Patent ID: 7558155
Filing Date: 2009-07-07
Classification: G01D,G01V

Abstract:
1. A seismic sensing system comprising: at least one array connection module; a plurality of array cables extending from the array connection module, each array cable including a series of array cable modules and a multi-fiber lead cable, each array cable module including one or more series of seismic sensor stations connected by multi-fiber lead cables, each station housing a plurality of optical sensors sharing a common wavelength, the common wavelength being different for each station in a same series, all stations within the same array cable module sharing a common sensor fiber; for each array cable module, a module connection node to couple a different one or more fibers of the lead cable to a sensor fiber used to interrogate a series of corresponding seismic sensor stations; instrumentation coupled to the series of sensor stations and configured to interrogate sensors housed in each station using time division multiplexing (TDM) and to interrogate sensors housed in different sensor stations in each series using wavelength division multiplexing (WDM); and wherein the instrumentation includes means for spreading the different wavelengths out in time.