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Gain stabiliser in radioactive well logging tool - with light emitting diode supplying reference pulses to photomultiplier tube to compensate gain-variations
Gain stabiliser in radioactive well logging tool - with light emitting diode supplying reference pulses to photomultiplier tube to compensate gain-variations
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机译:放射性测井仪中的增益稳定器-发光二极管向光电倍增管提供参考脉冲以补偿增益变化
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摘要
Radioactive well-logging appts. includes a neutron source and a scintillation detector responsive to gamma radiation. A photomultiplier tube forms voltage pulses from light flashes produced by the detector. A gain stabilising arrangement includes a light emitting diode mounted between the scintillation and the photomultiplier. An oscillator drives the diode to emit light pulses which are coupled through a transparent mounting disc to the photomultiplier. The device is mounted in a sonde which is lowered down a borehole into an earth formation to be scanned. The diode produces reference pulses for use in compensating gain variations in the system. The gain stabilising appts. can be easily removed and replaced in the sonde.
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