Catwalk tubular measurement and method of use

A method comprising:

• positioning a carrier assembly between a catwalk deck and a V-door of a drilling rig, the carrier assembly including:
• a carrier, the carrier adapted to move a tubular member along the length of the carrier;
• a skate, the skate slideable along the carrier, the skate positioned to engage a lower end of the tubular member and move the tubular member along the carrier;
• a proximity sensor, the proximity sensor positioned on the carrier, the proximity sensor having a sensitive axis or plane positioned to intersect the tubular member when the tubular member is in alignment with the proximity sensor;
• a first skate position sensor, the first skate position sensor adapted to measure the position of the skate along the carrier;
• and
• a second skate position sensor;
• positioning the tubular member onto the carrier;
• moving the tubular member along the carrier with the skate;
• detecting the upper end of the tubular member with the proximity sensor when the upper end of the tubular member is in alignment with the sensitive axis or plane of the proximity sensor;
• measuring the position of the skate with the first skate position sensor;
• determining the length of the tubular member;
• measuring the position of the skate with the second skate position sensor;
• comparing the measurement of the first skate position sensor with the measurement of the second skate position sensor;
• and
• determining if slippage in a wire rope has occurred.