摘要：Among the pulse techniques in ultrasonics, sing around technique is widely used for measurements of ultrasonic velocity in liquids and solids. It is simple, versatile and highly accurate for absolute and relative ultrasonic velocity measurements. In the present work, an embedded sing around system, at operating frequency of 2 MHz, is designed around PIC 18F4550 microcontroller. Pulser and receiver circuits have been designed using locally available electronic components. Necessary controls have been dumped or embedded as software in the microcontroller to add intelligence to the sing around system. The designed system is compact, stand-alone, reliable, accurate and portable with onboard display of the ultrasonic velocity of propagation in the sample under study. Ultrasonic velocity measurements have been carried out in standard liquids and found to be in well agreement with the values reported in the literature.
关键词：pulse method; sing around technique; embedded system; PIC 18F4550; time of flight measurement; ultrasonic velocity; intelligent system
