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Ion chromatography digital conductance detecting device based on digital signal processor (DSP)

A conductivity detection and ion chromatography technology, applied in the field of electrochemical measurement, can solve the problems of low linear range, large noise and drift, etc., to achieve the effect of improving linearity and sensitivity, good anti-noise performance, and ensuring accurate synchronization

Active Publication Date: 2013-01-02
ANHUI WAYEE SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention aims to provide a DSP-based ion chromatography digital conductance detection device with a wide detection range and high precision sensitivity, which solves the peak delay, low linear range, noise and Large drift and other problems, comprehensively improve the performance of ion chromatography detectors

Method used

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  • Ion chromatography digital conductance detecting device based on digital signal processor (DSP)
  • Ion chromatography digital conductance detecting device based on digital signal processor (DSP)
  • Ion chromatography digital conductance detecting device based on digital signal processor (DSP)

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Embodiment Construction

[0037] Such as figure 1 , 2, 3, the DSP-based ion chromatography digital conductance detection device includes a digital conductance detector circuit board 1 and a conductance detection cell, and the circuit of the digital conductance detector circuit board 1 includes a digital signal processor DSP8, a digital-to-analog converter 9 , low-pass filter 10, digital-to-analog converter 11, low-pass filter 12, input buffer circuit 13, input buffer circuit 14, electrode current detection and amplification circuit 15, electrode voltage detection and amplification circuit 16, low-pass filter Device 17, low-pass filter 20, ADC drive circuit 18, ADC drive circuit 21, high-speed ADC circuit 19, digital signal processor DSP8 and digital-to-analog converter 9, low-pass filter 10 constitute excitation sinusoidal signal generation circuit, digital signal The processor DSP8, the digital-to-analog converter 11, and the low-pass filter 12 form an adjustment sinusoidal signal generating circuit...

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Abstract

The invention discloses an ion chromatography digital conductance detecting device based on a digital signal processor (DSP). The ion chromatography digital conductance detecting device comprises a digital conductance detector circuit board and a conductance detecting pond. Traditional thought of the ion chromatography digital conductance detecting device is abandoned from a measuring circuit and signal processing, digital programmable sine alternating current exciting signals are generated through the DSP and exerted on a conductance sensor, and electrode voltage and current are detected through I / V current detecting based on a microcurrent operational amplifier and a differential voltage detecting method with buffering input. By means of direct alternating current synchronous sampling, conductance signals are extracted out through a digital sine phase sensibility demodulation method through the DSP. In addition, real-time conductance rate of a solution can be output after temperature compensation. The ion chromatography digital conductance detecting device effectively improves flexibility and precision of ion chromatography conductance detecting, increases detecting range of the ion chromatography digital conductance detecting device, and reduces system noise and baseline drift.

Description

technical field [0001] The invention relates to the field of electrochemical measurement, in particular to a DSP-based ion chromatography digital conductance detection device. Background technique [0002] Ion chromatography conductivity detectors are based on Kohlraush's law and Ohm's law. Such as image 3 As shown, in theory, we only need to test the voltage U of the detection electrode and the current I flowing through the detection electrode to obtain the conductance G=I / U of the solution. Polarization, wire resistance, distributed capacitance, etc., especially when measuring low-concentration samples, these factors have a great influence. The actual conductance signal will be submerged in the noise signal and cannot be accurately measured. As ion chromatography is more and more widely used, the requirements for sensitivity, detection range, noise and drift of ion chromatography are getting higher and higher. At present, the traditional detection method and device of io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/64
Inventor 杨鑫盛
Owner ANHUI WAYEE SCI & TECH CO LTD
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