Recorders – Combined with external recorder operating means – Well logging
Patent
1979-05-29
1980-09-23
Miller, Jr., George H.
Recorders
Combined with external recorder operating means
Well logging
364483, G01D 900, G01D 410
Patent
active
042246725
ABSTRACT:
The invention relates to a perturbation signal recorder. An input circuit receives a series of signals to be monitored and samples them in order to supply in respect of each sample a digital word to a pre-memory circuit which preserves the n most recent digital words. In the presence of a perturbation, a central unit excites a main memory circuit in order that it records the n most recent digital words at the time of the perturbation, as well as the following digital words during and after the perturbation. The contents of the main memory are thus transferred at a slow rate to an output circuit, which re-transforms the signals to an analogue form and applies them to a graphic recorder.
REFERENCES:
patent: 3363226 (1968-01-01), Murphree
patent: 3566392 (1971-02-01), Jones et al.
patent: 3676649 (1972-07-01), Burk
patent: 3825935 (1974-07-01), Kortman
patent: 3936740 (1976-02-01), Hogg et al.
patent: 4050057 (1977-09-01), Backman Jr. et al.
patent: 4062020 (1977-12-01), Berglund
Cormault Pierre J. B.
Leleu Rene O.
Chiarelli Etudes et Realisations Mecaniques et Electroniques
Electricite de France
Miller Jr. George H.
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