Multi-parameter disturbance compensating and correcting system and method of optical dissolved oxygen sensor

Abstract

The invention belongs to the technical field of dissolved oxygen sensor compensation and calibration, and discloses a multi-parameter disturbance compensating and correcting system of an optical dissolved oxygen sensor. The multi-parameter disturbance compensating and correcting system comprises a correcting tank, a watertight plug connector connected with the correcting tank, a gas lead-in device, a to-be-corrected dissolved oxygen sensor, a reference dissolved oxygen sensor, a sampling device, a salinity regulating device and a pressure regulating device, wherein the salinity regulating device and the pressure regulating device are arranged on the watertight plug connector. According to the technical scheme adopted by the invention, a gas mixture of different oxygen content is led into the correcting tank in sequence under different water body temperatures, different salinities and different environmental pressures, so that the water body has multiple dissolved oxygen concentrations,the phase value of the to-be-corrected dissolved oxygen sensor is recorded, and environmental parameters of the water body are recorded; the dissolved oxygen standard value is measured by taking a water sample through an iodometric method to calculate a multi-parameter disturbance compensating and correcting coefficient of the to-be-corrected dissolved oxygen sensor, so that automation degree isimproved, sensor calibrating precision, correcting precision and in-situ measuring accuracy are improved, and therefore, the sensor has a wider range of application.

Description

technical field [0001] The invention belongs to the technical field of compensation and calibration of dissolved oxygen sensors, and discloses a high-precision, complex and multi-parameter environmental factor interference compensation correction method and a correction system for optical dissolved oxygen sensors. Background technique [0002] As an important component and control parameter of the marine ecological environment, dissolved oxygen is an important indicator to measure the quality of seawater and the degree of pollution of water bodies. Therefore, in-situ, fast, accurate, stable, and simple detection of the concentration of dissolved oxygen in seawater is of great value for marine ecological environment monitoring, early warning of ecological disasters, and healthy development of marine ranching. At present, the Winkler analysis method for dissolved oxygen is cumbersome, time-consuming and labor-intensive. More importantly, this non-real-time and intermittent det...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above technical problems, to overcome the long calibration cycle of the existing dissolved oxygen sensor environmental factor compensation correction method, the standard value is not accurate enough, the environmental factor correction is single, the correction algorithm model is not accurate enough, the correction result is only applicable to the temperature change sea area, Unable to apply to complex sea areas where multi-parameter environmental factors change, provide a compensation and correction system based on temperature, salinity, depth and dissolved oxygen concentration control devices and a matching multi-parameter environmental factor compensation and correction method, using this method And the device can make the calibrated dissolved oxygen sensor significantly improve the accuracy of in-situ monitoring, especially suitable for in-situ monitoring of dissolved oxygen in complex sea areas with drastic changes in multi-parameter environmental factors

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