3
Detection territory definition
Assume focal length is 6 mm (f=6mm)
，
tilt depression angle
θ
1
is 30°, camera
installation height is 4m
。
Viewable angle estimation
Camera viewable angel
θ
(degree)= 2 tan
-1
(D/2f)
D (mm) = CCD (horizontal, vertical, or diagonal)
f (mm) = Camera focal length
Calculate horizontal viewable angle is 43.6
°
, vertical viewable angle is 33.4
°
Detection nearest limit / dead angle estimation
CCD
3
1
′′
，
Width 4.8mm × Height 3.6 mm
Camera vertical viewable angel
θ
2
(degree)= 2 tan
-1
(D
v
/2f)
D (mm) = CCD
尺寸
(horizontal, vertical, or diagonal)
f (mm) = Camera focal length
3
1
′′
CCD size (Width 4.8mm × Height 3.6 mm) Vertical viewable angle
θ
2
為
33.4
°
Dead angle distance L
1
= H
c
/ [tan(
θ
1
+
θ
2
/ 2)] = 4 m/ Tan(46.7
°
) = 3.77 m
Real flame reflection height
Dead Angle
