Banner PC44 Series - Manual (Page 3)

3
Diffuse
fiber optic sensing mode
Diffuse mode sensing utilizes bifurcated (PB Series) fibers.
These are paired fibers, one of which carries the light from the
emitter element to the sensing point, while the other carries the
light (reflected from the sensed object) from the sensing point
back to the receiver element.
The curves (right) show typical performance of a PC44 module
fitted with a model PBT46U fiber assembly in the diffuse
sensing mode. Diffuse mode sensing range is referenced to a
white test card of 90% reflectance. Less reflective objects will
shorten the sensing range.
Standard models of PB Series bifurcated plastic fiber optic
assemblies are included in the list at the bottom of page 4.
Banner Engineering Corp. can custom-design plastic fibers to suit the requirements of your particular application. Contact one
of our application engineers by telephone or FAX for a quote on your design.
Beam Pattern
Beam Pattern Beam Pattern
In opposed mode sensing, emitter and receiver fiber optics are
set up opposite (and facing) each other, and the object to be
detected passes between the fiber optic sensing tips and breaks
the light beam. Two individual (PI Series) fiber optic assem-
blies are required: one to carry the emitted light and the other to
carry the received light. The curves (above left) show typical
opposed mode performance of a PC44 module fitted with two
PIT46U fibers in the opposed sensing mode.
Opposed mode sensing range may be extended by using lenses
on both emitter and receiver fibers. The curves (above right)
show the typical performance of PIT46U fibers fitted with L2
lenses. L2RA (right-angled) prisms may be used with threaded-
tip fibers to provide sensing at right angles to the fiber tips,
although at somewhat reduced sensing range compared to
unlensed fibers.
Standard models of PI Series individual plastic fiber optic assemblies are included in the list at the bottom of page 4.
Banner Engineering Corp. can custom-design plastic fibers to suit the requirements of your particular application. Contact one
of our application engineers by telephone or FAX for a quote on your design.
L2 lens for extended range operation with opposed mode fibers.
Use with PIT46U or PIT46UC. See sensor excess gain curves
for range information. L2RA (not shown)
provides right-angle sensing at
somewhat reduced range.
.11 Ø glass lens
2,8
M2.5 x 0,45
internal thread
.16 Ø
3,8
.365
9,3
L2 and L2RA
Excess Gain Curve Excess Gain Curve
Excess Gain Curve
Opposed
fiber optic sensing mode
1
10
100
10 mm
0.4 in
100 mm
4 in
1000 mm
40 in
1 mm
0.04 in
1000
E
X
C
E
S
S
G
A
I
N
DISTANCE
PC44
Opposed Mode
PIT46U Fibers
2.5 m
100 in
2 m
80 in
1.5 m
60 in
1 m
40 in
.5 m
20 in
0
0
50 mm
100 mm
150 mm
50 mm
100 mm
150 mm
0
2 in
4 in
6 in
2 in
4 in
6 in
DISTANCE
PC44, .040" fibers
Opposed mode, L2 lenses
62.5 mm
2.5 in
50 mm
2.0 in
37.5 mm
1.5 in
25 mm
1.0 in
12.5 mm
0.5 in
0
0
2.5 mm
5 mm
7.5 mm
2.5 mm
5 mm
7.5 mm
0
0.1 in
0.2 in
0.3 in
0.1 in
0.2 in
0.3 in
DISTANCE
PC44
Diffuse Mode
PBT46U Fiber
1
10
100
1 mm
0.04 in
10 mm
0.4 in
100 mm
4 in
0.1 mm
0.004 in
1000
E
X
C
E
S
S
G
A
I
N
DISTANCE
PC44
Diffuse Mode
PBT46U Fiber
Distance to 90% reflectance white test card
1
10
100
100 mm
4 in
1 m
40 in
10 m
400 in
10 mm
0.4 in
1000
E
X
C
E
S
S
G
A
I
N
DISTANCE
PC44
Opposed Mode,
PIT46U (.040") fibers,
L2 lenses
250 mm
10 in
200 mm
8 in
150 mm
6 in
100 mm
4 in
50 mm
2 in
0
0
13 mm
25 mm
38 mm
13 mm
25 mm
38 mm
0
0.5 in
1.0 in
1.5 in
0.5 in
1.0 in
1.5 in
DISTANCE
PC44
Opposed Mode
PIT46U Fibers