In order to fulfill the requirements of an active magnetic bearing used for automotive application, two different inductive displacement sensor principles are evaluated. A basic test system is constructed in order to evaluate the sensor hardware. The results of the displacement measurement tested in a closed loop control operation are presented. Furthermore the test rig's performance is evaluated using two different control structures. A PID control and a state space control, by means of a Kalman Filter, are used.
The ultrasonic flow-meter made by the authors, measures the frequency shifts caused by the liquid flow, using two pairs of transducers mounted in a case attached to both ends of the pipe. In the original configuration the sound waves travel between the devices that are in line with the direction of the liquid flow. The speed of the signal traveling between the transducers increases or decreases with the direction of transmission and the velocity of the liquid being measured. The phase shift of received signals, caused by frequency shift is proportional to the liquid's velocity. The signals are processed with a microcontroller included on the embedded electronics board, the results being displayed on a LCD.
DACTEL is an EC funded Brite-Euram project (1996-1999), where different aspects of flip-chip technology development using adhesives were studied : adhesive development, dedicated test chip design and fabrication, electroless Ni/Au bumping of test chips, modelling, flip-chip technology development on different kinds of substrates : glass (FCOG), flex foil (FCOF), PCB (FCOB), ceramic materials (FCOC), and finally reliability testing of the developed technologies. The highlights of the different activities are presented in this paper.
