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| There are new tools for checking drunk driving |
| "Earmuff" sensor can detect blood alcohol content in real time |
Science and Technology Daily (Reporter Zhang Mengran) uses a special "earmuff" sensor to accurately measure blood alcohol content through the skin
.
According to an engineering principle verification study published on June 10 in the journal "Science Reports" under Natural Science Research, a newly developed new device worn on the ears can non-invasively detect the blood alcohol content of the wearer's skin.
Alcohol detectors are now well-known, and there are usually two detection methods: one is to detect the blood alcohol concentration of the human body, and the other is to detect the breath alcohol concentration
.
Theoretically speaking, to accurately determine whether or not the alcohol intake is exceeded, the most accurate method should be to check the alcohol content of the subject's blood
The device designed by Koji Sanbayashi, a researcher at Tokyo Medical and Dental University and his colleagues, includes a modified commercial earmuff and an ethanol gas sensor.
The “earmuff” is responsible for collecting the gas released from the wearer’s ear skin.
The sensor will emit light when it detects ethanol gas, and the light intensity can be used to calculate the ethanol concentration
.
The research team first allowed three male volunteers to drink at a dose of 0.
4 g/kg of alcohol, and then used their device to continuously monitor the ethanol gas released from the ears of the three volunteers for 140 minutes
.
The team also used another ethanol gas sensor and a device to detect the concentration of ethanol in the volunteers' breath at regular intervals.
The researchers found that the concentration of ethanol released from the ears and exhalation of all volunteers changed very similarly over time
.
Previous analysis has shown that there is a correlation between breath and the concentration of alcohol in the blood, so this also indicates that the device may replace the alcohol detector in the future to estimate the blood alcohol content
In the past, when the breath test was used, the subject was required to breathe in deeply with a blowpipe and then exhale with a moderate force for more than 3 seconds.
The alcohol content in the breath and the alcohol content in the blood have a corresponding relationship that can be expressed
.
Previously, there was also a device to detect blood alcohol content through the hand as a non-invasive alternative to breath detection, but now it is believed that the average maximum ethanol concentration released by the ear is twice the concentration released by the skin of the hand, and it does not need to be like a breath test.
