SOLUTION SHEETPIV systems - planar measurements

Flexible, easy-to-use and high-performance PIV solutions

Solutions focused on flow-field measurements in space and time
Particle Imaging Velocimetry (PIV) systems allow non-intrusive measurements of twoor three velocity components for a planar cross-section in gas or liquid flows.
A system consists of one or two cameras, a light source, optics to create a light sheet, asynchronizer, a PC and software for analysis.
With a modular and flexible platform design combined with our wide range of components, systems can be tailored to fit many different applications. A single-camera system
can measure two velocity components (2C) in a plane (2D). A 2D-2C PIV system can be
upgraded to a Stereo PIV (2D-3C) system and even to a Volumetric Velocimetry (3D-3C)
system by adding components. For data acquisition and advanced flow analysis includingpressure from PIV, we have developed the most comprehensive imaging software for
optical velocity measurements - DynamicStudio.

Key benefits• Non-intrusive imaging technique for measurements of flow fields in gases and liquids• 2 or 3 velocity components in a plane can be measured• DynamicStudio has built-in tools and guides to simplify planning, set up and dataprocessing• The widest range of CCD, sCMOS and CMOS cameras. Up to 29MP and up to 25,600 fps
full resolution• Laser and camera combinations for repetition rates from 10 Hz up to 10KHz• Light-guide solution for flexible positioning of the light-sheet, even in space-limited
setups• ActiveTarget and ActiveTarget Traverse for fully automated spatical camera calibration• Semi-automatic camera sensor calibration• Programmable, automated data acquisition and traverse motion• Automated data analysis• Advanced timing and synchronization of any device in your experimental setup

High-end flow field velocity measurement solution
Particle Imaging Velocimetry (PIV) systems consist of one or two cameras(for 2D-2C or Stereo PIV respectively) with lenses, a light source (typicallya laser), optics to create a light sheet, a synchronization device, a PC forrecording, data storing, handling and analysis.
The light source and camera(s) are core components in a PIV system.
They must be selected based on the required temporal and spatial
measurement resolution. Thanks to the flexible platform-based design, asystem can be combined from a wide range of components and thereby
tailored to exactly match the specific needs of your application.

Overview of the different components,
timing and data flow.

Planar PIV solutions in brief
Configuration to measure two velocity components
A 2D-2C PIV configuration is a planar imaging system for measuring
two velocity components in a measurement plane defined by the lightsheet. A 2D-2C PIV system is compact and very easy to set up and use.
A system typically consists of a camera, a laser with light sheet optics, asynchronizer and a PC for data acquisition, storage and analysis. In orderto image the flow, seeding particles are also required (flow tracers). The
seeding can be small liquid droplets (for gases) or solid particles (for gasesand liquids).

Configuration to measure three velocity components
A 2D-2C configuration can easily be upgraded to a Stereo PIV (2D-3C)
system to measure all three velocity components in a plane by adding
a second camera. In a stereoscopic camera arrangement where theimaging is performed at an angle to the plane, the lens and image planeneed to be tilted in order to keep the measurement plane in focus. Thisis known as the Scheimpflug condition. A typical stereoscopic camera
arrangement and schematic of the imaging planes can be seen on thesidebar. Scheimpflug camera mounts are used to achieve this imaging
configuration.

DynamicStudio
The DynamicStudio software is very comprehensive and employs
a number of unique features for acquisition, synchronization, datapre-processing, post-processing, analysis and visualization. With ourpowerful software with multi CPU and GPU support for PIV, even online
visualization of flow fields is now possible. DynamicStudio is the central
element of your PIV system. To calculate the velocity fields from acquired
raw images and analyze the results, the DynamicStudio Base package
along with add-ons for 2D-2C and 2D-3C analysis are used.
The “Pressure from PIV” add-on allows for estimates pressure distribution
from given boundary conditions and velocity fields. See separate data
sheet for details.
With data acquisition and analysis performed in the same software, there
is no need to move data around. Interdisciplinary scientists can achieve
results quickly in the lab in order to focus on the research rather than themeasurements.
Page 2The Scheimpflug principle used in
Stereo PIV.

von Karman vortex street, Courtesy of
von Karman Institute, Brussels, Belgium.

Dedicated analysis routines and customized analysis sequences allow for quick
investigation and visualization of results. The software’s database structure is very
easy to use and includes extensive data exchange features e.g. to MATLAB® andTecplot. Data export in OpenFOAM® format allow for combining PIV, CFD and CAD
data and visualizing in e.g. ParaView®.
For further details on the software, see separate data sheet on the“DynamicStudio base package” on our website.

PIV vector field, CAD geometry andCFD simulation in OpenFOAM®.
Direct combined visualization using
ParaView®

Cameras, lenses and accessories
Dantec offers the widest range of CCD-, sCMOS or CMOS cameras to provide
the ideal solution for every fluid mechanic application; in total you can choose
from over 100 supported cameras. It is possible to “freeze” fast flows with up
to 25,600 frames per second (at 1 MP), or to resolve the smallest details with
the impressive resolution of a 29 MP camera.
To assure high quality images a semi-automatic camera calibration is includedin DynamicStudio. Select a lens to optimize the magnification and field-ofview (FoV) in order to fit the scope of the measurements. Narrow-band opticalfilters can be used to remove strong ambient light. For Stereo PIV and multicamera systems, Scheimpflug camera mounts are required.

