Small-signal sectional fitting temperature compensation method of water quality sensor

A water quality sensor and temperature compensation technology, applied in the field of small signal processing, can solve the problems of making materials and structures easily affected by temperature, reducing the measurement accuracy of water quality parameters, etc.

Active Publication Date: 2014-12-03
SOUTH CHINA AGRI UNIV
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Problems solved by technology

In addition, the materials and structures of water quality sensor electrodes are easily affected by temperature, thus reducing the accuracy of water quality parameter measurement. Th

Method used

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  • Small-signal sectional fitting temperature compensation method of water quality sensor
  • Small-signal sectional fitting temperature compensation method of water quality sensor
  • Small-signal sectional fitting temperature compensation method of water quality sensor

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Embodiment

[0037] Such as figure 1 As shown, a water quality sensor small signal segmented fitting temperature compensation method uses a software temperature compensation method to compensate the pH electrode temperature, and at the same time improves the measurement accuracy.

[0038] The principle of segmented fitting is as follows: pH composite electrode is composed of calomel electrode and glass electrode. In the measurement, the glass electrode is used as the indicator electrode, and the calomel electrode is used as the reference electrode. The electromotive force between the indicator electrode and the reference electrode reflects the pH change in the solution. The head bulb of the glass electrode of the composite electrode is made of a sensitive film that is only sensitive to hydrogen ions. It is used as an indicator electrode in acidity measurement, and the calomel electrode is used as a reference electrode. The reference electrode is installed in the glass in the plastic case In t...

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Abstract

The invention discloses a small-signal sectional fitting temperature compensation method of a water quality sensor, relates to the technical field of small signal processing, and in particular relates to a sectional fitting method which can realize a fitting effect for improving the measure accuracy, reducing the measure data conversion error and fitting a nonlinear curve to improve the measure precision. The method comprises the following steps of establishing a mathematic model by adopting a sectional linear fitting method, dividing a pH temperature coefficient KpH calibration curve into a plurality of intervals, fitting a corresponding linear equation by adopting a least square method, calculating the linear fitting precision, re-dividing the intervals to perform the fitting if the precision is lower than a threshold value until the precision meets the requirement, and further realizing the temperature compensation. A simple, rapid and precise mathematic model is adopted, so that the data acquisition accuracy can be effectively improved.

Description

Technical field [0001] The present invention relates to the technical field of small signal processing, in particular to a temperature compensation method for water quality sensor small signal segmented fitting. Background technique [0002] In the process of water quality parameter measurement, although its measurement circuit realizes the acquisition of the sensor's weak signal, its output voltage cannot reflect the mathematical relationship with the physical quantity of the measured object. It is necessary to establish a related mathematical model to realize the output of the water quality parameter measurement circuit. The conversion between voltage and the physical quantity of the measured object. In addition, the material and structure of the water quality sensor electrode are susceptible to temperature, which reduces the accuracy of water quality parameter measurement. Therefore, when establishing a mathematical model for water quality parameter measurement, the effect of ...

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Application Information

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IPC IPC(8): G01N27/26
Inventor 王卫星姜晟胡月明孙道宗吕石磊李亮斌
Owner SOUTH CHINA AGRI UNIV
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