TEMPERATURE AND VELOCITY FLOW-FIELDS MEASUREMENTS USING ULTRASONIC COMPUTER-TOMOGRAPHY

This paper presents a measurement method to determine the velocity flo w field and the temperature in a cross-section of an aerosol chamber b y means of the ultrasonic computer tomography. The required high measu rement resolution of the propagation time of the ultrasonic impulse th rough the medium is obtained by a special signal processing technique. Since the propagation direction of a sonic wave in a non-stationary m edium is not straight-lined, a ray linking procedure was developed tha t traces the rays. The combination of the precise propagation time mea surement, the ray linking method and a vector algebraic reconstruction technique leads to a computer tomographic measurement system for the determination of the temperature distribution and the velocity flow fi eld in a cross-section.