Ice Profiler
Wave Profiler
Water Column Profiler
IRIS- Imagenex Datalogger
ASFM - Open Channel
Bottom Frames
WERA HF Radar
Shallow Water Ice Profiler
Acoustic Scintillation Flow Meter

Key Projects

Surface Buoy Mounted Configuration

The ASL Acoustic Water Column Profiler offers a new, inexpensive way of obtaining reliable measures of marine environmental conditions in the water column. The Acoustic Water Column Profiler can monitor the presence and location of zooplankton within the water column by measuring acoustic backscatter returns with ultrasonic frequencies. Other sonar targets realizable from the sonar backscatter data include fish and sediments.

Using onboard data storage, the Acoustic Water Column Profiler can collect data continuously for periods of up to several months and can be operated in a upward looking orientation from the sea-bed or a subsurface mooring or in a downward looking mode from a surface buoy.

Acoustic Performance

Click here to view specifications table

Side lobes are -17 dB at least

Limits of detectable volume strength are within +/- 3 to 4 dB

Gain settings allow the adjustment of the detectable range up or down by about 12 dB

The time-varying gain range is 80 dB

The above specifications are subject to change without prior notice.

TILT SENSOR (for sonar beam angle):

• Range: +/- 20 deg.
• Accuracy: +/- 0.1 deg.
• Precision: 0.01 deg.

DATA STORAGE:

• Standard: 4GB flash card (up to 8 GB flash) .

Internal Recording Version Subsurface Moored

POWER:

• Standard: Provides 20 weeks operation at 1Hz sampling and 100% duty cycle.
• Option A: Provides 40 weeks operation at 1Hz sampling and 100% duty cycle.
• Option B: Provides 4 weeks operation at 1Hz sampling and 100% duty cycle.

SIZE:

• 0.17m diameter x 1.0m length

SHIPPING WEIGHT:

• 50kg (in ruggedized aluminium shipping/storage case)

Example

See below, data collected over 9 days showing diurnal migration of zooplankton during the deployment of the instrument on a test buoy in Saanich Inlet, BC, Canada.

Brochure

For further information on; Applications, Features, Specifications and Options . . . view and print our brochure (536 kb ~ PDF file format ~ 2 pages)