Here are some fingerprint scanners you should know about...
- Optical Scanner
Optical scanners use an LED light to illuminate the finger. The sensor detects and creates the fingerprint image by determining the light and dark areas created by the fingerprint ridges.
- Ultrasonic Scanner
These scanners work via sound waves. The hardware is designed to send out ultrasonic pulses and measure how much bounces back. Ridges and valleys reflect sound differently, this is how a map of fingerprint patterns.
- Capacitive Scanner
Instead of light, capacitive scanners use electricity to determine fingerprint patterns. Most of the phones with fingerprint scanners use capacitive sensors.
- Thermal Scanners
Thermal scanners sense the temperature differences on the contact surface, in between fingerprint ridges and valleys.
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