High-precision portable front-end device for electrochemical detection

Abstract

The invention discloses a high-precision portable front-end device for electrochemical detection. The device comprises a forward voltage follower circuit, an RE-CE electrode based on the forward voltage follower circuit, a current-voltage conversion circuit, a WE electrode based on the current-voltage conversion circuit and a three-ring opposite vertex cross negative feedback amplifier. Accordingto the three-ring opposite vertex cross negative feedback amplifier, an output node of a negative feedback circuit formed by A1 is connected with an output node of a negative feedback circuit formed by A2, and the two nodes are combined to form an opposite vertex ring; an output node of the negative feedback circuit formed by A2 is connected with an in-phase input node of the negative feedback circuit formed by A3, an anti-phase input node of the negative feedback circuit formed by A3 is connected with an anti-phase input node of the negative feedback circuit formed by A2, and the two nodes are combined to form a cross ring. By means of the arrangement, compared with a traditional amplifying circuit, the noise level is lower, the signal bandwidth is larger, and the testing precision of a traditional electrochemical detector is improved.

Description

technical field [0001] The invention belongs to the field of electrochemical detection, and in particular relates to a high-precision portable front-end device for electrochemical detection. Background technique [0002] Electrochemical detectors measure the electrical signal changes of substances. For compounds with redox properties, such as organic compounds containing nitro and amino groups, and inorganic anions and cations, electrochemical detectors can be used, including polarographic, coulombic, and amperometric and conductivity detectors, etc. The first three are collectively called voltammetry detectors, which are used for the detection of compounds with redox properties. The conductivity detector is mainly used for ion detection, and its working principle is: a constant potential is applied between the two electrodes. When the electroactive component passes through the electrode surface, a redox reaction (electrode reaction) occurs, and the magnitude of the electri...

AI Technical Summary

Problems solved by technology

The conductivity detector is mainly used for ion detection, and its working principle is: a constant potential is applied between the two electrodes. When the electroactive component passes through the electrode surface, a redox reaction (electrode reaction) occurs, and the magnitude of the electric quantity (Q) conforms to Faraday's law, the existing electrochemical detectors have weak anti-interference, poor stability, low detection accuracy, large detection noise and low gain

In traditional detection, electrochemical experimental devices with large volumes are often used, which are difficult to meet the needs of experimenters using the device in different occasions (not to mention the large amount of manpower and material resources consumed during the moving process, the secondary construction of the device after moving, The process of debugging and so on is also very complicated

Images