A camera and lens fitted on a
Scheimpflug mount.

For further details on high-resolution and high-speed cameras, see separate
data sheets.

Illumination sources and accessories
To match the application requirements and camera specifications, a wide
range of illumination systems are available, including high energy and/or
high frequency pulsed lasers. Lasers for flow sampling rates from 10 Hz to
10 kHz can be selected to fit any application.

A laser with light-sheet optics.

Our modular light sheet optics allow for focal adjustments to place thethinnest part of the light sheet where needed and set the light sheet
divergence angle to match the camera FoV. Our light guide arms offer
flexible positioning of the light sheet even with large/heavy lasers.
For further details on lasers, light sheet optics and light guide arms, seeseparate data sheets.

Performance Synchronizer

Performance Synchronizer
The Performance Synchronizer ensures that all devices perform theirindividual tasks at the exact right time. The device is a powerful tool for
handling not only the PIV image acquisition, but also simultaneous
acquisition from other sensors and/or timing of external devices in theexperimental/industrial setup. Use of the ethernet interface makes it
possible to place the Performance Synchronizer near the experiment andthe PC in a control room at a distance.
Page 3

Guide in DynamicStudio shows how
to connect synchronization cables.

The Performance Synchronizer is integrated into DynamicStudio for easy
setup and configuration. Connected PIV devices are auto-detected, which
ensures that the user will not have to enter any specific properties for thesystem. The connectivity diagram in the software will display the way thesynchronization cables are to be connected.
In DynamicStudio it is also possible to create your own devices; thisflexibility ensures that you can connectauxiliary devices and handle themost challenging synchronization demands.
For further details on the possibilities and performance of this unit, seeseparate data sheet “Imaging Synchronizers”.

Predefined systems
Besides the freely configurable PIV systems where you can pick theideal components for your application, we also offer two preconfigured
PIV solutions. They offer great price/performance ratios for a variety ofapplications.

EduPIVThe EduPIV series consists of two complete preconfigured PIV system thatcomes not only with all components needed for PIV or Stereo PIV, but alsowith an entire flow loop. The system contains everything needed to startmeasuring right away. The EduPIV series uses an eye safe LED instead ofa laser, and it is targeted to training students or new staff in a small scale
flow experiment.

Options
ActiveTarget - for automated spatial camera calibrations
The ActiveTarget has embedded LED dots in a 20 x 20 array, size 200 x 200mm. Several targets can be combined to customize the target size andshape. With automatic target detection and encoding of LEDs positions thesoftware automatically acquire calibration images and creates calibrations
for all connected cameras. With ActiveTarget(s) mounted on the dedicatedwaterproof ActiveTarget Traverse, fully automated calibrations in waterand air can be performed. A software add-on is also available that allows
the use of a PC screen to be utilized as a target.
For further details see separate data sheet on “ActiveTarget”.

Traversing
A traversing mechanism for mapping different sections of the flow field canbe added to the system as an option and is controlled from the software toenable fully automated experiments.
The software can construct a complete time-averaged 3D-3C flow field bycombining 2D-3C data from each measurement section.

TrueTime laser pulse timing
The Performance Synchronizer can, as an option, be delivered with a special
feature for “TrueTime Laser pulse time stamping”. This allows for a precise(resolution of 1ns) recording of the time-between laser pulses in PIV for
increased velocity accuracy.

Encoder input for cyclic phenomena
With this option, the Performance Synchronizer can time stamp encoder
pulses in rotating systems such as engine, propeller and turbomachinery
applications.
Page 4

EduStereoPIV system, a complete LED
based PIV system incl. flow loop for
educational purposes.

Product overview
Flow sampling rate

10-15 Hz50-200 Hz

1 kHz

10 kHzApplication

Flow analysis

Flow analysis
Time resolved
measurements
in convection
flows andwater flows

Flow analysis
Time resolved
measurements
in high speed
water flows andlow to medium
speed air flows

Flow analysis
Time resolvedmeasurements
in high speed
air flows

Laser rep rate [Hz]10, 1550, 100, 200

1000

10000

Light Sheet Optics

Compatible with the laser beam diameter.
Adjustable focus and sheet divergence angle.
Compatible with Light Guide Arms.

Camera series

FlowSense EO

Camera accessories

Lenses, Filters, Scheimpflug mounts

SoftwareDynamicStudio: Base Package, 2D PIV Add-on, Stereoscopic PIV Add-on

Timing

Performance Synchronizer

PC / Workstations

Performance PC for 1-camera imaging system

FlowSense CX

SpeedSense
T xx40 series

SpeedSense
VEO xx10 		seriesHigh Performance Imaging PC for a 2-camera imaging system
Performance Imaging Streaming Workstation For 2-camera image
streaming
Illumination options

Light Guide Arm, 1 m or 2 m length

Timing options

TrueTime laser pulse time stamping
Encoder input (for cyclic synchronization, phase-resolved measurements)

Traverse options

1, 2 or 3- axis traversing mechanisms with up to 1010 mm range per axis

Preconfigured
systems

EduPIV: Eye-safe PIV solution including entire flow loop for training ofstudents, laboratory staff, new employees
FlexPIV: Versatile PIV solution for many applications in industry and research

Solution Sheet 0562_v9. Subject to change without notice. Copyright © 2022.
Dantec Dynamics. All Rights Reserved. www.dantecdynamics.com