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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Indonesian Journal of Electrical Engineering and Computer Science
Asrul Izam Azmi
Universiti Teknologi Malaysia
Computer Science & IT

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Journal : TELKOMNIKA (Telecommunication Computing Electronics and Control)

 1 
Resolution Improvement in Fabry-Perot Displacement Sensor Based on Fringe Counting Method Nur Izzati Ismail; Nor Hafizah Ngajikin; Nor Fadzlina Mohd Zaman; Maisarah Awang; Asrul Izam Azmi; Nik Noordini Nik Abd. Malik; Norazan Mohd Kassim
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 12, No 4: December 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v12i4.123

Abstract

This paper presents an improved Fringe Counting Method (FCM) technique in order to enhance the displacement resolution of a Fabry-Perot Displacement Sensor (FPDS). A simulation model of a FPDS based on the improved FCM has been developed and simulated for nanometer displacement range by using MATLAB mathematical software. Unlike conventional FCM that analyzed the number of fringes produced over one time period, the improved FCM analyzed the number of fringes for one largest Free Spectral Range (FSR). In this work, the initial length of Fabry-Perot Interferometer (FPI) cavity has been set at 75 μm due to limitation of the machining precision equipment. For the displacement analysis, the improved FCM technique is used as an algorithm. The research results prove that this FPDS could detect displacement at 10nm resolution over a working range of 40 nm. It showed that the improved FCM technique managed to enhance the capability of the conventional FCM in detecting nanometer displacement. 
Discrete liquid level fiber sensor Muhammad Yusof Mohd Noor; Ahmad Sharmi Abdullah; Asrul Izam Azmi; Mohd Haniff Ibrahim; Mohd Rashidi Salim; Norazan Kassim
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 4: August 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v17i4.12769

Abstract

A novel simple fiber sensor to sense liquid level is presented. The operation principle is based on the relative Fresnel reflective intensity. The sensor consists of a fiber splitter with the configuration of one input to multiple fiber outputs, i.e. 1×4, 1×8 and 1×12 arrangements that act as a discrete liquid level. A broadband source (BBS) is used as the light source supply. The total reflected power intensity is measured using a power meter. Experimental results show that the power intensity decreases as the level of liquid is increased. The sensor has a simple configuration, low cost, and it can be customized for a wide height measurement range spanning from a few centimeters up to a hundred meters.
Characterization of Erbium Doped Photonic Crystal Fiber Farah Diana Mahad; Abu Sahmah M.Supa'at; David Ian Forsyth; Tong Sun; Asrul Izam Azmi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 3: September 2016
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v14i3.3655

Abstract

Photonic crystal fibers (PCFs) which exhibit unique and tremendous optical properties have been undergoing quick growth in recent years. Studies on the characteristics of various types of PCFs have been reported. However, characterization on erbium-doped PCF has not previously been investigated. Therefore, in this paper, an erbium-doped core PCF having 7 rings of hexagonal air holes has been modeled. A perfectly matched layer (PML) is modeled within the PCF structure and simulated using Finite Element Method (FEM) using COMSOL software. The PML is optimized by varying the radius and thickness of the layer. Modal properties of the PCF have been investigated in terms of its effective index of the supported fundamental mode, confinement loss and thickness of the perfectly matched layer. This erbium-doped PCF has a confinement loss of 1.0E-6 at 1500 nm and a maximum effective refractive index of 1.476. This paper gathers useful data, which could be used for studying the characteristics of a PCF.
Co-Authors Abu Sahmah M.Supa'at Ahmad Sharmi Abdullah David Ian Forsyth Farah Diana Mahad Fauzan Ahmad Maisarah Awang Maslina Yaacob Michael David Michael David Mohd Haniff Ibrahim Mohd Rashidi Salim Muhammad Yusof Mohd Noor Nabihah Hussin Nik Noordini Nik Abd. Malik Nor Fadzlina Mohd Zaman Nor Hafizah Ngajikin Norazan Kassim Norazan Mohd Kassim Nur Izzati Ismail Sevia Mahdaliza Idrus Tay Ching En Marcus Tong Sun