Rancang Bangun Alat Ukur Kelembaban Udara Berbasis Sensor Serat Optik Evanescent dengan Cladding Gelatin Tulang Sapi Menggunakan Transmisi Ethernet Shield
DOI:
https://doi.org/10.25077/jfu.7.4.359-366.2018Abstract
Telah dirancang bangun alat ukur kelembaban udara berbasis sensor serat optik evanescent dengan menggunakan cladding gelatin tulang sapi. Cladding gelatin tulang sapi dibuat dengan metode hidrolisis HCl dengan variasi perendaman 2 hari dan 4 hari. Variasi panjang pengupasan cladding serat optik adalah 1 cm, 2 cm, dan 3 cm. Pengukuran kelembaban udara dilakukan di dalam humidity chamber. Sistem sensor terdiri dari laser dioda sebagai sumber cahaya, serat optik cladding tulang sapi sebagai pengindra kelembaban, fotodioda sebagai fotodetektor, mikrokontroler sebagai pengolah sinyal dan ethernet shield sebagai transmisi data nilai kelembaban melalui plafon internet  thingspeak. Kelembaban diukur berdasarkan tegangan keluaran fotodioda. Semakin tinggi kelembaban udara maka semakin tinggi tegangan keluaran fotodioda. Hasil karakterisasi sensor menunjukkan serat optik dengan panjang pengupasan 1 cm adalah yang paling optimum dalam mengindra kelembaban. Nilai sensitifitas sensor yang dirancang adalah 0,0299 V/%RH dengan koefisien determinasi R2 = 0,977. Persentase rata-rata kesalahan alat ukur yang dirancang adalah 2,25 % dibandingkan dengan alat ukur acuan (humidity meter).
Kata kunci: kelembaban udara, sensor serat optik, evanescent, ethernet shield.
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Copyright (c) 2018 Tomi Irawan, Harmadi Harmadi
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