Boonsang, Siridech

Preferred name

Boonsang, Siridech

Alternative Name

Boonsang, S.

Main Affiliation

School of Engineering

siridech.bo@kmitl.ac.th

Now showing 1 - 10 of 22

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A highly sensitive laser-EMAT imaging system for biomedical applications
(2014-10-15)
Boonsang, S.
;
Dewhurst, R. J.
This paper describes a novel technique using an elctromagnetic acoustic transducer (EMAT) for biomedical photoacoustic measurements. The physical principle underlying and EMAT sensor is based on the detection of electromagnetic signals, which are responses from the interaction of ultrasonic waves and magnetic fields within the electrically conductive sample surface. A recent prototype EMAT sensor has miniaturized the receiver size (1.0 cm diameter). It is incorporated with a specially designed low noise preamplifier. Calibration procedures with a Michelson interferometer revealed that the EMAT sensor detected small displacement amplitudes as low as 1.0±0.2 pm in ultrasonic frequency range using an aluminium sample. For the first time, we present the use of an EMAT sensor to detect photoacoustic pressure signals in tissue phantoms and real tissues (chicken breast) in vitro. Corresponding B-scan images were constructed by the compilation of a series of received photoacoustic signals. A B-scan image of human hairs in a chicken breast sample revealed that the lateral resolution about 1.57 mm (FWHM) was achieved.
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Cloud-based optical characterization of hard disk drive recording heads
(2018-01-01)
Khunrattanasiri, Weerayuth
;
Yokpradit, Anchyza
;
Tongloy, Teerawat
;
Boonsang, Siridech
In the hard disk drive (HDD) industry, the measurement of flying height is crucial for the verification of the recording head air-bearing design. The flying performance of recording heads has to be measured and compared with the original design to assure the reliability of HDDs. Optical interferometry is normally used to measure the flying height of recording heads. The key parameter for setting up the measurement is the refractive index, whose values normally deviate depending on machine conditions during the manufacturing processes. The variation in refractive index cannot be identified during flying height measurement because there is no on-line technique for doing so. In this paper, we present a novel technique using inhouse designed micro-ellipsometry to measure the complex refractive index combined with data transfer to a private cloud network via the Internet of Things message queuing telemetry transport (IoT MQTT) protocol. Therefore, the measurement of the complex refractive index can be carried out for each recording head and we can improve the precision of the flying height measurement. In addition, the information about refractive index not only can be shared with a flying height tester to correct the variation in each recording head but also can be used to assist air-bearing designers in the instantaneous validation of their design.
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Highly-transparent multi-layered spin-coated silk fibroin film
(2017-01-01)
Wasapinyokul, Kamol
;
Kaewpirom, Supranee
;
Chuwongin, Santhad
;
Boonsang, Siridech
In this study, the silk fibroin films with different numbers of layers were fabricated by the spin-coating method and their optical transmittances were observed. The process to synthesise the silk fibroin solution was explained - starting from the silk cocoon until the silk-fibroin solution, approximately 7.5% concentration wt/vol, was obtained. The solution was spin-coated onto clean glass substrates to fabricate samples. Totally 10 samples with different numbers of layers, from 1 to 5 layers, were obtained. All samples can be separated into two groups: those left dried at room temperature after spin-coating and those heated at 60°C. They were then measured for their transmittance over the visible-to-near-infrared region. All samples exhibited the high transmittance where the values were at 95% and 98%, for the samples at room temperature and those at 60°C, respectively. This was believed to be due to the heating effect that caused the silk fibroin to arrange itself after being heated, hence the higher transmittance. These high transmittances were maintained regardless of the number of layers and length of heating time. Results from this study could be used to fabricate a silk fibroin film with high optical transmittance and adjustable other properties.
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Uncertainty analysis of polarization interferometric measurements of hard disk drive recording head-media dynamic spacing
(2012-06-12)
Boonsang, Siridech
;
Aroonjarernchay, Wanchai
In this paper the numerical method based on Monte-Carlo techniques is utilized for the analysis of the flying height measurement uncertainty. In the current flying height tester, the prediction of error is the main concern in order to assure the attainable precision. In previous study, a simplified analytical method is normally used and it may not provide the accurate results of the error prediction especially when the amount of the flying height values becoming as low as sub-5 nm. In this paper, instead of using the analytical method for error analysis, the numerical method based on Monte-Carlo techniques is utilized. Our simulation results show that the measurement uncertainty is mainly from the variation in the optical constants of the DLC layer. They also show that the increasing of standard deviation of the optical constants of DLC layer causes the higher measurement uncertainty.
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Reflection image model for micro-ellipsometer
(2019-07-01)
Khunrattanasiri, Weerayuth
;
Boonsang, Siridech
