Borehole sensor
US4021774A · kind A · utility
55Cited by
5References
112Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1976 |
| Grant date | May 3, 1977 |
| Priority date | — |
| Expiry date | Jun 23, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V11/002
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A borehole sensor is presented including a three axis gimbal device for determining (1) a vertical plane, using the force of gravity as a reference, (2) a horizontal plane, using the force of gravity as a reference, and (3) the north direction, using the earth's magnetic field as a reference. A motor drive system drives parts of the mechanism to desired positions about the three axes, and error transducers determine the deviation from desired positions about the axes and provide feedback to the motor drive system to eliminate the error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.