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Your search keyword '"Dimyati, Kaharudin"' showing total 34 results
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34 results on '"Dimyati, Kaharudin"'

13. Low-Cost Integrated Zinc Oxide Nanorod-Based Humidity Sensors for Arduino Platform.

Author

Yusof, Haziezol Helmi Mohd, Harun, Sulaiman Wadi, Dimyati, Kaharudin, Bora, Tanujjal, Sterckx, Karel, Mohammed, Waleed S., and Dutta, Joydeep

Abstract

Realization of a simple integrated and low-cost intensity modulation/direct detection-based humidity and vapor detection system utilizing zinc oxide (ZnO) nanorods as the active material is demonstrated. The sensing device comprises of ZnO nanorods optimally grown on a glass substrate and mounted on 3D printed platform for the alignment with a green light-emitting diode setup for an edge excitation. An Arduino platform was used for the signal processing of the detection of the transmitted light. Both forward and backward scattering are affected due to light leakage while propagating through the glass substrate which are further attenuated in the presence of humidity. In this paper, backward scattering was found to be dominant, and thus, with increasing humidity, a reduction in the transmitted light was monitored. When the sensor was tested in a humidity controlled environment, it was found that the output voltage drops by approximately 750 mV upon changing the relative humidity (RH) level from 35% to 90% in a non-linear fashion. The average sensitivity of the sensor was observed to be −12 mV/% throughout the tested RH levels. Sensitivity was found to be higher at −24.6 mV/% for RH’s beyond 70%. An average response time of 3.8 s was obtained for RH levels of 85% with respect to the standard ambient humidity conditions (RH 50%), which showed a quicker recovery time of 2.2 s. The proposed sensor device provides numerous advantages, including low-cost production, simplicity in design, ease of use, and stability during handling. [ABSTRACT FROM AUTHOR]

Published
2019
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14. Detection of Formaldehyde Vapor Using Glass Substrate Coated With Zinc Oxide Nanorods.

Author

Yusof, Haziezol Helmi Mohd, Jali, Mohd Hafiz, Johari, Md Ashadi Md, Dimyati, Kaharudin, Harun, Sulaiman Wadi, Khasanah, M., and Yasin, M.

Abstract

A glass substrate coated with ZnO nanorods via a hydrothermal method for formaldehyde vapor sensing is reported. The proposed sensor device was characterized against formaldehyde vapor concentrations varying from 1% to 5% with a reference point as 0% (pure water) at room temperature. A significant sensing response was observed where the output voltage reduced by 0.0856 V via scattering effect by ZnO nanorods upon exposure to the maximum tested concentration (5%). The sensitivity and linearity of the sensing response were recorded to be approximate values of −0.0168 V/% and 98.06% correspondingly. The sensor device was found to have good measurement stability in measuring as low as 1% of concentration for a prolonged time of 600 s. This proposed sensor has potential applications in monitoring air pollution caused not only by formaldehyde vapor but also by other harmful and toxic vapors or gases. [ABSTRACT FROM AUTHOR]

Published
2019
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16. Ultrashort Pulse Soliton Fiber Laser Generation With Integration of Antimony Film Saturable Absorber.

Author

Rahman, Mohd Fauzi Ab, Latiff, Anas Abdul, Rosol, Ahmad Haziq Aiman, Dimyati, Kaharudin, Wang, Pengfei, and Harun, Sulaiman Wadi

Abstract

A soliton-locked Erbium-doped fiber laser is demonstrated for the first time using a pure Antimony (Sb) film as a saturable absorber (SA). The SA device is fabricated by depositing a 5 μm Sb layer onto a polyvinyl alcohol thin film via Physical vapor deposition process. Self-starting soliton mode-locked pulses train with a constant repetition rate of 0.99 MHz is obtained as the pump power increased from 101 mW to 142 mW. The laser operates at 1559 nm with a pulse width of 3.53 ps. At the pump power of 142 mW, the maximum peak power and pulse energy are calculated as 5.83 kW and 20.59 nJ, respectively. The obtainable pulse is very stable with a signal-to-noise ratio (SNR) of 70 dB. Our experimental results manifest that the pure Sb thin film-based SA is able to generate mode-locked pulsed laser at the 1.55-micron laser regime. [ABSTRACT FROM AUTHOR]

Published
2018
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