CAS 140CT IR series Array spectroradiometer for precise infrared radiation measurement

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

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.

CAS 140CT IR series – Product details for infrared models:

  • 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, e.g. in transmission, reflection or photovoltaics!

CAS 140CT IR series – Technical data

Model versions


IR1 High-Gain


Spectral range

780-1650 nm

780-1700 nm

1500-2150 nm

Spectral resolution (100 µm slit)

9 nm

9 nm

23 nm

Data point interval

2.1 nm

2.1 nm

4.1 nm

Stray light for LED




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 looked up in the data sheets and brochures or requested from Instrument Systems.