Radiant energy – Radiant energy generation and sources – With radiation modifying member
Patent
1979-06-29
1981-04-28
Dixon, Harold A.
Radiant energy
Radiant energy generation and sources
With radiation modifying member
250355, 250499, 250501, G21G 402, G01J 142
Patent
active
042648238
ABSTRACT:
A pulsed neutron well logging system using a sealed off neutron generator tube is provided with a programmable digital neutron output control system. The control system monitors the target beam current and compares a function of this current with a preprogrammed control function to develop a control signal for the neutron generator. The control signal is used in a series regulator to control the average replenisher current of the neutron generator tube. The programmable digital control system of the invention also provides digital control signals as a function of time to provide ion source voltages. This arrangement may be utilized to control neutron pulses durations and repetition rates or to produce other modulated wave forms for intensity modulating the output of the neutron generator as a function of time.
REFERENCES:
patent: 3176136 (1965-03-01), Hopkinson
patent: 3657539 (1972-04-01), Pierson
patent: 3949232 (1976-04-01), Langford et al.
patent: 4092545 (1978-05-01), Langford et al.
Bridges James R.
Peelman Harold E.
Sloughter William J.
Beard William J.
Dixon Harold A.
Halliburton Services
Tregoning John H.
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