Re: Finger Print Sensing
See this :
Cop’s homemade fingerprint scanner
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Ultrasonic scanners have the ability to scan beneath the skin. This gives the scanner the ability to verify that there is a live person present. These provide a high level of security, but are slower than others.
Capacitive scanners are more resistant to contamination by dirt and debris than other scanners. They are also more susceptible to interference by static electricity
Optical scanners often include an LED light that is used to illuminate the fingerprint. The sensors use this light to scan the fingerprint. Its dependency on light, though, makes it susceptible to interference from ambient light.