UB-Lab 3C - The velocity vector profiler


The UB-Lab 3C profiler measures accurate quasi-instantaneous co-located three (3C) components velocity profiles in the laboratory.


  • High spatial and temporal resolution
  • three components (3C) velocity profiles
  • Web interface

The compact and splash-proof (IP65) enclosure of the UB-Lab 3C is adapted to harsh environments. This scientific instrument can be used within a laboratory. It breaks new ground by offering the user new capabilities in the fields of turbulence study.

The device is configured through a dynamic web interface and integrates an internal logger (5 GB, representing more than 1 billion profiles), enabling hours of monitoring (depending on configuration).

Communication goes through Wifi (optional ethernet).

The UB-Lab 3C can be equipped with 1 emitting transducer and four receiving transducers. The multi-bistatic technique provides an instantaneous three component (3C) velocity vector measurement along a single beam (1D profile) at a high spatial and temporal resolution. This technique is also known as ADVP (Acoustic Doppler Velocity Profiler).

The emitter and four receivers are provided with the device, as well as the holder to ensure an optimal installation.

A 2C version may also be provided, with only one pair of receivers.

Compared to the previous "UB-Lab 2C", the hardware and software were upgraded to get a third component, a more user friendly interface and remove block size limitation for continuous acquisition at maximal sampling frequency.

This system has been validated by comparison with the ACVP of the LEGI (Grenoble, France) during an ANR MESURE project.

Measurement Performances UB-Lab 3C
Sampling range

5 to 300 mm at 1MHz

Number of cells 2 to 200
Cell size 2.2 to 20 mm
Velocity Range see Nyquist conditions.
Example of average velocity ranges for turbulence intensities of 8%:
  • +/-1.7m/s in front of 1MHz transducer to +/-1.2m/s at 43cm depth, with PRF=1500Hz.
Velocity accuracy 0.2 to 1%
Velocity resolution 0.1 ppm (floating point representation with 7 significant digits)
Sampling rates up to 64 Hz
Signal Processing Coherent Doppler with phase coding
Number of configurations 1
Measurement modus Bistatic Pulsed Coherent Doppler
Number of transducer connectors 5 (1 emitter and 4 receivers)
Type of transducer connectors lemo for FFA.00.250
Frequency range 1.0 MHz
Beam width 3.3° half angle
Emission voltage 50V

Electronics case: 174 x 116 x 56 mm

Transducers head: 209 x 93 x 93 mm

Weight 1.5 kg
Environment temperature

storage: 0-60°C

use: 0-45°C

Data Management
Communication HTTP through Wifi 802.11n (Ethernet optional)
Internal data logger 5 GB (more than 1 billion profiles)
File format binary raw data (extractible in ASCII CSV compatible with Excel, Matlab …)
Velocity Velocity profile data (relative to acoustic beam directions) per beam and cell
Echo Backscattered echo RMS amplitude per beam and cell
Data Quality Profile data quality indicator per beam and cell
Input 5V USB
Consumption Typical: 4W, Max: 7.5W
ON/OFF Button with LED indicator

A prototype of three-component velocity profiler deployed on a beach

A three-components ADVP was developed and deployed on a beach in Brittany, France, for sediment transport study ... read more


Morphology and dynamics of subaqueous dunes generated under unidirectional flow

A study on morphology and dynamics of subaqueous dunes done with a UB-Lab 2C (ADVP, bistatic) was presented at the Conference MARID AND RIVER DUNES VII ... read more

UB-Lab 2C - Sheet-flow

This video shows an example of setup for measurements in a sheet-flow condition in an open-channel flume with the UB-Lab 2C from UBERTONE.

UB-Lab 2C - benchmark measurement campaign presented in Madrid at HydroSenSoft 2019

In this paper, new data set of co-located 2C velocity and sediment concentration time-resolved measurements under steady uniform turbulent rough clear water and sheet-flow, performed with an Acoustic Concentration and Velocity Profiler (ACVP) and a prototype for a commercial ADVP, the UB-Lab 2C, are presented ... read more


2C-bistatic velocity profiling for turbulence measurements (follow-up) - M.E.S.U.R.E project

A big step has been taken for ultrasonic instrumentation thanks to the ANR Astrid-ASMA project M.E.S.U.R.E (Métrologie mES hydroacoUstiques opéRationnElles - Operational hydroacoustic SSC metrology)! First results on the measurement campaign in the laboratory facility of the LEGI ... read more

Transducers installation examples

You will find here examples of how to install transducers for measurements with the UB-Lab UVPs or the UB-Lab 2C from UBERTONE.

Accessories :