Cut Sheet

To maximize contrast, posion the lightest possible background to be used, at the closest posion it will come to the sensor during use.
Using a small screwdriver in the adjustment screw, adjust the cuto distance unl the threshold is reached and the green Light Sensed
indicator changes state. If the indicator never turns ON, the background is beyond the maximum sensing cuto and will be ignored.
Note the posion of the rotang cuto
posion indicator at this posion. Then repeat the procedure, using the darkest target, placed in
its most distant posion for sensing. Adjust the cuto so that the indicator is midway between the two posions.
Target Background
Cutoff
Distance
E
R2
R1
Figure 3. Set the cuto distance approximately midway between the
farthest target and the closest background
ON
OFF
DELAY
DELAY
DO
SIG
LO
RANGE
I
n
c
r
e
a
s
i
n
g
D
i
s
t
a
n
c
e
Set Cutoff Midway
Between
Farthest Target Object
Closest Background
Figure 4. Seng the cuto distance
Note: Seng the cuto distance adjustment screw to its maximum clockwise posion places the receiver lens
directly in front of the receiver elements and results in the Q60 performing as a long-range diuse sensor.
Sensing Reliability
For highest sensivity, the sensor-to-object distance should be such that the object will be sensed at or near the point of maximum
excess gain. The excess gain curves show excess gain versus sensing distance for 200 mm, 1200 mm, and 2 m cutos. Maximum excess
gain for a 200 mm
cuto occurs at a lens-to-object distance of about 150 mm, and for a 2 m cuto, at about 500 mm. The background
must be placed beyond the cuto distance. Following these two guidelines makes it possible to detect objects of low reecvity, even
against close-in reecve backgrounds.
Background Reecvity and Placement
Avoid mirror-like backgrounds that produce specular reecons. A false sensor response occurs if a background surface reects the
sensor's light more to the near detector (R1) than to the far detector (R2). The result is a false ON condion (Figure 5 on page
4).
Correct this problem by using a diusely reecve (mae) background, or angling either the sensor or the background (in any plane) so
the background does not reect light back to the sensor (Figure 6 on page 4). Posion the background as far beyond the cuto
distance as possible.
An object beyond the cuto distance, either staonary (and when posioned as shown in Figure 7 on page 5), or moving past the
face of the sensor in a direcon perpendicular to the sensing axis, may cause unwanted triggering of the sensor if more light is reected
to the near detector than to the far detector. Correct the problem by rotang the sensor 90° (Figure 8 on page 5). The object then
reects the R1 and R2 elds equally, resulng in no false triggering. A beer soluon, if possible, may be to reposion the object or the
sensor.
Cutoff
Distance
Reflective
Background
Sensing
Field
E
R2
R1
E = Emitter
R1
= Near Detector
R2 = Far Detector
Core of
Emitted
Beam
Strong
Direct
Reflection
to R1
Figure 5. Reecve Background - Problem
E
R2
R1
E = Emitter
R1
= Near Detector
R2 = Far Detector
Cutoff
Distance
Reflective
Background
Strong
Direct
Reflection
A
way From
Sensor
Sensing
Field
Core of
Emitted
Beam
Figure 6. Reecve Background - Soluon
Q60LAF Series Laser Adjustable-Field Sensors
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