Communications – electrical: acoustic wave systems and devices – Transponders
Patent
1981-12-24
1984-12-04
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Transponders
367 6, 367106, 367134, 405166, H04B 1100
Patent
active
044868618
ABSTRACT:
Acoustic transponders are attached to sections of a submarine cable for use in accurately locating the cable during deployment or retrieval. An acoustic signal at one frequency, transmitted from the surface or elsewhere, stimulates one of the transponders to generate a first reply signal at a different frequency. The acoustic reply signal generated by each transponder is used to determine the location of that transponder and thus the location of its associated section of the cable. In order to measure cable tension during deployment or retrieval, a strain gauge at each transponder senses the tension of the cable at the location of its associated transponder. After each transponder transmits its first reply signal, it transmits a second reply signal delayed from the first reply signal by a time interval which is controlled by the output of its associated strain gauge. Therefore, the time interval between successive reply signals from a given transponder is representative of cable tension at the location of that transponder.
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Underwater Acoustics Catalog, 10 pp., including cover sheet, no date.
ISA Journal, vol. 8, No. 10, Oct. 1961, by T. E. Pochapsky, pp. 34-37.
AT&T - Technologies, Inc.
Dosse W. G.
Farley Richard A.
McBurnett R. D.
Rosen S. I.
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