Light Field PIV System

Light Field PIV System

Light Field PIV System

Microvec’s light field volumetric PIV (LF-PIV) system can resolve 3D velocity fields through MART based reconstruction and 3D cross correlation. It offers an interesting alternative and affordable substitute to a Tomographic PIV. It is based on only one compact camera, avoiding the complexity of Tomographic PIV system setup. It is capable of measuring full volumetric velocity fields and allows accurate measurement of 3D velocity fields for applications with limited optical access.

 

Datasheet: HSI-Microvec_LightFieldPIV

Description

3D3C velocities in a single camera

MicrovechasdevelopedanewlightfieldvolumetricPIV(LF-PIV) system. Microvec LF-PIV can resolve 3D velocity fields through MART based reconstruction and 3D cross correlation. This new system can provide an interesting alternative and affordable substitutetoaTomographicPIV.Itisbasedononlyonecompactcamera,andcanbeusedtocalculate3D3Cvelocityinapplicationsand environments with space constraint.

In-house light field camera was developed according to plenoptic imaging where a customised micro-lens array (MLA) is precisely positioned one focal length away from the CCD of a 29 megapixel camera (See Figure 1 and 2). The MLA consists of 458×301 hexagonal lens unit, which maximises the pixel usage when compared to square lens unit. Light field image of tracer particle article can be simulated via linear Gaussian optics.

LF-PIV system pre-determines the location of a particle through inverse dense ray tracing (DRT) and reconstructs the voxel value using multiplicative algebraic reconstruction technique (MART).
DRT-MART technique implemented in Microvec LF-PIV achieves higher reconstruction resolution at much better computational efficiency than the MART method. To speed up the calculations even more, the system supports GPU and its parallel processing.