Rotation sensor for borehole telemetry
US4013945A · kind A · utility
45Cited by
5References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 12, 1975 |
| Grant date | Mar 22, 1977 |
| Priority date | — |
| Expiry date | May 12, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotation sensor and output signal processing apparatus is presented. The rotation sensor is a ring core flux gate magnetometer whose output varies as a function of the earth's magnetic field. The phase angle of the second harmonic of the magnetometer output is sensed to provide an indication of the state of rotation of the magnetometer. When a state of no rotation is sensed, actuating signals are delivered to a control system to sense borehole parameters and telemeter the parameters to the top of the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.