US Patent 11753881 Tubular detection system for a fingerboard

A system comprising a rig, a fingerboard, a first sensor, and a second sensor, with the first sensor positioned on an opposite side of the entrance from the second sensor, where the first sensor and the second sensor are used to detect when a tubular enters or exits the fingerboard and to detect a parameter of the tubular, such as diameter of the tubular, speed of the tubular, and an angle of entry of the tubular. A method comprising sensing, via first and second sensors, when a tubular is entering a fingerboard through an entrance of the fingerboard, restricting movement of a top drive at an elevated position until the first and second sensors sense the tubular entering the fingerboard, and enabling movement of the top drive when the first and second sensors sense the tubular entering the fingerboard.