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PDF MQ-Wxxx Data sheet ( Hoja de datos )
| Número de pieza | MQ-Wxxx | |
| Descripción | Triple Beam Trigonometric Area Reflective Photoelectric Sensors | |
| Fabricantes | SunX | |
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MQ-W SERIES
Triple Beam Trigonometric
Area Reflective Photoelectric Sensors
Very accurate detection by triple beam triangulation sensing method in a compact package.
Environmental resistance
Immersion protected construction
(equivalent to IEC IP67)
High speed detection: Max. 2 ms
Light-ON/Dark-ON output is wire
selectable.
Operating voltage of 12 to 24 V DC
Adjuster and Indicators
Distance adjustment dial
Adjustment
indicator LED
(Comply with EMC directive MQ-W-EM type only)
* Original Sensor
FEATURES
Accurate detection regardless of
color, material, or shape of objects
Area reflective type sensor can detect
white or black object at the same dis-
tance. In case of diffuse reflective type,
it is difficult to detect objects of various
color with the same sensitivity setting.
MQ-W area reflective type sensor is
useful for such a case.
No-miss operation regardless of
back-grounds
Area reflective type sensor does not
detect objects beyond the set range.
Resistant to lens surface soiling
Area reflective type sensor detects the
distance by the angle, not the intensity
of received light. Even if the lens sur-
face is soiled by dust or any powdery
material, there is a little variation of
sensing range.
SENSING RANGES
0.03 .098
0.2 .656
Sensing range (m ft.)
MQ-W3 type
MW-W20 type
Distance adjustment dial
Operation
Indicator LED
Adjustment
indicator LED
MQ-W70 type
Operation
Indicator LED
0.7 2.297
MQ-W3 types
MQ-W20 types
MQ-W70 types
PRODUCT TYPE
Detection method
Range Rated operating voltage Control output Light source
Part number
*1 CE types
0.03 m .098 ft.
NPN
PNP
Infrared LED
Red LED
Infrared LED
Red LED
MQ-W3A-DC12-24V
MQ-W3AR-DC12-24V
MQ-W3C-DC12-24V
MQ-W3CR-DC12-24V
MQ-W3A-DC12-24VEM
MQ-W3AR-DC12-24VEM
MQ-W3C-DC12-24VEM
MQ-W3CR-DC12-24VEM
Triple beam area
reflective type
0.2 m .656 ft.
12 to 24 V DC
NPN
PNP
Infrared LED
Red LED
Infrared LED
Red LED
MQ-W20A-DC12-24V MQ-W20A-DC12-24VEM
MQ-W20AR-DC12-24V MQ-W20AR-DC12-24VEM
MQ-W20C-DC12-24V MQ-W20C-DC12-24VEM
MQ-W20CR-DC12-24V MQ-W20CR-DC12-24VEM
0.7 m 2.297 ft.
NPN
PNP
Infrared LED
MQ-W70A-DC12-24V MQ-W70A-DC12-24VEM
MQ-W70C-DC12-24V MQ-W70C-DC12-24VEM
*1 These suffix EM types conform to CE. These types have the grounding connection inside of housing
180
03/2003
1 page  
MQ-W
OPERATING PRINCIPLES
Detection principle of new triple beam area reflective series
$ Optical triangulation sensing method
The light beam projected by the LED,
passing through the condensing lens of
the light projector, is applied to the sur-
face of the target to be detected. One
part of the diffused reflected light rays
passes through the light receiver lens
producing a spot on the position sensi-
tive device. When the detectable target
is at a position A that is at a compara-
tively near distance as shown in Fig. 1,
a spot is produced at (a). When the tar-
get is at a position B that is far, a spot
is produced at (b). Accordingly, if any
spot position on the position sensitive
device is detected, the distance to the
target can be determined. This is the
principle of optical triangulation range
measurement.
Fig. 1 Optical triangulation range
measurement method
Other examples of this method are
the automatic focusing and camera
range measurement systems.
$ Triple beam type range sensing principle
The MQ photoelectric sensor area
reflective type has adapted this optical
triangulation range measurement prin-
ciple, but in order to improve the relia-
bility of the detection of the sensor, a
more elaborate method has been
devised. First, light receivers are posi-
tioned symmetrically on either side of
the axis of the light projector, compos-
ing a triple beam arrangement. As
shown in Fig. 2, when the moving
detectable target is at the edge of the
projected light beam, the spot reflected
from the target is at a location different
from the point where the spot is pro-
duced when the beam is completely
intercepted, generating a range mea-
surement difference of +∆X, but with
the triple beam composition, the sym-
metrically arranged position sensitive
device (2) has a spot produced con-
versely at a –∆X difference position,
and by means of averaging both range
measurement signals, the correct range
measurement can be made. This
results in significantly improved
repeatability and background suppres-
sion.
$ Optical system of the triple beam photoelectric sensor
In the MQ photoelectric sensor area
reflective type, it is necessary to give
special consideration to the lens. In
order to improve the precision, an
aspherical lens, having limited spherical
and coma aberration, is used.
In addition, as shown in Fig. 4, a photo
diode having 2 output terminals is used.
By comparing the output currents from
the 2 PSDs, there is no relationship to
the level of the incident light. Thus, the
ratio of reflection from the detectable
target exerts no influence and the
range measurement and detection can
be interpreted accuracy.
Fig. 3 Light beam trace of the lens
(a) is a spherical lens, and (b) is the
aspherical lens. Because there is no
aberration in (b), range measure-
ment precision is high.
Fig. 2 Triple beam range measure-
ment method
By averaging the range measure-
ment signals of the 2 light receiving
systems, the range measurement
difference is cancelled.
Fig. 4 PSD (position sensitive
device) construction
By making a calculation of the ratio
of I1 and I2, the light spot position
can be detected.
$ Operating principle of area reflective method
The operation of the MQ photoelectric
sensor area reflective type is explained
in Fig. 5. After the output from the 2
PSD elements is added, the I/V value is
converted and the logarithm deter-
mined. By subtraction, the distance sig-
nal in (I1/I2) is obtained. This can be
optionally set, and with the distance
adjustment control, comparison with the
produced value can be made to detect
whether the target is or is not within the
distance range.
Fig. 5 Signal processing circuit block diagram
184
03/2003
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