BF24 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.634551 n_e = 1.638642	V_d = 36.76 V_e = 36.49	n_F - n_C = 0.017257 n_F' - n_C' = 0.017497

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.63646 C3 = 0.0334305 C4 = -0.0094267 C5 = 0.000263039 C6 = -0.000153263 C7 = 0.000018366 C8 = -0.000872581 C9 = 0.000763663 C10 = 0.000780044 C11 = -0.000469046

Refraction index
n _2.3254	1.599009
n _1.9701	1.603924
n _1.5296	1.609388
n _1.06	1.616254
n _t	1.617153
n _s	1.621118
n _r	1.626704
n _C	1.629490
n _C'	1.630283
n _0.6328	1.631027
n _D	1.634400
n _d	1.634551
n _e	1.638642
n _F	1.646748
n _F'	1.647780
n _g	1.656802
n _h	1.665536
n _i	1.681390
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7148
P_C,A'	0.3190
P_d,C	0.2932
P_e,C	0.5303
P_g,d	1.2893
P_g,F	0.5825
P_h,g	0.5061
P_i,g	1.4247
P_C',t	0.7607
P_e,C'	0.4844
P_F',e	0.5294
P_i,F'	1.9475

Density: 3.67 g/cm³
Poisson coef.: 0.234
Rigidity: 255.3 Pa*10⁸
Young module: 630.1 Pa*10⁸
Optical stress coef.: 2.65 1/Pa*10¹²
Abrasion: 0.7

Climatic resistance: А
Resistance to acids: I

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	74
0 ~ 30	76
20 ~ 120	79
20 ~ 300	84

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	4.2
-60 ~ 20	e	3.5
-60 ~ 20	D	3.2
-60 ~ 20	C	2.8
20 ~ 120	F	6.4
20 ~ 120	e	5.6
20 ~ 120	D	5.2
20 ~ 120	C	4.9