Desain Sensor Konsentrasi Larutan NaCl Menggunakan Serat Optik Moda Jamak dengan Model W-System

Abstract

Telah didesain sensor konsentrasi larutan NaCl berbasis serat optik mode jamak dengan model W-System. Dalam pengkarakterisasiannya digunakan detektor BF5R-D1-N yang terdapat  ligh emiting diode (LED) sebagai sumber cahaya dengan panjang gelombang 660 nm dan phototransistor sebagai detektor penerima cahaya tersebut. Dengan menganalisa nilai absorbsi pada panjang gelombang ultra violet dan cahaya tampak, Indek bias larutan NaCl,  dan rugi daya yang dialami sensor ini akibat microbending, bending, dan scattering. Didapatkan besarnya rugi daya yang dialami sensor sebanding dengan besarnya kosentrasi NaCl yang diberikan. Pemberian jarak antar kaki memberikan perbedaan sensitifitas pada pengukuran dan nilai sensitifitas maksimum pada jarak 2,5 cm. Sistem kerja sensor juga ini mampu menghitung konsentrasi larutan NaCl dengan jangkauan 0,0 – 5,0 Molar dan akurasi hingga 0,025 Molar.

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