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DEVELOPMENT AND EXPERIMENTAL CHARACTERIZATION OF AN IOT-CONTROLLED RGB LED LIGHTING SYSTEM FOR HYDROPONIC APPLICATIONS
(2026-01-01)
Worsoongnern, S.
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Yindeesuk, W.
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Kamoldilok, S.
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Srinuanjan, K.
;
Limsuwan, P.
This study presents the development of an Internet of Things-based RGB LED lighting system for precise, flexible light control in hydroponic plants. The system consists of 480 high-power RGB LEDs controlled by an ESP8266 microcontroller, enabling real-time adjustment of light intensity, photoperiod, and color ratios via a smartphone. Pulse-width modulation duty-cycle modulation enables the generation of white light suitable for different stages of plant growth. Experimental results show a linear correlation between illuminance and duty cycle for all color channels. Spectral analysis confirms stable emission within the photosynthetically active radiation range (400–700 nm), with the spectral composition remaining unchanged even when brightness is reduced (dimming). The system demonstrates high control accuracy and adaptability for regulating plant growth lighting, particularly for leafy vegetables such as lettuce.
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Ultrawide-range refractive-index sensor based on asymmetric integrated Y-junction optical waveguide
(2023-01-01)
Phongwisit, P.
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Kamoldilok, S.
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Limsuwan, P.
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Srinuanjan, K.
We present a novel ultrawide-range refractive index (RI) sensor based on an asymmetric Y-junction optical splitter. A cylindrically shaped rod with a diameter of 350 nm and a height of 1000 nm with a different RI is inserted into a junction of the asymmetric Y-junction waveguide. This rod serves as a sensing area. Our sensor is simulated using a finite-difference time-domain technique. The splitting ratio is studied for the cases of two operating wavelengths, 1480 and 1550 nm. The results show that the splitting ratio can be described as a parabolic function of the RI of the sensing area at both operating wavelengths. An approximately linear relationship between the splitting ratio and the RI occurs in a narrower RI region of 1.00–1.50, thus enabling to design an ultrawide-range RI sensor. The sensor sensitivities at the wavelengths 1480 and 1550 nm are equal respectively to 0.2653 and –0.4908 RIU<sup>–1</sup>, with the corresponding R<sup>2</sup> parameters amounting to 0.9889 and 0.9777. Our device can serve as an ultrawide-range optical RI sensor for identification of micro-scale biochemical or chemical specimens.
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360 degree white light holography display on surface of transparency conical cup
(2021-01-01)
Srinuanjan, K.
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Kamoldilok, S.
This paper presents the method and experimental results of the construction and reconstruction of three dimensions conical holography. He-Ne laser is used as the construction light source. Then the construction light is shone on top of a transparency conical cup, where a plain holographic film is wrapped around and attached to its surface. The object is located at the bottom of the cup. In this manner, the cup acts as a captured screen. After exposure, the film is developed and fixed by a chemical solution. The three-dimensional holography is recorded in the film. For reconstruction, we used red LED and flashlight as a reconstruction light source. The film is wrapped around and attached to the surface of the cup again. When the reconstruction light shines on the cup, the three-dimensional holography appears in the center of the cup. The cup is rotated in step, each step is 45 degrees, and the image is recorded by the digital camera. Experimental results show that the 360 degrees three-dimensional holographic image is successfully reconstructed. In conclusion, we could apply the method to create a three-dimensional holographic for displaying in all directions.
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Analysis of effective numerical aperture in 2-D photonic crystal waveguide
(2014-01-01)
Chantakit, T.
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Kamoldilok, S.
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Srinuanjan, K.
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Yupapin, P. P.
The effective numerical aperture calculation in two-dimensional Photonic crystal waveguide has been proposed. In this paper we present the analysis of ray optics refracted inside nano rods and at the boundaries between rods, which separates rod gap is much smaller than the incident wavelength assumed to reflect on the region. In operation, the resolving numerical aperture was compared with the finite difference time domain method via OptiFDTD software. Although numerical aperture mentioned above was found to be extremely close to fiber optics, a transmission passes though compartments of the rods are observed due to significant estimation of transmission and reflection of electric field. The compared simulation results will be discussed. By the aforementioned is that in the near future we will modify wave equation in periodic media of waveguide structures reached to the transverse electric equation of beam propagation in the two-dimensional Photonic crystal waveguide analysed. © (2014) Trans Tech Publications, Switzerland.
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Micro plasma source design using WGMs a PANDA ring
(2014-01-01)
Siriroj, R.
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Srinuanjan, K.
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Yupapin, P. P.
Plasma is a one of state of matter that is produced by applying energy into gas or fluid like, where the ionized electrons from gas or fluid atoms to be free electrons. In this paper, the use of micro plasma source generation by using a PANDA ring resonator is introduced, in which the whispering gallery modes (WGMs) are formed within the center ring and can be used to create the high power of electromagnetic wave for gas plasma production. In application, the micro plasma source can be fabricated in small scale material process or others suitable operation. In this case, the plasma source can be decreased to be micro-scale device, where in fact, the common plasma source system size is large because the high energy source to produce high power plasma is required. Finally, the detail of using such small scale plasma source is discussed. The theoretical details of whispering gallery mode and quantum tunneling effects are also reviewed and discussed. © (2014) Trans Tech Publications, Switzerland.
