PBM18Y - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.595509 n_e = 1.599153	V_d = 38.76 V_e = 38.50	n_F - n_C = 0.015361 n_F' - n_C' = 0.015560	Coloring: 0.31 - 0.34 mkm.

Type: Sellmeier
Spectral range: 0.326 - 2.325 mkm.
C1 = 1.34660215 C2 = 0.136322343 C3 = 0.183371587 C4 = 0.0106313733 C5 = 0.0491403013 C6 = 23.9154655

Refraction index
n _2.3254	-----
n _1.9701	1.566156
n _1.5296	1.572294
n _1.06	1.578918
n _t	1.579746
n _s	1.583378
n _r	1.588460
n _C	1.590974
n _C'	1.591686
n _0.6328	1.592356
n _D	1.595374
n _d	1.595509
n _e	1.599153
n _F	1.606335
n _F'	1.607247
n _g	1.615198
n _h	1.622840
n _i	1.636558
n _0.3341	1.652584
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7309
P_C,A'	0.3242
P_d,C	0.2952
P_e,C	0.5324
P_g,d	1.2817
P_g,F	0.5769
P_h,g	0.4974
P_i,g	1.3905
P_C',t	0.7773
P_e,C'	0.4860
P_F',e	0.5269
P_i,F'	1.9081

transmittance: 10 mm
τ_0.32	0.22
τ_0.33	0.68
τ_0.34	0.912
τ_0.35	0.975
τ_0.36	0.99
τ_0.365	0.993
τ_0.37	0.995
τ_0.38	0.997
τ_0.39	0.998
τ_0.4	0.998
τ_0.42	0.998
τ_0.44	0.999
τ_0.46	0.999
τ_0.48	0.999
τ_0.5	0.999
τ_0.55	0.999
τ_0.6	0.999
τ_0.65	0.999
τ_0.7	0.999
τ_0.8	0.999
τ_0.9	0.999
τ₁	0.998
τ_1.2	0.998
τ_1.4	0.996
τ_1.6	0.994
τ_1.8	0.979
τ₂	0.956
τ_2.2	0.907
τ_2.4	0.87

Poisson coef.: 0.223
Rigidity: 244 Pa*10⁸
Young module: 598 Pa*10⁸
Knoop hardness: 410
Abrasion: 132

Climatic resistance: 2
Resistance to acids: 1
Phosphate resistance: 2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	88
100 ~ 300	100

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	t	2.5
-20 ~ 0	t	2.5
0 ~ 20	t	2.6
20 ~ 40	t	2.7
40 ~ 60	t	2.8
60 ~ 80	t	2.8
-40 ~ -20	C'	3.1
-20 ~ 0	C'	3.3
0 ~ 20	C'	3.4
20 ~ 40	C'	3.5
40 ~ 60	C'	3.6
60 ~ 80	C'	3.7
-40 ~ -20		3.2
-20 ~ 0		3.3
0 ~ 20		3.4
20 ~ 40		3.5
40 ~ 60		3.6
60 ~ 80		3.7
-40 ~ -20	D	3.4
-20 ~ 0	D	3.5
0 ~ 20	D	3.7
20 ~ 40	D	3.8
40 ~ 60	D	3.9
60 ~ 80	D	4
-40 ~ -20	e	3.7
-20 ~ 0	e	3.9
0 ~ 20	e	4
20 ~ 40	e	4.1
40 ~ 60	e	4.2
60 ~ 80	e	4.3
-40 ~ -20	F	4.4
-20 ~ 0	F	4.6
0 ~ 20	F	4.7
20 ~ 40	F	4.9
40 ~ 60	F	5
60 ~ 80	F	5.2
-40 ~ -20	g	5.2
-20 ~ 0	g	5.4
0 ~ 20	g	5.5
20 ~ 40	g	5.7
40 ~ 60	g	5.9
60 ~ 80	g	6.1
-40 ~ -20	i	7.6
-20 ~ 0	i	7.9
0 ~ 20	i	8.1
20 ~ 40	i	8.4
40 ~ 60	i	8.7
60 ~ 80	i	8.9