METHODS OF MECHANICAL NOISE IMPACT SUPPRESSION DURING STREAMER TOWING PROCESS USING FIBER BRAGG GRATINGS

Subject of Research. The paper deals with the problem of seismic streamers towing process during marine geological exploration. Classification of the mechanical noise effects during towing process is presented. A brief overview of the main technical solutions is performed for suppression of each impact type. Method. A method is proposed for calculating the parameters of elastic sections for suppression of noise effects, which takes into account towed body tension level. We show the possibility and prospects of applying for this purpose a fiber-optic strain measurement system based on Bragg gratings inscribed in the G.657.A1 standard SMF-28 telecommunication optical fiber with a sampling rate of 5 kHz as part of a fiber-optic seismic streamer design. Main Results. Experimental data on the prototype research are given. With the relative elongation of the uniform-strength bar in the range up to 1030 μm/m, an average sensitivity of 0.68 pm (μm/m) is achieved, and the spread of values is ±1 pm. It is shown that the work of fiber Bragg gratings is practically non-inertial itself. The response time and dynamic range of the sensor amplitude is largely determined by the properties of metal bars and tool set where optical fibers are fixed. Practical Relevance. Application of the method provides opportunities for the solid construction of the towed body. The possibilities for calculation of the elastic section parameters to the specific conditions of marine geological exploration and continuous state monitoring of the towed body are presented. The method makes it possible to control the quality of the recorded seismic data and partially compensate the undesirable effects during signal processing. Proposed measures will increase significantly the accuracy and reliability of the obtained geological data.

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