Sriratana, Witsarut
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Preferred name
Sriratana, Witsarut
Alternative Name
Sriratana, W.
Main Affiliation
Email
witsarut.sr@kmitl.ac.th
5 results
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Item type:Publication, Error analysis of temperature measurement system: A case of PT100(2009-01-01); ; Seangratipen, TawatchaiThis paper presents the study of uncertainty in measurement as well as the error compensation of the industrial temperature instrument under various conditions for precise and reliable results of the measurement. In this study, the temperature calibration system of PT100 was used as a case study. Data used in analysis were collected from 200 values of repetitive temperature measurement in the range of 25 °C to 100 °C using Data logger together with a computer to process, analyze, and collect in database system which was developed from Visual Basic. The efficiency and characteristics of the developed system were statistically analyzed from error, mean, standard deviation, and uncertainty of each measured value to improve the reliability of the instrument which is used in industrial processes. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Analysis of capacitive variation using parallel-plates method(2009-12-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An experimental study of natural lighting for energy conservation using top-up control method(2008-12-01); ; Tanachaikhan, LerdlekhaThis paper presents the experiment-based analysis of interior illuminance from natural lighting through clear glazed window of a reference room located in Bangkok, Thailand, during February to May 2007 as a case study. The point illuminances measured by photoconductive sensors were collected every 5 minutes and the average interior illuminance from natural lighting were then calculated instantaneously. In this study, natural lighting also aims to reduce the requirement of electric lighting during daytime (7 am-5 pm) of the reference room. If natural lighting alone cannot supply the light at the required value, the electric lighting is assumed to be switched on under top-up control method to maintain the standard illuminance level. The average interior illuminance, which comprises of natural light and electric light, is controlled to be stable at the IES standard level of 500 lux. Nine sets of high performance lamp, 56 lm/W of efficacy, are assumed to supply the light to meet the standard condition. The requirements of supplementary lighting and possible savings during the test months are finally estimated. © 2008 SICE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Declined angle analysis of shaft using magnetic field measurement(2009-12-01); ; Klongratog, PanuponThis paper presents the method to develop sensor for measuring shaft rotation and angular decline based on trigonometric and Pythagoras method. Magnetic flux density on the direction of constant magnetic field was measured using Helmholtz Coil as a magnetic field generator and using Hall Generator No. A1302 as a sensor. The resolution of shaft rotation was 1 degree per step and the range of shaft decline was varied from 4 to 10 degree away from the origin which was normal to ground level. Angle declining from the origin which is normal to magnetic field can be determined by measuring the relationships between Hall voltage and magnetic filed. If the shaft which was fixed on Hall Generator was rotated and not perpendicular to magnetic field, the Hall voltage was varied and the results was then transferred to computer to evaluate the angular decline of shaft. It can be indicated that the voltage varies sinusoidally while increasing the decline angle. Despite low costs of system, the method presented in this study was developed with consideration of effectiveness and reliability. Moreover, the method can be applied in machine alignment as well as in detection of building structure declination. © 2009 SICE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design of capacitive sensor for concentration measurement(2006-12-01); Tanachaikhan, LerdlekhaThis paper presents the analysis of ideal equivalent circuit of the developed concentration sensor probe for chemical solutions by regarding to reasonable costs and reliability of device. The designed sensor probe consists of 2 parallel electrode plates that are coated by Nylon with 0.4 mm thick and mounted together by Resin with 2.5 mm of gap (0.09 times greater than electrode width). Any capacity changes will be compared with the electric circuit that is obtained from the Good Will R-L-C standard instrument, model CTR, at the frequency extending from 100Hz to 2 kHz. From the experiments, it was found that the sensor designed for Ethyl Alcohol solution within concentration of 5% to 95% and 10% concentration interval, at room temperature of 23°C and frequency of 100 Hz, can provide the results with high linearity as well as high resolution of capacity change which is 2 pF per 1% of concentration. © 2006 ICASE.