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OBA measurement - instrument comparison experiment
November 28, 2022
OBA measurement - instrument comparison experiment
In this experiment, the T42* substrate that contains OBAs is measured with a number of different Instruments. The following table compares the differences between these measurement devices related to measuring samples with OBAs:
| Instrument |
OBA Index |
Fluorescence Index |
M1-M2 Spectral ∆ @ 430 nm |
M1-M2 ∆E00 |
| i1 Pro 3 | 8.8 | 9.5 | 0.24@ 430 nm | 8.71 |
| i1 Pro 2 | 7.2 | 7.4 | 0.21@ 430 nm | 7.24 |
| eXact (v.1) M1 Part 2 export on | 5.8 | 5.8 | 0.16 @ 430 nm | 5.72 |
| eXact(v.1) M1 Part 2 export off | 6.2 | 5.9 | 0.15 @ 430 nm | 6.08 |
| Techkon SpectroDens | 7.9 | 7.4 | 0.16 @ 440 nmn | 7.25 |
| NIX Spectro 2 | soon |
A fast visual comparison of spectral curves explains why numbers are very different.
| Instrument | Reflective Spectrum (M1, M0, M2) |
| i1 Pro 3 |  |
| i1 Pro 2 |  |
| eXact M1 Part 2 export on |  |
| eXact M1 Part 2 export off |  |
| Techkon SpectroDens |  |
| NIX Spectro 2 | soon |
| Instrument | Fluorescent Effect (M1-M2) |
| i1 Pro 3 |  |
| i1 Pro 2 |  |
| eXact M1 Part 2 export on |  |
| eXact M1 Part 2 export off |  |
| Techkon SpectroDens v4 |  |
| NIX Spectro 2 | soon |
Some of the differences between instruments are due to measurement devices measuring different spectral ranges, but the most critical difference is due to differences in their Light source (illuminants) and monochromator.
| Instrument | Light Source |
Monochromator Detector |
Comments |
| i1 Pro 3 | Full-Spectrum LED | diffraction grating 128-pixel diode array |
|
| i1 Pro 2 | Gas-filled tungsten (illuminant A) and UV LED |
diffraction grating |
|
| eXact | Gas-filled tungsten (illuminant A) and UV LED |
DRS spectral engine |
Two different calibrations for simultaneous M-condition measurement. M1 (part 1), M1 (part 2) |
| Techkon SpectroDens v4 | Full-Spectrum LED | diffraction grating | |
| NIX Spectro 2 | Full-Spectrum LED | diffraction grating |
Additionally. eXact in version 1 has two modes (M1 Part 2 Export on or off)
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