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
|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|
|Pixel well depth||~62,500 e-|
|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|
|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|
|Trigger modes||4 modes|
|Computer interface||USB 2.0, rs-232|
|Operating systems||Any supported by omniDriver/seaBreeze or rs-232|
Torus works well for applications where low stray light, high throughput and great thermal stability are necessary. Here are some examples:
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.