Rerkratn, Apinai
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Rerkratn, Apinai
Alternative Name
Rerkratn, A.
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Email
apinai.re@kmitl.ac.th
67 results
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Item type:Publication, Linear Variable Differential Transformer Signal Conditioning Circuit Based on Phase-Locked LoopThe purpose of this paper is to propose a novel technique for extracting the position signal from an inductive displacement transducer named a linear variable differential transformer (LVDT). In general, the movement of the LVDT core causes its primary inductance change in linear form. The primary winding of the LVDT is used as a time-dependent element for the triangular and square wave generator, which can be called self-oscillation, to generate frequency. The advantage of the proposed technique is that it can measure the displacement using the LVDT without an external oscillator. The change in primary inductance causes the frequency deviation generated by the oscillator. The deviated frequency is captured and converted into a voltage signal using the principle of the phase-locked loop. All the components used in this study are commercially available. The merits of this proposed technique are simple configuration, small size, and low cost. Moreover, the operating range of the LVDT can be extended without the limitation of the nonlinear transfer characteristic. The performance of the proposed technique is discussed in detail and confirmed by experimental implementation. Experimental results show that the maximum error from the proposed technique is about 0.42% and the operating range of the LVDT can be extended to more than 200%. It can be seen that the proposed technique is suitable for embedded measurement in small or micro robots. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Non-destructive Fertility Detection of Multiple Chicken Eggs Using Image Processing and Convolutional Neural Network(2020-07-30) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, 8-Electrode data collection system for electrical capacitance tomography(2006-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Integration of wireless HART network system into SCADA software for operation & management(2016-11-18); ; This paper describes the technique to integrate HART field devices into SCADA (Supervisory Control and Data Acquisition) system. Wire HART field device is connected to WirelessHART adapter (THUM) and WirelessHART device are assigned act as RTU(Remote Terminal Unit) in SCADA system. In system, THUM and WirelessHART device communicate to WirelessHART gateway that collects their data and send to master station with Modbus/TCP. The paper presents the practices to install and configure the THUM with control valve wire HART device, WirelessHART transmitter, tags assignment, and so on that focus for HART parameters mapping in order to device operation and management. Effectiveness of the proposed system integration is verified by simulation and experimental results. Moreover, the technique can be applied in existing plants or in new project to support end-users to quickly and easily gain the benefits of device diagnostic and decision support for operation and management. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Real-time fault notification for billboard lighting system(2017-11-24); Kaewpoonsuk, AnuchaThis paper presents a technique to implement the alert system for the faults of billboard lighting system. The proposed system consists of the current sensor module SCT-013-005 used to measure the overall current consumption of the billboard lighting system, ARDUINO UNO R3 used as the controller to determine the faults, and GSM module used to remotely transmit faulty data to the data server as well as to the user mobile via short message service. The alert data composes the current consumption of lighting system, number of the bulbs with abnormal condition, and identification number of base station. In addition, the conditions for sending notifications can be set. The billboard lighting system using seven bulbs connected in parallel is employed to test the performance of the proposed notification system. Test results verify that the proposed system can function correctly. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple resistance-to-time converter with lead-wire-resistance compensation(2011-01-01); ; Pootharaporn, NakornThis paper presents a simple resistance-to-time converter for remotely measuring resistance of single resistive sensors. The proposed circuit employs commercially available devices to generate the output pulse whose time interval is linearly proportional to the sensing resistance. Experimental results are given to confirm not only the good operation but also the effective lead-wire-resistance compensation of the proposed converter. © 2011 SICE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Position signal detector for linear variable differential transformer(2020-12-01); ; This paper presents the position signal detector for linear variable differential transformer (LVDT) based on RMS-to-DC converter. The proposed detector consists of the differential amplifier, the comparator, the phase detector, the controllable unity-gain inverting/non-inverting amplifier and the RMS-to-DC converter. The proposed technique provides a simple scheme and uses the low cost commercial available devices such as opamp, transistor and digital logic gate. The experimental testing with the commercial LVDT model OP12.5G from Solartron Metrology showing the proposed position signal detector can produce the output voltage corresponding to the measured displacement with satisfactory values and good linearity. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple LVDT demodulator(2020-10-13); ; A simple technique to realize demodulator for linear variable differential transformer (LVDT) is presented in this paper. The proposed LVDT demodulator is based on sample and hold technique. The proposed scheme consists of peak detector, phase detector, monostable circuit, sample and hold circuit, and controllable unity-gain inverting/noninverting amplifier. The presented technique employs the simple and low-cost devices such as op-amp, and digital logic gate. Experimentation with the commercial LVDT model OP12.5G from Solartron metrology shows that the proposed LVDT demodulator provides the output voltage corresponding to the movement of LVDT core with satisfactory values and good linearity. The maximum error of the proposed demodulator is about 1.5%. In addition, the output magnitude of proposed LVDT demodulator can be adjusted by variable resistor (VR1) without the external circuit requirement. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, ZigBee based wireless temperature monitoring system for shrimp farm(2015-12-23); Kaewpoonsuk, AnuchaThis paper proposes a design and implementation of wireless temperature monitoring system for shrimp farm based on ZigBee technology. The proposed system consists of three wire resistance temperature device (RTD) type PT-100, Current source circuit, XBee Pro module, 2.4 GHz antenna with gain 5dBi, Arduino Uno R3 microcontroller board and LabVIEW program for monitoring and control system. Experimental results with standard temperature bath show that the proposed system can monitor temperature with satisfied data. The maximum error of temperature is about 0.25 percents. The maximum range of system is about 500 meters. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, 4-channel bio-impedance measurement system for medical applications(2004-12-01);