Kitiphol Chitsakul

8-Electrode Data Collection System For Electrical Capacitance Tomography

An 8-electrode data collection system for electrical capacitance tomography is presented. The system mainly consists of a signal generator, 8times2 multiplexer, detector, amplifier, band-pass filter, rms-to-dc converter, A/D converter circuit and control computer. Experimental results with a circular sensor show that the proposed system is able to collect data with satisfactory sensitivities, linearity, resolution and also being insensitive to noise. Reconstructed images from collected data are shown

High current low frequency eddy current imaging system

Eddy current technique plays an important role in non destructive test. Based on the principal of electromagnetism. We introduce, in this paper our new eddy current imaging system for flaw detection in aluminium plate. The propose system using high current and low frequency with single coil. Results of some preliminary experiments have been shown satisfy sensitivities, resolution and stability of the proposed system.

A development of real-time fetal movement detector

Fetal Movement (FM) is a marker for evaluating wellbeing of the unborn baby. Naturally, pregnant women can sense any movement in her abdomen. However, there are two groups of women who may have degraded this sensing ability. A primigravida, a first time pregnant woman, may not be able to recognize the fetus movement. A working pregnant woman may be too busy to aware of her fetus responses. In this paper, a development of real-time fetus movement detector is presented. An air pressurized bag is designed to be wrapped around the abdomen of pregnant woman. It is connected to a pressure sensor in order to detect the force exerted against the uterus wall in any direction. The signal is processed before uploaded into internet cloud services for real-time monitoring and remote access.

Continuous non-invasive blood pressure monitoring based on applanation tonometry

The clinical demand for a device to continuous monitor blood pressure is on the increase to obtain diagnostic intensive information of the cardiovascular patients. The gold standard for continuous monitoring is invasive, direct method performed by inserting a catheter into the arteries. This article presents development of a low cost, non-invasive continuous blood pressure transducer based on applanation tonometry measured at external surface of the wrist. Preliminary testing with the blood pressure simulator has shown that the signal obtained from reported transducer visually correlated to the catheter type. Moreover applied to the healthy volunteers, continuation and consistent waveforms were also obtained.