n#"ta0ui nilai # 6ada da"ra0 t"rs"$ut.

     /ika nilai d# diantara stasiun;stasiun t"rs"$ut uku6 $"sar8

    maka da6at dik"ta0ui an'maly 6ada da"ra0 t"rs"$ut

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    (ESIMPU+AN

     P"n#ukuran #raitasi di$a#i % a$s'lut dan r"latif.

    P"n#ukuran r"latif di$a#i % yaitu sta$l" dan unsta$l"

     S"nsitiitas 6"n#ukuran #raitasi unsta$l" B sta$l" B

    a$s'lut

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    R"f"r"n"s

     3.M.T"lf'rd8 +.P.G"ldart and R.E.S0"riff. :9. Applied geophysics. Cam$rid#" Uni"rsity Pr"ss. %nd Ed.

     0tt6&6rini6l"s.'u."du#raD">r"lati".0tm

     R'sid8 Syamsu. -r.8 -rs.8 M.T. Gravity Notes.

     Si"n" Gr'u68 1Mar08 %9:

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