Abstract:
One aspect of the invention provides a sensor including: one or more fiber optic emitters and one or more fiber optic receivers lying in the same plane and spaced from, but proximate to the one or more fiber optic emitters. Another aspect of the invention provides a sensor including: one or more fiber optic emitters and one or more fiber optic receivers spaced from, but proximate to the one or more fiber optic emitters. Each of the one or more fiber optic receivers have an end that lies outside of a light beam emitted by the one or more fiber optic emitters.