| 主权项 |
1. An optical element for use in a camera system for the inspection of wellbore passageways, the element comprising an optical layer having opposing first and second solid end faces, and the optical layer comprising:
a first substantially clear optical portion arranged to transmit light into a camera, said first optical portion having opposing front and rear faces; and a second substantially clear optical portion arranged to transmit light emitted from a light source, said second optical portion located adjacent said first optical portion and said second optical portion having opposing front and rear faces, the front faces of the first and second optical portions being co-planar and forming said first end face of the optical layer, and the rear faces of the first and second optical portions being co-planar and forming said second end face of the optical layer, wherein at least a portion of a surface of said second optical portion is in direct contact with at least a portion of a surface of said first optical portion, and barrier means between said first and second optical portions comprises an interface formed by said contact, the barrier means being arranged to prevent light being transmitted from said second optical portion into said first optical portion. |
