Dynamic fiber optic sensor signal processing scheme
AssigneePGS Americas, Inc.
InventorSteven J. Maas
Life of this patent
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Abstract
The claimed invention is an apparatus, method and system for optimizing bandwidth utilization of demodulators in a system for seismic signal processing, wherein the apparatus comprises demodulators having bandwidths, wherein one demodulator's bandwidth is greater than another demodulator's bandwidth. The apparatus further comprises an optical switch coupled to a fringe rate detector, wherein optical fibers bear seismic signals having fringe rates detected by the fringe rate detector. The optical signals are switched among the demodulators in dependence upon the fringe rates. Further, the claimed invention is an apparatus, method and system for active gain ranging of demodulated signal outputs.
Claims41
An apparatus for optimizing bandwidth utilization of demodulators in a system for seismic signal processing, the apparatus comprising:
- a first demodulator comprising a first bandwidth and first optical demodulator inputs;
- a second demodulator comprising second optical demodulator inputs and a second bandwidth, wherein the second bandwidth is greater than the first bandwidth;
- an optical switch comprising:
- optical inputs coupled to optical fibers,
- optical outputs coupled to the first optical demodulator inputs and the second optical demodulator inputs, and
- a switch control input electronically coupled to a fringe rate detector output;
- and
- the fringe rate detector having a fringe rate detector input coupled to the optical fibers from seismic telemetry and a fringe rate detector output coupled to the switch control input;
- wherein the optical fibers bear optical signals having fringe rates;
- whereby the optical signals are switched among the demodulators in dependence upon the fringe rates.
A method of processing seismic signals, the method comprising:
- routing optical signals to a first demodulator;
- sensing fringe rates of the optical signals;
- detecting fringe rates exceeding a threshold fringe rate of the first demodulator;
- rerouting optical signals having fringe rates exceeding the threshold fringe rate of the first demodulator to a second demodulator;
- detecting fringe rates falling below the threshold fringe rate of the first demodulator;
- and
- rerouting optical signals having fringe rates falling below the threshold fringe rate of the first demodulator from the second demodulator back to the first demodulator.
A system of processing seismic signals, the system comprising:
- means for routing optical signals to a first demodulator;
- means for sensing fringe rates of the optical signals;
- means for detecting fringe rates exceeding a threshold fringe rate of the first demodulator;
- means for rerouting optical signals having fringe rates exceeding the threshold fringe rate of the first demodulator to a second demodulator;
- means for detecting fringe rates falling below the threshold fringe rate of the first demodulator;
- and
- means for rerouting optical signals having fringe rates falling below the threshold fringe rate of the first demodulator from the second demodulator back to the first demodulator.
Dependencies are inferred from the claim text.