New Line of Cost Effective Underwater Acoustic Recorders from Abyssens

Abyssens showcases the latest technology for passive acoustic monitoring: DORI. This line of underwater acoustic recorders has high acoustic performance with more than 110 dB of dynamic range, listening up to 200 kHz and with a maximum storage capacity up to 16 TB.

DORI is a modular line of underwater acoustic recorders. DORI recorders are made for deployments at sea for short listening sessions of about 15 days (for the S model), 3 months (for the M model) to long-term monitoring of about 6 months (for the L model) of continuous recording.

One model, the XS version, is specially dedicated to complement other platforms. This model is powered by an external source and does not have an internal battery. It is thought to be integrated aboard vehicles such as ROV, AUV or gliders thanks to its very small size. It can also be used as a wired observatory.

All models record 24 bits raw-data on .wav format and have a high dynamic range of 110 dB that can be adjusted thanks to software configurable analog amplification gains. A software selectable analog high pass filter can help for high energy sites.

(Image credit: Abyssens)

Thanks to a self-noise below sea state zero and a high dynamic range, ambient noise can be monitored together with high level sources.

The hydrophone is either integrated directly into the recorder or external.

The target frequency range is divided into two categories for all models: Low Frequency (up to 30 kHz with an HTI96 MIN Low Noise hydrophone) and High Frequency (up to 200 kHz with an HTI99UHF hydrophone). The low frequency version is commonly used to monitor ambient noise, vocalizations of marine mammals, noise from ships or sea works. In addition to these previous applications, the high frequency version allows the detection of clicks from marine mammals, including harbor porpoise with a dedicated and optimized sampling rate of 360 ksps.

The storage capacity is in line with the autonomy of each model and therefore goes up to 16 TB for the largest.

An optional external temperature sensor is available for all models.

An online configurator called “How to choose my underwater acoustic recorder” is available here.

Key specifications

• Raw data storage (.wav) on 24 bits
• High dynamic range: 110 dB
• High storage capacity up to 16 TB
• 3 power approaches: externally powered, internal UN38.3 air transportable rechargeable battery or alkaline C or D cells
• Clean and secure access to SD cards and energy (without contact with electronics)
• Configuration over WiFi (without opening the recorder)
• Software configurable analog amplification gain and high pass filter

For more information, visit: www.abyssens.fr