Analisis Kecepatan Aliran Air Berbasis Metode Laser Speckle Imaging
DOI:
https://doi.org/10.25077/jfu.8.2.178-183.2019Abstract
Telah dilakukan analisis kecepatan aliran air dengan metode Laser Speckle Imaging (LSI). Sistem LSI menggunakan pendekatan forward scattering. Sistem terdiri dari tiga unit yaitu transmitter menggunakan laser He-Ne, receiver menggunakan CCD (Charge Couple Device), dan penampil menggunakan PC. Objek penelitian menggunakan air yang dijatuhkan dari wadah dengan diameter lubang yang divariasikan pada ketinggian yang berbeda. Hasil pengukuran kecepatan aliran air dari wadah berdiameter 1 mm pada ketinggian 50 cm memiliki nilai kecepatan terendah yaitu sebesar 0,73 ml/detik. Nilai tertinggi dihasilkan dari wadah berdiameter 5 mm pada ketinggian 150 cm yaitu sebesar 15,49 ml/detik. Ukuran diameter lubang dan ketinggian jatuh air semakin besar, maka nilai kecepatan aliran air semakin besar. Pengukuran intensitas citra juga dilakukan untuk melihat korelasi dengan kecepatan air. Nilai intensitas terendah yaitu 238,45 a.u diperoleh dari tetesan air dengan diameter 5 mm dan nilai tertinggi yaitu 253,12 a.u diperoleh pada diameter 1 mm. Ukuran diameter wadah semakin besar maka nilai intensitas citra semakin kecil. Intensitas citra berbanding terbalik dengan nilai kecepatan aliran air.
Kata kunci : kecepatan alir, butiran hujan, intensitas citra, laser
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Copyright (c) 2019 Havizzullah Havizzullah, Harmadi Harmadi, Marzuki Marzuki
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