Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1977-07-14
1979-09-18
Smith, Alfred E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250270, G01V 500
Patent
active
041684281
ABSTRACT:
A pulsed neutron generator in a well logging instrument is pulsed at a clock frequency of 20 KHz. Inelastic scatter gamma rays are detected during a first time interval coinciding with the neutron source being on and capture gamma rays are measured during a second interval subsequent to the end of each neutron burst. Only a single detected pulse, assuming detection occurs, is transmitted during each of the two detection intervals. Sync pulses are generated in the well logging instrument scaled down to a frequency of 200 Hz for transmission to the earth's surface. At the earth's surface, the scaled-down sync pulses are applied to a phase locked loop system for regenerating the sync pulses to the same frequency as that of the clock frequency used to pulse the neutron source and to open the detection gates in the borehole instrument. The regenerated sync pulses are used in the surface instrumentation to route the pulses occurring in the inelastic interval into one section of a multichannel analyzer memory and the pulses occurring in the capture interval into another section of the multichannel analyzer. The use of memory address decoders, subtractors and ratio circuits enables both a carbon/oxygen ratio and a silicon/calcium ratio to be struck substantially free of background radiation.
REFERENCES:
patent: 3739172 (1973-06-01), Culver
patent: 4013874 (1977-03-01), Culver
Dresser Industries Inc.
Howell Janice A.
Mayer Robert W.
Smith Alfred E.
LandOfFree
Sync transmission method and apparatus for high frequency pulsed does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sync transmission method and apparatus for high frequency pulsed, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sync transmission method and apparatus for high frequency pulsed will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-898966