Seabed heat flow long-term observation probe based on underwater robot platform

Abstract

The invention discloses a seabed heat flow long-term observation probe based on an underwater robot platform. The seabed heat flow long-term observation probe comprises a support probe lever and a plurality of self-capacitance temperature measuring units. The self-capacitance temperature measuring units are helically distributed at equal distance and fixed on the support probe lever to form a distributed multipoint temperature measuring structure, and temperature fluctuation of sediments in different depths of the seabed is observed in the long term. Each self-capacitance temperature measuring unit comprises a housing, a battery, a temperature measuring circuit board, a sensor packaging probe and a temperature sensor, wherein the battery and the temperature measuring circuit board are mounted in the housing, the sensor packaging probe is fixed at one end of the housing, and the temperature sensor is mounted in the sensor packaging probe and electrically connected with the temperature measuring circuit board. The temperature sensors closely contact with the sediments in the seabed, the self-capacitance temperature measuring units helically distributed guarantee that each temperature sensor can contact undisturbed sediments, and fastness and accuracy in temperature measurement of the sediments are guaranteed to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of temperature detection, in particular to a submarine heat flow long-term observation probe based on an underwater robot platform. Background technique [0002] Submarine heat flow is an important part of terrestrial heat flow, and it is an important basic data for studying ocean geodynamics, evolution of sedimentary basins, evaluation of oil and gas hydrate resources, and hydrothermal circulation mechanism. The seafloor heat flow can be measured by seafloor boreholes or seafloor heat flow probes, and can also be calculated by using the bottom-like reflection (BSR) of reflection seismic sections. Although the heat flow value obtained by submarine drilling (ODP or DSDP deep-sea drilling, oil drilling, etc.) is less affected by the shallow surface and has high reliability, the distribution of stations is small and the cost is high, so its application is limited. BSR heat flow is affected by factors such as t...

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Problems solved by technology

However, the size and weight of the LTMS are relatively large. The length, width and height of the bracket and the data recording cabin are 1.20m×0.43m×0.51m, the underwater weight is 22kg, and the weight in the air is 39.6kg.

However, the carrying capacity of ROV is usually limited, which makes it difficult for ROVs with weaker carrying capacity to carry out other equipment's subsea operations when deploying and recovering LTMS.

Therefore, its operation cost is relatively high, and the comprehensive operation efficiency is relatively low.

At the same time, like the sensor probe of PLHF, multiple temperature sensors are sealed in a metal tube filled with heat transfer oil. The diameter of the metal tube is greater than 13mm. Due to the isolation effect of the oil and the tube wall, the response of the temperature sensor to the temperature change of the surrounding deposits is lagging , some high-frequency and small-amplitude temperature change signals are filtered out, resulting in a decrease in the sensitivity of the temperature sensor

However, reducing the diameter of the metal tube will lead to a decrease in its strength, and it is easy to bend during insertion

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