February 20, 2015
Subnero underwater acoustic recorder (aRecorder)
While our modems are designed to transmit and receive data, they also provide direct access to acoustic signals. A client had a need to simply record underwater sounds at scheduled times. While this could easily be done with the modem without any customization, there was also a need to increase the battery endurance and to sample signals from multiple broadband hydrophones. With these customizations, the Subnero aRecorder was born.
The Subnero aRecorder is a multi-hydrophone broadband data acquisition system designed for extended deployments in marine environments. It is designed to support 1 or more hydrophones with an aggregate sampling rate of up to 500kSa/s. The aRecorder comes with factory settable low pass and high pass filters. With the ability to schedule varying-duration deployments, aRecorder allows rapid environmental assessment where no previous data might have been available. it is designed for minimal manual intervention as well as ease of deployment & retrieval. Additional sensors such as GPS, depth sensors, compass etc. can easily be integrated to the system, catering to a variety of applications.
Key Features
- Multiple hydrophones
- Broadband
- Browser based user interface
- Ability to schedule varying-duration deployments
- Availability of a variety of optional sensors
Specifications
| Feature | Details |
|---|---|
| Hyrdrophones | up to 4 |
| Receiving sensitivity | -211±3 dB re 1 V/μPa |
| Horizontal directivity | Omnidirectional ±2dB at 100 kHz |
| Vertical directivity | 270° (±3 dB) at 100 kHz |
| Bandwidth | 1 Hz - 170 kHz |
| Sampling rate | 500 kSa/s (aggregate) |
| ADC | 16 bit |
| Storage | 128 GB (> 30 hours) |
| Battery | User replaceable, 15Ah, 18V (typical) |
| Battery endurance | >30 hours of continuous recording |
| >12 days of sleep (typical) | |
| External power | 110-230 V AC |
| Depth rating | 100 m (customizable) |
| Sensors | GPS, depth sensor, compass |
| Scheduled recordings | Multiple |
| User interface | Browser based |
| Communication interface | Ethernet |
