CE351

Atmospheric multi-band imager

Remote sensing instruments

Overview

Features


Applications

        • Continuous monitoring of the sky radiance
        • Aerosols characterizations
        • In complementary use with CE318 photometer
        • Doubled calibration to validation and calibration of satellite measures

Benefits

Precision and stability of the measurements 
        • Instant measure of an hemisphere (+/- 92°)
        • Very high angular resolution (< 1°)
        • Absolute radiance calibration
        • High dynamic range of radiance measurement: 5 orders of magnitude
        • High stability in temperature
        • Very low derivation in time
        • No blooming effect because of CMOS sensor
Operating reliability under any climate
        • Entirely automated operation
        • Robustness
        • Protection IP68
Flexibility of use 
        • Mobile use possibility (15 frames/s), recorded orientation
        • Remote monitoring ( 200 m)
        • Small overall size
        • No maintenance

Technology

Optics 
        • Fisheye type  (patented by Cimel)
        • Telecentric to ease the calibration
        • Non achromatic
Bandpass filters 
        • Mounted on a filter wheel
        • Small incidence angle
Sensor 
        • CMOS: monochrome, less sensitive
        • Ancillary sensor: tilt sensor retrieves continuously the camera positioning to the vertical

Operation

Optical bench for use
        • The imager should be deployed on a fixed bench.

To obtain a better accuracy, it is recommended to equip it with a sun-tracker ball that prevents the lens from all direct sun radiation stray light.

        • 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 car or air craft, ship…)
        • The tilt sensor transfers continuously the camera 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
Output signal   Imager link
Power  5  or 12 Volts
 Environmental conditions -10°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   ∅96 mm x 260 mm

Implementation and maintenance

CE351 atmospheric multi-band imager in colocation with CE318 photometer