PIV Measurement of velocity and acceleration fields using multi-pulse technology

PIV is extended to the measurement of simultaneous acceleration and velocity fields by the addition of a small number of light pulses. We begin by considering triple-pulse and quadruple-pulse systems, and discuss the optimization of the pulse locations for various measurements. Third-order correlation techniques are applied to the triple-pulse images, yielding significantly improved correlation detectability. Results from experiments in steady flows of know acceleration are used to assess the accuracy and performance.