Survey Systems
Williamson & Associates has the systems, personnel and proven techniques to meet the requirements of any seafloor investigation.
New Technologies
The PROSAS Surveyor PS175 is a 175 kHz Synthetic Aperture Sonar system (SAS) currently mounted on a MacArtney Focus-2 ROTV with an operating depth of up to 400 meters at 5 knots. This survey platform provides seafloor imagery at a constant resolution of 3 cm by 3 cm at ranges out to 200 meters each side. The system also produces real-time swath bathymetry.
Download PROSAS PS175 specifications.
The PROSAS Surveyor PS60 is a 60 kHz Synthetic Aperture Sonar system (SAS) capable of operating in water depths to 6,000 meters. The system was constructed by SL Hydrospheric in a joint venture with Williamson & Associates. This new survey platform provides seafloor imagery at a constant resolution of 10 cm by 10 cm at ranges out to 1,500 meters each side. The system also produces real-time swath bathymetry. Future upgrades will include Chirp Subbottom Profiler, Multi-beam Echosounder for bathymetric gap fill, rearward looking sonar for image gap fill and continued improvements to the SAS processing and hardware.
Download PROSAS PS60 specifications.
The AMS 60 is a deep seafloor mapping system capable of generating co-registered imagery, bathymetry and subbottom profiles profiles across a swath of up to 2500 meters (8000 feet). The AMS 60 is a general purpose system, allowing both wide swath mapping and high-resolution target imaging. The swath bathymetric mapping capability allows seafloor bathymetry maps to be made at 2 meter contour intervals.
Download AMS 60 specifications.
C-BASS is a seafloor towed survey system that is used to collect high resolution geophysical and geotechnical information for the top 3-5 meters of seafloor sediments in water depths to 2,000 m. Using resistivity and induced polarization, C-BASS is used to determine the burial feasibility and other characteristics for planning, design and route selection of seafloor cable and pipeline installations and to characterize mineral deposits.
Download C-BASS / C-CASS specifications.
C-CASS is a special purpose dipping instrumentation platform, created to provide enhanced bottom and water column assessment during a geophysical survey at a lower cost than conventional ROV’s while not unduly limiting mobility, operating from winches and gear already in use with other survey equipment. C-CASS is lowered to the bottom of the seafloor on an electro-mechanical cable, utilizing its data acquisition subsystems: a high frequency scanning sonar, video, and depth meter. C-CASS operates from vessels-of-opportunity using standard handling equipment and deep sea coaxial cables. Although comprehensive, the list of sensors and subsystems can be changed based on the needs of the operation.
Download C-CASS specifications.
The CPTV (cone penetrometer test and vibrocorer) is a remotely operated geotechnical testing and sampling tool for use in water depths to 2,000 meters. The CPTV allows both in situ CPT data collection to a depth of 5 meters as well as 2-3 meter core sample retrieval for on board ground-truthing or laboratory testing.
Download CPT specifications.
REDAS is used to complement conventional geophysical surveying techniques to provide an improved prediction of the geotechnical characteristics of the top few meters of seafloor sediments. The REDAS implements direct current electrical resistivity while being towed in contact with the bottom at 1-2 knots. REDAS is designed to operate from vessels of opportunity using standard handling equipment and deep sea coaxial cables.
Download REDAS specifications.