Luminescent Si nanocrystals were prepared from rice husks and the optical properties and structure analysis were
studied. By the transmission electron microscope observation of the Si powder from rice husks, aggregates that are
composed of Si nanoparticles with crystalline structure were confirmed. Room temperature PL with near infrared-red
regions were observed from the Si nanocrystals. From the measurements of the PL decay curves, order of the life time
were sub-micro seconds and that depended on the wavelength of the luminescence. These results indicates that the origin
of the PL from Si nanocrystals made from rice husks is quantum size effect. Preparation of luminescent Si nanocrystals
from rice husks is an effective method for recycling rice husks.
The Fourier transform method is an analytical method for interferograms with a spatial linear carrier. Interferograms
with a spatial linear carrier are analyzed to obtain the phase, by eliminating the noise from the shape components of the
interferograms in the Fourier domain. However, when the noise and shape components overlap in the Fourier domain, it
is difficult to eliminate only the overlapped noise components using conventional filtering techniques, such as bandpass
filtering. Accordingly, a method is proposed to solve this problem using two interferograms with slightly different
carrier frequencies. In this method, the Fourier transforms of two interferograms with slightly different carrier
frequencies are separately calculated. Both of the spectra resulting from the Fourier transforms of the interferograms
contain the same noise components; however, the locations of these components differ slightly for the two spectra. By
subtracting the two Fourier spectra, the noise components are removed, and the main components are generated, because
the frequency difference between the two components is small. We have named the proposed method the “two-step
Fourier transpose method”. The validity of the proposed filtering method is confirmed by experiments in which two
color fringes are projected simultaneously onto a scatter object. Images of the color fringes are acquired via a CCD
camera under the slow deformation of the scatter object. The images are then analyzed via the proposed method.
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