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

Signature VM Ocean - 100|75/55 kHz

Des capacités d'ADCP monté sur coque avec en option un échosondeur pour la mesure de la biomasse

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 Signature VM 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 measurement precision (75 kHz) and a 1000 m profiling range (55 kHz)
  • Four beams for current profiling with a range over 300 m (100)
  • Optional scientific echosounder with multiple modes for biomass (100)

Usage

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

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 3-15 m
Max no. cells 200
Min. blanking 2
Minimum accuracy 1.0% 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** 685/1000 m
Doppler processing Broadband/Broadband & Narrowband
Cell size 6-20 m
Max no. cells 200
Min. blanking 2
Minimum accuracy 1.0% of the measured value ± 0.5 cm/s
Velocity resolution 0.1 cm/s
Maximum sampling rate 1 Hz (1/3 Hz at max power)
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 560 m
Velocity resolution 0.01 mm/s
Maximum sampling rate 1 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 1200 m
Velocity resolution 0.01 mm/s
Maximum sampling rate 1 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 30 m Ethernet cable (inquire for options)
IO Ethernet
DC input 15-48 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 460 mm
Maximum length without room for internal batteries 350 mm

Maximum diameter 650 mm
Maximum length without room for internal batteries 314 mm

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, 500 GB
Operating system Windows® 10
Housing Half 19" 2 HE case or 19" rack-mountable 1 HE
Dimensions 265x110x340 mm or 480x45x325 mm
Input 24 V DC, 20 W typical
Total weight 5.75 or 3.80 kg
Connections Power, Signature ADCP, AN_GNSS, 2x HDMI, 2xLAN, 3x USB, 1x RS-232 (optional)

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 NMEA data strings online CSV, ASCII VMT, MATLAB VMT, MATLAB, 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 Online 2x MCBH, NGA061-015 Rev.-
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)

3 beam head (55)

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

Short, no room for battery (external battery canister for bottom-mount use) (same as currently stated; same for 100 and 55)

16 GB SD card data logger (same as currently stated; same for 100 and 55)

64 GB SD card data logger (same as currently stated; same for 100 and 55)

128 GB SD card data logger (same as currently stated; same for 100 and 55)

Pressure sensor, 0-1500 m, accuracy 0,1% of FS (standard) (same as currently stated; same for 100 and 55)

Pressure sensor, 0-100 m, accuracy 0,1% of FS (same as currently stated; same for 100 and 55)

AD2CP: 30 m Ethernet cable with MCIL6MP, Power/RJ45 at dry end (standard) (same as currently stated; same for 100 and 55)

AD2CP: 30-100 m Ethernet cable (specify length) with MCIL6MP-PWR/RJ45 (same as currently stated; same for 100 and 55)

Vessel-mounted over the side (same as currently stated; same for 100 and 55)

Vessel hull-mounted (same as currently stated; same for 100 and 55)

Unmanned Surface Vehicle (USV) mounted (please inquire) (same as currently stated; same for 100 and 55)

Compass and tilt sensor

AHRS

Heading GNSS (dGNSS),

High Accuracy Heading GNSS (RTK)

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