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The S2000 Miniature
Fiber Optic Spectrometer from Ocean Optics was a low-cost, high-performance
spectrometer easily configured for thousands of UV-VIS-Shortwave NIR
applications from 200-1100 nm. The S2000 featured a high-sensitivity
linear CCD array that provided unusually high response and excellent
optical resolution in a miniature package.
Configuring the S2000 to work with external analog-to-digital
converters could sometimes be time consuming and complicated.
Several years ago we introduced USB-series spectrometers and the
S2000 ceased to be the most popular spectrometer choice.
See the
USB4000-series Plug-and-Play Spectrometer for details.
Miniature Optical Design
The S2000 features a familiar
optical design -- the crossed Czerny-Turner -- that has been reconfigured
for an optical bench small enough to fit into the palm of your hand. This
compact optical bench -- with no moving parts -- has a high-sensitivity
2048-element linear CCD-array detector that accepts light energy
transmitted through single-strand optical fiber and disperses it via a
fixed grating across the array. Despite its tiny size, the bench delivers
low stray light and high resolution, comparable to conventional 1/4-meter
monochromators.
The S2000 performance specifications
described here were achieved under the following conditions: The configuration
featured a 600 lines/mm grating (set for 300-950 nm), with a
tungsten-halogen light source for illumination and a 1000 µm optical fiber
for signal collection. The configuration did not include an entrance slit.
Integration times varied.
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Dimensions:
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141.6 mm
x 104.9 mm x 40.9 mm (with enclosure, master channel only)
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Weight:
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390 g (with
enclosure, master channel only)
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Power
consumption:
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110 mA @
5 VDC (master); 60 mA @ 5 VDC (slave)
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Detector
range:
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200-1100
nm
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Detector:
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2048-element
linear silicon CCD array
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Gratings:
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14 gratings: UV through Shortwave NIR
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Entrance
aperture:
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5, 10,
25, 50, 100 or 200 µm wide slits
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Order
sorting filters:
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Installed
bandpass and longpass filters
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Focal
length:
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42 mm
(input); 68 mm (output)
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Optical
resolution:
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~0.3-10.0 nm FWHM
(depending on grating and size of entrance aperture)
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Stray
light:
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<0.05% at 600 nm; <0.10% at 435
nm; <0.10% at 250 nm
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Dynamic range:
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2 x 10 8 (system); 2000:1
for a single scan
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Sensitivity
(estimated):
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86 photons/count; 2.9 x 10-17
joules/count; 2.9 x 10-17 watts/count (for 1-second
integration)
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Fiber optic
connector:
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SMA 905 to single-strand optical fiber
(0.22 NA)
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Integration time:
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3 milliseconds to 60 seconds with 1
MHz A/D card
2 milliseconds to 60 seconds with 2 MHz A/D card
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