Nortek Signature100vm low
Nortek Signature VM Ocean 55k Hz frontview
Figure 7
IMG 20210823 091134
Nortek Signature100vm low
Nortek Signature VM Ocean 55k Hz frontview
Figure 7
IMG 20210823 091134

Vessel-mounted

VM Ocean (100|75|55 kHz)

Delivers vessel-mounted ADCP capabilities with an optional scientific echosounder for biomass measurements.

  • A coherent and modern system that is quick and convenient to operate
  • A novel transducer design allows focusing on measurement precision (75 kHz) and a 900-1000 m profiling range (55 kHz)
  • Optional scientific echosounder with multiple modes for biomass (100 kHz)

Overview

Until now, epipelagic and mesopelagic VM ADCP surveys could not deliver the resolution, precision or range to examine the ocean boundary layer in detail. To study biomass in the upper-ocean boundary layer, you had to add a separate scientific echosounder.

Nortek’s vessel-mounted Ocean in the 100 kHz version opens up new opportunities to measure currents and to study biomass simultaneously. The 55 kHz version offers long-range current profiles with a proper precision.

  • Currents
  • Echosounder
  • Bottom track

Highlights

  • A coherent and modern system that is quick and convenient to operate
  • Automated processing
  • VM or stand-alone applications
  • A novel transducer design allows focusing on high-resolution measurements (75 kHz) and long-range measurements (55 kHz)
  • Four beams for current profiling with a range over 300 m (100 kHz)
  • Optional scientific echosounder with multiple modes for biomass (100 kHz)

Usage

  • Internal waves
  • Upper-ocean boundary-layer studies (100 kHz)
  • Detection of krill or plankton in the water column (100 kHz)
  • Deep-water current profiles, ocean discharge (55 kHz)

Setup

The 100 and 55 kHz units are typically mounted inside the hull or in a lowered structure attached to the hull, such as an instrument gondola. Nortek has a mounting guide available.

Deployment

View current velocity data in real time from the VM acquisition software while onboard the vessel. Gather long range current speed and direction information with the 55 kHz unit or use the 100 kHz unit for intermediate profiles and biomass estimates.

Data

Biomass estimates of fish and krill and detections of internal waves with the optional 100 kHz scientific echosounder can be further processed using Echoview software. Process and export current data subsets of interest using the VM review software once your survey has ended.

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Profiling range**

300-400 m

Doppler processing

Broadband & Narrowband

Cell size

3-16 m

Max no. cells

200

Min. blanking

2

Minimum accuracy

1% of the measured value ± 0.5 cm/s

Velocity resolution

0.1 cm/s

Maximum sampling rate

1 Hz (1/3 Hz with BT and echosounder)

Velocity range (along beam)

5 m/s

No. of beams

4 slanted at 20°

**) Depending on acoustic scattering condition.

Profiling range**

685/900-1000 m

Doppler processing

Broadband/Broadband & Narrowband

Cell size

5-20 m

Max no. cells

200

Min. blanking

2

Minimum accuracy

1% of the measured value ± 0.5 cm/s

Velocity resolution

0.1 cm/s

Maximum sampling rate

1 Hz

Velocity range (along beam)

5 m/s

No. of beams

3 slanted at 20°

**) Depending on acoustic scattering condition.

Single ping std @ 3 m/s

TBA

Long-term accuracy

TBA

Minimum altitude

5 m

Maximum altitude

540 m

Velocity resolution

0.01 mm/s

Maximum sampling rate

1/2 Hz (1/3 Hz with VP and echosounder)

Single ping std @ 3 m/s

TBA

Long-term accuracy

TBA

Minimum altitude

50 m

Maximum altitude

1000 m

Velocity resolution

0.01 mm/s

Maximum sampling rate

1/2 Hz

Sampling

Same as velocity for slanted beams

Resolution/dynamic range

0.5 dB/70 dB

Dynamic range

70 dB slanted beams

Transducer acoustic frequency

100 kHz

No. of beams

4 slanted at 20°

Beam width

6.1°

Sampling

Same as velocity

Resolution/dynamic range

0.5 dB/70 dB

Dynamic range

70 dB slanted beams

Transducer acoustic frequency

75 and 55 kHz

No. of beams

3 slanted at 20°

Beam width

4.5°-5.5°

No. of beams

1 vertical

Transducer acoustic frequency

70-120 kHz

Sampling

1 Hz (1/3 Hz with VP and BT)

Transducer beam width

15° @ 70 kHz, 8.7° @ 120 kHz

Resolution

0.375 –4 m

Resolution/ dynamic range

0.01 dB/130 dB

Transmit pulse

Monochromatic 70 kHz, 90 kHz and 120 kHz or frequency chirp (90 kHz, 50% BW)

