发明名称 Direct velocity seismic sensing
摘要 A disclosed direct velocity seismic sensor includes a housing, a proof mass suspended in the housing by a resilient component, and a motion dampener that damps oscillation of the proof mass to a degree that displacement of the proof mass relative to the housing is substantially linearly proportional to a rate of change of seismic displacements of the housing over a frequency range of interest. A described method for constructing a seismic sensor includes using a calculated resonant frequency to determine a damping factor that causes the displacement of the proof mass to be substantially proportional to the rate of change of seismic displacement of the housing. One illustrative disclosed system includes an optical velocity sensor and a detector where a light beam produced by the velocity sensor and a reference beam interfere at the detector, and the detector produces a signal indicative of a velocity experienced by the velocity sensor.
申请公布号 US8990022(B2) 申请公布日期 2015.03.24
申请号 US201314135897 申请日期 2013.12.20
申请人 PGS Geophysical AS 发明人 Fernihough Robert A. P.
分类号 G01V1/00;G01P13/00;G01V1/18;G01V1/38 主分类号 G01V1/00
代理机构 代理人
主权项 1. A marine geophysical survey method that comprises: deploying one or more cables or streamers in a marine environment, each cable or streamer having frequency- or wavelength-multiplexed optical geophones positioned at spaced intervals; collecting velocity measurements from the optical geophones, wherein the collecting includes: optically measuring in each geophone a displacement of a resiliently-coupled proof mass relative to a sensor housing, the proof mass being sufficiently damped to make the displacement proportional to a velocity of the housing over a frequency range of interest; and imaging a survey region based at least in part on the velocity measurements.
地址 Oslo NO