CAS 140CT IR series – High-performance spectroradiometer for wavelengths in the infrared spectral range (Discontinued)

View our latest version of this instrument, the CAS-140D

Manufacturers of high-class LEDs, luminaires and displays all over the world have for many years been placing their trust in the precise and reliable measuring results of the CAS array spectroradiometer from Instrument Systems.

The two CAS 140CT models IR1 (780 nm – 1650 nm) and IR2 (1500 nm – 2150 nm) are available for measuring wavelengths above 1100 nm. In the IR1 range a model was additionally developed for the measurement of particularly low radiant flux (high gain option). On request available is a high-resolution version of the IR1 model (wavelength range 1310 nm to 1440 nm) with an optical resolution < 1 nm.

Like all spectrometers from Instrument Systems, the infrared models come with a calibration traceable to the PTB or NIST.

MultiCAS system
By combining different CAS 140D models through a trigger box, the infrared models of the CAS 140CT can be upgraded to a MultiCAS system. In this way, complex spectral measurements are simultaneously possible over an extremely wide wavelength range or over multiple samples.

The MultiCAS module of the corresponding SpecWin Pro analytical software evaluates all measurement data by user-friendly means in a common measuring curve.


  • Model versions from 780 nm to 2150 nm
  • In IR1 with additional high-sensitivity option
  • Cooled detector down to -20° C for minimum dark current
  • Spectrograph with excellent stray light suppression
  • Integral density filter wheel
  • Extensive SpecWin Pro spectral software

Development and quality control of high-quality LEDs

The infrared models of the CAS 140CT are among the key measuring instruments in the complex system solutions from Instrument Systems. By virtue of their long service life and reliability, they are employed in the development and quality control of broadband light sources and infrared LEDs.

In combination with other CAS models, the measuring scope of the CAS 140CT spectroradiometer in IR results in an extremely wide application spectrum. Solve your measurement tasks with systems from Instrument Systems – in established brands and new challenges, such as in transmission, reflection or photovoltaics!


LED / Modules -Comprehensive Characterization of LEDs with Integrating Spheres

LED Production-Complete Characterization of LED Chips on the Wafer


 CAS 140CT IR Series
Model IR1 IR1 High-Grain IR2
Spectral Range 780-1650 nm 780-1700 nm 1500-2150 nm


Spectral resolution (100 µm slit) 9 nm 9 nm 15 nm
Data point interval 2.1 nm 2.1 nm 3 nm
Stray light for LED 1·10-3 5·10-4 Not Specified
Wavelength measurement accuracy ±0.5 nm ±0.5 nm ±1.5 nm

The detailed measurement conditions under which the specified values have been determined can be viewed in the attached brochure.

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