Fluorescence-method dissolved oxygen sensor

Abstract

The invention discloses a fluorescence-method dissolved oxygen sensor, which comprises a measuring light path, a signal processing circuit, a shell body, an outgoing cable and a temperature sensor, wherein the measurement light path comprises a fluorescent film, an optical filter, a photoelectric detector, an excitation light source and a reference light source; the fluorescent film comprises a waterproof breathable film, a fluorescent layer and a colorless transparent glass sheet, the inner surface of the waterproof breathable film is coated with the fluorescent layer, and the colorless transparent glass sheet is bonded to the inner surface of the fluorescent layer; the fluorescent film is located at the head part of the shell body, the optical filter is located between the fluorescent film and the photoelectric detector, and the photoelectric detector is located behind the optical filter and connected with the signal processing circuit; the reference light source and the excitation light source are fixed on two sides in the shell body and are positioned on the same horizontal plane with the optical filter; and the temperature sensor is arranged on the inner wall of the shell bodyand is fixed between the optical filter and the fluorescent film. According to the fluorescence-method dissolved oxygen sensor, the fluorescent film can be prevented from falling off, much diffused light and secondary reflection are avoided, and the measurement precision and stability are improved.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a fluorescent dissolved oxygen sensor. Background technique [0002] Dissolved oxygen refers to molecular oxygen dissolved in water. In water quality monitoring, the content of dissolved oxygen in water reflects the degree of water pollution to a certain extent. When the dissolved oxygen in the water is too low, anaerobic bacteria multiply rapidly, leading to the corruption of organic matter and the deterioration of water quality. At the same time, due to the lack of oxygen in the water, the fish and shrimp in the water will die due to lack of oxygen. Therefore, dissolved oxygen is regarded as one of the important parameters for water quality evaluation. The less dissolved oxygen, the more serious the pollution. [0003] The dissolved oxygen detector is an instrument for measuring dissolved oxygen in water. It is functionally divided into off-line and on-line. The f...

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Problems solved by technology

[0005] In view of this, the present invention provides a fluorescent dissolved oxygen sensor, which solves the problems that the fluorescent film is easy to fall off, the optical reaction chamber has a lot of astigmatism, and the secondary reflection interferes with the accuracy of the measurement. By measuring the temperature in the optical reaction, the temperature compensate

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