B5WC Built- In Color Sensor User's Manual ( E612- E1- 01) 16
8 Frequently Asked Questions
Q: Can the sensor detect color differences of an object with a glossy surface?
A: If a surface of an object to be detected is glossy, some of the white LED light emitted from the sensor
will reflect off the surface and enter the photosensitive area. Since this light does not contain color
information of the object, it is difficult to accurately detect the color information of the object if it is
glossy. In reality, the degree to which color information on the object can be obtained will vary
depending on the degree of glossiness. You need to evaluate the detection capability in your actual
application and on the object to be detected.
Q: There is a description of how to detect colored translucent liquids, but can the sensor detect color
differences of translucent solids (e.g. colored translucent glass or plastic)?
A: If a surface of an object is glossy such as colored translucent glass or plastic with a glossy surface,
the sensor cannot accurately detect the color information of the object even if it directly irradiates light
as it is. As with liquids, it may be possible to detect color differences if a reflective plate is used to
sandwich the translucent object. The precautions in this case are the same as for liquids. For details,
refer to 5. Usage (Detection).
Q: How large must the object to be detected be?
A: Ideally, the size of the object to be detected should be larger than the area of the lens surface of the
sensor (26.4 x 8.4mm).
Q: How should we deal with ambient light?
A: Design the structure of the equipment so that ambient light does not enter the sensor. If the lens
surface of the sensor must be exposed to the outside of the equipment, install the sensor in a direction
that prevents ambient light from entering the equipment as much as possible, and fully evaluate the
effects of such exposure. For details, refer to 7 Installation Method.
Q: Can the sensor detect color differences even if the object is black or white?
A: Since white and black colors theoretically have the same RGB ratio, it is difficult to distinguish white
or black using RGB ratios. On the other hand, there is a difference in the absolute value of the receiver
output values between white and black, which can be used to discriminate them. When attempting to
discriminate black and white using this method, however, the receiver output of the sensor is affected
by factors other than color information, such as distance. Please evaluate the sensor with a thorough
understanding of its characteristics and make your own judgment as to whether or not white and black
can be distinguished.
Q: Can the RGB ratio information in the characteristics data on the datasheet be read from the sensor?
A: Only RGB output voltage values can be read from this sensor. You need to calculate the RGB ratio
based on the readout RGB output voltage values.
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