Patent ID: 7609439
Filing Date: 2009-10-27
Classification: G01C

Abstract:
1. An improvement to an infrared target assembly used in industrial surveying, the assembly including a body having an axial centerline with a detector beneath a lens within said body, said improvement comprising: an overlay opaque to visible light and infrared radiation, having a central round hole, and centerline, for admitting infrared radiation and a precise location upon the lens and within the assembly thus locating the centerline of the overlay within a tolerance of 0.0005 inches or less of the centerline of the body, said overlay and said target assembly operating at approximately room temperature; and a reflective ring, having a central round hole of greater diameter than the central hole of said overlay and for admitting laser radiation, said ring located upon said overlay and abutting said assembly, and said reflective ring reflecting radiation outward from said assembly.