High-precision and high-efficiency calibration device and method for seawater carbon dioxide sensor

Abstract

The invention discloses a high-precision and high-efficiency calibration device and method for a seawater carbon dioxide sensor. The calibration device comprises a gas supply device, a calibrator, a water storage device, a control box and a table type carbon dioxide gas analyzer. By adopting the design of the water storage device, a spray header and the like, the water-gas mixing efficiency is high, and the overall efficiency of the calibration test can be ensured. Bin opening is not needed in the whole testing process of the device, all operations such as water discharging, water feeding, airblowing, circulating and detecting can be achieved through switching of valves such as an air control three-way valve, a water control three-way valve and a water control valve, and interference of an external environment can be reduced to the maximum extent. The reference value of the calibration test is the measured value of the concentration of carbon dioxide in air in the calibrator after water-gas mixing balance, the measurement principle of the reference value is consistent with that of an internationally recognized underway carbon dioxide continuous observation system, and the accuracyof the reference value can be ensured.

Description

technical field [0001] The invention belongs to the field of sensor calibration, and in particular relates to a high-precision and high-efficiency calibration device and method for a seawater carbon dioxide sensor. Background technique [0002] Accurately measuring the partial pressure of carbon dioxide in seawater is key to uncovering the ocean's role in global climate change. In general, there are two ways to obtain the partial pressure of carbon dioxide in seawater: continuous observation of carbon dioxide during navigation and long-term observation with fixed-point in-situ carbon dioxide sensors. Seawater carbon dioxide sensors based on permeable membrane technology can obtain a large amount of in-situ data, and are widely used in the research of global climate change in coastal areas, oceans, polar regions, and ocean acidification in sensitive areas such as coral reefs. During the long-term use of the carbon dioxide sensor in the field, due to the influence of biologic...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing seawater carbon dioxide sensor calibration device, which are bulky and inefficient, and to provide an efficient and high-precision seawater carbon dioxide sensor calibration through the improvement of the mixing efficiency of water body carbon dioxide and the measurement of the reference value. device

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