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A fabrication of galvanic cell from pineapple peel residue in agricultural industries
(2014-01-01)
Pancharoen, A.
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Poomjan, S.
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Taengtang, T.
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Srinuanjan, K.
In this research, we present a fabrication of an electric generation experimental kit which is comprised of pineapple peel residue from agricultural industries. Juice from squeezing pineapple peel was used as electrolyte of a galvanic cell. Sufficient acidity of the juice could activate electrochemical reaction in the galvanic cell kit using a zinc plate and copper plate as electrodes. During the experiment, adjustable distances between the two electrodes were controlled to obtain maximum output voltage. It has been already known that a galvanic cell with a lower distance between electrodes could provide higher output voltage but both electrodes could not touch each other. Experimental results from controlling distances between the 2 electrodes showed that the galvanic cell kit could provide high output voltage of 1.00 V which was able to apply in electronic devices. © (2014) Trans Tech Publications, Switzerland.
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An electricity generator model by the water delivery system of sanitary ware
(2014-01-01)
Panthong, S.
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Poomjan, S.
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Taengtang, T.
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Srinuanjan, K.
In this research is presented electricity production of sanitary ware, which can be covered kinetic energy of water to electric current from water delivery system. A small electric generator will be set on the water delivery system of sanitariums. It consists with a turbine electric generator and a big tank which build in on tank of a sanitarium. Turbine generator is generated small electric currents by a lot of water inside pipe. If this system were set in a large building for example such as department store, etc. the electric currents would be on generating in order to cumulative energy. In which Bangkok has a population about ten millions of people which sanitariums are used about a hundred millions of time per day. The experimental results of this model can be calculated electric currents to compare with systems which were set on large building. © (2014) Trans Tech Publications, Switzerland.
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SOLITON SPIN in AN ADD-DROP OPTICAL FILTER for LONG DISTANCE SPIN TRANSPORT
(2012-03-01)
Teeka, C.
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Aziz, M. S.
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Pipatsart, S.
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Srinuanjan, K.
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Ali, J.
A new concept of an optical spin generation using bright and dark soliton conversion behaviors within a modified optical add-drop filters known as a PANDA ring resonator is proposed. The orthogonal solitons can be formed randomly within the system and detected simultaneously at the output ports. Under the resonant condition, the orthogonal solitons corresponding to the left-hand and right-hand solitons (photons) can be generated. Whenever a photon is absorbed by an object, an angular momentum of either + ℏ or - ℏ is imparted to the object, in which two possible spin states known as soliton spins are exhibited. Many soliton spins, i.e., many particles, dynamic spin and long distance spin transport using the proposed design are also discussed.
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Force sensing device design using a modified add-drop filter
(2012-01-01)
Kulrod, K.
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Sirawattananon, C.
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Mitatha, S.
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Srinuanjan, K.
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Yupapin, P. P.
We propose a new sensing device using a modified add-drop filter known as a PANDA ring resonator type, in which the sensing unit is consisted of an optical add/drop filter and two nanoring resonators, where one ring is placed as a sensing device, the other ring is set as a reference. In operation, the external force is assumed to exert on the sensing ring resonator, which can form the measurement. The finite difference time domain (FDTD) method called Optiwave is used to manipulate the sensing behaviors of the proposed system. The obtained results have shown that the change in wavelength due to the change in sensing ring radii is seen, in which the wavelength shift of 1 nm resolution is achieved. The recovery and the reciprocal signals can also be formed, which can be used to approach to many advantages of measurements, including the possibility of standardizing measurement accuracy. The behavior of light within a PANDA ring resonator is also analyzed and reviewed. © 2010 Published by Elsevier Ltd.
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Multiphotons trapping instability using fiber Bragg's grating potential perturbation for multiquantum bits encoding
(2011-03-01)
Vanishkorn, B.
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Srinuanjan, K.
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Yupapin, P. P.
We propose an interesting result of the trapped multiphotons distribution within a fiber Bragg's grating. The multitrapped photons are confined by the potential well, where the motion of photons in a fiber Bragg's grating is affected by the external perturbations, which they are defined as a series of nonlinear parametric in terms of potential energy. This investigation is modeled by using the nonlinear coupled mode equations and under Bragg's resonance condition, where the initial frequency of the light, ω<inf>0</inf> is the same value as the Bragg's frequency, ω<inf>B</inf>. Results obtained have shown that the higher perturbation series represents the potential well is much differed from the equilibrium situation. In applications, the external perturbations on the fiber grating can cause the trapped photons instability, which introduces the escaped photons from the potential well being detected and observed. The potential of applications for quantum encoding device can be performed, which is analyzed and discussed in details. © 2010 Elsevier GmbH All rights reserved.

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