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Author: search.filters.author.Boonsri, Chantira

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    Contact Angle Measurement of Melting SnAgCu Solder Paste Mix with Carbon Allotropes Using In-Line Digital Holography Technique
    (2021-01-01)
    Mamart, Wikatsama
    ;
    Somdock, Nuttakrit
    ;
    Boonsri, Chantira
    ;
    Plaipichit, Suwan
    ;
    Buranasiri, Prathan
    In this research we investigated the contact angle of commercial SnAgCu solder paste mixing with some carbon allotropes such as graphite, graphene quantum dots, and fullerene of varying concentrations with melting temperature, wettability, interfacial microstructure. The wettability was assessed in terms of the contact angle. The in-line digital holography was used for determining the contact angle and morphological of samples at each temperature which the samples have been heating from room temperature until the melting temperature. In the experiment, only one beam was used as the object and reference beams which recorded by a CMOS camera. The recorded image was reconstructed by the angular spectrum digital holography numerical programing. Using the reconstructed images of our results, the shape and contact angle of solder pastes can be investigated.
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    Determination of thermal expansion coefficient for thermoelectric CaMnO3 with a shadow method
    (2020-01-01)
    Boonsri, Chantira
    ;
    Limsuwan, Pichet
    ;
    Buranasiri, Prathan
    We have measured thermal expansion coefficient of a bulk CaMnO<inf>3</inf> thermoelectric module with a cylindrical shape, using a shadow method. The CaMnO<inf>3</inf> module has been heated from the room temperature up to 773 K. At each temperature, the shadow image has been recorded by a CMOS camera and reconstructed with a HoloViewer program in MATLAB. Then the diameters of the module have been obtained at different temperatures in the region 300–773 K. Finally, we have determined the linear thermal expansion and the thermal expansion coefficient for CaMnO<inf>3</inf>. Our results demonstrate that the expansion coefficient for the bulk CaMnO<inf>3</inf> thermoelectric module depends linearly on the temperature in the region under study.
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    Improving qualitative phase imaging using error eliminating assist of two-steps phase shifting method in digital holography system
    (2019-01-01)
    Boonsri, Chantira
    ;
    Seesan, Thitiya
    ;
    Buranasiri, Prathan
    In this research, the mapping of the path length difference that involves the specimen is proposed for improving qualitative phase imaging (QPI) techniques. Phase-quality images are developed using the principle of phase- shift in digital holography and then this system has been applied to investigate biological cells and tissues. In our setup a microscopic digital holographic interferometer with polarizers and a quarter wave plate has been designed for detecting cells specimen. The resulting image contains information of the thickness in any area and the refractive index of the specimen. Moreover, a quadrature - phase shifting holography (QPSH) technique is purposed. Experimental results are shown improving QPI. Merits and limitations of this method are also described.
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    Quality Investigation of surface mount technology using phase-shifting digital holography
    (2016-01-01)
    Boonsri, Chantira
    ;
    Buranasiri, Prathan
    Applying of a phase-shifting digital holography combined with compressive sensing to inspect the soldering quality of surface mount technology (SMT) which is a method for producing electronic circuits. In SMT, the components are mounted and connected with each other directly onto the surface of printed circuit boards (PCBs). By reconstructing the multidimensional images from a few samples of SMT, the results are solved by an optimization problem. In this paper, two problems have been concerned. The first one is to examine the devices and the soldering quality of connections between them, which are in micro-scaled. The second is to observe the effect of heat treatment of soldering material and devices on the surface mount board.
      1
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    Laser-based mosquito repelling module
    (2012-12-01)
    Boonsri, Chantira
    ;
    Sumriddetchkajorn, Sarun
    ;
    Buranasiri, Prathan
    This article proposes and shows that a low-optical-power laser when arranged in a zigzag fashion in a free space can create strong air thermal stress and form a chemical-free optical net that is capable of repelling adult mosquitoes away. Experimental proof of concept using a pointer-like diode-pump solid-state laser (447 nm wavelength and 500 mW maximum) and reflective sheets shows that all 80 adult Aedes albopictus mosquitoes are completely trapped inside the open glass chamber. Most of the adult mosquitoes prefer to stay near the bottom of the open glass chamber as it is cooler than the top part that contains several zigzagging laser beams. Reducing air thermal stress via increasing the spacing between the two adjacent laser beams allows the adult mosquitoes to easily escape out of the zone of the laser beams. © 2012 IEEE.