ASL Environmental Sciences Inspection, Survey & Testing
Calibration testing tank
Two-part calibrate-and-verify process for AZFP echosounders in ASL's freshwater test tank.
Description
ASL calibrates and verifies AZFP scientific echosounders in its freshwater test tank. Calibrated instruments let researchers quantify observed backscatter on an absolute scale and compare backscatter across frequencies (dB differencing) for classification.
Key features
- Calibrate: a calibrated source, then a calibrated hydrophone, is aligned with the transducer at one meter range to characterize the receiver and transmitter
- Verify: a tungsten-carbide sphere is moved through each beam in a large freshwater tank
- Pass criterion: measured target strength within +/- 1 dB of theoretical
Applications
Scientific studies of spatial and temporal changes in acoustic backscatter from zooplankton, fish and suspended material.
More from ASL Environmental Sciences
- ASL Acoustic Zooplankton Fish Profiler (AZFP)
- ASL AZFP-nano and AZFP-pico
- ASL AZFP-ice
- ASL Ice Profiling Sonar (IPS)
- ASL Shallow Water Ice Profiler (SWIP)
- ASL Custom Mooring Frames and Cages
- Remote sensing services
- Ice studies
- Biological and hydroacoustic studies
- Physical oceanography, limnology and acoustics
- Numerical modeling
- Sediment transport studies
Featured services
All services →
Other service
Barge Towing Services
Inland and offshore barge towing and project cargo transport using owned push boats of 600 to 2200 HP plus chartered inland and ocean tugs.
Repair & Overhaul
Field Service, Spare Parts and Refurbishment
Worldwide repair, maintenance, inspection, certification, training, spare parts and complete refurbishment of Appleton Marine cranes and winches.
Other service
North Carolina Fisheries Association
Tradewinds
North Carolina Fisheries Association publication with columns from the chairman, executive director and director of government relations.