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《Electronic Measurement Technology》 2006-03
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High precision measurement system with signal insulation

Liu Lele Wang Zulin (Beijing University of Aeronautics and Astronautics, 201 Staff Room, Beijing, 100083)  
In this article, a precision measure system is presented. Especially, a method to simplify signal insulation is given. This goal is approached by migrating the insulation circuit. A valuable way to raise the measure precision and to correct system error was demonstrated. It has been proved that design of the system has given attention to both low cost and high performance.
【CateGory Index】: TP274.4
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7 CHEN Hongyuan , CAI Chenxin and JU Huangxian (Department of Chemistry, Nanjing University, Nanjing 210093, China) The array device prepared by the above procedure was rinsed thoroughly with water. The electrochemical characteristics of the PPy/DP/IDA were investigated in phosphate bufffer solution. At the start of each measurement the device was held at + 0.1 V for about 30 s to oxidize the polypyrrole, the device was disconnected from the potentiostat and a bias of 20 mV was applied between the two sets of microeleetrodes, then NADH was added. The ID, flowing through the polypyrrole between the two sets of microeleetrodes, was recorded as a function of time and the effect of NADH concentration on the device "on-off" time was investigated. 2 Results and discussion 2.1 Characteristics of PPy/DP/IDA device The basic principle of the PPy/DP/IDA device and its response to NADH are shown in fig. 2. Fig. 3 depicts the ID vs. VG plot for the PPy/DP/IDA device, which was obtained by changing the value of voltage VG, at the same time /D was measured (VD = 20mV was maintained). The polypyrrole is practically an insulator at the value of VG below -0.2V, and there is no current flowing between the two sets of arrays of IDA electrode, i.e. ID=0 and the PPy/DP/IDA device is in "off" state. When the VG is higher than -0.1 V, there is a current flowing between the IDA electrodes. The conductance of the polypyrrole increases with the increasing value of VG and keeps almost constant when its value is above +0.1V. At this time, the polypyrrole is in oxidized form and conductive, and the PPy/DP/IDA device is in "on" state. 2.2 Response of PPy/DP/IDA device to NADH The ID vs. VD characteristic of PPy/DP/IDA device (fig. 3) indicates that the chemical reducing agents with formal potential less than -0.2V can potentially reduce the polypyrrole from conductive state to insulating state and thus turn the PPy/DP/IDA device from "on" state to "off" state, consequently the PPy/DP/IDA;Biomolecular sensor based on a polypyrrole-coated microelectrode array[J];科学通报(英文版);1996-17
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