Analisis Intensitas Citra Tetesan Air dengan Metode Laser Speckle Imaging

Authors

  • Feri Helmi Basri Jurusan Fisika FMIPA Universitas Andalas
  • Harmadi Harmadi Jurusan Fisika FMIPA Universitas Andalas
  • Marzuki Marzuki Jurusan Fisika FMIPA Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.6.4.311-317.2017

Abstract

Analisis nilai intensitas citra tetesan air dengan metode Laser Speckle Imaging telah dilakukan. Penelitian ini menggunakan sistem perancangan forward-scattering. Sistem terdiri dari tiga unit yaitu transmitter sebagai sumber cahaya menggunakan laser He–Ne, receiver sebagai detektor menggunakan CCD (Charge Couple Device), dan penampil menggunakan PC. Transmitter dan receiver diposisikan sejajar dengan jarak yang telah diatur agar berkas cahaya laser menyinari detektor CCD pada sudut 00 untuk mendapatkan citra spekel. Intensitas citra spekel dikarakterisasi menggunakan 6 manik-manik dengan diameter berbeda (2,15 - 11,91 mm). Nilai intensitas citra spekel tertinggi didapatkan pada diameter manik-manik 2,15 mm yaitu 254,62 a.u dan terendah pada manik-manik 11,91 mm yaitu 224,5 a.u. Hasil karakteriasi menunjukkan bahwa intensitas citra spekel menurun ketika objek yang terdeteksi berukuran lebih besar. Hasil yang sama juga didapatkan menggunakan tetesan air dari tabung yang berlubang dengan diameter 1-7 mm. Citra spekel tetesan air dianalisis menggunakan fungsi autokorelasi untuk mendapatkan ukuran bulir spekel. Ukuran bulir spekel terbesar didapatkan pada diameter lubang tetesan 6 mm yaitu 856,87 µm dan terkecil didapatkan pada diameter lubang tetesan 1 mm yaitu 198,15 µm. Hasil yang diperoleh menunjukkan bahwa semakin besar tetesan air, maka nilai intensitas citra spekel menurun dan ukuran bulir spekel membesar.

Kata kunci : citra, forward-scattering, gray scale, laser He-Ne, ukuran bulir spekel

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Published

2017-10-03

Issue

Vol. 6 No. 4 (2017)

Section

Articles

License

Copyright (c) 2017 Feri Helmi Basri, Harmadi Harmadi, Marzuki Marzuki

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