US 9,049,433 B1 · High-speed railroad inspection using coordinated 3D cameras

Abstract

To emulate the 3D visual acuity of an individual track-walker, matched pairs of cameras (which simulate our human eyes) are mounted on a moving vehicle above the tracks. The cameras are mounted both transversely and longitudinally, to create 3D images in two orthogonal orientations, which helps to eliminate visual voids. The location and orientation of each pair of cameras is determined by its specific task, in the present case: (i) to examine each left or right rail for anomalies (two pairs), and (ii) to examine every tie for damage (at least one pair). The camera pairs enable measurements such as defect depth and track width variations. The images are compressed in real time for local storage or high-speed transmission for remote display. The basic arrangement of cameras can be amplified or modified as necessary to circumstances.

Claims18

Dependent claims

A method of detecting worn and defective surfaces on objects needing optical inspection comprising the steps of:

moving an array of imaging devices relative to said objects over a pathway, at least one pair of said imaging devices positioned as a first and second imaging device and having an included angle about a reference center plane to generate corresponding uncorrected first and second images of said objects;
capturing a sequence of image data formed as said imaging devices move over said pathway;
forming a sequence of corrected 3D images from said uncorrected first and second images by performing an alignment of said first and second images mechanically and/or electronically;
for each said pair of imaging devices, comparing at least one of said first or said second corrected 3D images against a reference image to identify a defective or worn surface of said object needing inspection;
where said worn and defective surface is on a railroad track component including at least one of:
a rail, a rail edge, nuts, tie-plates, base-plates, pandrol clips, or ties.

3 more elements

Dependencies are inferred from the claim text.

High-speed railroad inspection using coordinated 3D cameras

Life of this patent

High-speed railroad inspection using coordinated 3D cameras

Life of this patent

Abstract

Claims18