TBF25 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.812385 n_e = 1.817524	V_d = 37.45 V_e = 37.20	n_F - n_C = 0.021691 n_F' - n_C' = 0.021975

Type: Resnik
Spectral range: 0.40466 - 2.6 mkm.
C1 = 0.028 C2 = 1.80781 C3 = 0.0332358 C4 = -0.0134343 C5 = -0.000706859 C6 = -0.000340525 C7 = 0.000800849 C8 = 0.00123287 C9 = -0.000819539 C10 = -0.00147654 C11 = 0.000433057

Refraction index
n _2.3254	1.764283
n _1.9701	1.771397
n _1.5296	1.779549
n _1.06	1.788873
n _t	1.790046
n _s	1.795208
n _r	1.802427
n _C	1.805985
n _C'	1.806992
n _0.6328	1.807936
n _D	1.812195
n _d	1.812385
n _e	1.817524
n _F	1.827676
n _F'	1.828968
n _g	1.840245
n _h	-----
n _i	-----
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7348
P_C,A'	0.3254
P_d,C	0.2950
P_e,C	0.5319
P_g,d	1.2844
P_g,F	0.5794
P_h,g	-----
P_i,g	-----
P_C',t	0.7812
P_e,C'	0.4855
P_F',e	0.5275
P_i,F'	-----

Density: 4.48 g/cm³
Optical stress coef.: 4.48 1/Pa*10¹²
Abrasion: 1.85

Climatic resistance: с
Resistance to acids: IV

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	55
0 ~ 30	59
20 ~ 120	66
20 ~ 300	76