The World Health Organization's accident survey shows that about 50%-60% of traffic accidents are related to drunk driving, and drunk driving is listed as the main cause of death in traffic accidents. Drunk driving has drawn attention all over the world. The alcohol detector is used as a detection tool to detect whether the driver drinks alcohol or how much alcohol content in the body after drinking, which can reduce traffic accidents.
▲ MQ303B alcohol sensor
In Japan, from October 2022, companies that use multiple "white license plate" (private car) vehicles to transport their own goods will be obliged to use an alcohol tester every day to confirm whether the driver is drinking. How does the alcohol tester determine whether the driver is drinking? This depends on the alcohol sensor, which does not require the output of specific values. It is used in general qualitative testing or self-testing instruments. Semiconductor alcohol sensors (Winsen MQ303B) are usually used, which can detect various concentrations of alcohol atmospheres and has high sensitivity to alcohol, can resist the interference of gasoline, smoke, water vapor, long life, low cost, simple driving circuit, widely used in automotive alcohol gas alarms, and portable alcohol detectors.
In order to effectively stop the drunk driving, the European Union recently introduced a new regulation. From May 2022, all new vehicles will be required to have a connection port for the installation of an alcohol tester. Once the driver is detected by an in-vehicle alcohol tester with an excessive alcohol content, the vehicle engine will not start. The installation deadline for older cars is until 2024.
There are also many buses loaded with alcohol locks. The driver needs to enter the fingerprint into the system in advance, and the vehicle can be started only after the alcohol test shows that it is normal before departure.The device judges the alcohol content by the driver's breath.When the alcohol content exceeds the standard, the system will disable the function of the car start button, and the driver cannot start the car normally, control the occurrence of drunk driving from the source.
Sensitive material of MQ-3B gas sensor is SnO2, which with lower conductivity in clean air. When the target alcohol gas exist, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. MQ-3B gas sensor has high sensitivity to alcohol gas and can resistant to the interference of gasoline, smoke and vapour. It is with low cost and suitable for various applications of detecting alcohol at different concentration.
ME2-C2H5OH-13×13 is a fuel cell type alcohol chemical sensor. Alcohol and oxygen have a corresponding redox reaction on the working electrode and the counter electrode and release charges to form a current. The magnitude of the generated current is proportional to the alcohol concentration and follows Faraday's law. The level of alcohol concentration can be determined by testing the magnitude of the current.
ME2-C2H5OH-Ф16 electrochemical sensor detect gas concentration by measuring current based on the electrochemical principle, which utilizes the electrochemical oxidation process of target gas on the working electrode inside the electrolytic cell, the current produced in electrochemical reaction of the target gas are in direct proportion with its concentration while following Faraday law, then concentration of the gas could be get by measuring value of current.
MEMS alcohol gas sensor is using MEMS micro-fabrication hot plate on a Si substrate base, gas-sensitive materials used in the clean air with low conductivity metal oxide semiconductor material. When the sensor exposed to gas atmosphere, the conductivity is changing as the detected gas concentration in the air. The higher the concentration of the gas, the higher the conductivity. Use simple circuit can convert the change of conductivity of the gas concentration corresponding to the output signal.
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