Apparatus for use in investigating earth formations

Details Apparatus for use in investigating earth formations Apparatus for use in investigating earth formations

1975-02-18

1977-04-26

Birmiel, H.A.

Communications: electrical

Selective

Interrogation response

340 18R, 181102, G01V 140

Patent

active

040204529

ABSTRACT:
In accordance with an illustrative embodiment of the present invention, there is shown a substantially rigid member having interruptions in the longitudinal continuity of the member to provide tortuous paths for the passage of acoustic energy along the member. A plurality of masses are periodically spaced along the interior of the member and are each mechanically integral with opposite sides of the member at locations chosen to enable the member and masses to cooperate as a mechanical filter. By so doing, the structure made of the member and masses will have good acoustic delay and attenuation characteristics as well as good mechanical characteristics.

REFERENCES:
patent: 2757358 (1956-07-01), Ely
patent: 3190388 (1965-06-01), Moser et al.
patent: 3191141 (1965-06-01), Schuster et al.
patent: 3191142 (1965-06-01), Lebourg
patent: 3213415 (1965-10-01), Moser et al.
patent: 3271733 (1966-09-01), Cubberly, Jr.
patent: 3493921 (1970-02-01), Johns

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