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To: David who wrote (327)	1/31/1999 12:11:00 PM
From: kbert	Read Replies (1) \| Respond to of 384

Temperature reading for sure wont work. You just need to keep your dead finger in warm water! What a joke I am not a criminal but I can find this one in 1/10 second thinking Electric charge, I have doubt and it for sure increase cost Same with pulse detection. :) Archie

To: David who wrote (327)	1/31/1999 1:57:00 PM
From: Rob S.	Respond to of 384

There are a few cheap ways to determine a live form a dead finger. A couple of these can be designed with little or no additional hardware compared to the stuff needed to do the finger scan: 1] you look for the blood pulse - a UV photodiode can "see" through skin well enough to pick up a pulse. Some relatively low cost medical devices have used this technique for several years to measure blood flow characteristics with a much higher degree of accuracy than is needed here. 2] Electromagnetic - using an HMR chip that costs just a few bucks each (made by Honeywell SSEC and others) you can tell the presence of a live finger. There are probably other techniques to do the same thing that I am not aware of.