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CALCULATION OF DETECTING DEPTH AND MOVING SPEED OF OBJECTS WITH CODED PULSES BASED ON SPEED CHANGES OF ULTRASOUND/SOUND
CALCULATION OF DETECTING DEPTH AND MOVING SPEED OF OBJECTS WITH CODED PULSES BASED ON SPEED CHANGES OF ULTRASOUND/SOUND
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机译:基于超声/声音速度变化的带编码脉冲的对象检测深度和运动速度的计算
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摘要
During transmission, a speed of ultrasound pulses gradually reduces due to their energy loss from acoustic impedance. A thickness and a density of piezoelectric (PZT) elements and a sound speed in the PZT elements decides energy of the ultrasound pulses and their detecting depth. A speed of moving objects and an angle of the moving objects with the ultrasound pulses may change a speed of reflected ultrasound pulses and affect their time of flight (TOF) and TOF shift. A method of Coding ultrasound pulses combines advantages of a continuous wave ultrasound and a pulsed wave ultrasound. So, it can be used to obtained the TOF and the TOF shift and calculate the depth and the moving speed of the detecting objects, which also avoids a problem of an aliasing for highly moving speed of the objects.
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