Method and device for eliminating signal noise of conductivity analyzer

Abstract

The invention discloses a method and device for eliminating signal noise of a conductivity analyzer. The device comprises a conductivity signal amplification circuit, a baseline deduction circuit andan adaptive circuit, the adaptive circuit comprises a single-chip microcomputer and a digital potentiometer, the input end of the conductivity signal amplification circuit is connected with a conductivity sensor, the conductivity signal amplification circuit is connected with the positive phase input end of a comparison circuit in the baseline deduction circuit, the negative phase input end of thecomparison circuit is connected with a digital potentiometer, and the output end of the comparison circuit is connected with a signal processing circuit; and a dark current detection device is arranged in the conductivity sensor, the dark current detection device is connected with the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected withthe digital potentiometer. The device and the method have the advantages and beneficial effects that the digital potentiometer is used for replacing a mechanical potentiometer, and the resistance value of the digital potentiometer can be controlled through the real-time change of dark current, so that the deducted baseline is adjusted in real time, and the accuracy degree of baseline deduction isensured.

Description

technical field [0001] The invention relates to the technical field of conductivity analysis in a water quality analysis system, in particular to a method and a device for eliminating signal noise of a conductivity analyzer. Background technique [0002] Secondary water supply is the "last mile" of water supply for high-level users. Due to its unclear management body and even unmanned management, it is difficult for many management units to ensure regular cleaning and disinfection of secondary water supply facilities. In addition, due to the characteristics of the secondary water supply facility itself, such as facility material, water storage time, external environmental conditions and human factors, it is very easy to produce secondary pollution, which affects the drinking water safety of water users within the water supply range. In view of this situation, in the daily production and living process, real-time analysis of water quality is very necessary. The conductivity ...

AI Technical Summary

Problems solved by technology

[0002] Secondary water supply is the "last mile" of water supply for high-level users. Due to unclear management entities and even unmanned management, it is difficult for many management units to ensure regular cleaning and disinfection of secondary water supply facilities.

[0008] After a lot of research and experiments, the operational amplifier method has good consistency in signal processing and high sampling accuracy; but in the signal processing process, there is a certain amount of noise, which has a certain impact on the final collected analog signal. Interference, the noise seriously affects the test performance of the conductivity analyzer

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