In the conventional pulsed doppler system, a gated sinusoidal signal is used to excite a ultrasonic array transducer so that a group of linear R.F. amplifiers are required.
But high voltage-linear R.F. amplifiers are not easy to realize, and the system becomes bulky because a number of power amplifiers requires. To avoid these difficulties, a pulsed doppler system, which excites the transducer impulsively, is studied theoretically and experimentally.
In this paper, the experimental pulsed doppler system is implemented which uses quadrature detection in order to detect the forwarding and receding flow of the object.
The experimental results agree well with the simulation results. The effect of attenuation was also examined by computer simulation. In conclusion, the designed pulsed doppler system shows the possibility of the system experimentally.
