Instructions

HD2402 - 32 - V1.3
o t_lim [s] exposure time limit, that is the time period during which the source can
be observed with no problems to the visual system. This value is calculated with
the following procedure:
if L
B_real
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha ≥ 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if 11mrad ≤ Alpha < 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha < 11mrad ⇒
otherwise t_lim = 10
6
/ L
B_11
• Diameter d [m] – Distance R [m]:
o Alpha [rad] angle subtended by the source.
o Omega [sr] solid angle subtended by the source.
o L
B
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
B
(11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
B
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 1.7mrad.
o L
B
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s]: exposure time limit, that is the time period during which the source
can be observed with no problems to the visual system. This value is calculated
with the following procedure:
if L
B_real
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha ≥ 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)