Omron B5WC - 4 Product Features; Munsell color detection capacity; Sensing distance stability

7 B5WC Built- In Color Sensor User's Manual (E612- E1- 01)
4 Product Features
The color sensor is a type of reflective optical sensor that detects the color of the sensed object by the
received R/G/B light intensity. These received RGB light measurements allows judgment of the color of
sensed objects.
Shown below is the Munsell color detection capacity diagram indicating the ratio of each voltage value to
the maximum voltage value when the maximum output voltage value of the color sensor is set as 100%.
The ratio of RGB data changes according to the Munsell color.
Another feature of color sensors is that the RGB ratio remains virtually unchanged as the sensing distance
changes.
The charts below show the receiver output of the color sensor and the receiver output ratio when the
sensing distance changes. Since the color sensor is a type of reflective optical sensors, the receiver RGB
output value changes with changes in sensing distance, but the receiver RGB output ratio remains almost
unchanged. This is because the sensor detects not only the light intensity reflected from the sensed object,
but also the RGB wavelength components contained in the reflected light. This makes it possible to stably
differentiate the color of sensed objects even when the sensing distance to the object changes due to
flapping or other factors.
0
0.1
0.2
0.3
0.4
0.5
R G B
Output voltage [V]
Receiver output value
0
0.1
0.2
0.3
0.4
0.5
R G B
Output voltage [V]
Receiver output value
0%
20%
40%
60%
80%
100%
R G B
Output voltage
ratio
Ratio
0%
20%
40%
60%
80%
100%
R G B
Output voltage
ratio
Ratio
← As sensing distance changes, receiver output
value also changes.
← Even if sensing distance changes, receiver RGB
output ratio does not change.
Color sensor
Munsell color
Conceptual Image of Measurement
Munsell color detection capacity