Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1982-02-22
1986-12-09
Cangialosi, Salvatore
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
34087013, 34087014, 370100, 370 4, G01V 122, H04J 300
Patent
active
046284931
ABSTRACT:
A seismic array containing a large number of seismic sensors, which may be optical hydrophones, has successive sections, each of which contains a subarray of sensor channels, interconnected by a fiber optic signal transmission line via telemetry modules. Synchronizing signals for initiating successive scans of the sensors in the array and timing the multiplexing of the channels are transmitted along the signal transmission line from the tail end of the line through telemetry modules to the head end. Equipment for receiving, demultiplexing and processing the seismic data is provided at the head end. The array may be towed as a seismic streamer and the head end equipment located topside on the towing vessel. The telemetry modules provide hybrid optical/electrical operation such that array sections including the optical hydrophones and fiber optic links are coupled to each other exclusively by electrical connectors. Submultiplexing of each subarray of sensors (hydrophones) is carried out by the telemetry module under control of scan synchronizing and timing signals so as to avoid the need for anti-aliasing filters and sample and hold circuits associated with the hydrophones in the array, while improving the signal to noise ratio of the seismic data signals derived from the array, in spite of shot or photon noise and also minimizing timing skew errors.
REFERENCES:
patent: 3851302 (1974-11-01), Schmitt
patent: 3911226 (1975-10-01), Angelle et al.
patent: 3990036 (1976-11-01), Savit
patent: 3996553 (1976-12-01), Siems et al.
patent: 4005273 (1977-01-01), Siems
patent: 4023140 (1977-05-01), Siems et al.
patent: 4072923 (1978-02-01), Siems et al.
patent: 4089584 (1978-05-01), Polczynski
patent: 4092629 (1978-05-01), Siems et al.
patent: 4107518 (1978-08-01), McMahon
patent: 4117448 (1978-09-01), Siems
patent: 4218767 (1980-08-01), Joosten et al.
patent: 4234968 (1980-11-01), Singh
patent: 4301522 (1981-11-01), Guyot et al.
patent: 4408307 (1983-10-01), Harris
Hamming "Digital Filters" Prentice-Hall Inc. (1977), available at Library of Congress.
McMahon, "Efficiency Limitations Imposed by Thermodynamics on Optical Coupling in Fiber-Optic Data Links" J. of Optical Society of America, vol. 65, No. 12, Dec. (1975), pp. 1479-1482.
Nelson et al., "Passive Multiplexing System for Fiber-Optic Sensors" Applied Optics, vol. 19, No. 17, Sep. (1980), pp. 2917-2920.
Berg David M.
Hannon Robert J.
Nelson David E.
Cangialosi Salvatore
Hydroacoustics Inc.
Lobo Ian J.
Lukacher M.
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