Lumber spectra

The spectra from sawn timber branches and from pure sawn timber without any
branches. All measurements were made by using four-mirror system in sample and
reference space where one mirror in sample space was replaced with a sample.
Backround corrections were made first by using a mirror instead of a sample in
sample space. So reflection from every samples were compared to a reflection from
a mirror (which were determined to one hundred percent). Filter were used in front
of reference beam to cut out 87.25 % because the specular reflectance from each
sample were originally lower than one percent. So every reflectance values are
relatively but anyway proportional to each other.

Measuring equipment: Perkin-Elmer lambda 9 UV/VIS/NIR spectrofotometer.

Wavelength interval: 380 nm - 2700 nm.

Wavelength resolution: 1 nm.

File formats: The available formats are ASCII and MATLAB(tm).

The file lumber380_2700_1.tar.gz consists of 8 ASCII files. In files *Wb.asc
there are spectra from sawn timber branches and in files *Wp.asc spectra
from pure sawn timber without any branches. All spectra in all *.asc files are
in the same column so that each spectra comprehend 2321 values from 380 nm to
2700 nm with one nanometer steps. So the first spectrum contains values from 1
to 2321, the second from 2322 to 4642 and so on. The numbers of spectra in the
files are following:

   pineWb.asc	51 
   pineWp.asc	44 
   spruceWb.asc 40 
   spruceWp.asc 35 
   aspenWb.asc	40 
   aspenWp.asc	38 
   birchWb.asc	12 
   birchWp.asc	12

The file lumber_matlab.tar.gz includes 8 MATLAB(tm) files named in the same manner
as ASCII files except the file extension ".asc" is replaced by the extension 
".mat". Each file consists of one matrix which name is the same as of the file and
the spectra are stored in column order in the matrices. The sizes of the matrices
are:

   pineWb 	2321x51
   pineWp 	2321x44
   spruceWb	2321x40
   spruceWp	2321x35
   aspenWb	2321x40
   aspenWp	2321x38
   birchWb	2321x12
   birchWp	2321x12

Measurer: jhiltu@fysnext.joensuu.fi

Further information: jhiltu@fysnext.joensuu.fi and haanpalo@lut.fi

References: 

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