Optics module for borehole stress measuring instrument
US3992095A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1975 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Jun 9, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/902
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An optics module for use in a holographic borehole instrument which is operable to determine the stress in the wall of a borehole by recording successively on the same holographic recording medium two holograms of a selected surface region of the wall and, in the interval between the two recordings, drilling a stress relief hole in the wall in stress relieving relation to the selected surface region to produce on the recording medium a double exposure hologram containing holographic information representing the stress. The optics module embodies a frame which adjustably mounts the optical elements of the holographic system of the instrument in a manner which facilitates initial alignment of the system and preserves the alignment during instrument operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.