Method and apparatus for compensating lateral displacements and low speed variations in the measure of a longitudinal profile of a surface
US9267792B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2013 |
| Grant date | Feb 23, 2016 |
| Priority date | — |
| Expiry date | Dec 5, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/88
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Measuring a distance to a surface while compensating for variations in a transverse position and/or low speed displacement of the instrument. One method includes retrieving a predetermined transversal distance from a longitudinal feature at which to extract a relevant distance; retrieving a distance set; retrieving a position of the longitudinal feature relative to the distance set; extracting a range point at the predetermined transversal distance from the longitudinal feature; adding the extracted point to a longitudinal distance set. In another method, if two sensors are provided with an overlap in the transversal direction, extracting a range point at a predetermined transversal position; adding the extracted range point to a longitudinal distance set; retrieving a pitch angle of the instrument; calculating a local slope of the surface using an overlapping transversal point, the pitch angle and the separation length; calculating a height variation using the local slope and a longitudinal separation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.