Rancang Bangun Sistem Pencitraan Menggunakan Gelombang Ultrasonik Dengan Metode Time of Flight

Abstract

Abstract

Research about imaging using ultrasonic wave with Time of Flight method has been carried out. This research purposed in defining image of underwater object surface. This system really worths to defining surface contour and also surface, leak and crack of pipe.

This system consists of ultrasonic pulse generator, stepper motor driver, and underwater imaging system application. Microcontroller used as pulse trigger on IC 74HC221. Obtained pulse then stabilizes by IC 74HC00. Afterward, pulse gets amplified by pulse amplifier, transistor 2N3906 and MOSFET IRF 840, as results, sensor could vibrate and produces ultrasonic wave. Time of flight could be determined by counting delay time while pulse emitted and received back. Received echo signal transducer amplified by Op-Amp LF356. It also compared by comparator LM339. Echo signal transfer by microcontroller to computer through serial communication RS-232.

Microcontroller output signals were amplified by transistor BD139 and TIP31 then stepper motor could be work. Data acquisition for depth carried out at 150 points at x-axis and 15 points at y-axis.

This system has been realized and could shows and save the results in 3D graphics format. Testing results of system showed imaging system has linear correlation value R=0,999 and SD=0,051.

Keywords : ultrasound wave, imaging and Time of Flight