Double symmetrical piston water depth measurement sensor and measurement method of underwater pressure

Abstract

The invention discloses a dissymmetric piston type water depth measuring sensor and a method for measuring underwater pressure. The sensor comprises a main cylinder, the interior of the main cylinderis divided by two separation plates into three cavities, namely, the first cylinder, the second cavity and the third cavity from top to bottom in sequence, and the first cavity and the third cavity are communicated through a connecting pipe. A main piston is arranged in the second cavity, the main piston divides the second cavity into an upper cavity and a lower cavity which are independent, and the upper cavity and the lower cavity are filled with a liquid medium. One side of the upper cavity is connected with a pressure-sensitive element, the upper cavity is communicated with the interior ofthe pressure-sensitive element, one side of the lower cavity is connected with a pressure balancing device, and pressure in the upper cavity and pressure in the lower cavity are balanced through thepressure balancing device. The dissymmetric piston type water depth measuring sensor can be used for measuring the water depth in a deep sea environment and measuring subtle water depth changes, is low in power consumption and can work underwater for a long time.

Description

technical field [0001] The invention relates to a sensor, in particular to a double symmetrical piston water depth measuring sensor and a method for measuring underwater pressure. Background technique [0002] The measurement of ocean depth is obtained by measuring the pressure at the depth. Pressure measurement is widely used in ocean exploration, such as depth positioning and measurement of underwater robots, adjustment of offshore oil platforms, prediction of submarine earthquakes, etc. Measuring ocean water depth and small fluctuations in water depth in the ocean, that is, the pressure that needs to measure small fluctuations in pressure in a large pressure environment. In order to achieve this goal, the conventional approach is to improve the measurement accuracy of the sensor on the basis of ensuring a large range, which is a contradiction in the design of conventional pressure sensors. Patent CN2203450Y uses a pipeline with a delay medium connected to one side of the...

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Problems solved by technology

Patent CN2203450Y uses a pipeline with a delay medium connected to one side of the differential pressure sensor to measure small pressure changes under high static pressure, but for occasions where external pressure changes slowly, small pressure fluctuations cannot be effectively measured, so Very suitable for the measurement of deep water depth and small fluctuations in water depth; the patent CN102519544B method increases with the increase of water depth, the axial force borne by the piston gradually increases, which further leads to the increase of the axial thrust of the transmission mechanism, which further leads to greater power consumption of the motor , which is not conducive to the long-term operation and maintenance of the sensor in the deep sea

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