Surface water conductivity non-contact measurement device and method

Abstract

The invention discloses a surface water conductivity non-contact measurement device and method. In the invention, an alternating current signal is output by an alternating current excitation source and is applied to an excitation electrode on the outer bottom side of a floating box through an induction module; a current signal reflecting the surface water conductivity information is obtained by a detection electrode; the current is amplified by a signal processing circuit, and is rectified and filtered to obtain a direct current voltage signal which is easy to measure; and a relational model of the conductivity and the output direct current voltage is established. According to the correspondence of the conductivity and the voltage, a surface water conductivity value can be obtained. In the invention, the influence of coupling capacitance on conductivity measurement is effectively eliminated by using a serial resonance method; and the device and the method can be used for measuring surface water conductivity. The device has the advantages of simple structure, no contact of the electrode and the surface water, high anti-interference capacity, low cost and the like; and an effective method is provided for outdoor long-term on-line detection of the conductivity of the surface water.

Description

technical field [0001] The invention relates to conductivity detection technology, in particular to a non-contact measurement device and method for surface water conductivity. Background technique [0002] Surface water conductivity is an important basic parameter reflecting water quality, and its continuous real-time online detection is of great significance to water environment monitoring. The surface water conductivity detection system is in the field. To complete the long-term online detection task, the sensor needs to be less affected by plankton or other impurities in the water, and less disturbed by drifting objects such as fallen leaves and garbage bags. And there are fewer manual inspections, cleaning and maintenance requirements. Therefore, the online real-time detection of surface water conductivity puts forward higher requirements for sensors. [0003] At present, the main methods of water conductivity detection are divided into electrode method and electromagn...

AI Technical Summary

Problems solved by technology

The electrode method has a wide range of applications, from solutions with very small conductivity to general aqueous solutions, but the electrodes are in direct contact with the liquid, and the electrodes are easily polluted, oxidized and corroded, and the measurement sensitive space is often partially closed, floating in water Organisms are easy to attach and breed in the measurement space, affecting the measurement accuracy, requiring regular cleaning, and the burden of field maintenance is heavy

The electromagnetic induction method is non-contact measurement, has no polarization effect, has the advantages of high corrosion resistance, wide measurement range, etc., but the structure is relatively complicated, and it is not suitable for the measurement of aqueous solutions with low conductivity.

Therefore, these methods are difficult to fully meet the requirements of surface water conductivity detection, and it is necessary to design a detection system with a new principle to meet the application requirements.

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