Self-calibration performance in stereoscopic PIV acquired in a transonic wind tunnel

Journal Article · Wed Mar 16 00:00:00 EDT 2016 · Experiments in Fluids

DOI:https://doi.org/10.1007/s00348-016-2131-y· OSTI ID:1338388

Beresh, Steven J. ^[1]; Wagner, Justin L. ^[1]; Smith, Barton L. ^[2]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
2. Utah State Univ., Logan, UT (United States)

Three stereoscopic PIV experiments have been examined to test the effectiveness of self-calibration under varied circumstances. Furthermore, we our measurements taken in a streamwise plane yielded a robust self-calibration that returned common results regardless of the specific calibration procedure, but measurements in the crossplane exhibited substantial velocity bias errors whose nature was sensitive to the particulars of the self-calibration approach. Self-calibration is complicated by thick laser sheets and large stereoscopic camera angles and further exacerbated by small particle image diameters and high particle seeding density. In spite of the different answers obtained by varied self-calibrations, each implementation locked onto an apparently valid solution with small residual disparity and converged adjustment of the calibration plane. Thus, the convergence of self-calibration on a solution with small disparity is not sufficient to indicate negligible velocity error due to the stereo calibration.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1338388
• Report Number(s): SAND2016-12561J; 649876
• Journal Information: Experiments in Fluids, Vol. 57, Issue 4; ISSN 0723-4864
• Publisher: Springer
• Country of Publication: United States
• Language: English

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