Patent ID: 7185715

Claim:
A system for controlling sensor motion while measuring a parameter of interest in a wellbore formed in an earthen formation, comprising: (a) a drilling tubular conveyed into the wellbore, said drilling tubular having at least one vibrational node; (b) a first sensor positioned along the drilling tubular at the at least one vibrational node, the first sensor measuring the parameter of interest; (c) a substantially non-rotating stabilizer disposed along said drilling tubular to form the at least one vibrational node, said substantially non-rotating stabilizer reducing motion of said first sensor below a predetermined level and comprising; (i) a housing attached to said drilling tubular; (ii) a sleeve substantially surrounding at least a portion of said housing; (iii) a bearing acting cooperatively with said sleeve and said housing for allowing relative motion between the sleeve and the housing; and (iv) a rib attached to said housing, said rib extending radially outward from the housing to reduce motion of said first sensor below the predetermined level, wherein the rib is an adjustable rib adapted to be controllaby extended to contact a wellbore wall; (d) a downhole controller; and (e) a second sensor for detecting motion of the drilling tubular proximate the first sensor, said controller controlling the adjustable rib to reduce motion detected by said second sensor below the predetermined level.