Page
32
A Appendix
-
Measurement Modes
where
i
eff
effective intensity
î
peak intensity
i(t)
intensity
C
time constant, depending upon the level of adaptation
recommended values are
C = 0.1 s for day
-
time observation
C = 0.2 s for night
-
time observation
A.1.2
I
-
Effective (Blondel
-
Rey, BR)
A futher method to calculate the effective (luminious) intensity of a signal light
presented as a brief pulse is the
method
of Blondel
-
Rey
according to the fol-
lowing equation:
where
i
eff
effective intensity
i
(t)
intensity
t
pulse length
dt
t
i
C
î
dt
t
i
î
i
eff
)
(
)
(
t
dt
t
i
i
eff
2
.
0
)
(
