Seabed pore water multi-parameter in-situ observation probe rod and method based on fiber bragg grating

Abstract

The invention relates to a seabed pore water multi-parameter in-situ observation probe rod based on a fiber bragg grating. The probe rod comprises a probe rod body and a probe rod pressure-resistant bin, a sensor array, an underwater acoustic transducer and a watertight connector are installed on the top of the probe rod pressure-resistant bin, an optical fiber multi-parameter demodulator, a master control system and a lithium battery are installed in the probe rod pressure-resistant bin, the bottom of the probe rod pressure-resistant bin is connected with an auxiliary bin which is in threaded connection with a metal permeable stone, and the bottom of the auxiliary bin is hermetically connected with the probe rod body; the probe rod body comprises probe rod units which are hermetically connected through a connecting piece, an external seawater channel and pore fluid channels are formed in the connecting piece, each pore fluid channel is embedded into a pore fluid controller, the connecting piece is sleeved with the metal permeable stone, each pore fluid channel is in threaded connection with an optical fiber pore water sensor on the upper end face of the connecting piece, each pore fluid channel is in threaded connection with a sampling bottle on the lower end surface of the connecting piece. The probe rod provides real and reliable observation data for monitoring and early warning of submarine geological disasters and ocean engineering construction, and has important practical significance.

Description

technical field [0001] The invention relates to the technical field of seabed monitoring, in particular to a multi-parameter in-situ observation probe rod and method for seabed pore water based on optical fiber gratings. Background technique [0002] At present, the global economic growth is slowing down, resource depletion, ecological damage and demographic dividend disappearing are serious problems, and various countries are looking for new economic growth points. Compared with terrestrial resources, global marine resources have greater development space and the technical problems of marine resource development are being continuously resolved. The marine industry in the 21st century will bring important development opportunities to these coastal cities and countries. The first trial mining of natural gas hydrates in Haicheng, South China Sea was successful, the Hong Kong-Zhuhai-Macao Bridge was officially opened to traffic, the Sino-French ocean satellite was successfully...

AI Technical Summary

Problems solved by technology

However, this method disturbs the sample greatly, and the properties of pore water in the sediment inevitably change during this process, making the measurement results uninterpretable

In addition, there is a method of directly penetrating the pore water sampling probe on the seabed for sampling, but this method often has fewer samples and has the disadvantage of being unable to continuously observe

However, technical methods such as submarine CPTU testing and submarine pore pressure observation probes often use electrical sensors to sense the pore water pressure changes of seabed sediments, which have low measurement accuracy and single functions.

[0006] Therefore, on the basis of the current existing technology, it is impossible to accurately and simultaneously obtain multiple parameter change data of seabed sediment pore water. How to develop a high-precision, multi-parameter in-situ long-term observation probe and The method provides real and reliable observation data for submarine geological disaster monitoring and early warning and marine engineering construction, which has important practical significance

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