Method and apparatus for the nondestructive testing of vessels made of composite material wound on a metallic liner by means of holographic interferometry
US5448352A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1994 |
| Grant date | Sep 5, 1995 |
| Priority date | — |
| Expiry date | Dec 20, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF17C2260/042
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vessel made of composite material wound on a metallic liner is tested via holographic interferometry, in which the interference of two holographic images of a tested zone are taken under two different states of thermal cycling. The thermal cycling is homogeneously applied to the entire liner, via a heated fluid placed inside the vessel. The interferogram is made outside the vessel, where a second image is made after having raised the liner to a temperature different from the one duly measured when the first image is made. The second image shot is controlled by the detection, outside and near the vessel, of a variation of the outer infrared radiation emitted by the vessel, resulting from the liner temperature variation being equal to a predetermined threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.