BF27 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.606822 n_e = 1.610099	V_d = 43.97 V_e = 43.68	n_F - n_C = 0.013798 n_F' - n_C' = 0.013967

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.60824 C3 = 0.0265342 C4 = -0.00899395 C5 = -0.000608504 C6 = -0.000297145 C7 = -0.0000289956 C8 = 0.0000258203 C9 = -0.0000196088 C10 = 0.0000231956 C11 = 0.000284342

Refraction index
n _2.3254	1.575636
n _1.9701	1.580327
n _1.5296	1.585552
n _1.06	1.591662
n _t	1.592434
n _s	1.595798
n _r	1.600447
n _C	1.602728
n _C'	1.603373
n _0.6328	1.603978
n _D	1.606701
n _d	1.606822
n _e	1.610099
n _F	1.616527
n _F'	1.617340
n _g	1.624392
n _h	1.631099
n _i	1.643093
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7460
P_C,A'	0.3283
P_d,C	0.2967
P_e,C	0.5341
P_g,d	1.2732
P_g,F	0.5699
P_h,g	0.4860
P_i,g	1.3552
P_C',t	0.7927
P_e,C'	0.4874
P_F',e	0.5247
P_i,F'	1.8663

Density: 3.46 g/cm³
Poisson coef.: 0.243
Young module: 687 Pa*10⁸
Optical stress coef.: 2.65 1/Pa*10¹²
Abrasion: 0.9

Climatic resistance: А
Resistance to acids: I

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	75
0 ~ 30	77
20 ~ 120	80
20 ~ 300	84