Optical dissolved oxygen sensor

Abstract

The invention relates to the technical field of measurement of sensors and in particular discloses an optical dissolved oxygen sensor. The optical dissolved oxygen sensor comprises a fluorescence measurement module for acquiring a dissolved oxygen signal of a water body, a temperature measurement module for acquiring a temperature signal of the water body, a transducer electronic data sheet (TEDS) storage device for storing TEDS parameters which include a calibration compensation parameter reflecting the relation between temperature and dissolved oxygen, and a micro-processor connected with the fluorescence measurement module, the temperature measurement module and the TEDS storage device for performing analog-digital conversion processing on a dissolved oxygen voltage signal and a temperature voltage signal and generating a dissolved oxygen value by calculation processing according to the calibration compensation parameter. The optical dissolved oxygen sensor can realize temperature compensation of the measured dissolved oxygen, improve the measurement precision of the dissolved oxygen and realize on-line detection of the dissolved oxygen of water quality.

Description

technical field [0001] The invention relates to the technical field of sensor measurement, in particular to an optical dissolved oxygen sensor. Background technique [0002] Dissolved oxygen refers to oxygen dissolved in the molecular state of water, which is an indispensable condition for the survival of aquatic organisms. The dissolved oxygen in natural water is close to the saturation value (9ppm), and when the algae multiply vigorously, the dissolved oxygen content decreases. Water bodies polluted by organic matter and reducing substances can reduce dissolved oxygen. For aquaculture, water body dissolved oxygen has a vital impact on the survival of aquatic organisms such as fish. When dissolved oxygen is lower than 4mg / L, it will It will cause fish to suffocate and die. For humans, the dissolved oxygen content in healthy drinking water should not be less than 6mg / L. When the dissolved oxygen consumption rate is greater than the rate at which oxygen dissolves into the w...

AI Technical Summary

Problems solved by technology

[0003] In recent years, optical fiber oxygen measurement devices based on fluorescence quenching technology and optical fiber technology can be used for on-site detection of dissolved oxygen in water, but such devices require expensive silica optical fibers for light transmission, and the optical fibers are easy to break and inconvenient to carry

There are other dissolved oxygen measurement devices that integrate water control devices, cables and sensor probes. Although the sensor probes can work offline and independently, they need to be recovered and connected to a PC to obtain measurement data, and data acquisition still requires manual operations. , unable to realize real-time online monitoring

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