Patent ID: 10151561

Abstract:
A cant indication apparatus includes a spirit level having a first and second surface, said spirit level containing a first fluid, said first fluid having at least one of a first light transmittance and absorbance, and a second fluid forming a bubble in said first fluid, said second fluid having at least one of a second light transmittance and absorbance, said bubble position indicating orientation. The apparatus further includes a light receiving optical fiber having a light receiving end and a spirit level connection end, said optical fiber spirit level connection end connected to said first surface of said spirit level whereupon said spirit level bubble is nearest said spirit level connection end of said light receiving optical fiber when said spirit level is in an uncanted orientation. The apparatus further includes a light transmitting and cant indicating optical fiber having a spirit level connection end and an orientation indication end, said optical fiber spirit level connection end connected to said second surface so as to be in substantial optical alignment with said optical fiber spirit level connection of said light receiving optical fiber, said orientation end illumination indicating at least one of a canted orientation and an uncanted orientation.