Ultrasonic Velocity Measurements in Liquids

Abstract: With the advancement in the semiconductor technology and the need for compact instruments, most of the instrument designs are rapidly changing towards touch screen based, for better physical interaction. Touch screen based systems are very compact, light, easier to handle and provides lot of flexibility due to multiple graphic user interface panels. In the present work, we have designed a touch screen based sing around system in laboratory, using locally available components and two microcontroller ATmega32, as a master and PIC18f4550, as a slave. PIC 18F4550 is used to handle the generation of 2 MHz r.f. pulse, exciting the transmitting transducer, processing received signal from the receiving transducer and retriggering the transmitting transducer and in due course measuring the travel time at a given temperature. Resistive touch screen is used to design the interactive controls. Touch screen operations are controlled by the ATmega32. Necessary control panels for data acquisition, processing and display are designed as per our requirements. The designed system is tested for measurement of ultrasonics velocity in standard liquids at various temperatures. The measured values are in agreement with those reported in literature