MiniShaker Aero
3D camera for volumetric flow field measurements
The MiniShaker Aero is an integrated multi-camera system with co-axial laser illumination of a conical measurement volume. It can be mounted to a robotic arm to retrieve the flow field in multiple sub-volumes of a large-scale flow field. The air flow measurement at multiple positions is based on a single initial calibration and LaVision’s Volume Self-Calibration. After the measurement, the sub-volumes are stitched together to a large common measurement volume. Particle tracks are binned onto a grid displaying time-averaged flow fields and turbulence statistics.
Data transfer and power supply are both provided by the USB 3.0 interface avoiding complicated cabling. For co-axial illumination, i.e. in the viewing direction of the cameras, the head is equipped with optics for conical illumination, and the light is conveniently delivered by an optical fiber. As seeding material, Helium-filled soap bubbles are highly recommended due to their 10000 times higher scattering intensity compared to 1µm fog seeding[1].
MiniShaker Aero models
The MiniShaker Aero is available in two designs: the MiniShaker Aero MP with multi-pulse laser support and the MiniShaker Aero TR for time-resolved measurement using high-speed lasers.
MiniShaker Aero MP is the tool of choice for 2-pulse Shake-the-Box measurements (high-density volumetric particle tracking) of flow velocities up to 50 m/s with a maximum recording rate of 50 fps in double-frame mode and a minimum interframe time of 81.5 µs. Two doublepulse lasers can be combined for 4-pulse Shake-the-Box for higher velocity accuracy and including acceleration measurements[2].
MiniShaker Aero TR is ideal for time-resolved Shake-the-Box measurements up to 10 m/s using a higher recording rate of 1000 Hz at a reduced sensor resolution and optics and fiber designed for high-speed lasers. Shake-the-Box strongly profits from long tracks reducing noise level and calculation time[3]. MiniShaker Aero TR also allows for double-pulse measurements at 250 Hz with a minimum interframe time of 91 µs sufficient for flow speeds up to 50 m/s.
Robotic support
With the new software modules Robot Control and Volume Stitching, measurements with robotic support are readily obtained. The robot position for each measured sub-volume is automatically stored, and all recorded sub-volumes are conveniently combined to a single large measurement volume of time-averaged flow fields. The software is designed such that a large range of robot models can be combined with a MiniShaker Aero system.
The MiniShaker Aero is usually connected by four M8 bolts on a circle of diameter 50 mm (left).
[1] More details in Caridi, Development and application of helium-filled soap bubbles: For large-scale PIV experiments in aerodynamics, PhD Thesis, TU Delft (2018)
[2] Novara et al., Multi-exposed recordings for 3D Lagrangian particle tracking in turbulent boundary layer flows by means of Multi-Pulse Shake-The-Box, 9th Int Symp on the Application of Laser Techniques to Fluid Mechanics (2018)
[3] Schanz et al., Shake-The-Box: Lagrangian particle tracking at high particle image densities Experiments in Fluids (2016)
General System Specifications
MiniShaker Aero TR
MiniShaker Aero MP
Digital output
8 bit or 10 bit
8 bit or 12 bit
Interface
4x USB 3.0, trigger connector, laser fiber for high-speed laser up to 30 mJ/pulse
4x USB 3.0, trigger connector, laser fiber for low-speed double pulse laser up to 50 mJ/pulse at 50 Hz
Number of cameras
4
Pixel size
4.8 µm x 4.8 µm
5.86 µm x 5.86 µm
Noise
10.9 e-
7 e-
Sensor size and speed
Single-frame mode:
1984x1264 px @ 121 fps & 10 bit,
896x656 px @ 510 fps & 10 bit,
704x358 px @ 1000 fps & 10 bit
Double-frame mode:
e.g. 896x656 px @ 255 Hz & 10 bit
Single-frame mode:
1920x1280 px @ 100 Hz & 12 bit,
1920x1280 px @ 155 Hz & 8 bit
1920x664 px @ 200 Hz & 12 bit
Double-frame mode:
1920x1280 @ 50 Hz & 12 bit
Minimum interframe time
91 µs
60.3 µs @ 8 bit
81.5 µs @ 12 bit
Lens mount
4x C-mount
Available lens caps
4 mm or 8 mm
8 mm or 12 mm
Power requirements
4x 3.9 W
4x 3.4 W
Cable lengths & bending radius
Camera: 4.7 m (4x USB, 1x lemo trigger connector); laser fiber: 9.7 m (other lengths upon request); Camera cabling and laser fiber surrounded by a cable protection conduit of 4.3 m length.; bending radius of cabling and fiber: 150 mm long term, 76 mm short term, no twisting
System requirements
MiniShaker with the selected lenses, DaVis software and packages, PC meeting current recommendations by LaVision, timing unit with trigger adapter, Windows 10 (64 bit), recommended: HFSB-seeding
Operating temperature
0 … 30 °C
Weight
ca. 2.5 kg without cabling
Dimensions (for 4 mm lens cap)
Width 135 mm, height 110 mm, length 319 mm, three mounting options of the wiring harness available
Quantum efficiency
Flexible measurement volumes
The following tables show available measurement volumes for different sets of lenses. Each volume is a cone with the focal plane in approximately 40 cm distance to the MiniShaker cameras, the measured volume cross section increases with the distance to the cameras.
