Surface acoustic wave type non-contact electric conductivity detector and detection method thereof
A surface acoustic wave device and non-contact technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems affecting the accuracy of detection results and the low sensitivity of non-contact conductivity detection technology, and achieve simple structure, high sensitivity, Ease of use
Inactive Publication Date: 2012-10-03
SHANDONG NORMAL UNIV
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Problems solved by technology
[0007] The purpose of the present invention is to solve the problems of low sensitivity of current non-contact conductivity detection technology, which affects the accuracy of its detection results, etc., to provide a simple structure, easy to use, which can effectively improve the sensitivity of non-contact conductivity detection, so as to achieve Surface acoustic wave type non-contact conductivity detector with advantages of sensitivity similar to contact conductivity detection and detection method thereof
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[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0032] figure 1 It is the overall schematic diagram of the non-contact conductivity detector invented, 1 is the separation channel, such as capillary, chip channel, etc.; 2 is the non-contact detection electrode; 3 is the function signal generator, which can provide sine, square and triangle waves of different frequencies and amplitudes and other AC signal sources, which directly act on the detection electrode system; 4 is a surface acoustic wave device, which is composed of a piezoelectric quartz crystal resonator or a piezoelectric ceramic resonator or a combination thereof; 5 is a sampling resistor, whose resistance value accounts for the total impedance 2-5%; 6 is the detection circuit, its function is to change the AC current signal on the detection electrode into a DC voltage signal, so that the data collector can read out the signal.
[0033] Me...
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Abstract
The invention disclosed a surface acoustic wave type non-contact conductivity detector, which solves the problems that the detection sensitivity is affected by the high impedance of the tube wall in prior non-contact conductivity detection technology. The detector of the invention has simple structure, is convenient to use, and can effectively improve the sensitivity of the non-contact conductivity detection, in addition, the detector of the invention is applicable to the conductivity detection in the capillary ion chromatography, capillary electrophoresis, and microfluidic chip. The detectorof the invention is a conductivity sensing and measuring system composed of a function signal generator, a surface acoustic wave device, at least a pair of non-contact electrodes, and a detection circuit, wherein the conductivity sensing and measuring system is connected with a separate channel, the pair of non-contact electrodes is arranged on the separate channel, one of the non-contact electrodes is connected with the function signal generator via the surface acoustic wave device, the other is connected with the detection circuit via the sampling resistance.
Description
technical field [0001] The invention relates to a surface acoustic wave non-contact conductance detection technology, which can be used in surface acoustic wave non-contact conductance detectors and detection methods in capillary ion chromatography, capillary electrophoresis and microfluidic chips. Background technique [0002] Conductivity detectors have been widely used as ion chromatography detectors. The current commercial ion chromatography conductivity detectors are contact sensing detection, which has advantages in the detection of ionic compounds, especially for amperometric detection with low electrical activity and weak optical absorption. The detection of some small inorganic cations and anions is very effective and is a standard detector in conventional ion chromatography. In recent years, ion chromatography has made great progress in the preparation of miniaturized chromatographic columns. However, with the reduction of the inner diameter of the chromatographic ...
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IPC IPC(8): G01N27/02G01N30/64
Inventor 申大忠康琪胡强杨修文
Owner SHANDONG NORMAL UNIV