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Stereoscopic PIV is used to obtain the three-component velocity field in a planar region illuminated by a laser light sheet. Also known as 3D-PIV, the fundamental principle is stereoscopic imaging: two cameras view the illumination plane at different angles and a 3D calibration is used to extract the out-of-plane velocity component in addition to the two in-plane components. Stereo-PIV data reduction provides the true particle displacements and online 3-D velocity vector field display.
Since introducing the first commercial 2D-PIV system in 1988, TSI has led the way in PIV innovation and technology. A natural extension of 2D-PIV is Stereoscopic PIV, which provides the out-of-plane velocity component, in addition to the two in-plane components, upon the addition of a second camera. Stereoscopic PIV provides enhanced understanding of a flow relative to 2D-PIV because it offers insight into the three-dimensional structure within the illumination plane. TSI's Stereoscopic PIV systems maintains our strong PIV tradition by incorporating advanced analysis schemes in a robust hardware and software platform built for flexibility and expansion.
Upgrading from 2D-PIV to Stereoscopic PIV is easy and straightforward. The upgrade consists of a second camera and lens, Scheimpflug camera mounts (which allow for in-focus imaging from an angle), a dual-plane/dual-sided calibration target, and a software module. A stereoscopic PIV system can be a convenient stepping stone for upgrade towards a V3V volumetric PIV systems as well.
The MODULE-STRPIV package for INSIGHT™ 4G software provides data acquisition and processing capability for stereoscopic PIV. System calibration is performed quickly and reliably using a single image pair in forward-, back-, or side-scatter arrangements, and TSI’s Stereo-Automapping functionality corrects for target and laser plane misalignment, ensuring a high-quality calibration. Features such as grid deformation, the patented Hart and Rohaly-Hart correlation algorithms, and other algorithms from our exclusive license to MicroPIV technology such as ensemble correlation averaging and background correction, ensure the highest possible measurement accuracy even in sparsely seeded flows and flows with large spatial velocity gradients.
Stereoscopic PIV systems can be supplied in low-speed (several Hertz), mid-speed, and high-speed (even 10’s of kilohertz) forms, allowing the customer to achieve whatever temporal resolution is needed for their specific application. Please see TSI’s Time-Resolved PIV systems for additional details.
TSI has supplied Stereoscopic PIV systems for many applications, both traditional and unique. Some of the more interesting applications include large-scale wind tunnels (where TSI’s new Bubble Generator is invaluable), tow tanks (where remote camera control is a must), and index-of-refraction matched facilities.