NIR-Online GmbH
Product description | 3
Operation Manual Process Analyser PA2
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Product description
3.1
Description of function
The sensor is an optical instrument for nondestructive determination of substances
and concentrations in a sample.
A sample absorbs and reflects light across the entire wavelength spectrum according
to its color and chemical composition. The signal reflected by the sample is recorded
and analyzed by a spectrometer.
The sensor uses a lamp to produce near-infrared radiation that interacts with the
molecules of the sample. The interaction between sample and light produces a
characteristic spectrum.
The light reflected from the sample is collected through two sets of fiber optics that
direct the light to the NIR and visible spectrophotometers, respectively. The visible
spectrophotometer consists of a diffraction grating to spatially disperse the light ac-
cording to wavelength and a silicon photodiode array containing multiple elements
which measure the light intensity for specific wavelength intervals. The NIR spec-
trophtometer consists of a diffraction grating to spatially disperse the light accord-
ing to wavelength and an indium-gallium-arsenide photodiode array containing
multiple elements.
The measurement results produced are converted to data sequences.
The data sequences are transferred to a computer via an interface.
A computer program compares the data sequence curve with a calibration model
and in that way determines the chemical composition of the sample.
3.2
Configuration
3.2.1
Front view
1
2
3
Fig. 2: Front View
1
Measurement window
2
Flange
3
Heat sink
