Method and apparatus for stabilizing signals in radioactive well logging tools
A method and apparatus are presented for stabilizing signals in radioactive well logging tools. In the tool a main scintillating crystal and photomultiplier tube for detecting radiation induced in the borehole by a source of radiation are provided and a reference crystal, including a source of mono-energetic radiation, for producing continuous reference signals of a predetermined energy level. The signals are monitored and the spectrum is stabilized to correct for drift of the data signals introduced by the photomultiplier tube and the data transmission system. The preferred mono-energetic reference signals are selected to appear in the energy spectrum at a level which minimizes error. An electronic circuit at the surface provides a correction signal for adjusting the gain of a data signal amplifier responsive to changes in the reference signal, thereby correcting for drift in the data signal.
- Assignee:
- Halliburton Co.
- Patent Number(s):
- US 4053767
- OSTI ID:
- 6512367
- Country of Publication:
- United States
- Language:
- English
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03 NATURAL GAS
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440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
AMPLIFIERS
BOREHOLES
CAVITIES
DESIGN
ELECTROMAGNETIC RADIATION
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
GAMMA RADIATION
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
NATURAL GAS DEPOSITS
NEUTRON LOGGING
NEUTRON SOURCES
NEUTRON-GAMMA LOGGING
PARTICLE SOURCES
PETROLEUM DEPOSITS
PHOTOMULTIPLIERS
PHOTOTUBES
PROBES
RADIATION DETECTORS
RADIATION SOURCES
RADIATIONS
RADIOACTIVITY LOGGING
RESOURCES
SCINTILLATION COUNTERS
SIGNALS
STABILITY
WELL LOGGING