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TMT614421 Teknik Tomografi Metalurgi Click to addPart Text 1
Definisi Thomos : Slice atau Potongan
Tomografi ?? Graphia : Image atau Gambar ( Beck and Williams, 1996 ) Tomografi yaitu proses eksplorasi karakteristik internal suatu objek.
Tomogram : is a two-dimensional image representing a slice or section through a three-dimensional object .
Tomograf : Instrument/system to generating tomogram.
Jenis Tomografi berdasar Sumber Data Principle
Spatial resolution (%)
Practical Realization
Comments
Electromagnetic radiation
1
Optical
Fast. Optical access required
X-ray and γ-ray
Slow. Radiation containment
Positron emission
Labelled particle. Not on-line
Magnetic resonance
Fast. Expensive for large vessels
Acoustic
3
Ultrasonic
Sonic speed limitation. Complex to use
Measurement of electrical properties
10
Capacitive; conductivity; inductive
Fast. Low cost. Suitable for small or large vessels
Prinsip Tomografi 1.
Proses
pengambilan
data
proyeksi melalui sensor yang dipasang di sekeliling obyek.
2 1
Forward Problem
Distribusi Sifat Fisika
Gambar 9. Prinsip Tomografi
Inverse Problem
2.
Proses
rekonstruksi
untuk
mendapatkan citra dalam obyek dari data proyeksi menggunakan
Algpritma.
Gambar 10. Contoh Proyeksi citra 2D dengan
Sistem Tomografi Listrik (kapasitansi) Sistem sensor:
Sistem Akuisisi Data:
Sistem Visualisasi:
Mengelilingi objek, mendistribusikan sifat fisika, dan menerima data distribusi sifat fisika objek.
mengumpulkan dan menyiapkan data dari sensor, serta memprosesnya sehingga dihasilkan berupa data pengukuran
Kontrol dan Pengolahan data pengukuran menjadi citra objek.
Perbandingan Tomografi Listrik
Measurement Mode In an ECT sensor, the number of available independent capacitance measurements M is a function of the total number of plates n according to the formula M=n(n-1)/2
Measurement Matrix
Cm matrix elements (in the form of the measurement triangle) (a) 8-electrode sensor, (b) 12-electrode sensor. The picture below presents an example of measurements for a 12-electrode sensor
Sensor
12 electrode ECT sensor – schematic – cross-section view ECT electrodes sensor cross-section diagram, ε1, ε2 indicate different electric permittivities of distinct flow phases
