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Pertemuan 11 Sistem Pengukuran Ultrasonik

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

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Pertemuan 11 Sistem Pengukuran Ultrasonik

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  1. Pertemuan 11Sistem Pengukuran Ultrasonik Matakuliah : H0262 / Pengukuran dan Instrumentasi Tahun : 2005 Versi : 00 / 01

  2. Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : • Mahasiswa dapat menjelaskan sistem pengukuran ultrasonik • Mahasiswa memahami sistem pengukuran ultrasonik

  3. Outline Materi • Materi 1 : Ultrasonik transmitter • Materi 2 : Impedansi akustik • Materi 3 : Prinsiop transmisi ultrasonic • Materi 4 : Efek Doppler • Materi 5 : Ultrasonik Doppler Flowmeter

  4. Sistem pengukuran ultrasonik Dengan sistem pengukuran ultrasonik dapat dilakukan pengukuran ketebalan, level dan aliran. Sistem pengukuran ultrasonik Gb. 11.1 Basic ultrasonic transmission link

  5. - prinsip piezoelectric q = dF Direct effect : Inverse effect : X = dV q = d k x dq i = dt dan F = d k V

  6. Gb. 11.2 Piezoelectric ultrasonic transmitter

  7. d X = 1 Vs 2  s2 + s +1 wn2 wn Gb. 11.3 equivalent electrical circuit for crystal

  8. 1 ZE (s) = L1 s + R1 + C1s w R1 C1 – j (1 – w2 L1 C1) H (jw) = w [(C + C1) – w2 L1 CC1 ] + jw2 CC1 R1 C + C1 w1 = L1 C1 C

  9. Prinsip ultrasonic trasmission Gb. 11.4 gelombang longitudinal

  10. P P s B     E (1 – v) (1+v) (1-2v)  P2 RA y dy = dy sin wL ( t ± ) cL cL = fLL longitudinal wave cT = fT T transverse wave cL = (gas) (liquid) cL = cL = (solid) cT = ZA = (impedansi akustik) RA = c W = = 2 RA (intensitas akustik / power)

  11. Refelction a refraction antara 2 material 4 R1 R2 T = (R2 + R1)2 (R2 – R1)2 R = (R2 + R1)2

  12. Gb. 11.5 reflection a refraction antara 2 material

  13. Efek Doppler Gb. 11.6 efek doppler

  14. (c ± v) c v ± f ` = f ` =  ( ) c c Gb. 11.7 pulse reflection teknik

  15. Ultrasonic doppler flowmeter Gb. 11.8 Doppler flowmeter 2f (cos)v f = c

  16. Gb. 11.9 ultrasonic cross-corelation flowmeter 1 T Rxy () = lim x(t-) y (t) dt T T

  17. <<ISI>>

  18. << CLOSING>>

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