Quantitative Schlieren Visualization.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
Pagination or Media Count:
A method to obtain quantitative information directly from a Schlieren image is investigated. Using the exact timed format of the video signal, the television raster is vertically scanned at a predetermined position and a sample point taken on each of the 525 horizontal lines. Using digital techniques, voltage displays corresponding to the black-white scene information are presented on an oscilloscope and plotted on an X-Y recorder. A single calibration curve gives relative sound pressure measurements. The results are compared for high frequency transmission and reflection from a thick steel plate. In addition, optimum optical arrangements and source configurations are discussed. Author