We present what is, to our knowledge, the first instantaneous optical tomographic reconstruction of a nonstationary fluid flow. Holographic interferometry is used to measure optical path length through a coflowing helium jet in air along several views. The spatial distribution of the helium concentration is determined from these measurements. Eighteen views through a 7-cm-diameter, 7-cm-high cylindrical volume are recorded, yielding a spatial resolution of 3 mm with an error of less that 3%. When a 1-W argon-ion laser is used, the temporal resolution is 300 μsec.
© 1988 Optical Society of America
Original Manuscript: August 24, 1987
Manuscript Accepted: November 13, 1987
Published: February 1, 1988
Ray Snyder and Lambertus Hesselink, "Measurement of mixing fluid flows with optical tomography," Opt. Lett. 13, 87-89 (1988)