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Multi-Channel Radiometer

The ColoRad is a multi-channel radiometer which is able to perform simultaneous radiometric measurements in up to 4 channels (two of which can be cryogenically cooled) with high sensitivity and speed. A new ColoRad model was introduced in December 2007. The new ColoRad includes many improvements over older units and its performance is much enhanced. The new ColoRad is the perfect tool for performing field measurements in a number of defined spectral bands.

For more information
OptionsSpecificationsSpectral engines
  • Radiometric channels are customer configurable and cover the range 0.2÷14 µm
  • Field of view (FOV) options for 40 or 80 mrad with the ability to add telescopes for wide or narrow FOV (as an example, a ColoRad may be ordered with 40 mrad FOV and an additional set of telescopes to increase the FOV to 80 mrad)
  • Operates in chopped mode for high sensitivity and direct mode for fast measurements (with sampling rates > 100 KHz/channel)
  • User replaceable spectral filters and ND filters easily replaced during operation
  • Comes complete with a small ruggedized PC and Power supply in separate carry case




Number of Channels

2-4 channels

Up to 2 cryogenic cooled channels, configurable spectral engine combinations

Filters (per channel)

1 spectral filter

1 ND filter

2 filter slides in the optical path for each channel


ND1, ND2, ND3

Included for each channel

Filter Slides

Accommodate 1”  diam. filter, 1.6 mm thick

User mountable

Field of View size

2.3° (40 mrad) or 4.6° (80 mrad)
or 9.2° (160 mrad) or 18.4° (320 mrad)

Optional attachable telescopes

Field of View non-uniformity

< 10% of maximum


Field of view Size accuracy

< ±10% FWHM


Channel Bore sight Accuracy

±0.2° (±3 mrad)


Modes of operation

Lock In (LIA) for high sensitivity Direct (DIR) for high speed

AC Coupled

DC Coupled

Chopping Frequency

100 - 1000 Hz

 SW controlled chopper.

DIR  mode Band Width

60kHz (-3db)

Chopper is in hold position

DIR Mode rise time

< 10µsec


DIR Mode Gain Selection

1, 10, 100

SW selectable


10-9-10-10 W/cm2 for DIR mode

10-10-10-12 W/cm2 for LIA mode

Depending on the specific channel

Data Acquisition

 Up to 200 Ksample/sec/channel


Control Interface

RS232 (9600 Baud)


Data interface

USB 2.0


Optical head to controller distance

5 meter cable to the PC

 manual contrast control of  FOV overlay pattern

Bore sight Viewer

CCD with FOV marker overlay and cross hair


Bore sight Viewer FOV

> 5°  or  > 10°


Weight of optical head

< 25 Kg

Depending on number of channels

Optical head Dimensions

L 735 x W 294 x H 329 mm

With shade cover

Power supply

100 - 240 VAC  50-60 Hz

External power supply with 5m cable

Environmental Conditions - Work

0°C ÷  40°C


Environmental Conditions - Storage

-15°C ÷70°C

Storage in case

Condensation prevention

Dry N2 purge valve available


Carry case dimensions

L 857 x W 730 x H 429

Rugged carry case with compartments for cables and accessories

  • Available detectors: Si, PbSe, InGaAs, InSb, MCT, PV-MCT
  • Available appertures: 23/48mm.
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