Key Technologies of Measurement Traceability of Lovibond Color Scale

Fig. 1. Spectral transmittance diagrams. (a) Spectral transmittance diagram of red glasses; (b) spectral transmittance diagram of yellow glasses; (c) spectral transmittance diagram of blue glasses; (d) spectral transmittance diagram of neutra glasses

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Fig. 2. Relationship diagrams of $τ (λ)$ and Lovibond number. (a) $τ_{R} (λ)$ ; (b) $τ_{Y} (λ)$ ; (c) $τ_{B} (λ)$ ; (d) $τ_{N} (λ)$

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Fig. 3. Relationship diagrams of $A (λ)$ and Lovibond number. (a) $A_{R} (λ)$ ; (b) $A_{Y} (λ)$ ; (c) $A_{B} (λ)$ ; (d) $A_{N} (λ)$

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Fig. 4. Verification result diagrams. (a) Verification result diagram of red glasses; (b) verification result diagram of yellow glasses; (c) verification result diagram of blue glasses; (d) verification result diagram of neutral glasses

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Fig. 5. Verification result diagrams in small range. (a) Verification result diagram of red glasses; (b) verification result diagram of yellow glasses; (c) verification result diagram of blue glasses; (d) verification result diagram of neutral glasses

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Table 1. Color grading index of oil
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Table 1. Color grading index of oil
Length of cuvette /mm Level 1 Level 2 Level 3 Level 4
≤25.4 / / Y35 R4 Y35 R7
≤133.4 Y20 R2 Y35 R4 / /

Table 2. Spectral transmittance of red glasses

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Table 2. Spectral transmittance of red glasses

Wavelength λ /nm	Lovibond number /LU
Wavelength λ /nm	1	2	3	4	5	6	7	8	9	10
380	0.799	0.710	0.660	0.580	0.507	0.470	0.444	0.394	0.343	0.321
410	0.805	0.730	0.684	0.599	0.532	0.490	0.462	0.419	0.360	0.340
440	0.814	0.727	0.681	0.612	0.548	0.501	0.472	0.429	0.370	0.350
470	0.818	0.719	0.670	0.607	0.542	0.489	0.456	0.410	0.354	0.334
500	0.795	0.648	0.596	0.515	0.439	0.376	0.334	0.280	0.232	0.211
530	0.692	0.502	0.429	0.330	0.235	0.183	0.161	0.114	0.091	0.070
560	0.776	0.698	0.624	0.542	0.439	0.403	0.396	0.329	0.284	0.264
590	0.864	0.820	0.787	0.750	0.699	0.681	0.666	0.640	0.580	0.575
620	0.889	0.859	0.846	0.830	0.802	0.792	0.775	0.764	0.724	0.729
650	0.900	0.874	0.870	0.860	0.848	0.841	0.826	0.818	0.789	0.798
680	0.906	0.884	0.882	0.874	0.871	0.866	0.855	0.848	0.824	0.835
710	0.912	0.892	0.888	0.883	0.885	0.881	0.870	0.866	0.843	0.857
740	0.916	0.896	0.893	0.890	0.892	0.890	0.877	0.874	0.851	0.869
770	0.916	0.896	0.894	0.892	0.894	0.892	0.878	0.876	0.852	0.872

Table 3. Spectral transmittance of yellow glasses

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Table 3. Spectral transmittance of yellow glasses

Wavelength λ /nm	Lovibond number /LU
Wavelength λ /nm	1	2	3	4	5	6	7	8	9	10
380	0.026	0.003	0	0	0	0	0	0	0	0
410	0.280	0.141	0.056	0.031	0.013	0.010	0.007	0.001	0.001	0
440	0.600	0.434	0.297	0.226	0.154	0.108	0.084	0.045	0.041	0.032
470	0.789	0.710	0.645	0.577	0.517	0.457	0.416	0.374	0.329	0.293
500	0.864	0.834	0.815	0.791	0.774	0.736	0.717	0.688	0.663	0.642
530	0.885	0.870	0.868	0.863	0.853	0.835	0.828	0.793	0.804	0.790
560	0.892	0.885	0.885	0.879	0.874	0.859	0.864	0.828	0.841	0.837
590	0.889	0.881	0.882	0.873	0.870	0.855	0.851	0.822	0.825	0.821
620	0.884	0.872	0.872	0.861	0.852	0.838	0.825	0.803	0.792	0.782
650	0.880	0.870	0.864	0.849	0.842	0.824	0.810	0.791	0.775	0.760
680	0.889	0.872	0.868	0.849	0.850	0.829	0.819	0.807	0.795	0.777
710	0.910	0.880	0.879	0.859	0.866	0.843	0.835	0.829	0.811	0.790
740	0.916	0.887	0.888	0.872	0.882	0.865	0.854	0.852	0.843	0.824
770	0.916	0.889	0.890	0.875	0.886	0.873	0.862	0.858	0.855	0.834

Table 4. Characteristic wavelength
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Table 4. Characteristic wavelength
Glass Characteristic wavelength /nm
R 530
Y 480
B 540
N 480

Table 5. $A (λ)$ at characteristic wavelength

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Table 5. $A (λ)$ at characteristic wavelength

Feature point /LU	Characteristic wavelength /nm	Glass	A_L	A_S	$Δ A$
2	530	R	0.271	0.299	0.028
	480	Y	0.106	0.115	0.009
	540	B	0.187	0.201	0.014
4	530	R	0.492	0.481	0.011
	480	Y	0.168	0.170	0.002
	540	B	0.344	0.360	0.016
7	530	R	0.824	0.793	0.031
	480	Y	0.260	0.266	0.006
	540	B	0.579	0.569	0.010
20	530	R	2.260	2.301	0.041
	480	Y	0.662	0.680	0.018
	540	B	1.598	1.623	0.025

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Hongbo Gao, Qi Yuan, Rui Huang, Mengke Wang, Weiguo Zhao. Key Technologies of Measurement Traceability of Lovibond Color Scale[J]. Acta Optica Sinica, 2025, 45(3): 0333002

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