Hi, this is Wayne again with a topic “How Does Fingerprint Scanning Work?”.
Thanks for watching tech, quickie click, the subscribe button then enable notifications with the Bell icon. So you won’t miss any future videos, so it wasn’t that long ago that any mention of fingerprint scanning with conjure up images of James Bond, breaking it to a supervillains evil lair. These days, it seems like everyone from secret agents to travel agents, is carrying around fingerprint scanners built into the smartphones that are paying 30 bucks a month for, but how exactly do they work and how are they found their way onto so many consumer devices? Well, as it turns out typical fingerprint readers use the same principle of capacitance as track pads and touchscreens. So if you check out our other episode on touch screens, you’ll know that they typically function by detecting the difference in charge between the lower layer of your skin, which is conductive and the phone screen itself.
Fingerprint readers adapt this concept for personal identification by cramming loss of tiny conductive plates into the space just below the scanner surface, they’re narrower than the ridges that make up your fingerprints. When you place your finger tip against the reader, the sensors can tell which portions of your finger, the ridges, are touching the sensor and which are not because the small valleys are further away from the sensor, which decreases the capacitance. The tiny place will pick up the reader can use these differences in capacitance to form a virtual image of the ridges of your fingerprint.
Now these scanners have actually been on phones since 2007, but only you really took off when Apple released touch ID with the iPhone 5s in 2013. However, there are other types of fingerprint readers, too. Optical scanners use visible light to capture a more traditional image of your fingertips, but these are uncommon at least imported of Isis due to their bulk and ultrasonic fingerprint readers have the potential to be the next big thing. These works somewhat, similarly to a bats, echolocation.
The way they work out, the shapes of objects in the dark ultrasonic pulses, emanate from the reader and hit the ridges of your fingerprints. Then variations in the return signal are used to construct a scan. Ultrasonic, sensors not only have the advantage of a cool marketing friendly name, but they can also work through other materials, allowing them to be seamlessly embedded underneath the phone surface for a slicker look, or it appeared through the crud of moisture on your hands for better reliability Than there are capacitive counterparts sounds great right, but while many people originally the fingerprint sensors, is a highly secure technology, perhaps because of their association with spy films. They certainly aren’t foolproof, no matter exactly which variety you’re using think of how the scanner on your phone will work, even though you don’t place your finger on it in exactly the same position every time. This is because they only require a good-enough partial match to decided this your finger now, this allows it to recognize you from many different angles, but it also means there’s a small chance of a false, positive and, even though master fingerprints are typically secured in some way. Like how Apple encrypts the touch ID fingerprint and stores it locally, it’s still possible to defeat fingerprint readers using artificial moles that can be created. If say, some miscreant gets to hold a fingerprints that you left on a wineglass. So while the technology is super convenient, there are holes that have led most smartphone operating systems to also require a password or PIN, which is especially important if you’re, one of the few dozen or so people in the world that were born without fingerprints mmm. Well. Speaking of fingerprints, are you trying to leave a unique impression on the world as a freelancer, but you’re always racing against the clock it’s challenging, but with the growth of the Internet, there’s never been more opportunities for the self-employed to meet.
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