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An electrochemical sensor automatic internal calibration system and calibration method

A technology of calibration system and calibration method, which is applied in the direction of scientific instruments, instruments, and material analysis through electromagnetic means, which can solve problems such as low efficiency, loss, and limited calibration effect, and achieve high calibration accuracy and wide calibration range.

Active Publication Date: 2021-12-21
广州钰芯传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above technical solutions have the following limitations: the replacement of sensors increases costs and brings inconvenience; manual intervention is required, and data deviations or even failures cannot be judged in a timely and accurate manner, resulting in misjudgments and even irreparable losses
[0006] Patent CN201 cited 0291057.7 discloses a gas sensor automatic calibration system and its gas sensor calibration method. The sensor is set in the environment of the measured substance with a specific concentration outside, and the sensor is calibrated only by referring to the characteristic values ​​of a single point or a limited number of points. The efficiency is low and the calibration effect is limited, so it cannot be used as a precise and simple calibration method

Method used

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  • An electrochemical sensor automatic internal calibration system and calibration method
  • An electrochemical sensor automatic internal calibration system and calibration method
  • An electrochemical sensor automatic internal calibration system and calibration method

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Effect test

Embodiment 1

[0037] Formaldehyde gas sensor and automatic internal calibration system with redundant electrodes as calibration reference module:

[0038] Such as image 3 As shown, the gas sensor includes a substrate, an electrolyte, an electrode plate, a diffusion film, a casing and a vent hole.

[0039] Such as figure 2 As shown, the gas sensor electrode board includes standard electrodes and redundant electrodes. The electrode pattern, electrode manufacturing process, and electrode catalyst modification process of the two are exactly the same. The electrolyte of the standard electrode and the redundant electrode, the material and process of the diffusion membrane are exactly the same. The difference between the two is that the casing above the standard electrode has vent holes, and the casing above the redundant electrode part does not have vent holes. The redundant electrode part can be considered to be completely sealed and isolated from the outside.

[0040] Since the materials ...

Embodiment 2

[0046] The equivalent circuit is used as the automatic internal calibration system of the electrochemical sensor of the calibration reference module:

[0047] Such as Figure 6 As shown, this embodiment uses an equivalent circuit model as a reference module. The internal structure of the electrochemical sensor remains unchanged. When the sensor is in the initial state, the data acquisition process is started to collect the output data of each frequency point. The equivalent circuit algorithm calculates the equivalent circuit model based on the output data of each frequency point, and solidifies the equivalent circuit parameters into the reference module circuit through adjustable resistance, capacitance, and inductance, and fixes them by physical means to prevent them from happening again. Change.

[0048] After the sensor module is used for a period of time, the parameters change, but the reference module composed of the equivalent circuit does not change. Through the calib...

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Abstract

The invention provides an automatic internal calibration system for electrochemical sensors, comprising: a microprocessor, a sensor module, a reference module, a voltage excitation circuit, an amplification circuit, a digital-to-analog converter, an analog-to-digital converter, a microprocessor and a digital-to-analog The converter is connected to the analog-to-digital converter, the digital-to-analog converter is connected to the voltage excitation circuit, the voltage excitation circuit is connected to the opposite electrode of the sensor module, the analog-to-digital converter is connected to the amplifying circuit, and the amplifying circuit is connected to the working electrode of the sensor module; the reference As a built-in calibration module, the module is consistent with the connection circuit of the sensor module; the invention also relates to an automatic internal calibration method of the electrochemical sensor. The automatic internal calibration system of the electrochemical sensor of the present invention realizes independent judgment and intelligent automatic internal calibration; it can be calibrated while working, and there is no need to place the sensor in the external standard test substance, and the calibration range is wide and the calibration is accurate higher degree.

Description

technical field [0001] The invention relates to an automatic internal calibration system of an electrochemical sensor, and also relates to an automatic internal calibration method of an electrochemical sensor. Background technique [0002] Electrochemical sensors are commonly used sensors in research work and daily life. They are generally used to determine the electrical and electrochemical properties of target molecules or substances for qualitative and quantitative analysis and measurement. They are based on the electrochemical properties of the analyte. A sensor device that converts the chemical quantity of the analyte into an electrical quantity for sensing and detection. [0003] The basic elements of a typical electrochemical sensor are: a working (or sensing) electrode, a counter electrode, and usually a reference electrode. The aforementioned electrodes are attached to the sensor, lined with electrolyte. The electrodes are located on the inner surface of a diffusi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/416
CPCG01N27/4163
Inventor 叶耀斌奚亚男
Owner 广州钰芯传感科技有限公司