CE600

Underwater multi-band imager

Remote sensing instruments

Overview

Features


Applications

        • Measurement of the upper ocean heating rate, of the albedo, of the spectral radiance in all directions
        • Continuous monitoring of the ocean radiance dsitribution
        • Characterization of the ocean optical properties
        • Measurement of the heating rate of the sea
        • Studies of the  biodiversity of coastal zones and ocean dim-lighted layers at depth
        • Ocean colour analyse
        •  Sea ice studies in polar areas
        • Validation and calibration of satellite measures (POLDER-II)

Benefits

Precision and stability of the measurements
        • Instant measure of an hemisphere radiance (+/- 92°)
        • Very high angular resolution (< 1°)
        • Absolute radiance calibration
        • High stability in temperature
        • Very low derivation in time
        • High dynamic range of radiance measurement: 5 orders of magnitude
        • No blooming effect because of CMOS sensor
Operating reliability under any climate
        • Entirely automated operation
        • Miniaturized design to avoid self-shading (upwelling radiances measurement)
        • Robustness
        • Protection IP68
Flexibility of use 
        • Mobile use possibility (15 frames/s), recorded orientation
        • Remote monitoring ( 200 m) with electric wire or optical fiber
        • Capacity of drop-down length up to 100 m
        • Small overall size: miniaturized design
        • No maintenance ( protective glass dome just cleaning, a rinse after diving)

Technology

Optics 
        • Fisheye type  (patented by Cimel)
        • Telecentric to ease the calibration
        • Non achromatic
Bandpass filters 
        • Mounted on a filter wheel
        • Small incidence angle
Sensors 
        • CMOS
Ancillary sensors
        • Compass
        • Pressure sensor ( to assess the sea water depth)
        • Tilt sensor ( to retrieve the camera positioning  to the vertical)
        • Temperature and humidity sensor (to control the instrument operation)

Operation

CE600 Underwater camera operation diagram

  Optical bench for use 

Graphic

    • The imager should be deployed on a fixed bench
    • The only required monitoring is to ensure the cleanliness of the lens
    • The imager is linked by cable to a PC
    • The software makes it possible to register all the data automatically and also provides a real time frame
    • The data can be easily transferred for post processing
  Mobile Use
    • The imager can be used mobile (deployed on a ship…)
    • The tilt sensor transfers continuously the imager positioning
    • These data registered with the measures make possible to recover the sky radiance range
 

Technical features

Measures
Bands Channels (nm): 406,438,494,510,560,628
Minimum radiance 5 10-5 W/m²/nm/sr
Maximum radiance  1 W/m²/nm/sr
Range measurement 10-5 à 1 Wm-2nm-1sr-1
Accuracy Better than 1%
Exposure time < 500 ms (movement generated by waves)
Output signal   Camera link
Power   5 volts
Environmental conditions   -5°C to +35°C
Information system   Windows 32 bits
Data acquisition and processing software
Exposure time, scores and filters management
Data acquisition and transfer (200 m) management
Data processing
General  Size Ø 96 mm x 260 mm
Weight 2,4 kg

Commissioning and maintenance

Screen view from CE600 deployed on Atalante ship