S. Kausinis

Bio: S. Kausinis is an academic researcher from Kaunas University of Technology. The author has contributed to research in topics: Flow measurement & Flow velocity. The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Simultaneous measurements of dynamic values using the transit time method

Abstract: The problem of simultaneous and accurate measurements of two dynamic values, time dependencies of flow velocity and ultrasound velocity in the flow, is analyzed. In order to measure two dynamic values simultaneously a theory of the transit time method has developed, and the theoretical model of a microprocessor-based measuring system has been derived. The ways to improve the accuracy and information of such dual-channel measurement systems have been examined. It is shown that invariance between two channels of a measurement system can be achieved when dynamic, nonlinear, parametric models of these channels are identified in real time during the process of measurement, and when the multipulse irradiation of flow is used. The results of computer simulation of transit time method dynamic errors are represented. A method of minimizing these errors has been proposed. >

Triangular cross section duct for ultrasonic flow rate measurement

Abstract: Liquid flow measurements are widely used to control cooling and heating systems. Flow sensor systems based on ultrasonic time-of-flight technology provide a reliable, rugged, and easy to integrate solution. Most important, ultrasound is also a cost – effective long term solution for flow problems. Short ultrasonic wave pulses [1, 2] and the time-of-flight method are used for probing of the liquid. The flowing liquid causes time differences, frequency variations and phase shifts in ultrasonic signals, which are subsequently digitally evaluated by a flow meter electronics. The principle behind the measurement is that sound waves traveling with the flow of liquid will travel faster than those traveling against it. The difference in the time-of-flight of the signals is an indication for the flow rate of the fluid. Most flow meters are designed to measure a flow that follows a certain flow velocity profile. The exact behavior of the velocity profile will depend on many factors such as meter installation effects [4, 5], inlet pipe wall roughness [6], flow rate and viscosity of the fluid [7].

New non-invasive method and system for intracranial pressure waves' measurement

Abstract: Invasive intracranial pressure (ICP) sensors are potentially dangerous for neurosurgical patients. The problem of non-invasive ICP monitoring is analyzed, the new non-invasive method and technique in accordance with the developed ultrasonic transit time method is proposed and a computer based ICP waves' measuring system is introduced. The resolution of this system is less then 0.1 mmHg and the measuring channel's capacity is above 1.0 kbit/s which allows one to resolve up to 11 harmonics of ICP pulse waves. The results of clinical tests and simultaneous comparative analysis of invasive and non-invasive ICP measuring systems' data are shown and discussed.