NAUTA scientific

instruments for science

RASP


Registratore Acustico Subacqueo Programmabile

Programmable Underwater Acoustic Recorder


A simple instrument, for underwater acoustic monitoring, with quality and low price.
Suitable to monitor the acoustic environment from nets to conservation hot-spots, Marine Protected Areas, off-shore operations, RASPs offer a simple instrument than can be deployed and recovered from a RIB (see our sample deployment video).

Acoustic bottom recorder. Deployment and recovery. Electrolytic acoustic release.



Initially based on commercial recorders (from M-Audio MicroTrack II to current Yamaha and Zoom solid state recorders, offering up to 48kHz in bandwidth at 24 bits). A custom control circuit was designed and integrated to offer full programmability of the units according to the desired recording schedule. RASPs can record acoustic signals following a time schedule, only limited by available memory and battery capacity.

MODELS

Currently delivering the RASP 15-SQ26, featuring a single Sensor Technology SQ26 preamplifier hydrophone.
Tech drawings, with measures, available here.

RASP 12 C24
Self-contained underwater acoustic recorder.
Based on the YAMAHA C24 and on more recorders in the the RASP12B larger version, returns valuable results with minimum costs.

Featured with a Sensor Technology SQ26 or CRT hydrophone, is prepared into an PVC canister.

It is suitable to monitor continuous acoustic events, like dolphin predation on nets, and features a programmable recording slot over the 24hrs.
About the RASP12 - About the larger RASP12B
Stacks Image 15

MT 150US
Based on M-Audio MicroTrack II with a custom made programmable timer, supports up to one 64GByte compact flash card.
The battery pack has a 12.000mA nominal capacity and is made of NiMH fast rechargeable cells with an ultra-low-dropout voltage regulator.
Uses a Sensor Technology SQ26 hydrophone (other hydrophones can be selected). It is fit into an aluminium canister, 9cm diameter and 30cm tall.

MT 200
Same as the MT 150US model, the MT 200 has a 26.000mA battery pack, in longer canister (50cm).



Service

RASP tech sheets (older docs)
Sample recordings:
M-Audio Microtrack 24/96 set at min gain, max quality:

40kHz sweep @ 500mV peak-to-peak

40kHz sweep @ 100mV RMS