S186ELD(Q) Laser Diode Emitter
3. Check the device alignment.
4. Tighten the mounting screws to secure the device (or the device and the bracket) in the aligned position.
Wiring Diagrams
Key
1 = Brown
2 = White
3 = Blue
4
Beam
Attenuator
4 = Black
+
1
3
10-30V dc
–
Note: Quick disconnect wiring diagrams are functionally identical.
Alignment
The beam size listed in Figure 1 on page 2 is also the effective beam size at the receiver. The effective beam is equal to the minimum opaque
object profile required to block the light beam. The beam size at the emitter is 2.5 mm (0.1 in) diameter.
Approx. 2.5 mm
Opposed Distance (X)
Beam Width (W)
Approx.
0.5mrad = 0.029°
1.5 m (5 ft)
3.0 m (10 ft)
6.1 m (20 ft)
15 m (50 ft)
30 m (100 ft)
4 mm (0.2 in)
5.5 mm (0.2 in)
8.5 mm (0.3 in)
18 mm (0.7 in)
32 mm (1.3 in)
Laser Emitter
W
Sensing Distance = X
W = 2.5 mm + 2X(tan.0029º) = 2.5 mm + X(0.001)
Figure 1. Laser emitter beam divergence at 25 °C (beam size vs. distance)
The effect of angular misalignment is dramatic (see Figure 2 on page 2). Laser emitters require the beam center to directly strike the receiver lens.
Figure 2 on page 2 shows how far the laser beam will miss the center of the receiver lens for each degree of angular misalignment. Note that even
at only a 1.5 m (5 ft) range, one degree of misalignment causes the laser beam to miss the lens of most receivers.
Tip: The visible red beam of the laser emitter is easily seen in subdued lighting. At opposed distances of up to 3 m (10 ft),
attach a sheet of white paper directly in front of the receiver lens. Mark the location of the lens center on the paper; use the
mark as an aiming target. Sight along the beam from directly behind the laser emitter. Adjust the emitter mounting until the red
image (the dot of red light) is centered exactly on the mark. Remove the paper and check the response of the receiver.
Ø = Misalignment Angle
Beam Displacement (Y) of 1° of
Misalignment
Opposed Distance (X)
Laser Emitter
Y
1.5 m (5 ft)
3.0 m (10 ft)
6.1 m (20 ft)
15 m (50 ft)
30 m (100 ft)
4 mm (0.2 in)
50 mm (2 in)
Sensing Distance = X
100 mm (4 in)
250 mm (10 in)
500 mm (20 in)
Y = X(tan Ø)
Figure 2. Beam Displacement per degree of misalignment
For longer distances (up to 7.6 m [25 ft]), replace the white paper with a 100 mm (4 in) × 100 mm (4 in) square of high-grade retroreflective tape
(Banner model BRT-THG-4X4-5 or equivalent; see Figure 3 on page 3). For greater distances, use a larger sheet of retroreflective material.
Note: Never use a mirror as an alignment target.
2
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