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User Manual | AURA handheld NIR – 2289-971 and 2298-955
Application note
AURA handheld NIR
5 Application note
How to obtain reliable and reproducible measurements
with the AURA handheld NIR
The AURA handheld NIR is a battery operated, hand-held, diffuse reflection
NIR spectrometer for measuring constituents of solid samples in direct
contact. It is also used for displaying and storing results and related data.
The AURA handheld NIR has a measuring window diameter of 38 mm.
Due to the optical layout, a measuring spot of 13.5 mm is realized, which
lies in the middle of the measuring window.
Sample presentation
The solid samples can be in the form of powder or meal or can be pasty or
chunky. For a representative measurement of the sample, an appropriate
sample presentation must be ensured. Consistent pressure during
continuous and single scans is a prerequisite for good repeatability of the
measurement results. By a suitable choice of a sample container, e.g.
a bowl or a box, the sample can be ideally prepared for measurement.
Sample thickness in a sample container
Light in the wavelength range of NIR is penetrating the sample in a
depth of several millimeters. Enough sample thickness in the sample
container must therefore be ensured to avoid undesired reflection of the
background of the sample container and thus a negative influence on the
measurement result.
