TORUS Low stray light

/ Spectrometers

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 research and OEM applications.

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.

Like most ocean optics spectrometers, 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.

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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Dimensions  149.9 mm x 119.4 mm x 63.5 mm (5.9 in. x 4.7 in. x 2.5 in.)
Weight  954 g (2.1 lb.)
Operating temperature  -10 to +50 °C
Detector type  Sony ilX511B
Detector range  200-1100 nm
Pixels  2048
Pixel well depth  ~62,500 e-
 Optical Bench
 Design  Flat field
 Focal length  85 mm
 Entrance aperture  25 μm or 50 μm wide slit or fiber with user-selectable aperture (tested at F3 and F4)
 Gratings  Toroidal concave holographic (blazed @ 400 nm)
 Mechanical interface  8-32 threaded holes at base (3 places)
 Optical input interface  SMA 905 fiber connector and C-mount lens adapter
 Wavelength range  360-825 nm
 Optical resolution  ≤2.0 nm FwhM over the spectral range
 Signal-to-noise ratio  250:1 (at full signal)
 A/D resolution  16 bits
 Dark noise  50 rMs counts, 300 counts peak to peak
 Dynamic range  8.5 x 107 (system); 1300:1 (single acquisition)
 Integration time  1 ms-65 s
 Stray light  0.015% @ 400 nm
 Corrected linearity  ≥99%
 Thermal stability  ≤0.025 nm/ °C (wavelength stability)
Power consumption  250 ma @ 5 vDC
Power options  USB or GPIO port
Data transfer speed  Full spectrum every 1 ms with USB 2.0 port, 15 ms with USB 1.1 port, 200 ms with serial port
Connector  USB or GPIO port
Inputs/outputs  Yes, 8 onboard digital user-programmable GPIOs
Analog channels  0
Breakout box  Supported
Trigger modes  4 modes
Strobe functions  Yes
 Computer Requirements
Computer interface  USB 2.0, rs-232
Operating systems  Any supported by omniDriver/seaBreeze or rs-232
 CE mark  Yes
 RoHS  Yes
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Torus works well for applications where low stray light, high throughput and great thermal stability are necessary. Here are some examples:

  • Trace gas amounts in the atmosphere
  • Absorbance of optically dense solutions (the smaller the amount of stray light present, the higher the absorbance values that can be measured)
  • Precision measurement of leDs, lasers and other light sources
  • Medical dosimetry in tissue and biological media
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Next generation of high-value Miniature spectrometers

Torus is the first of a new line of ocean optics spectrometers distinguished by scientific-grade spectral performance in the compact, flexible bench design that is our hallmark.

Like our flagship usB2000+ spectrometer, Torus uses a sony ilX511B linear CCD-array detector. however, the Torus debuts a novel flat field optical bench design. The Torus has the same robust, high-speed electronics made popular by the usB2000+, but with improved throughput and less stray light due to the aberration- corrected toroidal grating.

What’s more, Torus has good thermal stability-wavelength drift is mitigated and peak shape stays the same over a wide temperature range. as a result, Torus makes possible precision metrology, fluorescence and absorbance applications with demanding stray light and thermal stability requirements.

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