Difference between revisions of "MHK ISDB/Instruments/Nortek Acoustic Doppler Velocimeter"

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|Application=For use in a laboratory environment. Takes point measurements of velocity, either in beam or XYZ coordinates. Good for capturing small-scale motion. Best when used in conjunction with an automated gantry system.  
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|Application=For use in a laboratory environment. Takes point measurements of velocity, either in beam or XYZ coordinates. Good for capturing small-scale motion. Best when used in conjunction with an automated gantry system.
 
 
 
|Pros=High sampling rate. Three dimensional velocity data. Instrument provides a large amount of helpful meta data.
 
|Pros=High sampling rate. Three dimensional velocity data. Instrument provides a large amount of helpful meta data.
 
|Cons=Data quality is highly dependent on seed particles. Data must be filtered to eliminate poor quality readings due to phase wrapping and/or acoustic interference. Possible flow interference from the instrument head skews readings at the 'top' of the velocity profile.  Very fine bin sizes (1 mm) result in lower quality data.  A low signal to noise ratio at measurement points farthest from the transducer head can cause spiky data.
 
|Cons=Data quality is highly dependent on seed particles. Data must be filtered to eliminate poor quality readings due to phase wrapping and/or acoustic interference. Possible flow interference from the instrument head skews readings at the 'top' of the velocity profile.  Very fine bin sizes (1 mm) result in lower quality data.  A low signal to noise ratio at measurement points farthest from the transducer head can cause spiky data.
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|SubmittedOn=06/21/2016
 
|SubmittedOn=06/21/2016
 
|Timestamp=20160621153907
 
|Timestamp=20160621153907
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|Application=I have used Nortek Vector probes in the lab & field and Vectrino probes in the lab. The field testing involved towing the instrument through a lake. The lab testing utilized the probes (mounted stationary) in a recirculating flume. In all cases, the instruments were used to measure flow speed with the intention of characterizing turbulent conditions in the flow with high temporal resolution (sampling at highest rate available). Additionally, the Vector probe was used to monitor physical orientation of the vessel it was mounted to.
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|Pros=The probes are easy to mount (especially in the case of the cabled head versions, which are highly recommended). Measurements are output in a straight-forward to extract format. They also provide indicators of data quality (e.g., beam correlation) that is useful for QA. The measurement capability into the inertial subrange of turbulence is quite useful. The ability to synchronize measurements from multiple Vectrino probes is a plus.
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|Cons=There is an issue of slight clock drift with the Vector probe. The instrument must be synchronized with a computer clock before every set of measurements to minimize this issue. It would be nice to be able to interface with the instrument directly through serial coms out of the box without needing to work through Nortek’s software interface.
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|EaseOfUse=These instruments are very easy to configure, mount, and deploy.
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|Software=I typically QA and post process data from these instruments in Matlab. Nortek’s software allows exporting the data in .mat format.
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|Recommendations=Always check the Nortek forums for answers to common questions. There is a large user base for these instruments and the forums are active.
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|SubmittedOn=06/21/2016
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|Timestamp=20160621154904
 
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Latest revision as of 14:50, 21 June 2016

Nortek Acoustic Doppler Velocimeter

Manufacturer: NortekUSA
Measurement Category: Oceanographic
Operating Environment: Underwater
Version(s): Vector: Field, Vectrino: Lab
Communication Protocol: RS-232, RS-422, Voltage
Operating Mode: Free Streaming
Power Supply Type: Battery, VDC
Power Specification: 9-18 VDC, Internal Battery
External Input: 2 Analog, 0-5 V, 16 bit A/D

Description

The Vector is a field instrument designed for measurements of rapid small scale changes in 3D velocity, used for turbulence, boundary layer measurements, surf zone measurements, and measurements in very low flow areas. The Vectrino is the lab version.


Instrument Measurements

  • 3D Velocity Point Measurement (Current)
  • Temperature (Water)

Measurement Specifications
See spec sheet for additonal sensor details.


Optional Sensors

No optional sensors provided. Please add sensors.


Notes, Considerations & Recommendations

One analog output for each velocity component, or two velocities and pressure. Available with optional motion sensor.


User Experience

Contribute your experience








 
Nortek Acoustic Doppler Velocimeter: User Experience Report


 
Nortek Acoustic Doppler Velocimeter: User Experience Report