Transmit power

7.5-120 W adjustable

Chirp signal processing

Pulse compression or binned frequency response

No. of beams

N/A

Transducer acoustic frequency

N/A

Sampling

N/A

Transducer beam width

N/A

Resolution

N/A

Resolution/ dynamic range

N/A

Transmit pulse

N/A

Transmit power

N/A

Chirp signal processing

N/A

Temperature sensor range / accuracy

-4 °C to 40 °C / 0.1 °C

Pressure

Piezo resistive

Standard range

0-1500 m (inquire for options)

Accuracy/precision

0.1% FS / Better than 0.002% of full scale

Compass and tilt

Solid-state magnetometer and accelerometer

Data recording

16 GB (inquire for options)

Data cable

10 m Ethernet cable. Other lenghts available

IO

Ethernet

DC input

24-48 V DC

Temperature sensor range / accuracy

-4 °C to 40 °C / 0.1 °C

Pressure

Piezo resistive

Standard range

0-1500 m (inquire for options)

Accuracy/precision

0.1% FS / Better than 0.002% of full scale

Compass and tilt

Solid-state magnetometer and accelerometer

Data recording

16 GB (inquire for options)

Data cable

30 m Ethernet cable (inquire for options)

IO

Ethernet

DC input

48 V DC

Maximum diameter

455 mm

Maximum length without room for internal batteries

392 mm

Weight in air

29 Kg (5 beams)

Maximum diameter

650 mm

Maximum length without room for internal batteries

314 mm

Weight in air

57 Kg

Operating temperature

-4 °C to 40 °C

Storage temperature

-20 °C to 60 °C

Vibration

IEC 60068-1/IEC60068-2-64

EMC approval

IEC 61000

Depth rating

1500 m – Bottom track is limited to surface vessels

Connectors

Straight fitted MCBH6F (Ethernet)

Housing

Small instrument housing

Material

POM with titanium fasteners

Processor/memory

Intel i5/8 GB

Hard disk

SSD, 256 GB

Operating system

Windows® 10

Housing

19" rack-mountable 2 HE

Dimensions

482x87x400 mm

Input

110-240 V AC, 100 W Max

Total weight

7 kg

Connections*

Power, Signature ADCP, 2x DisplayPort, 1x LAN, 2x USB, 4x RS232|RS422|RS485 configurable port*

*) Processing unit requires heading and GNSS input over Serial or Ethernet

Acquisition

Signature VM - binary, GNSS compass - binary

Timing

< 0.6 s, IEEE1588/PTP for absolute time stamping (GNSS/Signature VM)

Configuration

Signature VM (partly) GNSS Advanced navigation

Display

Vessel track in map, Bottom-track velocity, Bottom-track depth, Velocity magnitude and direction, Echo amplitude (slanted beams), Echo correlation (slanted beams), corrected relative volume backscatter (100)

Status

Signature VM + AN_GNSS compass

Output

Online: NMEA data formats. Offline: CSV, ASCII VMT, MATLAB, MATLAB VMT, MATLAB QRev, KML

Accelerometer dynamic

± 2 g

Gyro dynamic range

± 250°/sec

Magnetometer dynamic range

± 1.3 Gauss

Pitch and roll range/resolution

± 90° (pitch), ± 180° (roll)/0.01°

Pitch and roll accuracy

± 2° (dynamic)3), ± 0.5° (static, ± 30°)

Heading range / resolution

360°, all axes/0.01°

Heading accuracy

± 3° (dynamic)3), ± 2° (static, tilt < 20°)

Sampling rate

Same as measurement rate

Signature 100 VM General Arrangement
Signature 55 VM General Arrangement

Declaration of conformity
Declaration of conformity - Signature VM
Declaration of conformity - Signature 55
Environmental test report, Vibration test - Signature 55
Statement of Compliance - Signature 55

Signature100 VM Ocean

Signature55 VM Ocean

4-beam head (100)

5-beam head (adds 95 kHz center transducer for echo sounder)(100)

3 beam head (55)

Short, no room for battery (requires external battery canister for bottom-mount use)

16 GB SD card data logger

64 GB SD card data logger

128 GB SD card data logger

256 GB SD card data logger

Pressure sensor, 0-1500 m, accuracy 0,1% of FS (standard)

Pressure sensor, 0-100 m, accuracy 0,1% of FS (option)

AD2CP: 20 m Ethernet cable towards the junction box with MCIL6MP on both ends

Vessel-mounted over the side

Vessel hull-mounted

Unmanned Surface Vehicle (USV) mounted (please inquire)

Compass and tilt sensor

AHRS (option)

This package includes the acquisition and review software

New features, fixes and functionality

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