High accurate distance measurement currently favors optical techniques. Ellipsometer usually can find the optical properties. The data from the Ellipsometer will transfer to distance data but micro-ellipsometer can provide more accurate than general ellipsometer. The micro-ellipsometer use the back focal plane of an objective lens and measures the optical properties in the different angles. The micro-ellipsometer result is the intensity image. The light reflection model can give us original light reflection images of any objects by determining the refractive index of the material and create a reflection image model. This research created optical reflection models of S<inf>i</inf> O<inf>2</inf>, Au, Ti and Al.
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A numerical model for ultrasonic measurements of swelling and mechanical properties of a swollen PVA hydrogel
(2010-08-01)
Lohakan, M.
;
Jamnongkan, T.
;
Pintavirooj, C.
;
Kaewpirom, S.
;
Boonsang, S.
This paper presents a numerical model for the evaluation of mechanical properties of a relatively thin hydrogel. The model utilizes a system identification method to evaluate the acoustical parameters from ultrasonic measurement data. The model involves the calculation of the forward model based on an ultrasonic wave propagation incorporating diffraction effect. Ultrasonic measurements of a hydrogel are also performed in a reflection mode. A Nonlinear Least Square (NLS) algorithm is employed to minimize difference between the results from the model and the experimental data. The acoustical parameters associated with the model are effectively modified to achieve the minimum error. As a result, the parameters of PVA hydrogels namely thickness, density, an ultrasonic attenuation coefficient and dispersion velocity are effectively determined. In order to validate the model, the conventional density measurements of hydrogels were also performed. © 2010 Elsevier B.V. All rights reserved.
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An image-based visual servo control system based on an eye-in-hand monocular camera for autonomous robotic grasping
(2017-01-09)
Tongloy, Teerawat
;
Boonsang, Siridech
This paper presents an image-based visual servo control system incorporating with an eye-in-hand monocular camera without using the interaction matrix as traditional method. Instead, we propose the modified image-based visual servo control system for monocular from point error and area error. By using the method derived from the point error and area error of features and one value of the simple depth estimation, we can find camera velocity whereas a traditional method we need to know every depth values for each feature for determining the camera velocity. In addition, a physical eye-in-hand robot system is developed and implemented in order to validate the proposed algorithm. The experimental results obtained from the systems show significant improvement in control performances.
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Analysis of multi-hop wireless sensor networks using probability propagation models
(2019-01-01)
Jaksukam, Komgrit
;
Tongloy, Teerawat
;
Chuwongin, Santad
;
Boonsang, Siridech
This paper presents a formula for estimating the probability of collecting a given amount of data from a propagation model and multi-hop wireless sensor networks (WSNs) based on Monte Carlo simulation with cluster-tree topology. The probabilistic model is based on an analytical model of the IEEE 802.15.4 MAC protocol. The probability of successful node transmission is extended to the probabilities of successful collection at the cluster P(X=k) and sink node P(X ≥ k). A numerical example has been provided for comparing the probabilities. We propose a model to calculate the probability from the ratio of the collection rate to the total number of nodes and therefore provide the likeliness of complete data collection. Finally, the results from our analysis provide an estimation of the probability of achieving successful transmission in WSNs.
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An interferometric back focal plane microellipsometry for the determination of optical properties of a slider's air bearing surface
(2014-02-12)
Khunrattanasiri, Weerayuth
;
Boonsang, Siridech
This paper presents a back focal plane microellipsometer combined with a polarized shifting interferometer. This system is used for the determination of optical phase shift on reflection of a slider's air bearing surface. These optical properties are essential parameters for the flying height measurements in a HDD manufacturing process. The resulting phase shifting images were processed by using Windowed Fourier filters and phase unwrapping techniques, in order to precisely determine the phase of a back focal plane image. The phase images were then used to determine the optical phase shift on reflection values. The results from an aluminum sample show that the measured optical phase shift on reflection values are comparable to the standard values.
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Uncertainty analysis of polarization interferometric measurements of hard disk drive recording head-media dynamic spacing
(2012-12-01)
Boonsang, Siridech
;
Aroonjarernchay, Wanchai
In this paper the numerical method based on Monte-Carlo techniques is utilized for the analysis of the flying height measurement uncertainty. In the current flying height tester, the prediction of error is the main concern in order to assure the attainable precision. In previous study, a simplified analytical method is normally used and it may not provide the accurate results of the error prediction especially when the amount of the flying height values becoming as low as sub-5 nm. In this paper, instead of using the analytical method for error analysis, the numerical method based on Monte-Carlo techniques is utilized. Our simulation results show that the measurement uncertainty is mainly from the variation in the optical constants of the DLC layer. They also show that the increasing of standard deviation of the optical constants of DLC layer causes the higher measurement uncertainty. © 2012 IEEE.

Boonsang, Siridech

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