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    Item type:Publication,
    Low-cost tunable light source using RGB-LED module for absorption spectroscope
    (2019-01-01)
    Kamoldilok, Surachart
    ;
    Phongwisit, Phachara
    ;
    Tipaphong, Weraphan
    This paper focused for possibility to use RGB-LED module as a tunable light source for absorption spectroscope. Nowadays, commercial instrument uses Xenon lamp with Monochromator to select a specific wavelength for tested some properties on a sample. This part is a core of performance in an instrument and it increase cost of an instrument. In this paper, RGB-LED module will replace for a part of Xenon lamp and Monochromator to select a specific wavelength for measurement absorption or transmission properties. By used Arduino controller with pulse-width modulation method (PWM), a specific wavelength can control by mixed light that emitted from RGB-LED module. Resolution from this method can tuned an optical wavelength in range of visible light (400-700 nm) by 5 nm. Results from this work had difference from the commercial instrument less than 5%. Accuracy of this setup was proved with standard deviation (SD) and uncertainty about 0.0904 and 0.0286. This work can apply for light source to studies absorption or transmission properties of material in basics laboratory.
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    A nano-scale transducer using a PANDA type ring resonator for gas sensor applications
    (2012-03-01)
    Srinuanjan, Keerayoot
    ;
    Kamoldilok, Surachart
    ;
    Tipaphong, Weraphan
    ;
    Yupapin, Preecha P.
    We present a new system of nano-scale gas sensor using PANDA type ring resonator, whereas the sensing unit is a splitting ring resonator with two and four gaps. The method of finite difference time domain (FDTD) via the computer programming called Opti-wave was used to analyze and simulated all the parameters. The two systems were compared and the simulation result shown that the system of four splitting gaps is better resolution and more linear relationship than two splitting gaps unit. Finally, we found that this system can be used to be a high-precision self-calibration nano-scale gas sensor with in the of resolution of 1 nm. © 2011 Elsevier GmbH. All rights reserved.
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