Alcohol tester scheme: what principle does the alcohol tester measure alcohol solubility based on?

　　 The alcohol tester scheme is mainly developed according to its own data , Its design is novel and unique , The data acquisition system is mainly controlled by single chip microcomputer , The peripheral circuit is provided with LED Show , It also has a keyboard response circuit , The more convenient thing is that there is no computer at all , It's very convenient to take it with you , At the same time, it can quickly complete the interaction between users , That is, it can quickly detect whether there is alcohol in the user's body . Let's follow Xiaobian to learn more about the detection principle of the alcohol detector ？

　　 What is the principle of alcohol tester to measure alcohol solubility ？

　　1、 Wet chemical method

　　 Its principle is that alcohol vapor is oxidized by acidic potassium permanganate solution , The concentration of ethanol can be inferred from the fading time of the solution , So it is called wet chemical method . The alcohol in the breath is oxidized by a mixture of potassium dichromate and sulfuric acid placed in specially designed vials , The mixture in the bottle will change from orange to green , The resistance change caused by the chemical reaction will also make the pointer move , Accurately indicate the concentration of alcohol in the breath , It is converted into the concentration of blood alcohol by microcomputer .

　　2、 Gas chromatography

　　 Gas chromatography is a kind of chromatography , It's a chromatography using gas as the mobile phase , In separation analysis , High sensitivity 、 Fast 、 Advantages such as less styles required . However, due to the large volume of the equipment, it is generally used for laboratory testing equipment .

　　3、 Electrochemical methods

　　 Electrochemical alcohol tester is also called fuel cell breath alcohol tester , Its principle is that alcohol in exhalation is oxidized to carbon oxide by catalyst ( Or acetaldehyde ) And water release chemical energy , Chemical energy is converted into electric current through an energy converter and passed through an electric voltmeter , The higher the table reading value , The higher the ethanol concentration .

　　4、 Infrared spectroscopy

　　 Its principle is that the infrared absorption spectrum after drinking shows an obvious absorption band , The degree to which infrared rays are absorbed by alcohol molecules , To determine the alcohol content . The infrared spectrum breath alcohol tester has stable 、 Strong anti-interference ability 、 The advantages of high detection accuracy , Generally used for portable analysis equipment , It can be directly used as the basis for law enforcement , It eliminates the need for blood sampling in the past .

　　 Non dispersive infrared （NDIR） The spectral technology platform can quickly detect alcohol 、SO2、NOx、CO、CO2、 Methane and other infrared absorbing substances , The product is stable and reliable . Thanks to rich experience in independent research and development of optical gas sensors , Weill's infrared absorption spectrum measurement technology has been very mature , Not only superior performance , It can also be customized flexibly according to customer needs .

　　5、 Semiconductor sensors

　　 In addition to the methods described above , There is also a semiconductor breath type alcohol tester , Tin oxide semiconductor is used as sensor . This kind of semiconductor device has gas sensing characteristics , When the sensitive gas concentration in the contact gas increases , Its external resistance value decreases . The advantage of semiconductor tester is its small size , The price is low , The disadvantage is poor anti-interference ability . It is usually only used in low demand occasions , Such as self-test , Or general qualitative test .