Gravity Instruments (Edit)PPT

8/17/2019 Gravity Instruments (Edit)PPT

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INSTRUMENTASI GRAVITAS

Amanda Claudiya A

Andi Haikal Pratama

Fadli Yusuf

M. Radi 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 Graitasi t"r$a#i % &• Graitasi A$s'lut• Graitasi 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

Graitsi A$s'lut

Benda Jatuh AyunanPendulum


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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 Mi0"ll

1G"'l'#ist2

H"nry Ca"ndis0


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T'rsi'n )alan"

How Torsion Balanes !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 Balane%

!) "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$l" #raim"t"r m'r" s"nsiti" t0an sta$l" #raim"t"r

T0"r" ar" m as additi'nal mass


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La,Coste Rom&er$ 'ra(imeter

Graim"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 akant"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 Graim"t"r adala0

alat yan# di#unakan untuk

6"n#ukuran 6"r$"daan

#raity $umi8 ("t"litian $a#i

alat t"rs"$ut yaitu 9.9:

mili#al

3'rd"n Graim"t"r ini

masi0 di#unakan 0in##as"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"na6ai l"$i0

dari :


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Sta$l" Graim"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 Graim"t"r Sintr"> CG ;@@M Graim"t"r

A;:9 Graim"t"r A;:9 Graim"t"r


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(ali$rasi Graim"t"r

Untuk m"n#"ta0ui nilai #raitasi 6ada suatu da"ra08

$iasanya dilakukan 6"n#ukuran #raitasi 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 #raitasi di$a#i % a$s'lut dan r"latif.

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

S"nsitiitas 6"n#ukuran #raitasi 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&6rini6l"s.'u."du#raD">r"lati".0tm

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

Si"n" Gr'u68 1Mar08 %9:


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