Separation of the threshed grain through the
concave grating can be increased two-fold (on average) using the experimental concave (Fig.
A meniscus lens is added before the
concave grating to correct the aberration brought by the separation at the same time, as is shown in Figure 6.
Baets, "Planar
concave grating demultiplexer fabricated on a nanophotonic silicon-on-insulator platform," IEEE Photon.
This 16-bit
concave grating spectrometer is USB-2 powered, shock-proof and vibration tolerant with no moving parts.
The investigation showed that there was no significant difference in the proportion of impurities that fell through the
concave grating (Table 1) regardless of the shape of the threshing cylinder's spaces between the rasp bars.
However, RCWA cannot be used to simulate the imaging of a
concave grating in the large free propagation region.
This 16-bit
concave grating spectrometer is USB-2 powered, shock-proof and vibration tolerant with no moving parts and includes the powerful SpectraWiz spectrometer software and development kit.
Previous studies have demonstrated that the variable radius concave improves the efficiency of corn grain separation through the
concave grating by 2.5 [9].
The CXR-FS system comprises a miniature fiber optically coupled, thermo electrically cooled (TEC) UV-Vis spectrometer with
concave grating, an LED-based excitation source, and a dual-read cuvette sample holder.
The BP1 can also be used to concurrently power a proprietary EPP2000C
concave grating UV-VIS spectrometer and obtain a complete UV-VIS-NIR spectrum.
The concluded TRP Advanced large FOV UV/VIS/NIR/SWIR spectrometers has identified high efficiency reflective
concave gratings working over a large band as a key technology to enable the manufacturing of instruments that encompass the performances of OLCI in terms of optical quality spatial resolution and compactness.
Technical Data Additional characteristics Focal length 200 mm Primary slit width 15 [micro]m Detector Tri-linear CCD with 3 x 8640 pixels per spectrograph Pixels Photo-diode 7 x 9.8 [micro]m at 7 [micro]m pitch Gratings Aberration corrected
concave gratings with 590, 1105 and 3240 gr/mm at grating centre Average 8, 24 and 43 pm/pixel for the spectrographs covering the ranges 129-200, 200-410 and 410-780 nm, respectively Sample stand Argon flushed, water-cooled table with self-contained, closed loop coolant system Software WinOE THERMO ELECTRON CORPORATION (THERMO ARL) En Vallaire Quest C, case postale CH- 1024 Ecublens, Switzerland +41 21 694 7111 www.thermo.com/arl Table 1.
