Method and device for contactless online measuring of the wall thickness of hot-rolled pipes
US6666094B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 2000 |
| Grant date | Dec 23, 2003 |
| Priority date | — |
| Expiry date | Mar 10, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B38/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method for contactless online measuring of the wall thickness of hot-rolled pipes in the hot state for determining undesirable inner wall structures, at least one measuring head, operating according to the laser ultrasound method, scans a segment of a wall of a pipe to be measured in a circumferential direction during or directly after a rolling process. The course of the wall of a cross-section of the pipe is then reconstructed with a computer. The measuring head is a compact laser ultrasound measuring head adjustable relative to the pipe dimension to be measured. It has an excitation laser and an illumination laser and optical elements for collecting a carrier light containing the ultrasound signal and reflected at a surface of the pipe. The excitation and illumination lasers and the optical elements are arranged in a common housing of the measuring head. A pivot device is provided to pivot the laser ultrasound measuring head across a segment of the pipe in the circumferential direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.