CMST Underwater Sound Recorders

The CMST Underwater Sound Recorder (USR) is an innovative device capable of autonomously collecting large amounts of acoustic data under a range of sampling schemes. The USR can be deployed for up to two years and is particularly suited to long term monitoring of man-made and natural underwater sound. It has been successfully used for studies of biological sea noise (fish, whales, etc), physical sea noise (breaking waves), and a variety of man-made underwater sounds.

Specifications:

Interface for one or two hydrophones (standard underwater connector is Subconn LBH3F - other options available)
Integral Pre-Amplifier (20dB gain, user selectable lower frequency cutoff filter - 8Hz or 160Hz)
Integral Anti-Aliasing Filter (0-20db pre filter gain, 6th order Butterworth filter, high frequency cut off from 1kHz to 15kHz, additionally 0-20dB of post filter gain is available on a secondary output)
16 bit Analog to Digital Conversion (Capacity to log 2 hydrophone channels - each hydrophone channel may be concurrently recorded at two different gain settings) (RMS noise of A/D - 3 quantisation levels) (Note: total recorded noise level depends on hydrophone capacitance, amplifier gain, cut-off frequency, etc)
Data Storage - one or two 2.5" hard disk drives and/or Type 1 Compact Flash Card (The hard drives use FAT32 file structure and can be read with a standard Windows PC - individual files for each recording event).
User configurable via RS232 interface (sampling rate (up to 26k samples/sec), bandwidth, gain, sampling durations, record intervals) (support for two user configured sampling schedules)
Various battery pack options are available depending upon the number of hard disk drives required. The standard battery pack will provide the required power to fill a 80GB hard disk drive to capacity.
Deployment durations can last up to 2 years. Ability to syndronise time to GPS and store time difference between unit and GPS on recovery.
Physical Size of the 'standard' unit (stainless steel housing): External dimensions (nominal): diameter = 114 mm, length = 900 mm, weight in air = 30 kg (Other size options are available.)

A range of analytical software is also available on negotiation.

Specifications are subject to change and continuous improvement.