Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent
1993-10-05
1994-11-08
Bui, Thuy M.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
175 61, E21B 4700
Patent
active
053618548
ABSTRACT:
A laser positioning and measuring system for an earth boring apparatus is disclosed which includes a unique measuring unit comprising a pair of lasers mounted in a back-to-back relation with targets at their free ends. The targets include a beam passage through which laser beams from the measuring units are emitted. The emitted laser beams strike a target on an adjacent measuring unit. The area of which the laser beam impinges upon the adjacent targets generates a signal to indicate the displacement of the laser beams with respect to the adjacent targets to provide a coordinate and angle signals. The signals are processed in the computer to indicate deviations between the measuring units. The measuring units are spaced along the bore, for example, by attachment near the joints of the individual pipe casings which are pushed through the bore by the earth boring apparatus. The deflection of the casings from the desired bore direction is measured by the measuring units as disposed at the joints of the casing and processed to indicate a deviation in the distance of the leading pipe casing from the point of origin. Each target comprises a photo array of light sensing elements which detects the impingement area of the beam coming from the adjacent measuring unit.
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Berry Frederick
Tull Herbert
Bui Thuy M.
Flint Cort
Lag Steering Systems
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