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All Journal Jurnal Fisika Unand Jurnal Ilmu Fisika
Deswilan, Sixtinah
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Astronomy Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Characterization of Multiple-bend Optical Fiber Extensometer Design for Landslide Sensor Costrada, Aldo Novaznursyah; Deswilan, Sixtinah; Kemal, Badrul Mustafa; Harmadi, Harmadi
Jurnal Ilmu Fisika Vol 13, No 1 (2021): Published in March 2021
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.13.1.1-7.2021

Abstract

Design of multiple-bend extensometer based on optical fiber as landslide sensor has been characterized. Multiple-bending characterization has been done by varying the winding number of optical fiber FD-620-10 to obtain the photodiode's effective light intensity.  The light intensity in the extensometer was set by varying the laser diode resistance in the range (150 – 250) Ω.  The optimum sensitivity of 0.03984 V/cm was obtained for triple winding of optical fiber. The designed optical extensometer is able to monitor the displacement with an error of 0.59%. This result indicates that the designed extensometer is the more bending on optical fiber, the more its sensitivity and the bending loss.
Prototype of Rainfall Intensity Measurement Using CCD TSL1401CL Linear Sensor Array Deswilan, Sixtinah; Costrada, Aldo Novaznursyah; Harmadi, Harmadi
Jurnal Ilmu Fisika Vol 13, No 1 (2021): Published in March 2021
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.13.1.18-25.2021

Abstract

A prototype measurement of rainfall intensity was developed using a CCD TSL1401CL linear sensor array. The prototype consists of a He-Ne laser that functions as a light source, which later is focused by the beam expander and conditioned by a convex lens. Each pixel will receive the same voltage depending on the light intensity so that it produces a decimal value of ADC. This ADC decimal value determines rainfall intensity based on the diameter and velocity of the raindrops. The diameter variations used ranges from 1 mm to 10 mm, while for variations in the height of rainfall are 50 cm, 100 cm, and 150 cm. The test results proved that the greater the decimal value of the ADC is, the smaller the diameter of the raindrops detected will be, and vice versa. The values of the diameter and velocity of were used to obtain the value of rainfall intensity. The percentage value of error measuring rainfall intensity is 3.11% when compared to the rain gauge module is still considered rather accurate. However, direct testing is still needed when rain falls with various types and intensities.  
Rancang Bangun Alat Pendeteksi Kebisingan Berbasis Sensor Serat Optik Deswilan, Sixtinah; Harmadi, Harmadi
Jurnal Fisika Unand Vol 8 No 3 (2019)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.8.3.245-251.2019

Abstract

Telah dilakukan rancang bangun alat pendeteksi kebisingan berbasis sensor serat optik dengan metode ekstrinsik. Alat pendeteksi kebisingan terdiri dari sensor serat optik yang menggunakan sumber cahaya berupa dioda laser, serat optik FD-620-10 step index multimode dan fotodetektor OPT101. Sensor serat optik digunakan untuk mengukur frekuensi dan tingkat tekanan bunyi dengan memanfaatkan perubahan tegangan keluaran. Perubahan tegangan keluaran terjadi akibat adanya variasi jarak membran terhadap serat optik. Pengujian pertama dilakukan uji coba alat ukur dengan alat pembanding dan aplikasi frequency generator. Hasil pengujian menunjukkan bahwa pada pengukuran frekuensi 1000 Hz sampai 5000 Hz memiliki presentase kesalahan rata-rata 4,65% serta tingkat tekanan bunyi memiliki presentase kesalahan rata-rata 3,30%. Pengujian kedua dilakukan di dalam ruangan menghasilkan rentang frekuensi sekitar 1000 Hz sampai 9000 Hz dengan tingkat tekanan bunyi alat ukur 47 dB sampai 86 dB dan alat pembanding 53,8 dB sampai 58,2 dB serta persentase kesalahan rata-rata 1,51% dan 1,67%.Kata Kunci : bunyi, frekuensi, kebisingan, membran, serat optik.
Co-Authors Costrada, Aldo Novaznursyah Harmadi Harmadi Kemal, Badrul Mustafa