Patent ID: 7384008

Claim:
An irrigation system, comprising: a plurality of pipe spans joined together to form an elongated pipeline; each of said pipe spans supported upon an associated drive unit to propel said water pipeline over the area to be irrigated; each of said drive units including a drive unit motor; a flexible joint between adjacent pipe spans including first and second joint members secured to adjacent pipe spans, respectively; said first and second joint members being pivotally secured together about horizontal and vertical axes; and a laser alignment system associated with said first and second joint members which senses alignment information of the adjacent pipe spans to control the operation of the drive motor on the associated drive unit to maintain the adjacent pipe spans in proper alignment; said laser alignment system including a laser light source mounted on said first joint member and a light sensor array mounted on said second joint member; said laser light source creating a single point light source which is directed towards said light sensor array; said laser alignment system also including a line generator positioned between said laser light source and said light sensor array which is in the path of the single point light source and which creates a vertically disposed laser line which is sensed by said light sensor array whereby the alignment of the laser light source relative to the light sensor array may be measured to control the activation and deactivation of the associated drive motor to maintain the pipeline in alignment.