Water quality sensor

Abstract

The invention discloses a water quality sensor. The sensor comprises a shell and an optical window arranged in the shell. The water quality sensor also comprises an ultraviolet light emitting source and a medium part which is used as the ultraviolet light transmitting medium. The ultraviolet light emitting source and the medium part are configured so as to make at least part of the ultraviolet lights emitted by the ultraviolet light emitting source are completely internally reflected in the optical window. The water quality sensor is provide with an ultraviolet light emitting source, which can emit ultraviolet lights to prevent and eliminate biological stains that may attach on the optical window. Besides, the ultraviolet lights are all confined in the optical window because of the light complete internal reflection, thus the total radiation strength is enhanced, so the water quality sensor can prevent biological pollution for a longer time, and the on-site continuous operation time of the water quality sensor is increased. The water quality sensor has the advantages of simple structure and low cost.

Description

technical field [0001] The invention belongs to the technical field of environmental sensor manufacturing, and in particular relates to a water quality sensor. Background technique [0002] Water quality sensors are used to monitor the quality of water bodies in various environments, and generally include monitoring indices such as turbidity, pH value, dissolved oxygen, conductivity, temperature, and salinity of water bodies. Since the water quality sensor needs to be deployed in the water environment for a long time, it is inevitable that a large amount of biological pollution such as animals and plants may accumulate on the sensor, thereby affecting the accuracy of the sensor. [0003] In the existing design, a variety of methods to prevent the accumulation of biological contamination on the sensor have been developed: the more common one is to assemble a brush or sponge pad driven by a motor on the sensor, and clean the surface of the sensor through mechanical action , b...

AI Technical Summary

Problems solved by technology

Since the water quality sensor needs to be deployed in the water environment for a long time, it is inevitable that a large amount of biological pollution such as animals and plants may accumulate on the sensor, thereby affecting the accuracy of the sensor

[0003] In the existing design, a variety of methods to prevent the accumulation of biological contamination on the sensor have been developed: the more common one is to assemble a brush or sponge pad driven by a motor on the sensor, and clean the surface of the sensor through mechanical action , but its disadvantage is that the volume is large, and the motor consumes a lot of power, and, more fatally, since this type of water quality sensor is usually equipped with an optical window, the brush or pad will cause damage to the optical window while cleaning the sensor. Damage, which seriously affects the normal use of the sensor; another more commonly used method is to use anti-biological pollution coatings, which contain active biocides, such as copper compounds, copper oxide, etc., which are often used to protect sensors However, it cannot be directly applied to the surface of the optical window and cannot directly protect the optical window. Therefore, an additional shielding mechanism is required to protect the optical window, which complicates the design of the sensor and increases the production cost.

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