How does it works?
The
ARCspectro HT series is
static (so no moving scanning parts)
FTS based on a
so-called common path polarization interferometer. The hart of Arcspectro HT is
a monolithic bloc constituted of high-end crystal prisms and polarizers that are
transparent over a very large spectral band (UV-VIS-NIR). The spectral dependent
intensity pattern (interference pattern) created at the output of the bloc is
recorded with a CCD detector array and the spectrum is calculated by the
computer via a Fourier transform algorithm and calibration tables.
The diffusing light (over a
diameter of 4mm) can directly enter the device and so
it does not need to pass trough a narrow entrance slit (generally of 25mm for an
equivalent resolution and comparable acceptance angles) as for the conventional
commercially available grating spectrometers. This explains the tremendous
throughput advantage (between 50 and 100x more!) of the ARCSpectro-HT.
Notice also that fiber and collimation optics are not absolutely necessary,
this may be an advantage for certain applications where
cumbersome and lossy optics are not desired.
Compared with a conventional grating
Spectrometer?
Compared to conventional grating spectrometers, The arcspectro-HT (and all the
other FT spectrometerrs) has many advantages. The most important is its a
high resolution (0.7 nm @ 500nm) for a broad
wavelength range (400nm-1050nm or 900-1700nm) and for an entrance
aperture of 4mm!!! Also FTS
do not need second and third order rejection filters on the detector which
causes spectral distortions and absorptions.
Another important advantage the
arcspectro-HT is the simplicity of the optical setup:
The user can directly illuminate the 4mm entrance window
with the light to be
spectrally analyzed.
There is no need for cumbersome and expensive optics for coupling the light into
a small optical fiber as it is the case for conventional grating spectrometers.
Also, if necessary, the light
can be
directly injected in the
arcspectro-HT
via a thick
light guide that
is connected to the entrance.
Some application
examples:
-
Raman spectroscopy
-
fluorescence detection
- Diffuse Reflection
-
Dynamic
processes analysis
|
-
Reflectance measurement
-
Colorimetry
- Gas
detection
- Diffusing sources
|
Software
The ARCspectro
HT series is delivered with a free windows XP,W7, compatible program.
The software recognize automatically the spectrometer (USB plug and play system)
and
is able as other conventional spectrometer software to:
- Display
real time spectral measurement results
- Configure
measurement parameters (integration time, averaging).
- Choose
Transmission or Reflection mode
- Usual
features such as save, open, zoom, rescale...
- Some
specific features related to Fourier transform spectrometry:
choose apodization (automatic recognition option), look and
save the interferograms.
On demand application specific features can be implemented
in the program within a few weeks.
Accessories:
The ARCspectro HT
is available with four different "light inputs" possibilities depending of the
application and the type of light source to be analyzed:
- Glass
window: The spectrometer module can directly be placed in
front of an extended diffusing source or for a point source.
This solution presents minimal losses when looking with
diffusing sources
- Diffusing
window: One can directly shine onto the diffusing plate. This
solution is ideal for collimated sources
- Single
branch light guide: Ideal when the source is not directly
accessible.
- Dual
branch light guide: Ideal for reflection measurements
ARCspectro
