Instructions

HD2402 - 40 - V1.3
if Alpha < 11mrad it is assumed that C
α
= 11
if L
R_11
≤ 5.45
•
10
5
⇒ t > 10s (j limit satisfied)
if 5.45
•
10
5
≤ L
R_11
≤ 8.08
•
10
7
⇒ t_lim = (4.54
•
10
6
/(L
R_11
))
4
[s] (k limit satis-
fied)
if 8.08
•
10
7
≤ L
R_real
⇒ t_lim < 10μs (limite l)
• Omega [sr], the solid angle under which the source is seen by the instrument in
steradians is supplied by the user.
o Alpha [rad] angle subtended by the source calculated starting from Omega solid
angle assuming that the source shape is circular:
Alpha = 2(Cos
-1
(1-Omega/2π))
o Omega [sr] solid angle subtended by the source.
o L
R
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
R
(11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
R
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s] exposure limit time, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure (all radiance values are expressed in [W m
-2
sr
-1
]):
if Alpha > 100mrad it is assumed that C
α
= 100
if L
R_real
≤ 6
•
10
4
⇒ t > 10s (j limit satisfied)
if 6
•
10
4
≤ L
R_real
≤ 8.89
•
10
6
⇒ t_lim = (5
•
10
5
/L
R_real
)
4
[s] (k limit satisfied)
if 8.89
•
10
6
≤ L
R_real
⇒ t_lim < 10μs (l limit)
if 11mrad < Alpha < 100mrad it is assumed that C
α
= Alpha
if L
R_real
≤ 6
•
10
6
/Alpha ⇒ t > 10s (j limit satisfied)
if 6
•
10
6
/Alpha ≤ L
R_real
≤ 8.89
•
10
8
/Alpha ⇒ t_lim = (5
•
10
7
/(L
R_real
•
Alpha))
4
[s]
(k limit satisfied)
if 8.89
•
10
8
/Alpha ≤ L
R_real
⇒ t_lim < 10μs (l limit)
if Alpha < 11mrad it is assumed that C
α
= 11
if L
R_11
≤ 5.45
•
10
5
⇒ t > 10s (j limit satisfied)
if 5.45
•
10
5
≤ L
R_11
≤ 8.08
•
10
7
⇒ t_lim = (4.54
•
10
6
/(L
R_11
))
4
[s] (k limit satis-
fied)
if 8.08
•
10
7
≤ L
R_real
⇒ t_lim < 10μs (l limit)
• Side d1 [m] - Side d2 [m] – Distance R [m]:
o Alpha_1 [rad] angle subtended by the source along side d1 (see following table).
o Alpha_2 [rad] angle subtended by the source along side d2 (see following table).