JW Fishers Sonar
Side Scan Sonar
Side scan sonars are one of the most sought-after and practical tools for underwater searches. The reason is that they can cover large areas quickly and “see” what’s on the bottom regardless of water visibility. A side scan finds things by sending out a beam that sweeps over the bottom, reflects off any object on the bottom, and returns to the towfish. The received signal is sent through the tow cable to a topside display. The displayed image is a highly detailed two-dimensional of the ocean, lake, river bottom and other objects. The sonar beam is transmitted and received by transducers mounted on each side of the towfish. How the transducer is constructed determines the frequency of the sonar beam. Side scans with low frequency have excellent long-range capability but low resolution at shorter ranges. High-frequency systems have higher resolution but a concise range. A dual frequency side scan has high and low low-frequencies in the same fish to give the best of both systems: long-range and highly detailed images at the shorter ranges.
SONAR VIEW software gives the operator complete control over operating parameters. Choose between 10 different scan ranges and 8 color schemes to display images. Connect a GPS, and position coordinates are automatically captured with the side scan data. Point the mouse on a target, and the GPS position coordinates for the target are displayed on the screen.
Sector Scanning Sonar
Sector Scanning sonar is an ideal tool for underwater search because it produces a “picture” of the underwater environment regardless of the water visibility. It does this by sending out a sound wave that reflects off objects on the bottom or in the water column. The reflected wave returns to the sonar head, where it is received and sent to the surface for display.
Fishers SCAN-650 is a high-performance scanning sonar system that can be mounted on an ROV, pole-mounted for use from a small
boat in shallow water, or mounted on a tripod. The scanning sonar serves as an obstacle avoidance system and provides target identification. The sonar beam sweeps in a 360-degree circle (or any portion of 360), allowing any object in the sonar “field of view” to be seen and displayed topside.
Sub Bottom Profiler
Sub Bottom Profilers (SBP) are used to identify the thickness of different strata layers below the ocean floor. Most importantly, for our application, it will also show any density disturbance within a strata layer. It’s the density disturbance we are after; it indicates something foreign within the strata layer. The SBP-1 has the advantage of being pole mountable for shallow water projects or boat towable (up to 1,000 feet of cable available).
Sub Bottom Profilers are one of the most effective tools used to identify and characterize layers of sediment or rock under the seafloor. The sub-bottom profiler is similar to that of a simple echo sounder. A transducer releases a sound pulse vertically downwards towards the seafloor, and a receiver records the return of the pulse once it has been reflected off the seafloor. Unlike a simple echo sounder, parts of the sound pulse will penetrate the seafloor and be reflected off of the different sub-bottom layers or strata layers. This will show any sort of density disturbance, which will indicate to the user that there is something foreign beneath the surface.