Perancangan, Pembuatan dan Karakterisasi Tranduser Ultrasonik 3,5 MHz Untuk Pengujian Bahan Padat
Submission Date: 2013-07-23 12:58:01
Accepted Date: 2013-09-01 00:00:00
Abstract
Dalam tugas akhir ini telah dibuat sepasang transduser ultrasonik untuk pengujian bahan padat. Konstruksi transduser ultrasonik yang dibuat terdiri dari holder berbahan akrilik dan kuningan, backing material berbahan styrofoam, epoxy dan busa karet, elemen aktif berbahan piezoelektrik dan matching layers menggunakan akrilik. Bahan penyusun konstruksi tersebut dilakukan pengujian untuk mengetahui karakteristik transduser ultrasonik.Dari hasil pengujian yang telah dilakukan diperoleh karakteristik transduser ultrasonik dengan holder berbahan akrilik, backing material berbahan styrofoam, frekuensi resonansi sebesar 3.5 MHz, bandwith sebesar 2.04 MHz, respon impulse >10 siklus, delay sebesar 1,6 us ,Q (faktor kualitas mekanis getaran harmonis) sebesar 1,667 dan impedansi sebesar 78,6 ohm. Untuk pengujian cacat bahan didapatkan hasil bahwa transduser ultrasonik bisa mendeteksi adanya cacat dan mengestimasi panjang ukuran cacat dengan error pengukuran sebesar 0.5 cm. Namun, kedalaman cacat tidak bisa ditentukan sehingga dibutuhkan pengukuran sistem echo untuk memperbaiki pengukuran tersebut.
Keywords
Piezoelektrik, pengujian bahan padat, Transduser, ultrasonik.
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