Optical dissolved oxygen sensor in-situ self-calibration device and method

Abstract

The invention belongs to the technical field of dissolved oxygen sensors calibration and discloses an optical dissolved oxygen sensor in-situ self-calibration device which comprises a calibration gasgenerator and a calibration device underwater part; the calibration gas generator comprises a saturated air bottle, a high-purity nitrogen bottle, a quality flow controller and a water removal device;the calibration device underwater part comprises a calibration test box, a dissolved oxygen sensor to be calibrated in the calibration test box and a temperature, humidity and air pressure sensor; and the calibration test box is provided with a water inlet, a water outlet and a gas inlet. By adopting the optical dissolved oxygen sensor in-situ self-calibration device and method, by using gas calibration to replace solution calibration, the proportioning process of gradient water bodies with different dissolved oxygen concentrations in a solution is simplified, so that the calibration flow canbe simplified, the calibration time can be saved, and the accuracy of calibrating a reference oxygen concentration in situ is improved; adopted calibration gas cannot cause atmospheric pollution after diffusing in air; and in-situ self calibration is realized with an important role of improving the quality of data monitored with the dissolved oxygen sensor in situ and prolonging the in-situ maintenance-free running time.

Description

technical field [0001] The invention relates to the field of dissolved oxygen sensor calibration, and discloses an in-situ self-calibration device and method for an optical dissolved oxygen sensor. Background technique [0002] Dissolved oxygen is an important indicator to measure the quality of seawater and the degree of water pollution. It is the most important monitoring indicator in seawater besides temperature and salinity. It can have an important impact on marine life activities and marine aquaculture. An important basis for evaluation and marine science experiments. The measurement and analysis of dissolved oxygen generally adopts the Winkler analysis method, but this method is cumbersome, time-consuming and labor-intensive. Timely and effective monitoring of marine dissolved oxygen cannot form long-term continuous and large-scale marine dissolved oxygen data, let alone meet the data requirements for marine environmental monitoring and early warning. At present, th...

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Problems solved by technology

[0003] Although the optical dissolved oxygen sensor has been widely used in various mobile and fixed monitoring platforms, and has passed strict calibration before leaving the factory, it will have some problems during the in-situ monitoring process due to the photolysis of the film, bio-adhesion and other reasons. Data drift, so it needs to be calibrated to ensure the accuracy and reliability of the monitoring data

However, the current general calibration method for dissolved oxygen sensors is only a laboratory calibration method, lacking a method for in-situ self-calibration of optical dissolved oxygen sensors, and the laboratory calibration method has a long calibration period, which is time-consuming and laborious, and the sensor needs to be taken back to land for experiments Manual calibration in the laboratory affects the continuity of the monitoring data of the dissolved oxygen sensor and cannot meet the urgent needs of the dissolved oxygen sensor for in-situ self-calibration

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