Autonomous Recorders - HARPs and ARPs
       To monitor marine mammals and study ambient ocean noise over long periods, our group has developed autonomous acoustic recording devices in a number of different configurations for various marine environments. These devices are commonly referred to as HARPs (High-frequency Acoustic Recording Package) and the previous, less capable ARPs.

HARPs are composed of three main components:
       - High Sample Rate Data Acquisition System
       - Broad-band, High Sensitivity, Low Self-noise, Hydrophone Sensor
       - Instrument Packaging
 
       The acoustic data provided by our HARPs and ARPs are central to many of our projects including studies from Antarctica to Alaska on a wide range of topics from ocean ambient noise to low-frequency baleen whale calls and high-frequency dolphin clicks, and the various sound in between such as anthropogenic sounds from ships, sonar, and seismic exploration.
Blue whale calls (above) and beaked whale call (below).
       Typically, these data sets are large (~ 2 TB/deployment) and specialized software has been developed to process, view and analyze these long time series. The acoustic analysis software package is called Triton and was developed in MATLAB.
Credit: Sean Wiggins