FBG-based full-sea-depth self-adaptive high-precision pressure conduction type static sounding conical probe

Abstract

The invention relates to an FBG-based full-sea-depth self-adaptive high-precision pressure conduction type static sounding conical probe, which comprises a probe rod and a CPT conical tip, the probe rod and the CPT conical tip are connected through a probe rod connector, and a buffer rubber pad and a permeable stone are also arranged between the CPT conical tip and the probe rod connector; n differential pressure sensors (n is greater than or equal to 2) with gradually increased measuring ranges are sequentially arranged in the probe rod connector from bottom to top, the adjacent differentialpressure sensors are connected through an interlocking device to form a multi-stage sensor nested structure, and when the full measuring range of the low-measuring-range sensor is reached, the low-measuring-range sensor is locked through the interlocking device. Measurement is carried out through a next-stage higher-order differential pressure sensor, the measuring range of the sensor can be protected, the optimal precision can be obtained under the condition of effective measurement, self-adjustment of the measuring range and the precision is achieved, and the mechanical property of the full-sea-depth seabed sediment can be accurately obtained. The FBG-based full-sea-depth self-adaptive high-precision pressure conduction type static sounding conical probe is of great significance to deepsea scientific research, resource and energy development engineering activities and marine safety national defense engineering.

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 pressure conduction static penetrating cone 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 measure...

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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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