Educational FTIR/FTNIR modular spectrometer Interspec 408

Educational FTIR/FTNIR modular spectrometer Interspec 408



Wavelength range, IR 7000 to 400 cm-1
Wavelength range, NIR determined by detector: 14000-5800 or 9000- 3850 cm-1
Resolution 2 cm-1
Interferometer Pendulum type with roof mirrors
Output beam diameter 25 mm
Optical axis height 55 mm
Aperture ratio f 3.2
Beamsplitter, standard IR Multicoated KBr
Beamsplitter, option IR ZnSe
Beamsplitter, option NIR Fused Silica
Frequency reference VCSEL laser
IR source ceramic
NIR source Quartz-halogen lamp
Dessiccant possibility Yes
Interface USB
Data acquisition system 24 bit, high speed
Power 12 VDC, 30W
Dimensions, interferometer W22(26)xD20xH10 cm
Dimensions, power and data acquisition system W16xD12xH11 cm
Dimensions, detector and sample holding system W37xD10xH8 cm
Weight 7 kg
Temp. environment 15 – 28 0C
Humidity environment Best below 65%


Interspec 408 is an educational Fourier transform infrared/near-infrared (FTIR/FTNIR) modular spectrometer for teaching spectroscopy in the science and university labs to promote the use of infrared spectroscopy as a general-purpose, broad-based measurement tool, and to enable the use of state-of-the-art FTIR technology for teaching and science purposes.

With the wavenumber range from 7000 to 400 cm-1 (IR) / 14000 to 3850 cm-1 (NIR) and spectral resolution of 2 cm-1, the interferometer module with detector system, power supply and data acquisition system forms an open architecture sample compartment modular spectrometer capable to use most of FTIR accessories available in the market. It makes the instrument very flexible for different kind of applications in science and teaching lab.

The interferometer module has a transparent plastic cover to allow visual access to all of it’s major parts, 25-mm collimated output beam, a multicoated KBr beamsplitter, a high-intensity ceramic IR source, and an USB interface. For easy access, those system components which have a finite lifetime (i.e. laser, and radiation source) are well accessible at the front side of the module. FTIR spectroscopic software Interspec for Windows is a program for running the spectrometer and for complete handling of measured infrared data.

Interferometer Performance

The interferometer compartment under cover is 170 x 190 mm wide and 90 mm high. The Interspec 408 series of instruments employ a sealed and desiccated interferometer, ensuring high spectral integrity with low levels of water vapour within the interferometer.

We also offer a version (408Z) that employs a ZnSe moisture insensitive optics (beamsplitter and compensator) to be impervious to humidity. Near infrared version (408N) employs a fused silica optics and is insensitive to any influence of water vapour. Resolution in the infrared is available 2 cm-1. The overall wavelength range is from 7000 to 400cm-1 (IR) or from 14000 to 3000 cm-1 (NIR).

Power and Data Acquisition Unit


Power and data acquisition unit

This unit has 12V input and consists of power supply and data acquisition system. The unit connects detector with data acquisition system and PC. Connection to the PC via USB interface unit USB22.

Open architecture sample compartment

Open architecture sample compartment allows to use most of ordinary FTIR accessories available in the market. IR or NIR detector unit with collimating off-axis parabolic plus ellipsoidal mirror and sample slide mount is creating open architecture sample compartment.

In case of IR spectral region a selected high sensitivity DLATGS pyroelectric detector is available. In case of NIR spectral region two types of photodiodes are available: Si and InGaAs. The InGaAs detector is with spectral range either from 0.7 to 1.7 µm or from 1.2 to 2.6 µm.


Open architecture sample compartment with detector system

Different Accessories


Educational FTIR spectrometer with demountable liquid cell


Educational FTIR spectrometer with ATR accessory incl. pressure applicator


Interspec for Windows is supplied on CD and provided with each system shipped. The software includes features for all standard analytical requirements including manipulation of spectral data, instrument control, plot with preview on the screen plus many others.

Also included are several facilities for analytical modelling of interferogrammes or spectra, with smoothing, and baseline correction, interactive editing and data manipulation . Also spectral subtraction, mixture subtraction, smoothing derivatives, plot with preview etc. Data import and export is possible in ASCII, Excel, SPC or JCAMP formats.



Interspec 408 – Standard FTIR Module with KBr optics.

Interspec 408Z – Non-hygroscopic FTIR Module with ZnSe optics

Interspec 408N – Near Infra FTIR Module with fused silica optics.

Interspec 408 Data sheet – DOWNLOAD

Scroll to Top