Signal collecting and processing apparatus for ion chromatograph

Abstract

The signal acquiring and processing device includes pulse generating circuit, conducting pool with two electrodes connected to the output of the pulse generating circuit, weak signal amplifying circuit, sampling and holding circuit, secondary amplifying circuit, A / D sampling circuit, monochip computer processing circuit, and output display circuit connected together. The present invention adopts pulse signal excitation and sync multi-point sampling, and utilizes the equivalent circuit of conducting electrode in solution to solve pulse responding math equation, obtain solution conductivity and double-layer capacitance value and expand the detection range of the conducting detector. The present invention is suitable for the sample analysis with great component concentration ratio, and can avoid outer interference and instrument damage caused by maloperation.

Description

(1) Technical field [0001] The invention relates to a signal acquisition and processing circuit, in particular to a signal acquisition and processing device for an ion chromatograph. (2) Background technology [0002] Ion chromatography is a new type of liquid chromatography developed after the 1970s. This technology has developed rapidly and has become a powerful tool for the separation and detection of different anions and cations. Existing ion chromatograph signal acquisition and processing devices, such as IC-6 type ion chromatograph (Qingdao Laoshan Electronic Instrument General Factory) and YIC-8 type ion chromatograph (Qingdao Hi-Tech Park Yitong Instrument Research Institute) basically adopt In the two-electrode structure, a sampling resistor is connected in series with the front-end conductivity cell, and the amplifier takes the signal from the sampling resistor. This method does not effectively use the advantage of the differential input of the amplifier to suppre...

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Problems solved by technology

Existing ion chromatograph signal acquisition and processing devices, such as IC-6 type ion chromatograph (Qingdao Laoshan Electronic Instrument General Factory) and YIC-8 type ion chromatograph (Qingdao Hi-Tech Park Yitong Instrument Research Institute) basically adopt Two-electrode structure, a sampling resistor is connected in series with the front-end conductivity cell, and the amplifier takes the signal from the sampling resistor. This method does not effectively use the advantage of the differential input of the amplifier to suppress common-mode noise

Because the signal of the conductivity cell is very weak, and the concentration ratio of the components is very large, the existing acquisition system basically uses manual gear shifting in order to expand the range, which increases the complexity of the operation and reduces the grade of the instrument

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