This can potentially make ultrasonic biometric fingerprint scanners more secure overall than other readers (when they work properly). Additionally, capacitive and optical fingerprint scanners are only capable of producing 2D images, while ultrasonic scanners can produce highly accurate 3D images. Ultrasonic sensors can even function through thin surfaces like aluminum, glass, or plastic (like in a smartphone’s screen). Unlike capacitive scanners, the quality of output by ultrasonic sensors is theoretically not affected by finger surfaces contaminated by dirt, lotion, sweat, blood, etc. Ultrasonic scanners are not very common in consumer devices yet (although some top-tier Samsung phones use them), and prices are still quite high. Once the sound waves have been measured, the fingerprint image is created and digitally compared against a stored reference copy. This distance is measured using a transducer that sends and receives ultrasonic sound pulses, which bounce off the surfaces of the fingerprint and are collected by the receiver, which then provides details on the accuracy of the fingerprint. Instead of using capacitive surfaces or light, ultrasonic sensors measure the distance to the ridges and valleys of your fingerprint using ultrasonic sound waves. How do ultrasonic fingerprint scanners work, and are they superior to other types? Not ideal for a potentially high-stress, high-speed situation like unlocking a gun safe. An internal algorithm tests whether the image is too light or too dark, and if it doesn’t pass this test, typically an audible beep or LED indicator alerts the operator that the scan didn’t work, and you need to start over again. On the other hand, if the image is too dark, the relevant details will not be apparent. If the image is too bright, important details of your fingerprint may be “washed out” completely-similar to an indoor digital photo where the flash is too close or too bright (we’ve all been there). The longer the image-capture process takes, the brighter the image formed on the image sensor. Since the technology works as reflected light bounces back from your finger, through the glass, onto an image sensor, the time it takes can vary. For example, the quality of the image can vary according to how hard you’re pressing your finger against the surface, how clean or greasy your fingers are, how clean the scanning surface is, the light level in the room, the shade of your skin color, and more. However, optical readers are more easily fooled by fingerprint molds or even photocopied images, they aren’t as reliable as other types, and they can be a bit clunky in use. However, if your fingers are greasy, bloody, muddy, etc., you may have difficulty getting an accurate scan quickly. All of this happens in a second or less.Ĭompared to optical and ultrasonic systems available today, capacitive fingerprint scanners are generally more reliable and much faster. If it matches, the security “pass” is sent and an electrical tumbler or mechanism opens the security device. That information is compared to a digital file stored in the device. These nearly microscopic variations are tracked by an operational amplifier/integrator circuit, which produces information that is then collected by an analog-to-digital converter and evaluated. Where a ridge of your fingerprint contacts a capacitor, it modifies the charge stored in the capacitor, while the valleys, or the air/space between the ridges of your fingerprint, don’t contact the capacitor, and thus, their charge remains intact. Similarly, dying batteries can cause issues, so swap old ones out with new ones-and stick with the recommendations made by the manufacturer.With capacitive technology can read the difference in electrical resistance between the “peaks and valleys” of your fingerprints. That way, if your index finger or other preferred fingertip doesn’t work, you have nine backups ready to go. ![]() One easy way to get around this is by scanning all 10 of your fingers-and if your safe has room for more IDs, scan them in multiple positions. Cuts, sweaty fingers, and dirt can cause fingerprint reader issues. If you choose a biometric safe, be sure to clean the fingerprint reader often with a Q-tip. ![]() Some problems, like a dirty scanner, are easy to fix. After all, technology isn’t perfect 100% of the time. All the safes we chose here tested well for reliability, but in some cases, you may still run into issues. When looking at biometric or RFID safes, try to get a feel for how reliable the fingerprint scanner or RFID reader is, either by testing it in person or reading what reviewers have to say. You’re locking your valuables away for safety, but when you need them, you don’t want to deal with a finicky fingerprint scanner.
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