MiniShaker Aero MP
focal length f = 8 mm
focal length f = 12 mm
AOI: 1390 x 1220 px
400 x 350 x 280 mm³
-
AOI: 1920 x 1280 px
-
360 x 240 x 90 mm³
MiniShaker Aero TR
focal length f = 4 mm
focal length f = 8 mm
AOI: 896 x 656 px
430 x 315 x 315 mm³
210 x 150 x 120 mm³
AOI: 1984 x 1264 px
-
460 x 300 x 200 mm³
LIF filters for suppression of background noise
Filters for suppressing the LIF signal of a Rhodamine coating are available. For the MiniShaker Aero MP and f = 12 mm lenses, these work on the full sensor, for f = 8 mm lenses they suppress the Rhodamine signal in the inner circle of diameter 1638 px. For the MiniShaker Aero TR and f = 4 mm lenses, the filters work for a circle of diameter 1000 px and for f = 8 mm lenses for a diameter of 2000 px.
In application
A racing bike experiment was performed at TU Delft, stitching the measurements in multiple subvolumes to the total flow field of interest. The MiniShaker S combined with a robotic arm recorded velocity fields even in secluded volumes surrounded by the complex shape of a human-sized mannequin.
Ordering information
Part number Description
Hardware
1101570
MiniShaker Aero TR with f = 4 mm lens cap, standard cable lengths, adapter to UR5/10 robot
1101571
MiniShaker Aero TR with f = 8 mm lens cap, standard cable lengths, adapter to UR5/10 robot
1103273
High-speed laser Nd:YLF, dual head, 30 mJ/pulse
1108386
High-speed laser fiber coupler compatible with MiniShaker Aero TR
1101572
MiniShaker Aero MP with f = 8 mm lens cap, standard cable lengths, adapter to UR5/10 robot
1101573
MiniShaker Aero MP with f = 12 mm lens cap, standard cable lengths, adapter to UR5/10 robot
1103299
Nd:YAG double-cavity laser, pulse energy 2 x 50 mJ
1108355
Fiber coupler compatible with MiniShaker Aero MP
Accessories
1108994
Set of calibration plates
4x1109805
Set of four camera filters optimized for 527 nm wavelength and blocking anti-reflection LIF signals (LIF paint not included)
1108890
High-speed laser beam dump
1108891
Low-speed laser beam dump (max. average power 50 W)
1101543
PC interface card for connection of MiniShaker to internal PTU X
1101542
Interface adapter for connection of MiniShaker to external PTU X
1101580
10 m cable extension from MiniShaker to system PC (drag-chain applicable): USB andtrigger cable extensions and USB interface card for power supply of USB cables (to be built into system PC)
1101581
20 m cable extension from MiniShaker to system PC
1101540
UR 5 teachable robot, 6 joints, position repeatability ±0.1mm, 5 kg load
1101548
UR 10 teachable robot, 6 joints, position repeatability ±0.1mm, 10 kg load
1101583
15 m cable extension between robot arm and robot control box for robot UR 5
1101584
15 m cable extension between robot arm and robot control box for robot UR 10
See separate LaVision data sheets for internal or external PTU X, lasers, laser beam dumps and Helium-filled soap bubble seeding.
Part number Description
Software
1105320 &
1105075
DaVis 10 software module & Shake-the-Box software module
1105072
Robot Control software module: definition of measurement positions, execution of measurement plan synchronized to image recording by DaVis, incorporates the robot in the DaVis device configuration, adds coordinates to the recorded images
1105073
Volume Stitching software module: combining Shake-the-Box tracks recorded at multiple sub-volume to a single large volume, conversion to a grid for time-averaged volumetric flow fields
1105078
Pressure from PIV software module for pressure calculation from PIV and PTV data
商品属性 [Pixel Size] 5.86 µm x 5.86 µm