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Pulsed Wave Velocimetry (PWV) is an ultrasonic technique for measuring velocity profiles in flowing liquids. With an earlier prototype, we already demonstrated its applicability to monitor the flow behavior of molten polypropylene with different additives in capillary dies. In this contribution, we present an improved measurement setup, which allows testing liquids with temperatures > 220°C using...
A new low-cost pulse based ultra-wideband radar system working up to 6.4 GHz has been developed. The main focus was on the use of cheap off the shelf components. Pulse generation in the transmitter was solved with a simple transistor circuitry. In the receiver the down conversion is realized with a sampling phase detector combined with a direct digital synthesizer. To control the radar system and...
Ultra wideband radio, especially impulse radio demands extremely high accuracy in pulse synchronization. A synchronization algorithm for picosecond pulse positioning is proposed with a complete analog correlation receiver. A transmitter for the two different time and amplitude modulation schemes is presented. Solutions for extending the receiver to multi user features by software can solve the problems...
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