Devices and systems for measurement of position of drilling related equipment

摘要: A depth measurement system (100) for determining an absolute of a drill string uses position acquisition device (104) to determine length value joint or stand being added the string. The receives signal from target object associated with joint. processed can be optical signal, radio acoustic other suitable signal. Using techniques such as time lapse, Doppler effect phase shift, determines parameter distance based on received Thereafter, processor by summing each making up and correcting newly