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Author: search.filters.author.Buranasiri, PrathanSubject: search.filters.subject.Digital holography

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    The electrochemical measurements investigation of NiCo2O4for electrode materials of energy storage devices by using digital holography technique
    (2021-01-01)
    Prakobsang, Tawipon
    ;
    Saei, Worawee
    ;
    Kongsubto, Thee
    ;
    Ruttanapun, Chesta
    ;
    Buranasiri, Prathan
    The electrochemical properties of NiCo2O4for using as electrode materials for the potential applications have been investigated by electrochemical measurement which composed of cyclic voltammetry (CV) and galvanostatic chargedischarge (GCD). These processes are generating the ion exchange between the electrode and electrolyte, wherein induce the surface change of the interface. Especially, since in the cycle ability measurement using the potentiostat needed to repeat the cycle into the electrode for many times, the effective of the electrode is reduced. In this research, digital holographic technique was used to investigate the different properties of interface of the NiCo2O4 electrode while operating under the various electrochemical techniques. In our DH recording, the surface change of the electrode was expose at the difference potential scan rate at 1, 5, 10, 50, 100 and 200 mV/s of CV, and the difference current densities at 1, 2, 3, 5, 10 and 20 A/g of GCD and vary times of cycle ability test every 50 cycle times to 1000 cycles. In the end the reconstructed DH images of the electrode have been used to analyze the results from electrochemical measurement.
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    The investigation of corrosion behavior of electrodeposited Co-Fe alloys surface with phase and 3D reconstruction of image using TIE and TPE
    (2018-01-01)
    Srisuwan, Thanthanat
    ;
    Somphonsane, Ratchanok
    ;
    Sutthiruangwong, Sutha
    ;
    Buranasiri, Prathan
    In this research, phase retrieval using transport of intensity equation (TIE) and transport of phase equation (TPE) have been used for determine the surface of corrosion behavior of electrodeposited Co-Fe alloys, an important component in hard disk drive. Without interferometer as used in digital holography technique, by using TIE and TPE, our observing setup is simple and compact. The experimental results show the capability of TIE and TPE for observing the pitting corrosion. The pitting corrosion of Co-Fe image results have also shown. The dynamic process of microstructure surface system would be conducted and may be applied to hard disk drive industry in the future.
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    The direct measurement of the photorefractive grating on anisotropic self diffraction using digital holography
    (2014-09-02)
    Plaipichit, Suwan
    ;
    Buranasiri, Prathan
    ;
    Ruttanapun, Chesta
    ;
    Jindajitawat, Phumin
    In this paper, the measurement of grating period in photorefractive anisotropic self diffraction by using digital holography technique is proposed. In our experimental setup, He -Ne laser beam with wavelength of 632.8 nm has been separated and then incident on photorefractive cerium doped barium titanate crystal to produce photorefractive index grating. The transmitted probe beam, which contains phase and amplitude has been expanded and recorded on digital camera. To explore the grating periods, both phase and amplitude of the images are reconstructed by numerical process using computer. Then the grating periods in photorefractive anisotropic self diffraction have been measured. The results show grating periods, holograms and their reconstruction. © 2014 Taylor & Francis Group, LLC.