HANDMADE OXYGEN SENSOR AND ITS APPLOCATION FOR SCIENC EDUCATION

手工制作的氧传感器及其在科学教育中的应用

基本信息

批准号：
09680200
负责人：
TAKAHASHI Mitsuo
金额：
$ 1.79万
依托单位：
Tokyo National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

Introduction Chemical sensor would be a useful device for arousing young pepole's rnterrest in science. We preparerd a handmade oxygen sensor for measuring oxygen concentration, supplementing necessary parts by use of convenient tools.Experimental Electrochemical oxygen sensor can be assembled using two kinds of metal plates, a conventional plastic film that is permeable to oxygen, and an electrolyte. A gold plate as the cathode, a lead plate as the anode, a polyethylene film as the oxygen permeable film, and 0.1M or 0.2M NaHCO_3 solution containing sodium alginate as the electrolytic solution were used in this experiment. The sensor is called as Clark electrode. The reduction current of the sensor was measured by use of a resistor.Results and Discussion As it seem to be difficult for students to be make the body which consists of two metal plates and plastic material, we prepared it. A strong base solution is used as the electrolyte in most commercially available oxygen sensors, but this is dangerous for children. Aqueous NaHCO_3 solution is safe as electrolytic solution and showed a good performance. Sodium alginate in the solution is necessary to keep the electric contact between gold and lead electrodes.The relationship between the voltage of the sensor and oxygen concentration showed a good linearity in the range from 0 to 100% of oxygen. We can easily assemble the oxygen sensor, houever, the response of the sensor depends on our personal skill. The sensor signal was stored in a personal computer system through an AD converter. When the flame of the candles died out, the output of the sensor showed an oxygen concentration of around 17%. This system for oxygen measurement was considered to be useful in science educatin.

引言化学传感器将是激发年轻人对科学兴趣的有用装置。我们准备了一个手工制作的氧传感器，用于测量氧浓度，并使用方便的工具补充必要的部件。实验电化学氧传感器可以使用两种金属板、传统的可渗透氧气的塑料薄膜和电解质来组装。本实验采用金板作为阴极，铅板作为阳极，聚乙烯膜作为透氧膜，电解液为含有海藻酸钠的0.1M或0.2M NaHCO_3溶液。该传感器称为克拉克电极。使用电阻器测量传感器的还原电流。结果与讨论由于学生似乎很难制作由两块金属板和塑料材料组成的主体，因此我们准备了它。大多数市售氧气传感器都使用强碱溶液作为电解质，但这对儿童来说是危险的。 NaHCO_3水溶液作为电解液是安全的并且表现出良好的性能。溶液中的海藻酸钠是保持金电极和铅电极之间的电接触所必需的。传感器的电压与氧气浓度之间的关系在氧气的0%至100%范围内表现出良好的线性关系。我们可以很容易地组装氧气传感器，但是传感器的响应取决于我们个人的技术。传感器信号通过AD转换器存储在个人计算机系统中。当蜡烛的火焰熄灭时，传感器的输出显示氧气浓度约为17%。该氧气测量系统被认为对科学教育有用。