diode array on line
TRANSCRIPT
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NIR Spectral Range
Near Infrared 780-2500 nm
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Why NIR Can Measure Chemical ConcentrationsNIR photons striking a molecule sometimes causes the molecule to take that photon and turn it into vibrations.We measure the loss of those photons to tell how many molecules of that type are present.Different molecules absorb photons of different wavelengths.
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An example of a spectrum. The red dots indicate measurement points of a discrete filter instrument.
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1100 1300 1460 1660 1740 1900 2060 2180 2260 2360
Moisture
ProteinOil/Fat
Original Spectrum
IndividualConstituent Absorption
Spectral response
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Inframatic Principle
Lamp Filter wheel
SphereDetectors
Window
Sample
Basic characteristics of Filter instruments:• Well-proven low-cost technology• Measures one wavelength after
another• Discrete wavelengths
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Scanning Monochromator
SampleScanning Grating
Single Detector
Diffuse Light from Sample
Basic characteristics of Scanning Monochromator:• Well-proven technology• Measures one wavelength after another• Complete spectra, not just discrete
wavelengths
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DA On-Line Principles of Operation
Diode A
rray
Sam
ple
Diffuse Light from Sample
Stationary Grating
White light from Sourceto the Sample
Turning Mirror
Primary lamp
Spare lamp
Sapphire Window
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Modern diode array technologyBasic characteristics
• Extreme sensitivity• No moving parts in
optics• Simultaneous data
collection at all wavelengths
• 300 spectra collected in 3 s.
These characteristics makes the DA technology especially suitable for On-Line measurements
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NIR – Applications in Process Industries
Until now majority of on-line analysers are filter based Our new offer includes on-line measurement using DA technology
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System MYRF – Whole grain Online measurement unitMeasured constituents
(wheat)• Protein
8.5% ... 18.5% ± 0.2% SEP
• Moisture8.5% ... 19.5%± 0.2% SEP
• Hardness• Sedimentation• Others…• 0-30 t/h capacity
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System MYRB – Flour/Semolina Online measurement unit
Measured constituents• Protein
8.5% ... 18.5% ± 0.2% SEP
• Moisture8.5% ... 19.5%± 0.2% SEP
• Ash0.3% ... 2.0% ± 0.2% SEP
• Water Absorption• Starch Damage • Others…• 1-2 t/h capacity
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Benefits with On-line TechnologyIncrease yield, reduce waste and optimise the use of raw material by :
• Automatic process control for:• Target optimisation• Consistent quality
– Ash– Gluten addition– Moisture
• Faster to target on start-up and grade changes
• Faster to target after grade changes• Continues surveillance for process changes
Tendency to run operation e.g. flour mill with less personnel
• No people at night shift or week-ends• Mill must automatically control itself. No-
one there to control it• QC and alarms for automatic shut-down
essential
Typical ROI € 150’-250’ / Year
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Perten DA On-line CameraThe On-line system is equipped with a 640*480 pixels RGB colour camera
Primarily used for Semolina speck count
Will show sieve breakage as an increase in specks
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Colour Measurement
L=89 a=1 b=9
L=84 a=1.5 b=20
L=81 a=2.5 b=30
L* is light to darka* is rednessb* is yellowness
Flour and semolina
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Live VideoUsed as a trouble-shooting toolCompare live image with reference picturesVery useful when verifying spec count measurementImage capture on demand or on events
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Lab & On-line Same TechnologyOn-line and lab instrument based on the same Diode Array technologyImproves agreement between lab and on-line resultsSimplifies calibration work and transfer of calibrationsReduces training requirements