Page 54 - Feed Lab
P. 54
Suguna Management System Ver 1.0 / SOP / FQL / P1 - 10 Page 1 of 3
10. NIR Analysis Procedure
FThe instrument should measure a sufficiently
Principle
large sample volume or surface to eliminate
The Indroduction of Near Infrared Technology is any significant influence of in homogeneity
based on reflectance of electromagnetic derived from chemical composition or physical
radiations in Near Infrared region (700 nm to properties of the test sample.
2500nm)by measuring the reflectance of C,H,N &
O at Molecular levels in samples which can be FThe sample path length (sample thickness) in
correlated by mathematical equations into transmittance measurements should be
percentage of relative nutrients in feeds and feed optimized according to the manufacturer's
stuffs. recommendation with respect to signal
intensity for obtaining linearity and maximum
signal/noise ratio.
Near-infrared (NIR) instruments
FNIR instruments are based on diffuse FIn reflectance measurements, a quartz window
reflectance or transmittance measurement in or other appropriate material to eliminate drying
the near infrared wavelength region of 700- effects should preferably cover the interacting
-1
2500 nm (14300-4000 cm ) or segments of
sample surface layer.
this or at selected wavelengths or wave
numbers. Calibration and initial validation
FThe optical principle may be dispersive (e.g. FThe instrument has to be calibrated before use.
grating monochromators) interferometric or
FThis procedure deals with calibrations that
non-thermal (e.g. light emitting diodes, laser
have been produced in-house or have been
diodes and lasers). The instrument should be
purchased from an external provider.
provided with a diagnostic test system for
testing photometric noise and repeatability, FThe calibration must have a sufficient number
wavelength/wave number accuracy and of representative samples, covering variations
wavelength/ wave number precision (for such as:
scanning spectrophotometers).
a) Combinations and composition ranges
Prepared by : Approved by :
44 Director - Technical
