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Dissolved oxygen sensor calibration device and calibration method based on fluorescence quenching principle

A dissolved oxygen sensor and fluorescence quenching technology, applied in the field of measurement, can solve the problems of poor stability, low efficiency and high cost, and achieve the effect of reducing operation difficulty, shortening time, avoiding damage and environmental pollution

Pending Publication Date: 2020-06-05
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention solves the problems of high cost, low efficiency, low precision and poor stability existing in the current calibration method for dissolved oxygen sensors based on the principle of fluorescence quenching to a certain extent.

Method used

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  • Dissolved oxygen sensor calibration device and calibration method based on fluorescence quenching principle
  • Dissolved oxygen sensor calibration device and calibration method based on fluorescence quenching principle
  • Dissolved oxygen sensor calibration device and calibration method based on fluorescence quenching principle

Examples

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Effect test

Embodiment 1

[0058] like figure 1 As shown, the present invention discloses a dissolved oxygen sensor calibration device based on the principle of fluorescence quenching, which includes a plurality of gas cylinders 1 filled with different proportions of oxygen-nitrogen mixed gas, and each gas cylinder is equipped with a main valve 2 connected to the reducing Pressure valve 3 and pressure gauge 4 to control the outlet air pressure; the outlet end of pressure reducing valve 3 is connected to airtight container 6 through pipeline 5; 3-5 temperature sensors 10 are installed in airtight container 6, and through data transmission line 12 and upper position Machine 13 is connected.

[0059] The number of gas cylinders 1 is consistent with the number of calibration points determined earlier. The airtight container 6 is provided with an air inlet 7 and an air outlet 8; wherein the air inlet 7 is connected to the outlet end of the pressure reducing valve 3 through a pipeline 5, and is used to send ...

Embodiment 2

[0066] The present invention also proposes a calibration method for a dissolved oxygen sensor calibration device based on the principle of fluorescence quenching in Embodiment 1. The calibration method specifically includes the following steps:

[0067] S1: According to the experimental conditions and actual application requirements, determine the number of calibration points and the approximate range of the dissolved oxygen concentration corresponding to each calibration point. Different proportions of standard gases are filled in cylinder 1, and the filling pressure is not lower than 5MPa;

[0068] S2: Open the sealing cover of the airtight container 6, put the dissolved oxygen sensor and the temperature sensor 10 to be calibrated into the container, connect the power supply and the communication assembly (the external power line and the data transmission line 12 are drawn from the cable outlet 11), ensure that it can Normal work and normal communication with the upper compu...

Embodiment 3

[0081] This embodiment is a comparative experiment: calibrate three dissolved oxygen sensors based on the principle of fluorescence quenching with the same model and service life, respectively using the two-point calibration method commonly used in the industry, the gas mixing method and the calibration method proposed by the present invention; After the calibration is completed, use three sensors to test the same standard sample multiple times under constant temperature and constant pressure conditions, with an interval of 10 minutes between the two tests, and record the measurement results of each sensor; The sensor is used as a standard reference, and its calibration effect is compared. The measurement results are as follows: figure 2 shown.

[0082] It can be seen that compared with several commonly used calibration methods in the industry, the calibration method proposed by the present invention has significant advantages in the accuracy and repeatability of the measurem...

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Abstract

The invention provides a dissolved oxygen sensor calibration device and calibration method based on a fluorescence quenching principle. The calibration device comprises a plurality of gas cylinders, main valves are arranged on the gas cylinders, the main valves are sequentially connected with a pressure reducing valve and a pressure gauge, the outlet end of the pressure reducing valve is connectedwith a closed container through a pipeline, a plurality of temperature sensors are installed in the closed container, and the other end of the closed container is connected with an upper computer. Onthe premise that the cost is controllable, the operation links are reduced, the calibration time is shortened, the calibration precision meets the requirements of relevant national standards, and theproblems of high cost, low efficiency, low precision, poor stability and the like of a current calibration method for the dissolved oxygen sensor based on the fluorescence quenching principle are solved to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of measurement, and relates to a calibration device and a calibration method for a dissolved oxygen sensor based on the principle of fluorescence quenching. Background technique [0002] Molecular oxygen dissolved in water is called dissolved oxygen. Accurate and rapid determination of dissolved oxygen concentration in water is of great significance to many fields such as chemical production, medical and health care, environmental monitoring, and aquaculture. The concentration of dissolved oxygen in water is related to the partial pressure of oxygen in the air above the water surface, the temperature of the water and the concentration of salt ions in the water body. The dissolved oxygen sensor based on the principle of fluorescence quenching is a kind of measuring equipment that uses the different fluorescence quenching characteristics of special compounds under different oxygen concentrations to detect and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/643G01N21/274G01N2021/6432
Inventor 柳军皮杰徐磊严妮娜蔡浩天蒋希芝张荣钱明艳
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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