Patent ID: 7109513

Claim:
An optical fluid level sensing system usable to determine a level of a liquid in a fluid container, the optical fluid level sensing system comprising: a low sensor target extending in a fluid reservoir to a low position, the low sensor target having a low incident surface, a low reflecting surface and at least one non-critical surface and a high sensor target extending in the fluid reservoir to a high position, the high sensor target having a high incident surface, a high reflecting surface and at least one non-critical surface; and at least one wicking means, wherein the at least one wicking means is located on at least one of the at least one non-critical surface of the low sensor target or the at least one non-critical surface of the high sensor target, and the at least one wicking means extends from an apex of the low sensor target to an apex of the high sensor target; and wherein light is projected through at least one of the low sensor target to the low incident surface and the high sensor target to the high incident surface, and the light is reflected from at least one of the low sensor target and the high sensor target when the level of the fluid is below the at least one of the low sensor target and the high sensor target.