基于单片机的便携式甲醛检测仪设计毕业设计论文 - 图文 联系客服

发布时间 : 星期四 文章基于单片机的便携式甲醛检测仪设计毕业设计论文 - 图文更新完毕开始阅读8aa32da65ff7ba0d4a7302768e9951e79b89692b

毕业设计(论文)

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系 (院)专 业 班 级 学生姓名 学 号 指导教师 职 称

基于单片机的便携式 甲醛检测仪设计

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本人郑重声明:所呈交的毕业设计(论文),是本人在指导老师的指导下,独立进行研究工作所取得的成果,成果不存在知识产权争议。据我所知,除文中已经注明引用的内容外,本设计(论文)不含任何其他个人或集体已经发表或撰写过的作品成果。对本文的研究做出重要贡献的个人和集体均已在文中以明确方式标明。

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毕业设计(论文)

基于单片机的便携式检测仪设计

摘 要

甲醛是一种无色,有强烈刺激性气味的气体。易溶于水、醇和醚。甲醛在常温下是气态,通常以水溶液形式出现。易溶于水和乙醇,35~40%的甲醛水溶液叫做福尔马林。甲醛是原浆毒物,能与蛋白质结合,会对人体造成很大伤害。

当前,市场上甲醛检测仪的种类是很多,其中采用方法比较常用的是试验纸光电光度法。对于试验纸光电光度法来分析甲醛的浓度,它的优点是灵敏度比较高,操作野比较简单,并且测定速度也比较快。但是由于这种方法在分析甲醛浓度时常常采用的是目视比色法,目视比色法的缺点是:准确度不高,如果待测液中存在第二种有色物质,可能的会无法进行测定。另外,由于许多有色溶液颜色不稳定,标准系列不能长期存放,经常需要在测定的时候现场配制,比较麻烦。

本次设计所研究的是基于单片机的便携式甲醛检测仪设计,选用的是基于电化学原理的甲醛传感器,它的原理是:空气中的甲醛在电极下发生氧化反应,产生的扩散电极电流与空气中的甲醛浓度成正比,通过检测放大电路和放大倍数的调整,再经过A/D转换然后送达单片机 ,之后由单片机进行现场自动控制检测并显示甲醛的实时浓度。

本次设计所设计的这种检测仪具有体积小,重量轻,操作简单,界面友好,可扩展性和灵活性高等特点,能够实现低成本实时检测。 关键词:甲醛,单片机 ,甲醛检测仪,甲醛传感器

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毕业设计(论文)

According to list slice machine then the hold type

examination instrument design

Summary

The formaldehyde is a kind of to have no color, there is the air of severely stimulating smell.It easily Be dissolved to water, Chun and ether.The formaldehyde is a gas under the normal temperature, usually appear by aqueous solution form.Easily Be dissolved to water and the ether, 35~40% formaldehyde aqueous solutions are called blessing Er Ma Lin.The formaldehyde is original syrup poison, can combine with protein, will result in to hurt very greatly to the human body.

At present, the category of formaldehyde examination instrument is a lot of, adopt a method among them on the market experimenting the paper optoelectronics intensity of light method is iner common use.For experiment the paper optoelectronics intensity of light method to analyze the density of formaldehyde, its advantage is that the intelligent degree is higher, operates wild more simple, and measurese speed also quicker.But because of this method at analytical formaldehyde density often often what to adopt is eyes to see to compare a color method, the eyes see the weakness of comparing the color method BE:The accurate degree isn't high, if treat to measure to exist the second to contain color material in the liquid, probably of the meeting can not carry on a measurement.Moreover, unsteady because of many colors with color aqua, the standard series can not deposit over a long period of time and usually need the time in measurement and prepare on the scene, more troublesome.

What this design studies is according to list slice machine of then hold type formaldehyde examination instrument design, choice of is according to electricity chemistry principle of the formaldehyde spread a feeling machine, its principle BE:The formaldehyde in the air takes place to oxidize reaction under the electrode and produce of proliferation electrode electric current and the formaldehyde density in the air become direct proportion, pass examination to enlarge electric circuit and enlarge the adjustment of multiple, again after A|D conversion then send to list slice machine, after from list slice the machine carry on on the scene automatically control to examine and show a

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