The Design Of Ultrasound Doppler Blood Flow Speed Detector With An USB Interface

This paper significantly discusses a blood flow speed detector with an USB interface that can communicate with the PC directly. The detector can make use of the conventional ultrasound Doppler shift signal to reflect the speed of flow. At present the ultrasound Doppler technical becomes one of the most important ways for doctors to diagnose the disease of blood vessel. As we all know blood corpuscle is the dispersion in the blood, so we can get the speed of the flood by them. When we want to know the speed of the blood we can calculate the speed of the blood corpuscle from the ultrasound Doppler expressions.The performance of the detector is not only lies on the detector's property, but also rests with the technique we disposing the signal. The main designer includes high frequency emission and receiving, disposure of analog signals, conversion between analog and digital signals, use of ARM, transmission of digital signals with USB, disposure of digital signals, frequency and data chart and so on. The disposure of forward analog signals contains signal magnifying, band pass filter, signal mixture, low pass filter and so on which can make the signal frequency more steadily and the value more suitable. While the disposure of digital signals such as FFT and weighted average algorithm can make the disposure faster and more accurate. There are also something about USB in this paper just like the control of the Program Flow Chat, the device driver exploitation and so on.Compare to the traditional huge and special device, the new one described in this paper uses the ARM as the MCU which contains an USB interface that can make the microchip communicate with the computer more speedily and neatly .So it is more smart, portable and also more cheap than the first one. This device can improve it's foundation by updating the software momentarily. It is smart, exact and can be used widely in the future.