Erwin Reichel, Bernhard Zagar,
"Characterization of Ultrasonic Sources Using Schlieren and Phase-Contrast Methods"
, in Transactions on Systems, Signals and Devices, Vol. 4, Nummer 4, Seite(n) 497-506, 2009, ISSN: 1861-5252
Original Titel:
Characterization of Ultrasonic Sources Using Schlieren and Phase-Contrast Methods
Sprache des Titels:
Englisch
Original Kurzfassung:
To rapidly characterize ultrasonic sources with power levels in the
medical diagnostic range optical measurement techniques provide an
alternative to time consuming hydrophone measurements. In this paper,
the concept of schlieren photography is extended to a highly flexible
solution by using a spatial light modulator as a replacement for the
schlieren stop. By using short laser pulses as the light source,
synchronized to the ultrasonic source, high quality images of the
actual acoustic waves are acquired. The optical system is modeled by
means of Fourier optics, a demonstrator setup and measurement results
are presented.