BK3 - Sumita

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

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Main parameters
n_d = 1.498312 n_e = 1.500139	V_d = 65.12 V_e = 64.96	n_F - n_C = 0.007651 n_F' - n_C' = 0.007698	Coloring: 0.28 - 0.33 mkm.

Type: Schott
Spectral range: 0.3650146 - 1.01398 mkm.
C1 = 2.2178038 C2 = -0.010047625 C3 = 0.010237891 C4 = 0.0001133049 C5 = -0.00000073326462 C6 = 0.00000025769068

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.489139
n _s	1.491583
n _r	1.494573
n _C	1.495946
n _C'	1.496326
n _0.6328	1.496680
n _D	1.498244
n _d	1.498312
n _e	1.500139
n _F	1.503597
n _F'	1.504025
n _g	1.507655
n _h	1.510992
n _i	1.516639
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8896
P_C,A'	0.3632
P_d,C	0.3092
P_e,C	0.5480
P_g,d	1.2210
P_g,F	0.5302
P_h,g	0.4362
P_i,g	1.1742
P_C',t	0.9393
P_e,C'	0.4983
P_F',e	0.5078
P_i,F'	1.6486

transmittance: 10 mm
τ_0.28	0.037
τ_0.29	0.232
τ_0.3	0.516
τ_0.31	0.74
τ_0.32	0.868
τ_0.33	0.929
τ_0.34	0.964
τ_0.35	0.978
τ_0.36	0.985
τ_0.37	0.985
τ_0.38	0.985
τ_0.39	0.994
τ_0.4	0.992
τ_0.42	0.994
τ_0.44	0.994
τ_0.46	0.994
τ_0.48	0.995
τ_0.5	0.997
τ_0.55	0.997
τ_0.6	0.997
τ_0.65	0.998
τ_0.7	0.998
τ_0.8	0.998
τ_1.06	0.998
τ_1.5	0.985
τ₂	0.947

transmittance: 25 mm
τ_0.29	0.026
τ_0.3	0.192
τ_0.31	0.471
τ_0.32	0.702
τ_0.33	0.832
τ_0.34	0.913
τ_0.35	0.947
τ_0.36	0.964
τ_0.37	0.964
τ_0.38	0.964
τ_0.39	0.985
τ_0.4	0.982
τ_0.42	0.985
τ_0.44	0.985
τ_0.46	0.985
τ_0.48	0.989
τ_0.5	0.992
τ_0.55	0.992
τ_0.6	0.992
τ_0.65	0.996
τ_0.7	0.996
τ_0.8	0.996
τ_1.06	0.996
τ_1.5	0.964
τ₂	0.874

Poisson coef.: 0.22
Rigidity: 259 Pa*10⁸
Young module: 632 Pa*10⁸
Knoop hardness: 484
Abrasion: 100

Climatic resistance: 2
Resistance to acids: 4

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
100 ~ 300	65