Buchi NIR-Online X-Sential, Руководство по эксплуатации

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NIR-Online GmbH Product description | 3
Operation Manual X-Sential™ 9/34
3 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 according to wavelength and a silicon photodiode array containing multiple
elements which measure the light intensity for specific wavelength intervals. The
NIR spectrophtometer consists of a diffraction grating to spatially disperse the
light according to wavelength and an indium-gallium-arsenide photodiode array
containing multiple elements.
— The produced measurement results 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
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Fig. 2: Front View
1 Measurement window 2 Flange
3 Heat sink