UV-VIS Spectrometer Models
miniature fiber optic spectrometers with concave gratings deliver high
performance for spectroscopy
applications in the UV-VIS wavelength ranges covering
or optionally 280-900nm
(model CXR). The
instruments are exceptionally robust with no moving parts, and are
packaged in small rugged metal enclosures (2.75 x4 x6 inch) for portable
spectroradiometry and lab or process spectroscopy measurements. The
BLACK-Comet UV-VIS spectrometers
utilize a 40mm diameter concave grating with aberration correction to
provide superb spectral imaging. This significantly improves spectral
shapes by reducing comma and astigmatism found in plane grating
spectrograph designs. The spectrograph
architecture does not utilize mirrors, and therefore provides the lowest
possible stray light in the UV with additional assistance from the
holographic line grating. The concave grating
produces a flat field on the CCD detector creating uniform resolution
over the entire range.
Optical Metrology and Colorimetry
UV-VIS spectrometer model CXR-25
(-25 denotes slit size) measuring the transmission of a
blue plastic film using a
tungsten halogen lamp,
transmission fixture, and two
providing colorimetric data in CIELAB color space. Go to the
measuring solar irradiance. The dual blaze concave grating allows for
superb spectral imaging from 220-1100nm.
Spectral sensitivity is one of the most
important factors in choosing the proper miniature spectrometer. The
concave grating optical design allows for high sensitivity and a smooth
spectral distribution over the wavelength range as shown in the above
spectrum of a Tungsten Halogen lamp.
UV-VIS Absorbance System
StellarNet’s Low Cost UV-VIS Spectrometer system is
composed of the BLACK-Comet research grade concave
grating spectrometer, a SL5 high stability light source with
integrated cuvette holder, and an optical coupling fiber. Above
is the absorbance spectrum of various sugars.
concave grating spectrometer for LED measurement capturing spectrum
of Nichia White LED (190-850nm or 280-900nm). SpectraWiz
software displays 1931 CIE Chromaticity Diagram with xy chromaticity
values within .001 of LED specifications. Also displayed is
LED dominant wavelength, purity value XYZ tri-stimulus values.
SpectraWiz software allows the user to save samples, log data,
auto-scale, and take dark references.
Why Concave Gratings are the Best!!!
One of the main advantages of the BLACK-Comet is its ability to drastically
reduce straylight levels, 0.02% at 435 nm and 0.2% at 200 nm, the lowest
values of any field spectrometer. By design, the holographic grating has
a smoother surface than the normal ruled gratings used in competing
spectrometer models. Surface roughness is the primary source of grating
generated stray light and thus by employing superior grating technology,
StellarNet’s Concave Grating Spectrometers are able to drastically
reduce the effect. Additionally, grating scatter in the standard Czerny
Turner design is collected and focused by the focusing mirror toward the
exit port, this does not occur with the BLACK-Comet. When additional
optical components like collimating and focusing mirrors are used in
instrument design, it is more likely that light may be re-diffracted and
due to the spectrometers ability to reduce light scatter, especially
high power UV light, the Concave Grating spectrometer provides two to
three times enhanced UV sensitivity as compared to plane grating/Czerny
Turner optical configurations.
The units are ruggedized. As
shown above the detector is bolted in position and military grade epoxy
holds the concave grating in place making the instruments vibration
tolerant, durable, and suitable for just about any lab and/or field
measurement. A multi-band filter is integrated into the
spectrograph to provide order sorting and prevent optical aliasing. The
instruments optical input is attached via standard SMA-905 connector,
using single strand fiber optic cable with typical silica core diameters
of 400um, 600um, 1000um.
BLACK-Comet measuring the reflectance of roasted
peanuts from 280-900nm. CIE lab color data can logged in real time.
StellarNet colorimetry systems include a configured spectrometer, light
source, reflectance fixture or probe and other sampling accessories.
Several units may be daisy
chained via a USB-2 hub allowing simple configurations
for dual and multi-beam process applications.
Free SpectraWiz Software
The powerful SpectraWiz® 32
bit spectrometer software is provided free of charge
with every spectrometer instrument. This includes
drivers and customizable software for operation on
The SpectraWiz software is considered the "Swiss Army Knife of
Spectroscopy and may be used to accurately measure wavelength emissions,
reflectance, transmission, absorption, concentrations, and absolute
intensities. In addition to real-time spectroscopy,
SpectraWiz® has built-in applications for SpectroRadiometry,
SpectroColorimetry, ChemWiz chemistry lab concentration analyzer, and UV
Super Ranges (200-1100nm)
StellarNet has released super range concave grating spectrometers,
BLACK-Comet-SR. The grating uses an
enhanced Dual Blaze technology to extend the concave grating models
range to 1100nm.
See more at
High Resolutions (<0.4nm)
StellarNet has just released
high resolution concave grating spectrometers, BLACK-Comet-HR. The new
models come in a UV (200-600nm) and VIS (380-750nm) range with
resolutions down to 0.4nm.
See more at
The system includes a high speed plug & play interface using USB-2