M-NBFD82 - Hoya

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.807777 n_e = 1.810410	V_d = 76.80 V_e = 78.95	n_F - n_C = 0.010517 n_F' - n_C' = 0.010264	Coloring: 0.35 - 0.42 mkm.

Type: Schott
Spectral range: 0.36501 - 1.014 mkm.
C1 = 3.1880263 C2 = -0.012178423 C3 = 0.037193076 C4 = -0.0028175309 C5 = 0.0000180448 C6 = -0.0000041829088

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.791375
n _s	1.795854
n _r	1.801451
n _C	1.803899
n _C'	1.804553
n _0.6328	1.805153
n _D	1.807672
n _d	1.807777
n _e	1.810410
n _F	1.814416
n _F'	1.814818
n _g	1.817373
n _h	1.818345
n _i	1.816918
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	1.1907
P_C,A'	0.4809
P_d,C	0.3687
P_e,C	0.6191
P_g,d	0.9124
P_g,F	0.2812
P_h,g	0.0923
P_i,g	-----
P_C',t	1.2530
P_e,C'	0.5568
P_F',e	0.4190
P_i,F'	0.1997

transmittance: 5 mm
τ_0.7	0.999
τ_0.65	0.998
τ_0.6	0.998
τ_0.55	0.998
τ_0.5	0.997
τ_0.48	0.995
τ_0.46	0.993
τ_0.44	0.99
τ_0.42	0.985
τ_0.4	0.97
τ_0.39	0.95
τ_0.38	0.9
τ_0.37	0.8
τ_0.36	0.57
τ_0.35	0.21

transmittance: 10 mm
τ_0.7	0.998
τ_0.65	0.997
τ_0.6	0.997
τ_0.55	0.997
τ_0.5	0.994
τ_0.48	0.991
τ_0.46	0.987
τ_0.44	0.981
τ_0.42	0.97
τ_0.4	0.94
τ_0.39	0.9
τ_0.38	0.81
τ_0.37	0.63
τ_0.36	0.33
τ_0.35	0.05

Poisson coef.: 0.292
Rigidity: 444 Pa*10⁸
Young module: 1149 Pa*10⁸
Knoop hardness: 615
Optical stress coef.: 1.95 1/Pa*10¹²
Abrasion: 80

Staining: 1
Resistance to acids: 4

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	59
100 ~ 300	77

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		2.9
-20 ~ 0		3.5
0 ~ 20		4
20 ~ 40		4.5
40 ~ 60		5
60 ~ 80		5.3

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		5.3
-20 ~ 0		5.6
0 ~ 20		5.8
20 ~ 40		6.1
40 ~ 60		6.4
60 ~ 80		6.6