Low stray light spectrometer (TORUS)

/ Spectrometers

This spectrometer delivers low stray light and high throughput.

Torus is the new family of aberration-corrected holographic concave diffraction grating spectrometers that delivers low stray light, high throughput and excellent thermal stability for a wide range of measurement techniques such as color measurement, absorbance, reflectance and transmittance.

Our first Torus model is a visible spectrometer (360-825 nm) whose spectral range and low stray light make it especially useful for measuring color, while its increased throughput and great thermal stability make it ideal for the most demanding applications.

  • High-value Miniature spectrometers
  • Scientific-grade spectral performance
  • Wavelength range: 360-825 nm
  • Compact & Robust / Flexible bench design
  • High-speed electronics /Integration time: 1 ms – 65 s
  • Improved throughput
  • Less stray light: 0.015% SRPR @400nm
  • Excellent thermal stability: 0.0056 nm °C
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  • Trace gas amounts in the atmosphere
  • Absorbance of optically dense solutions
  • Precision measurement of leDs, lasers
  • Light sources measurement
  • Medical dosimetry in tissue and biological media
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Dimensions149.9 mm x 119.4 mm x 63.5 mm
Weight954 g
Operating temperature-10 to +50 °C
Detector typeSony ilX511B
Detector range200-1100 nm
Pixel well depth~62,500 e-
 Optical Bench
DesignFlat field
Focal length85 mm
Entrance aperture25 μm or 50 μm wide slit or fiber with user-selectable aperture (tested at F3
and F4)
GratingsToroidal concave holographic (blazed @ 400 nm)
Mechanical interface8-32 threaded holes at base (3 places)
Optical input interfaceSMA 905 fiber connector and C-mount lens adapter
Wavelength range360-825 nm
Optical resolution≤2.0 nm FwhM over the spectral range
Signal-to-noise ratio250:1 (at full signal)
A/D resolution16 bits
Dark noise50 rMs counts, 300 counts peak to peak
Dynamic range8.5 x 107 (system); 1300:1 (single acquisition)
Integration time1 ms-65 s
Stray light0.015% @ 400 nm
Corrected linearity≥99%
Thermal stability≤0.025 nm/ °C (wavelength stability)
Power consumption250 ma @ 5 vDC
Power optionsUSB or GPIO port
Data transfer speedFull spectrum every 1 ms with USB 2.0 port, 15 ms with USB 1.1 port, 200 ms
with serial port
Inputs/outputs8 onboard digital user-programmable GPIOs
Analog channels0
Breakout boxSupported
Trigger modes4 modes
Strobe functionsYes

CE and RoHS Certification

Torus interfaces with a computer via the usB port and couples to our line of sMa 905-terminated optical fibers, light sources and accessories. spectrometer operation is as simple as installing spectrasuite spectroscopy software and then connecting the usB cable from the spectrometer to the computer. Wavelength calibration coefficients unique to each spectrometer are programmed into a memory chip right on the unit; the software simply reads these values from the spectrometer.

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Holographic Concave grating Design:

Reflective concave gratings are concave mirrors that disperse light; the concavity of the grating reflects and focuses the light and the grating groove pattern disperses the light. These aberration-corrected holographic concave gratings are known for their low stray light and high efficiency. The toroidal (the radius of curvature in the focusing and dispersion‚ directions are different) grating used in Torus further enhances the aberration correction and efficiency. For our visible Torus spectrometer, we use a variable line spacing grating with 550 (+/-2) grooves/mm groove density at center and a blaze wavelength of 400 nm. Blaze wavelength is the wavelength of maximum diffraction efficiency and depends on bench design and other considerations

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