Abstract Although Piezo-Electric Transducers (PZT) hydrophones are widely accepted and technologically mature in the field of Acoustic Emissions (AE) strain sensing underwater, optical fiber-based sensors gaining more attraction due to their multiplexing capability, small size, high resolution, sensitivity immunity Electromagnetic Interference (EMI). In this paper, we propose a hybrid Fiber Bra...

underwater acoustic wireless sensor network (uawsn) use acoustic signalsto transmit data. acoustic signals in underwater environment have high bit errorrate, long propagation delay and limited bandwidth. another constraint in uwasnis energy. due to these constraints, design of energy and bandwidth efficient andpropagation delay aware mac protocol is a great challenge in uwasn.underwater sensor ...

Automated target recognition is an important task in the littoral warfare domain, as distinguishing mundane objects from mines can be a matter of life and death. This initial work towards application convolutional autoencoding to sonar space, with goals disentangling reflection noise prevalent underwater acoustics allowing shape material targets. The autoencoders were trained on magnitude Fouri...

This paper is concerned with transparent boundary conditions (TBCs) for wide angle \parabolic" equations (WAPEs) in the application to underwater acoustics (assuming cylindrical symmetry). Existing discretiza-tions of these TBCs introduce slight numerical reeections at this artiicial boundary and also render the overall Crank{Nicolson nite diierence method only conditionally stable. Here, a nov...

Abstract New survey technologies are needed to untrawlable habitats in a cost-effective and nonlethal manner with minimal impacts on habitat nontarget species. Here, we test the efficacy of integrating data from suspended underwater camera acoustic generate population estimates for nearshore Black (Sebastes melanops), Blue mystinus), Deacon Rockfish diaconus). We surveyed Seal Rock Reef near Ne...

history of underwater diving dates back to antiquity. breath-hold technique in diving was known to the ancient nations. however, deep diving progressed only in the early decades of the 19 th century as the result of advancements in efficient underwater technologies which subsequently led to invention of sophisticated sets of scuba diving in the 20 th century. currently, diving is performed for ...

Climate-induced changes may be more substantial within the marine environment, where following ecological change is logistically difficult, and typically expensive. As marine animals tend to produce stereotyped, long-range signals, they are ideal for repeatable surveying. In this study we illustrate the potential for calling rates to be used as a tool for determining habitat quality. With a goo...

Climate-induced changes may be more substantial within the marine environment, where following ecological change is logistically difficult, and typically expensive. As marine animals tend to produce stereotyped, long-range signals, they are ideal for repeatable surveying. In this study we illustrate the potential for calling rates to be used as a tool for determining habitat quality by using an...

Discrete flow mapping was recently introduced as an efficient ray based method determining wave energy distributions in complex built up structures. Wave energy densities are transported along ray trajectories through polygonal mesh elements using a finite dimensional approximation of a ray transfer operator. In this way the method can be viewed as a smoothed ray tracing method defined over mes...