Underwater noise from human activities may have significant negative impacts on marine ecosystems through a variety of direct and indirect effects on marine organisms. We recommend as a priority the implementation of noise quieting technologies and the spatial and temporal exclusion of noise to minimize contact with marine life. As with other forms of pollution, reducing input at source is likely to be the most effective way of reducing impacts. New technologies are being developed for a number of activities which can substantially reduce noise inputs into the marine environment. Longer-term chronic impacts of noise including disturbance or masking of sounds critical for feeding and reproduction have received substantially less attention in management. Most current mitigation efforts are directed at reducing the risk of injury from exposure to intense noise, although the effectiveness of such mitigation measures in terms of risk reduction has rarely been quantified. The result has been efforts involving a variety of disciplines, and relevant legislation and associated guidance are now in place in many parts of the world. The issue has become a primary focus of marine mammal research, but is also of concern to the public and policy makers. Cable lengths of more than 30 meters not recommended.Over the last two decades, marine noise pollution has become increasingly recognized as an issue of major significance. Keep cable length between AS-1 and preamp, such as PA6, to a minimum for best performance. Please note that, with very long cables, output will be attenuated due to loading from cable capacitance. For longer cables, buy cable separately and leave notes on order form to verify preferred cable length. We can shorten this, but the price remains the same. OD = 25mm.Ĭable length is easily modified. ![]() Stainless Steel with rubber collet and plastic thumbscrew. Weight can also serve as a point to clamp flooded rubber tube for control of flow noise around hydrophone while towing. Placing mass on the cable (rather than on the hydrophone) minimizes acoustic reflections and minimizes the likelihood of damage to hydrophone when dropped. Assists in sinking the hydrophone and dampens vibrations in cable. Permanently installed, but can be moved up and down the length of cable and locked into desired position. Secured to cable with compression thumbscrew. Weight installed: 150-gram adjustable cable weight. No Weight: Hydrophone is close to neutral buoyancy. See User Manual and Charts for additional information. Aquarian Scientific attempts to represent its products fairly, but no guarantee of compliance is offered. Thus, any given AS-1-especially those with longer cable lengths-can deviate from the published specifications. ![]() Standard quality control allows for a +/- 3dB deviation of nominal sensitivity plus measurement error with compensation for cable attenuation. The preceding specifications were obtained from the average of a limited sample group and were measured at the end of 9-meter cable lengths. Weight (in air): 8g (plus cable 28g/m). ![]()
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