SOFTWARE

The Stereo PIV system is based on 2D PIV but adapts principles of stereoscopic imaging to enable computation in the third dimension. At least one set of two synchronized cameras view the object from different angles, producing two sets of 2D velocity vector components. The third velocity component is derived within the test from the two data sets. The images must be calibrated to enable evaluation of the Z velocity component.

Standard Components:

❖ 2x CCD camera with a lens and a frame grabber
❖ PIV Laser
❖ Synchronizer (8 channel TTL control)
❖ MicroVec 3D PIV Software
❖ MicroVec PIV Image Capture Module
❖ Patented Scheimpflug Adapter or Tilt/Shift lenses
❖ 3D PIV Calibration Kit

Applications:

❖ Wind/Water tunnels
❖ Aerospace/Aeronautics
❖ Compressors, Turbines, Fans, Pumps, Sprays
❖ 3D Vortex Flow
❖ Microelectromechanical Systems (MEMS)

AI PIV is a new innovative technology from Microvec. With the latest advances in deep learning techniques based on neural networks in the machine vision field, PIV methods based on deep learning have proved to be very accurate. Our PIV is based on the optical flow neural network proven in the computer vision community. It has been successfully applied in fluid mechanics and particle image velocimetry where global and quantitative velocity field can be evaluated with computational efficiency with no loss of accuracy.

Advantages:

❖ Faster computation time compared to traditional PIV methods (almost real-time computation)
❖ The accuracy extends to maximum single-pixel calculations, where it is one order of magnitude higher than cross correlation evaluations
❖ Dense vector fields obtained faster
❖ Not necessary to use all currently used post-processing techniques
❖ Easy to use

Image: Cross-correlation PIV result + detailed view of jet flow

Tomographic PIV is a volumetric velocimetry technique which makes use of imaging sections of the measurement volume. Then, the images of tracing particles are reconstructed in the sections of the measurement volume and volume correlation takes place. Full velocity and velocity gradient tensor fields can be evaluated, which provides valuable quantitative information on complex three-dimensional flows like turbulent flow, 3D vortex flows. Our PIV offers 4 different algorithms for evaluating tomographic PIV including patented Intensity Enhanced MART.

Standard setup:

Image: Standard setup

Basic microscopic PIV system that is easy to operate and integrate, designed for research centers and universities. Works with small fields (from 1 to 200 mm) with a spatial resolution of a micron and a flow speed of up to 0.3 m/s. It may also be used to acquire high-speed images of over 100 frames per second. The system uses macro lenses or integrates directly with a microscope.

Standard Components:

❖ Mini DPSS laser
❖ Double pulse PIV lasers
❖ CCD cameras (VGA to 9 MP)
❖ Synchronizer
❖ MicroVec PIV Image Capture Module
❖ MicroVec 2D PIV Software
❖ Macro lenses or microscope
❖ Laser light guiding arm or fibre optic liquid light guide
❖ Adapters to connect microscope and lasers

Applications:

❖ Microfluidic Devices
❖ Nozzles/Liquid Jets
❖ Microscale deformations and Strains
❖ Particle analysis
❖ Micro Channels

Image: Flow characterization in 200 micrometer microchannel model

Calculating pressure accurately using Particle Image Velocimetry (PIV) has been a goal for researchers for some time. A non-intrusive, high resolution technique could bring a scientific breakthrough and replace pressure transducers with low spatial resolution.

An increasing number of papers has been published on this topic over the last years and new methods of calculating pressure have been proposed. The core idea is to solve the momentum equation to obtain pressure based on computing the pressure gradient from the velocity data. In short, the first step is to acquire PIV velocity data to determine acceleration. The second step lies in extracting the pressure gradient from the velocity data and last is the computation of the pressure field based on spatial integration of the pressure gradient from a reference point, normally at a corner of the measurement.

Microvec has implemented a software module to enable computation of pressure distribution in its PIV software. The computation uses a novel method called Irrotational Correction on Pressure Gradient (patent pending) that is unique and greatly improves the pressure reconstruction.

Determining pressure in a vortex ring impacting a wall

Image: Flow visualization using dye

Image: Velocity field

Image: Pressure field

Time Resolved PIV (TR PIV) is based on capturing images at a very fast rate (typically hundreds or thousands of frames per second) using high-speed cameras. Images are captured at a series of time intervals and the velocity information is extracted based on time between the frames.

AMEE TR PIV offers two types of TR PIV Systems:
❖ Systems for flow speeds below 1 m/s (high-speed camera and a DPSS laser)
❖ Systems for flow speeds above 1 m/s (high-speed camera and a high frequency PIV laser)

Standard Components:

❖ High-speed camera (high-resolution cameras up to 1000 fps, low-resolution cameras up to 16 000 fps)
❖ High frequency double pulse PIV laser
❖ Synchronizer
❖ MicroVec PIV software

Applications:

❖ Wind/Water Tunnels
❖ Aerospace/Aeronautics
❖ Compressors, Turbines, Fans, Pumps, Sprays
❖ Chemical Mixing Equipment
❖ Microelectromechanical systems (MEMS)