Rigid Sensor Holder for Marine Seismic Streamer Noise Suppression
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Solution Overview
Problem
In marine seismic surveying, particle motion sensors in seismic streamers face noise interference due to improper orientation and contact with stress members, leading to decreased sensitivity to seismic signals.
Innovation Solution
The use of elongated strength members with rigid sensor holders, comprising pairs of support plates and central receptacles, to securely mount particle motion sensor assemblies, preventing transverse and axial motions and thus reducing noise from vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particle motion sensor assemblies are laced to a wire loom with slack, then the wire loom can be securely mounted at spacer positions, but the sensor assemblies experience improper orientation and contact with stress members resulting in vibration noise and decreased sensitivity
Solution Approach 1:
A rigid support structure with support plates and central receptacles is introduced as an intermediary between the wire loom and the particle motion sensor assembly. This rigid intermediary prevents the sensor from contacting the wire loom and stress members directly, thereby eliminating vibration noise transmission while maintaining secure mounting.
Solution Approach 2:
The mounting system is segmented into distinct functional components: support plates that attach to the wire loom, central receptacles that hold the sensor, and rigid structural elements that maintain spacing. This segmentation allows each component to perform its specific function - the support plates provide secure attachment while the rigid structure prevents noise transmission.
2Strength
If sensor assemblies are pressed against the streamer's outer jacket or stress members, then structural support is provided, but vibration noise is transferred to the sensors and sensitivity to seismic signals decreases
Solution Approach 1:
The rigid support structure acts as an intermediary that provides structural support through the support plates attached to the wire loom, while the sensor remains isolated in the central receptacle. This intermediary structure transfers the load-bearing function away from direct sensor contact, providing strength without noise transfer.
Solution Approach 2:
The sensor assembly is extracted from direct contact with the wire loom and stress members, and placed into the central receptacle of the rigid support structure. This extraction removes the sensor from the noise-generating environment while maintaining the structural integrity of the overall assembly.
3Ease of manufacture
If the wire loom is secured firmly only at spacer positions, then constructional and operational requirements are met, but the orientation and location of sensor assemblies change due to handling and movement
Solution Approach 1:
The rigid support structure with pre-formed support plates and central receptacles is prepared in advance during manufacturing. This preliminary action establishes precise sensor locations and orientations before the streamer assembly process, ensuring that sensors maintain their correct positioning even when the wire loom is handled and moved during subsequent assembly steps.
Solution Approach 2:
The mounting system is divided into modular segments - the rigid support structure with integrated support plates and receptacles can be prepared as discrete units with precise sensor positioning, then attached to the wire loom at spacer positions. This segmentation allows precise sensor placement to be maintained independently of the wire loom's handling and movement.
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A seismic streamer includes at least one elongated strength member (40). The seismic streamer further includes a substantially rigid sensor holder (50) coupled to the strength member and fixed in position relative to the strength member. The streamer includes at least one particle motion sensor (3) coupled to the sensor holder and fixed in position relative to the sensor holder.