Dotted-line FLEET for two-component velocimetry

Journal Article · Tue Dec 21 00:00:00 EST 2021 · Optics Letters

DOI:https://doi.org/10.1364/ol.443750· OSTI ID:1841996

Zhang, Yibin ^[1]; Richardson, Daniel ^[2]; Marshall, Garrett ^[3]; Beresh, Steven J. ^[2]; Casper, Katya M. ^[2]

---

1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Advanced Systems & Transformation Center
2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Engineering Sciences Center
3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Engineering Sciences Center; Vanderbilt Univ., Nashville, TN (United States)

Femtosecond laser electronic excitation tagging (FLEET) is a powerful unseeded velocimetry technique typically used to measure one component of velocity along a line, or two or three components from a dot. In this Letter, we demonstrate a dotted-line FLEET technique which combines the dense profile capability of a line with the ability to perform two-component velocimetry with a single camera on a dot. Our set-up uses a single beam path to create multiple simultaneous spots, more than previously achieved in other FLEET spot configurations. We perform dotted-line FLEET measurements downstream of a highly turbulent, supersonic nitrogen free jet. Dotted-line FLEET is created by focusing light transmitted by a periodic mask with rectangular slits of 1.6 × 40 mm² and an edge-to-edge spacing of 0.5 mm, then focusing the imaged light at the measurement region. Up to seven symmetric dots spaced approximately 0.9 mm apart, with mean full-width at half maximum diameters between 150 and 350 µm, are simultaneously imaged. Both streamwise and radial velocities are computed and presented in this Letter.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE; USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0003525
• OSTI ID: 1841996
• Alternate ID(s): OSTI ID: 1845581
• Report Number(s): SAND2022-0044J; 702954
• Journal Information: Optics Letters, Journal Name: Optics Letters Journal Issue: 1 Vol. 47; ISSN 0146-9592
• Publisher: Optical Society of America (OSA)
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION