Buchi NIRFlex N-500 User Manual download pdf (Page 20)

4 Description of function

20 NIRFlex N-500 Operation Manual, Version F

Data processing and interferogram analysis

The NIR light interacts with the sample G material in different ways, leaving a characteristical ﬁnger-

print on the interferogram. At liquids the light is mostly transmitted and at solids reﬂected. The

remaining light is collected by the detector H. The built-in computer further processes the raw signal.

Process steps Result

Signal preprocessing Interferogram

Fourier transformation Raw spectrum

Signal background correction Spectrum of sample

Chemometric analysis of the spectral data Sample analysis

Display of the result via NIRWare Operator on the attached monitor Sample analysis is displayed

4.2 Measuring cells and their modes

The NIRFlex N-500 system is of modular design. The interferometer is located in the basic instrument.

Different measuring cell modules for different kinds of sample materials can be easily attached to the

basic intrument. To choose the best measuring cell for a speciﬁc range of samples the optical proper-

ties of the sample material must be know.

Measuring cell matrix

Sample characteristics

(for NIR light)

Section Measuring cell Typical application

Diffuse reﬂection 4.2.1 NIRFlex Solids;

NIRFlex Fiber Optic Solids;

NIRFlex Fiber Optic SMA*

Predominantly non-translucent

materials such as most tablets,

cereals and powders

Transmission 4.2.3 NIRFlex Liquids;

NIRFlex Fiber Optic Liquids

NIRFlex Fiber Optic SMA*

Translucent and transparent liquids

Diffuse transmission 4.2.4 NIRFlex Solids Transmittance Predominantly translucent solids

such as some tables, crystal

powders and other light conducting

materials

Transﬂectance 4.2.5 NIRFlex Fiber Optic Solids / NIRFlex

Solids with Transﬂectance Adapter;

NIRFlex Fiber Optic SMA*

Solids with weak diffuse reﬂection

and low transmission rate charac-

teristics

*Depending on the custom accessory

and measurement setup

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Buchi NIRFlex N-500 User Manual Page 20

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