Rancang Bangun Sistem Pencacah Frekuensi Untuk Sensor Gas Quartz Crystal Microbalance
Submission Date: 2014-02-12 13:01:24
Accepted Date: 2014-03-15 00:00:00
Abstract
Dalam suatu sistem identifikasi gas menggunakan sensor Quartz Crystal Microbalance (QCM) diperlukan sebuah pencacah frekuensi yang digunakan untuk menghitung perubahan frekuensi dari sensor. Sistem ini digunakan untuk menghasilkan output berupa perubahan frekuensi yang akan diproses untuk identifikasi gas. Metode ini menggunakan selisih antara frekuensi sensor QCM dan frekuensi referensi. Hasil dari selisih tersebut dibagi dan digunakan untuk mengaktifkan pencacah frekuensi. Semakin besar bilangan pembagi, maka sistem pencacah frekuensi ini semakin stabil dan akurat. Penelitian ini menggunakan kristal referensi 20MHz dengan pencacah frekuensi 24 bit. Data hasil pencacahan diakuisisi oleh mikrokontroler dan dikirim ke komputer untuk proses identifikasi menggunakan neural network. Output dari neural network ini merupakan hasil dari proses identifikasi gas. Dengan metode yang digunakan, perubahan frekuensi yang dapat dideteksi mencapai 0,068 Hz. Dalam pengujian keseluruhan sistem digunakan 3 bahan uji, yaitu alkohol, amoniak, dan asam asetat (cuka).Untuk sistem identifikasi gas telah dapat mengenali gas uji dengan keberhasilan 90%. Secara keseluruhan, metode ini diharapkan menjadi metode yang baik untuk sistem identifikasi gas.
Keywords
pencacah frekuens;, QCM; neural etwork
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