CE332

Airborne multiband infrared radiometer

Remote sensing instruments

Overview

Features


Applications

CE332 radiometer is particularly adapted to applications needing the radiometer to be airborne or vehicle boarded
      • Atmospheric researches ( clouds and aerosols remote sensing, radiation impact...)
      • Agronomy (uncovered soils and plant covers)
      • Evapotranspiration
      • road temperature measurements
      • Oceanography (surface temperature)
      • Ground surface characterization (agronomy, geology...)
      • Rising air current measurements
      • Cirrus researches

Benefits

Accuracy and stability of the measurements
      • Field of view narrow and strictly specified (3°)
      • Long-life measurements stability even in harsh climatic conditions
      • Very low radiometric noise 
Operating reliability
      • No sensitivity to vibrations or to pressure
      • Embedded heating device
      • High reliability due to Köhler system
      • Fast recalibration during  flight by manual triggering
      • High robustness and corrosion resistance (expected life-time more than 10 years)
      • Reduced routinely housekeeping
Flexibility of use 
      • Autonomous : operates without any human attendance in a complete automated way with its own tiny solar generator and a satellite beacon
      • Portable : the instrument is compact (13 cm x 20 cm), easy to use and to move because of the system integration and lightness (< 2.5 kg)

Technology

MicroAmps® technology  The CE332 airborne radiometer was designed using all the MicroAmps® technologies that are specific to Cimel, in accordance to very demanding yet complementary requirements: 
      • Minimize electrical power consumption
      • Use secure, highly redundant communications protocols
      • Maximize the versatility of printed circuit boards
      • Minimize the number of connectors 
These MicroAmps® technologies result in CE332 airborne radiometer exceptional performances widely proven under any sort of climate, in terms of operating reliability Optical head
      • It includes three thermopile detectors, two lenses, three infrared filters
      • Linked with a wire to the acquisition unit
      • Bandwidth  at 1µm at mid height
      • The main optical system is built around two lenses: the objectif that is set up forward the instrument and a condenser disposed in the focal field of the lens. The detector itself is placed between the condenser and the objective
      • The optical head is equipped with 3 infrared bandwidths
      • Integrated temperature platinum sensor (temperature reference)
      • Includes an acquisition card (power supply and data processing)
      • Confined in a sealed box
The lenses
      • The objective lens is a convex lens cut in germanium known for its  high and its low optical dispersion: very low refraction between 8-14µm 
The interferential  filters    
      • Three filters  bandwidth  at 1µm at mid height, each of them centered either at 8.7 µm, or 10.8 µm, or 12 µm long wawe
The thermopile
      • Is equipped with a germanium  aperture that  gives way just to the 8-14 µm bandwidth
Selenium zinc blade :
      • It ensures the elimination of the black body radiance over 40 µm
Retractable mirror
      • Placed just forward the objective lens, it reflects thanks to a wheel operated by a stepper motor the radiance  emitted by the cavity where the  detector is embedded
      • Good coating quality: the golden silicon coating has a great reflective action
The detectors The three thermopiles are composed of several thermocouples connected in series, adapted to measure continuous Infrared radiation or modulated at low frequency
      • The optical head is equipped with 3 infrared bandwidths
      • Integrated temperature platinum sensor (temperature reference)
      • Acquisition unit (power and data processing) 
Robotized mount (option)

Operation

The radiometer
      • The three detectors operate simultaneously in thermal infrared
      • The three interferential filters  centered at 8.7 µm, at 10.8µm, at 12 µm wave length ( with a width at 1 µm at  mid-height) are placed in front of each detector
      • These detectors receive the radiance in an stable angle characterized by an angular field of view of 3° in theory
      • The radiometer optical block is cable linked to an interface that provides power supply, data processing, transmission with the scientific instruments settled
Information system It operates with the software : AirBorne Radiometer 1.0
      • Real time graphical visualization of one channel or three
      • Brightness temperature display of the three channels
      • Target radiance display of the three channels
      • Security: data automatic back up during the measurement
      • Display as configurable tabular
      • ASCII transfer of selected parameters
      • Windows 2000, XP and 7 compatible
   

Technical features

Specifications Parameters Value Other
Measurement Standard
Resolution 0.001°C
Accuracy 0.01°C
CWL 8.7 µm-10.8 µm-12.0 µm 13.0 µm
FWHM  1.0 µm-1.0 µm- 1.0 µm  1.0 µm
NEDT At 20°c : 0.03°C RMS
 Embedded  platinum temperature probe (temperature reference) Resolution  0.001°c
 Filters Type  Interferential
ChannelN8.7 ChannelN10.8> Channel N12   8.7 µm 10.8 µm 12 µm 13.0 µm (optional)
Detection   Type Thermopile
 Output signal Portable PC Serie link RS232
Power supply 12 V in continu
Interface RS232
Environmental conditions Temperature -30°C to +50°C
General Cable length 150 m max
Reinforced insulation and heating device For airborne applications
Double enclosure Pressurized and sealed
Size L 13 cm x H 20cm
Weight 2.4 kg