The human race will become extinct if there is no water for drinking. A lot of countries are facing water scarcity already due to the growing population in many countries. Things are going to only get worse in the years to come ahead. On top of all this mayhem, many are scared about the purity of the water they drink every day at home and outside. Some paranoids even don’t trust bottled mineral waters. We cannot blame their fears anyway as we tend to hear a lot of stories every day about contaminated food served or bacteria-infected drinks sold to many. These incidents are alarming but true.
A lot of purity checking kits available in the market can be acquired to do they need, which can be used to do a check. We have DIY water-testing kits to check out the U.S. Environmental Protection Agency’s database. Hence, there are numerous ways to go about testing if the water available is safe to drink before you decide to drink.
Scientists from the University of Missouri and Mexico’s Universidad de Guanajuato have come up with an alternative solution — and it’s a high tech doozy! Their methodology is to use a tattoo removal laser machine to flash out a series of brief bursts of light, each lasting around 10 nanoseconds. These flashes of light travel through a fiber optic cable, which is wrapped on one end with paint-on liquid electrical tape. The cable’s end is submerged in the liquid to be tested, converting the laser light into sound. The sound is recorded by a microphone, and the data analyzed in real-time.
In short, it uses sonar technology to measure the purity of liquid. It does this by measuring the length of time which passes between each laser flash and the sound reaching the microphone. This allows the researchers to work out how quickly sound waves are traveling in the water — which lets them establish whether there is something in the water that is causing the sound waves to not move as fast as they should.
“This phenomenon is known as the photoacoustic effect,”. Gerardo Gutiérrez Juárez at the
A paper describing the work, titled “Laser-induced sound pinging: A rapid photoacoustic method to determine the speed of sound in microliter fluid volumes,” was recently published in the journal Sensors and Actuators, B: Chemical.
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