Temperature and velocity flow fields measurements using ultrasonic computer tomography

This paper presents a measurement method to determine the velocity flow field and the temperature in a cross-section of an aerosol chamber by means of the ultrasonic computer tomography. The required high measurement resolution of the propagation time of the ultrasonic impulse through the medium is obtained by a special signal processing technique. Since the propagation direction of a sonic wave in a non-stationary medium is not straight-lined, a ray linking procedure was developed that traces the rays. The combination of the precise propagation time measurement, 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 field in a cross-section.