Abstract
Dissolved oxygen sensor is the key of dissolved oxygen measurement and it is usually implemented by electrochemical method, which measures dissolved oxygen content by the diffusion rate of molecular oxygen through film. However, the film on the electrochemical sensor probe is most likely to be blocked up by the waterborne contaminant, which may reduce the service life of the sensor and the indirect influence on the sensor’s current. This is caused by changes of water temperature, which may lead to the decline in the accuracy of the sensor’s output. This paper suggests a new method to implement the intelligent dissolved oxygen sensor. Our method mainly aims at ultrasonic automatic cleaning, automatic adjustment, and adaptation for the changes of temperature, which can not only regularly clean the dissolved oxygen sensor probe but also automatically calibrate the instruments based on the changes of temperature by combining software and hardware. The experiments show that the ultrasonic cleaning technology can not only increase the service life of the sensor by cleaning the film on the probe safely and effectively but also improve the accuracy of the sensor’s output. Our method also has the advantages of simple structure, high accuracy of measurement, long service life, convenience, and stability, which is suitable for application and popularization.
Highlights
IntroductionDissolved oxygen [1] is a main parameter to characterization of water environment quality and an essential condition for the survival of higher aquatic animals such as fish. e dissolved oxygen measurement is of great significance for the environmental monitoring and the development of aquaculture
Dissolved oxygen [1] is a main parameter to characterization of water environment quality and an essential condition for the survival of higher aquatic animals such as fish. e dissolved oxygen measurement is of great significance for the environmental monitoring and the development of aquaculture.e common methods of dissolved oxygen measurement are iodimetry [2, 3], current measurement (Clark dissolved oxygen electrode) [4, 5], fiber-optic fluorescence quenching [6,7,8], and so on
Iodimetry is a classical method of dissolved oxygen measurement with high accuracy, but since it is timeconsuming and laborious, it is unsuitable for online monitoring
Summary
Dissolved oxygen [1] is a main parameter to characterization of water environment quality and an essential condition for the survival of higher aquatic animals such as fish. e dissolved oxygen measurement is of great significance for the environmental monitoring and the development of aquaculture. Iodimetry is a classical method of dissolved oxygen measurement with high accuracy, but since it is timeconsuming and laborious, it is unsuitable for online monitoring. Since the sensor solves the online measurement problem of dissolved oxygen and it is simple, fast, and not easy to be affected by chromaticity of water, turbidity of water, and impurities, it is widely used in water quality environmental measurement. In order to solve the above problems and improve the accuracy of measurement, this paper suggests a new design of dissolved oxygen sensor based on ultrasonic self-adaption and self-cleaning. Is novel dissolved oxygen sensor with cleaning mechanism and automatic calibration solves the problem of pollution and blockage, which leads to the continuous decrement of the sensitivity of probe, improves the accuracy of measurement, and produces a barrier-free dissolved oxygen sensor with long service life and high precision In order to solve the above problems and improve the accuracy of measurement, this paper suggests a new design of dissolved oxygen sensor based on ultrasonic self-adaption and self-cleaning. is novel dissolved oxygen sensor with cleaning mechanism and automatic calibration solves the problem of pollution and blockage, which leads to the continuous decrement of the sensitivity of probe, improves the accuracy of measurement, and produces a barrier-free dissolved oxygen sensor with long service life and high precision
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