Following up from the successful Imagenex Model 881 line of products, we came out with a new line in 2000: the Imagenex Model 881A family. By utilizing a fully fluid compensated transducer and motor housing, we were able to reduce the size of the units by almost half and reduce the power requirements by a factor of four. These improvements in size and power were made while retaining or even improving on the range and resolution performance of the Model 881 sonar family. One of the most innovative features of the Model 881A sonar family is the software programmable acoustic frequency range of 280 kHz to 1.1 MHz! This industry first is made possible by the combination of ingenious transducer design, advances in Digital Signal Processor (DSP) technology, and digitally controlled supporting electronics.
The Model 881A line of products is expanding rapidly. It currently includes an imaging sonar head, a profiling sonar head, and an echo sounder that can also be used as an altimeter. For full three dimensional mapping there is an Azimuth Drive version of the Model 881A.
Applications for the Model 881A sonar heads include almost all the uses found for the Model 881, and because of the improved power and size features, and the multi-frequency feature these units are found on many small inspection and exploration Remotely Operated Vehicles (ROVs).