Pulsed neutron logging system for inelastic scattering gamma rays with gain compensation
US3939343A · kind A · utility
4Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1974 |
| Grant date | Feb 17, 1976 |
| Priority date | — |
| Expiry date | Mar 4, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An illustrative embodiment of the invention includes methods for linearizing the gain of borehole gamma ray energy measurement apparatus. A known energy peak (or peaks) which is prominent in the gamma ray energy spectra of borehole measurements is monitored and any drift in its apparent location in the energy spectrum is used to generate an error voltage. The error voltage is applied in an inverse feedback manner to control the gain of system amplifiers to cancel the drift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.