pertemuan 11 sistem pengukuran ultrasonik
DESCRIPTION
Pertemuan 11 Sistem Pengukuran Ultrasonik. Matakuliah: H0262 / Pengukuran dan Instrumentasi Tahun: 2005 Versi: 00 / 01. Learning Outcomes. Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Mahasiswa dapat menjelaskan sistem pengukuran ultrasonik - PowerPoint PPT PresentationTRANSCRIPT
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Pertemuan 11
Sistem Pengukuran Ultrasonik
Matakuliah : H0262 / Pengukuran dan Instrumentasi
Tahun : 2005
Versi : 00 / 01
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Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
• Mahasiswa dapat menjelaskan sistem pengukuran ultrasonik
• Mahasiswa memahami sistem pengukuran ultrasonik
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Outline Materi
• Materi 1 : Ultrasonik transmitter
• Materi 2 : Impedansi akustik
• Materi 3 : Prinsiop transmisi ultrasonic
• Materi 4 : Efek Doppler
• Materi 5 : Ultrasonik Doppler Flowmeter
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Dengan sistem pengukuran ultrasonik dapat dilakukan pengukuran ketebalan, level dan aliran.
Sistem pengukuran ultrasonik
Sistem pengukuran ultrasonik
Gb. 11.1 Basic ultrasonic transmission link
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- prinsip piezoelectric
Direct effect : q = dF
Inverse effect : X = dVq = d k x
i = dq
dt
dan F = d k V
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6Gb. 11.2 Piezoelectric ultrasonic transmitter
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d1
wn2 s2 + 2
wn
s +1
XVs
=
Gb. 11.3 equivalent electrical circuit for crystal
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ZE (s) = L1 s + R1 + 1C1s
H (jw) =w R1 C1 – j (1 – w2 L1 C1)
w [(C + C1) – w2 L1 CC1 ] + jw2 CC1 R1
w1 = C + C1
L1 C1 C
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Prinsip ultrasonic trasmission
Gb. 11.4 gelombang longitudinal
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dy = dy sin wL ( t ± )y
cL
cL = fL L longitudinal wave
cT = fT T transverse wavecL = P
(gas)
cL = B (liquid)
cL = E (1 – v)(1+v) (1-2v) (solid)
cT = s
ZA = P (impedansi akustik)
RA = c
W = P2
RA = 2 RA (intensitas akustik / power)
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• Refelction a refraction antara 2 material
R = (R2 – R1)2
(R2 + R1)2
T = 4 R1 R2
(R2 + R1)2
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12Gb. 11.5 reflection a refraction antara 2 material
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Efek Doppler
Gb. 11.6 efek doppler
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f ` = f(c ± v)
c ` = ( )
±c v
c
Gb. 11.7 pulse reflection teknik
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Ultrasonic doppler flowmeter
Gb. 11.8 Doppler flowmeter
f =2fc (cos)v
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Gb. 11.9 ultrasonic cross-corelation flowmeter
Rxy () = limT
1T
T x(t-) y (t) dt
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<<ISI>>
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<< CLOSING>>