Signal collecting and processing apparatus for ion chromatograph

An ion chromatograph and signal acquisition technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of lowering the grade of instruments, large difference ratio of component concentrations, and failure to effectively use amplifiers to suppress common mode noise, etc., to achieve expansion Measuring range, effect of preventing damage to the instrument

Inactive Publication Date: 2004-11-24
XIAMEN UNIV
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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 res

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  • Signal collecting and processing apparatus for ion chromatograph
  • Signal collecting and processing apparatus for ion chromatograph
  • Signal collecting and processing apparatus for ion chromatograph

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Embodiment Construction

[0038] Such as figure 1 Shown, the present invention is provided with excitation pulse generation circuit 1, is used to produce two roads and is the excitation pulse signal of antiphase mutually; Conductivity cell 2, its two electrodes connect the output end of excitation pulse generation circuit, for generating solution conductance signal; Weak signal amplifying circuit 3, its input terminal is connected to the solution conductance signal output terminal at both ends of the conductivity cell; sample and hold circuit 4, its input terminal is connected to the output terminal of the weak signal amplifying circuit, and is used for peak detection of the solution conductance signal; secondary amplification Circuit 5, its input terminal is connected to the output terminal of the sample and hold circuit, and is used to amplify the solution conductance signal; A / D acquisition circuit 6, its multi-channel acquisition switch circuit input terminal is connected to the output terminal of t...

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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...

Claims

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Application Information

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IPC IPC(8): G01N30/86
Inventor 许茹江正梁陈淑武周志有林水潮陈华宾胡晓毅解永军
Owner XIAMEN UNIV
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