High precision IR Radiometer CLIMAT

Remote sensing instruments




The CE312 radiometer is the benchmark scientific instrument for many demanding applications for accurate measurement of brightness temperatures:
        • Validation of satellite-borne (AVHRR, ASTER,…)- or  airborne sensors
        • Ground surface characterization (agronomy, geology…)
        • Measurement of ground surface temperatures
        • Study of desert aerosols, cirrus and arctic cirrus
        • Characterization of coarce aerosols (in colocation with CE318 photometer)


Precision and stability of measurements
        • High precision: 0,1°C
        • Large temperature range : -100°C to +60°C
        • Narrow strictly-defined field of view (10°)
        • Long-life measurements stability even under harsh climatic conditions
        • Measurement time : 1 s per band
Operating reliability
        • No sensitivity to vibrations or climatic conditions
        • High robustness and corrosion resistance (expected life-time more than 10 years )
        • No maintenance
Flexibility of use
        • Autonomous: operates without any human attendance in a complete automated way with its own solar generator
        • Practical: Real time display of spectral luminance and brightness temperature
        • Multi-tasks: suitable for both long-term installation for observation networks and for measurement field campaign
        • Portability : components are compact, light, easy to move in a hard case

The CE312 IR radiometer ready to be transported in its watertight carrying case



MicroAmps® technology The CE312 radiometer IR has been 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 CE312 radiometer exceptional performances widely proven under any sort of climate, in terms of operating reliability. Optical head
      • It includes a detector that covers the entire spectral band from 8µm to 14µm and three narrower filters (from 8.2µm to 12.5µm)
      • The detector has an optical line-of-site channel with a narrow, strictly-defined field of view
      • A motor-driven filter wheel positions up to five accurate monoband filters in turn
      • The detector is  silicon thermopile   highly sensitive, low-noise, resistant to changes in temperature
      • A gold coated  mirror, mounted on a second wheel, retrieves to the detector its own thermal picture for internal radiation measurement
      • A precision probe measures the detector temperature that is referenced
      • Power supply by an external battery or by  its charger block


Optical head performs automatic measurement scenarios of the differential radiation between the target and the reference mirror. Display box ensures the power supply to the optical head and the transmission between the head and the PC. Software functions:
      • Configuration of measurement scenarios (filters, frequencies, self-calibrations…)
      • Measurements are possible manually (no scenario)
      • Real time determination of the brightness luminance and  brightness temperature
      • Raw and processed data real time recording on the PC
      • Possibility of data export for post-processing

CE312 & PC

In option: the head can be mounted on a one or two axis robot (see below options) to automate:
      • Multi targets measurement
      • Blocking the aperture in case of bad weather

Technical features

  Features Value
Accuracy 0.1°C
Measurements Resolution 0.01° C
 Response time  1s
Repeatability >99.65%
IFOV  10°
Calibration  Provided with the instrument
Detector Type Silicon thermopile
Size 0.6mm x 0.6mm
Noise voltage 38 nV Hz -1/2 
Responsivity 120 W m-2 
Detectivity 1.6 x 108cm Hz -1/2 / W-1
Filters  Steep pass band filter
Out of band Optical density  OD 3
Spectral bands  Channel W 8-14 µm
Channel N12 11.50-12.50 µm
Channel N11 10.30-11.30µm
Channel N9 8.20-9.20  µm
Output  RS-232
Or current loop
Power Display box batteries Reloaded via electric power
Environment Temperature From -20° to +50°
Information system PC type  EeePC Windows already set up
AstpWIN software with radiometer application
Free download at : www.cimel.fr
Data transfer
Housing Head Ø=80mmX250mm weignt= < 1kg
Measurement cable 3m link between the head and the interface box
Interface box With power supply block
Link to PC See output options


The CE312 IR Radiometer operating measurement with its optical head pointing the sky ( LOA of Lilles -France-)

The CE312 IR radiometer ready to be transported in its watertight carrying case


Bands options

Sales reference Spectral bands
CE312B-1 8 to 14 µm (large band) 8.2 to 9.2 µm 10.3 to 11.3 µm
CE312B-2ASTER 8 to 14 µm (large band) 8.1 to 8.5 µm 8.5 to 8.9 µm 8.9 to 9.3 µm 10.3 to 11 µm 11 to 11.7 µm
CE312B-11 8 to 14 µm (large band) 8.2 to 9.2 µm 10.5 to 12.5 µm 10.3 to 11.3 µm 11.5 to 12.5 µm
Other bands Consult us

Output options

Sales reference  Connection types Supply 
CE312-L Current loop with RS-232 compatible connector for connection up to 1000m Cable kit (3m length)
CE312-MU Local connection via PC or USB  PC cable or USB
Extension  For current loop only Extension cable custom-built

Automation Options

Sales reference Type
CE316-A  Two axis automated tracking mount
CE316-A1 One axis automated tracking mount