Sensing Ranges In Diffuse Sensing

October 25, 2011
By Anonymous

Sensing Ranges

Why do Sensing Ranges vary depending on their make-up when using Diffusing Sensing? A diffuse/reflective sensor shines its light onto a sensing object and detects the object by how strong the light (intensity) is reflected back.


                                                                                              Figure 1

The intensity of the reflected light varies depending on the material, color, and surface condition (evenness, gloss) of the sensing object. In other words, detection depends on the object itself.                                                                                                                                                            Correlation between sensing object size and sensing range - CX-424

                                    Figure 2: Correlation Between Sensing Object And Sensing Range

Sensing Object Size                               

The bigger the sensing object, the bigger the reflection becomes. However, if the sensing object is exceeding the spread of light and the broad of light receiving field, the sensing range does not get longer.


                                                                                                Figure 3

Figure 3 shows relative sensing range for different sensing objects have been given taking the sensing range for white non-glossy paper as 100. The values are given for reference. “Black is 40% of white, aluminum is 3.5 times white, mirror is 8.5 times white.” This bit of information is beneficial to interpretation of the information.

Below are various other materials with relative reflectivity and excess gain:


                                                                                           Figure 4

The sensing range noted in the catalog is the value specified for a standard sensing object (mainly white non-glossy paper of standard size).

Note: It is necessary to confirm detection with the actual sensing object.

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