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TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt
Telefon: +49 6151 4259 78
Telefax: +49 6151 4259 88 
E- mail: info [at] 

S90-IR - infrared

S90-IR - compact infrared spectrometer


The compact high-sensitivity spectrometer S90-IR contains a non-cooled linear InGaAs image sensor and thus is recommended for NIR spectroscopic applications. The instrument is fiber-coupled, does not contain any moving parts, has a monolithic housing for best stability and is powered and controlled via full-speed USB interface.


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  • Description
  • Specifications
  • Pictures
Tab 1


  • High-sensitivity non-cooled InGaAs detector
  • Compact monolithic case ensures stability of parameters
  • Diffraction grating, spectral range and resolution are chosen at the time of order placing
  • User-friendly interface compatible with Windows XP, Windows 7, 32/64 bits

The compact high-sensitivity spectrometer S90-IR contains a non-cooled linear InGaAs image sensor, and is recommended for any spectroscopic applications in the NIR spectrum range such as fluorescence, reflection, transmittance, photometric measurements and other research which do not require long-time signal storage.

The high-aperture optical scheme of the S90-IR has no moving parts.

The S90-IR case is monolithic and ensures long-time stability of parameters.

The S90-IR spectrometer is easy and convenient to use: it is calibrated by the manufacturer, is controlled and powered from the PC via Full-Speed USB interface.

Light input with the use of quartz optical fiber provides flexibility of instrumentation arrangement. The spectrometer has the entrance slit of fixed width and may be used without optical fiber.

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 S90-IR response

Spectral curve of sensitivity of the InGaAs linear image sensor, G9204-512D model

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S90-IR skizze 

Overall dimensions of the S90-IR spectrometer

Tab 2

Spectral range, nm 780 - 1700
Focal length, mm 87.7
F/number 1 : 7.7
Entrance slit 20 µm * 3mm
Spectral resolution depends on selected diffraction grating (see table below)
Detector model G9204-512D
Number of pixels 512
Pixel size, µm 25 x 500
Active area size, mm 12.8 x 0.5
Maximum spectral sensitivity, nm 1550
Non-uniformity of sensitivity 1) 4), % ± 5
Anti-blooming 2) Yes
ADC 16bit, 125kHz
Mean-square reading noise 4) < 6 ADC counts
Dynamic range ~ 12000 : 1
Exposure time 8.2ms – 0.7s 3) 4)
Frame processing time, ms 4.1
Thermoelectric cooling No
Operating temperature, °C 10–30
Computer interface Full Speed USB
Synchronization IN/OUT
Optical input IR-fiber dia 0.6mm, length 1m, SMA-905 connector
Dimensions, mm 142 x 110 x 80
Weight, kg 1.2

Recommendations for choosing a diffraction grating When placing an order, you should choose the number of grating lines (i.e. spectral resolution of your instrument), as well as the spectral range for operation. For your convenience the table below contains average values of grating dispersion, spectral resolution and simultaneous recording interval of the CCD-detector.
Diffraction gratings, lines/mm 150 200 300 400 600
- spectral range of InGaAs detector sensitivity, nm 780 - 1700 nm
- multichannel array bandpass (average), nm 954 710 464 320 210
- reciprocal linear dispersion (average), nm/mm 74,5 55,5 36,3 26,5 16,6
- spectral resolution (average), nm 4,6 3,4 2,3 1,7 1,0

EXAMPLE: If you are interested in the grating 200 lines/mm (average spectral resolution 3.4nm), it remains to choose a location of simultaneous recording interval 710nm within the possible spectral range of 780-1700nm, for instance, the S90-IR spectrometer operating in the range 990-1700nm with 3.4nm resolution.

1) Signal level - 50% of saturation. Exposure time is 10 ms.

2) Anti-blooming – sensor's feature eliminating overflow of charges from over-exposed pixels to neighboring ones.

3) Maximum storage time is deemed to be the time at which dark signal makes up 25% of the dynamic range at the ambient temperature +25°C.

4) The detector provides two operation modes: wide dynamic range or high sensitivity. Parameters indicated in the table are for the wide dynamic range mode.

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