FBG-based full-depth adaptive high-precision full-flow penetration spherical probe

Abstract

The invention relates to an FBG-based full-sea depth self-adaptive high-precision full-flow penetration spherical probe, comprising a probe rod and a spherical CPT probe, the probe rod and the spherical CPT probe are connected through a probe rod connector, and the spherical CPT probe is provided with There are pore pressure measurement holes and permeable stones, and the pore pressure measurement holes are connected with the pore pressure passage of the lower chamber of the excess pore pressure sensor; the probe rod connector is sequentially provided with n differential pressure sensors with increasing ranges step by step from bottom to top (n≥2), the adjacent differential pressure sensors are connected by an interlocking device to form a multi-stage sensor nesting structure. Higher-order differential pressure sensors can protect the range of the sensor and obtain the best accuracy in the case of effective measurement, realize the self-adjustment of the range and accuracy, and can accurately obtain the mechanical properties of deep seabed sediments in the whole sea. For deep sea science Research, resource and energy development engineering activities and marine security and national defense engineering are of great significance.

Description

technical field [0001] The invention relates to the field of testing the mechanical properties of seabed sediments, in particular to an FBG-based full-sea depth self-adaptive high-precision full-flow penetration spherical probe. Background technique [0002] Focusing on the research on in-situ measurement devices for the mechanical properties of seabed sediments, for sea areas shallower than 4000m, there are commercial products for the measurement of mechanical properties of sediments below 1-2m below the seabed surface. For example, Dutch Fugro and Vandenberg companies took the lead in developing marine The static penetration testing equipment has successfully served many marine projects at home and abroad. At present, the CPT with the largest working water depth is GOST developed by MARUM in 2010, and the maximum working water depth is 4000m. [0003] As an emerging sensing technology, the application of fiber optic sensors has unique advantages in the measurement of mech...

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Problems solved by technology

[0005] If you follow the traditional method of selecting a sensor with a suitable range, it is difficult to decide what kind of sensor to choose for detection. Some people propose to choose according to the range of tens of Kp. However, the current investigation and research on the deep sea environment are very lacking. There is not enough understanding of the distribution and variation of the strength of seabed sediments. Considering that if there are rocks on the seabed, the sensor may be scrapped directly. On the other hand, when the probe penetrates into the water, an overload pressure will be generated, and the overload pressure will also be It may lead to the explosion of the sensor range. At present, there is no device in the world that can realize the mechanical properties of deep seabed sediments in the whole sea.

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