Problem:
1. It’s difficult to mount a back light behind the target because the machine is spinning.
2. The Glass container can focus the light causing unstable detection.
3. Reflected Light off the product can cause unstable detection.

Solution:
1. Using wavelength conversation
sheet its possible to mount behind the target without running electrical cables.
2. The meniscus of the water appears more clearly.
3. The ambient light reflected of the target is cut from the image.

This is the image obtained from the camera when a white workpiece is placed on top of the wavelength conversion sheet and the white sheet. [Light from the white sheet and the workpiece is reflected white and
the light conversion sheet reflects orange]

This is the image obtained when a blue light is shone onto the parts. [Light from the white workpiece and the white sheet are reflected blue. The wavelength conversion sheet converts the blue light to an orange/red colour and reflects this colour]

This is the image obtained when a [blue cut filter] is added onto the front of the lens, this cuts out the reflected light in the blue range, and only allows the light from the wavelength conversion sheet to enter the lens. In this way, an image similar to that of a silhouetted image is captured whilst cutting out any reflected light from the workpiece.