Glass Flotation

Network and Data Storage Lead Acid Battery

Acoustic Release

Anchor

378 Meter Aperture32 3-axis vector sensors12.2 meter spacing

378 meter aperture64 element hydrophone array

6.1 meter spacing, 125 Hz

189 meter aperture64 element hydrophone array

3 meter spacing, 250 Hz

94.5 meter aperture64 element hydrophone array

1.5 meter spacing, 500 Hz

ARAP Overview

ARAP Acoustic Sensor Electronics Module

• 3 variations; -1, -3, or -7 preamp hydrophones (-1 version shown)

• 4.5 inch inside diameter• Lengths -

– -1 = 8.25”– -3 = 9.25”–-7 = 11.25 “

• Aluminum

ARAP Test Array

• Scientific array – Validate low ambient noise at depth– Demonstrate RAP performance in

area of interest– Proof of concept vector sensor array– Provide data for deployable array

design

• Deploy/Recover from R/V• Record element level data

Glass Flotation

Network and Data Storage Lead Acid Battery

Redundant Acoustic Release

Anchor

378 Meter Aperture

Mechanical Cable• Torque Balanced

Hydrophone spacing 5.0 Feet (1.52 m)

Vector + hydrophone+ 7 Hydrophones w/ preamp8 assemblies required

flotation

2 SeaBatteries

Vector sensor spacing 40.0 Feet (12.2 m)

~16

fee

t

D Module(500 Hz hydrophone array)

Hydrophone spacing 5.0 Feet (1.52 m)

Vector + hydrophone+ 7 Hydrophones w/ preamp8 assemblies required

flotation

2 SeaBatteries

Vector sensor spacing 40.0 Feet (12.2 m)

~16

fee

t

D Module(500 Hz hydrophone array)

Hydrophone spacing 10.0 Feet (3.04 m)

Vector + hydrophone+ 3 Hydrophones w/ preamp8 assemblies required

flotation

SeaBattery

Vector sensor spacing 40 Feet (12.2 m)

~16

fee

t

B Module(250 Hz hydrophone array)

ARAP Vector Sensor • Steel strength members

• Hydrophone

• Spherical vector sensor

• 16 spring VS suspension

• Delrin cage

• Electronics housing w/compass & tilt sensors

• Weight in air = 75 lbs

• Weight in water = 20 lbs

Data Collection Node• DCN Pressure Housing

– Network Controller– 2 Single Board Computers

(LINUX)– 8 each 100 GBYTE HDD

• Acoustic Modem• Flotation• 4 Sea Batteries• 40 feet above topmost vector

sensor• Weight in air = 785 lbs• Weight in water = ~200 lbs

Recovery – Incremental lifts