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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] topag.de 

S41 - lens spectrometer

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S41 - compact lens spectrometer

S41

The model S41 miniature lens spectrometer is using a three lens achromat-anastigmat as collimating and camera optics. The input is fiber-coupled, the system exhibits high linearity and wide dynamic range. Spectral ranges from UV to IR are covered by three models. The S41 is computer-controlled via USB and does not require an external power supply.

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Bezeichnungen der Tabs

  • Description
  • Specifications
  • Spectrum
  • Pictures
Tab 1

Features

  • Miniature design
  • High aperture ratio
  • High linearity and wide dynamic range
  • No need for an external power source
  • Choice of spectral ranges and resolutions tailored to your requirement

Apllication

  • Spectrometric & spectrophotometric research
  • Industrial color measurements
  • Spectral evaluation of light sources, etc.

The miniature single-channel lens spectrometer S41 is developed on the basis of three-lens achromat–anastigmats used as collimator and camera objectives. This feature provides for a number of significant differences of the S41 from other spectrometers of its class:

  • The S41 is a very compact spectrometer
  • Compared to reflective optics, lens objectives ensure lower stray light
  • Objectives are centered systems providing calculation and correction of aberrations

As a result of the above mentioned advantages, the S41 features low stray light and no astigmatism in the image plane, thus ensuring high S/N ratio and good overall system sensitivity at using a height-limited linear image sensor.

The S41 comprises a built-in detector based on the Hamamatsu S8378-512 image sensor with the active area size of 12.8mm. The detector ensures excellent linearity, wide dynamic range and no modulation of broadband spectra.

 

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S41-Optical scheme 

 

Optical scheme of S41

The S41 spectrometer is convenient and easy to use: it is calibrated by the manufacturer, does not contain any movable parts, is controlled and powered from the computer via the Full-Speed USB interface.

The S41 can be triggered from your light source with standard TTL trigger pulses via the BNC-58 connector. The S41 is able to produce TTL trigger pulses as well.

The S41 delivery set contains a USB control cable, direct and reverse synchronisation cables and UV optical fiber. Light input with the optical fiber provides flexible arrangement of your instrumentation system. The S41 is able to operate without the optical fiber, with analysed light steered directly to its entrance slit.

Tab 2

SPECTROMETER S41
F/Number 01:06
Entrance slit 40 μm * 3mm
Diffraction grating, lines/mm1) 1200 600 600
Spectral range, nm 200 - 400 390 - 780 754 -1140
 Reciprocal linear dispersion (average) nm/mm nm/pixel 16.57 0.414   33.28 0.83  30.27 0.76
 Spectral resolution (average), nm 0.9 – 1.2  1.7 – 2.5   1.6 – 2.3
Accuracy of wavelength detection, not more than, nm ± 0.5 ± 0.9 ± 0.8
Detector based on the S8378-512Q linear image sensor, 512 pixels with the size of 25μm
Active area size, mm 12.8 x 0.5
Min. exposure time, ms 1.0
Max. S/N for 1 Scan 3500:1
ADC Resolution 14 bit, 16384 counts
Computer interface Full-Speed USB interface
Synchronization INOUT
Requirements to external trigger pulse  
- polarity Positive
- amplitude, V 3-15
- pulse duration FWHM, µs 5-20
- connector BNC-58
Parameters of the trigger pulses  
- polarity Positive
- amplitude, V 4-5
- pulse duration FWHM, µs 10
Optical input UVOptical Fiber 0.6 (0.4) mm dia., 1m length, SMA-905 connector
Dimensions, mm 129 x 78 x 53
Weight, kg 0.76

1) For obtaining spectral parameters differing from the above, diffraction gratings with a different quantity of lines can be used.
Tab 3

SPECTRA RECORDED WITH THE S41

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S41-Spektrum 1 

Fig.1: Argon lamp spectrum recorded with the S41 spectrometer

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S41-Spektrum 2 

Fig. 2: Normalised luminance factor spectra of natural environment objects*: black – duckweed from the Tsimlyansk water-storage basin, green – green bulrush, yellow-green – dry yellow bulrush, red – artificial water ecosystem

* Courtesy of Water Problems Institute, Russian Academy of Sciences, Southern Branch, Rostov-on-Don, Russia

 

 

Tab 4

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