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June 20, 2023

NiX Spectro 1 in-depth

Calibration Tile —  Fluorescent Effect

This test shows that OBA Index has a negative value, Fluorescent Index is 0.6, which is not expected as most calibration standards have no OBAs and FI =0

Fluorescent effect points 680 nm,  fluorescence curve is not smooth - that is showing a kind of data processing that is not optimized on the self-calibration tile.

 

BCRA White Tile —  Fluorescent Effect

To eliminate the problem of the unknown instrument's white standard, a White BRCA from Lucideon is used for a deeper evaluation.

 

This test proves the hypothesis.  White BRCA has OBA Index = 0, Fluorescent Index = 0, spectral curves are identical for all M-conditions and are very smooth.  NIX produces some unexpected differences for all M-conditions.

This instrument is not recommended for paper measurements to detect OBAs

 

Short-term repeatability: 9 measurements of white calibration tile.

This test has been repeated a couple of times.

  1 2 3 4
95 percentile M0 0.25 0.23  0.24  0.12
95 percentile M1 0.19 0.31  0.24  0.18
95 percentile M2 0.19 0.17  0.19  0.10
max error M0 0.27 0.24 0.29 0.17
max error M1 0.19 0.35 0.27 0.23
max error M2 0.19 0.18 0.24 0.15
average error M0 0.12 0.11 0.11 0.06
average error M1 0.09 0.14 0.12 0.10
average error M2 0.09 0.09 0.09 0.05

 This test shows that M2 measurements are more stable than M0 or M1.  As the number is not very small, we decided to make another test with more samples.

 

Short-term repeatability: 100 measurements of white calibration tile.

All Variation analysis shows results that can show an average value of around 0.10, which can be expressed as ±0.05 and is what the manufacturer declares. 

 

Short-term repeatability: 9 measurements of Black BCRA

This test has been repeated a couple of times.

  1 2 3 4 5
95 percentile M0 0.26 0.33 0.32  0.21 0.27
95 percentile M1 0.45  1.20 0.75 0.52 0.77
95 percentile M2 0.23 0.25 0.23  0.29 0.36
max error M0 0.35 0.37 0.37 0.23 0.33
max error M1 0.50 1.26  0.80 0.61 0.89
max error M2 0.30  0.38 0.38 0.31 0.43
average error M0 0.15 0.19 0.20 0.13 0.17
average error M1 0.23  0.52 0.35  0.23 0.38
average error M2 0.14  0.16 0.14 0.16 0.19 

Generally, a Black sample produces much higher variations. It is essential to understand that no manufacturer is declaring short-term repeatability on Black. 

Accuracy for black is for all instruments lower than for white

 

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