In general, the NFC CARD technology is the least of your concerns when it comes to implementing access control at a school. At the top of the list of expenses would be the purchase and installation of perimeter control. Without proper fencing, no access control system would be worth anything. Similarly, turnstiles (devices used to allow one person through a gate at a time) can be quite costly and one would normally need a number of these to allow acceptable entrance rates into/out of the school premises.
A general rule of thumb for combo cards biometric devices would be to allow for a maximum of 8 learners per minute through a turnstile. This means that if you need to grant access for 500 children onto the school terrain between 07:10 and 07:30 am, an average of 25 children would arrive at any minute during that time. We know that this is not the case though. Of the 500, 350 would probably arrive within the last 10 minutes before the school starts. To allow 350 kids access through contactless cards controlled turnstiles within 10 minutes, would require 3-4 turnstiles to be installed.
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Biometrics (ancient Greek: bios life, metron measure) introduces the technology and methods for uniquely recognizing a person by storing unique biological metrics of that person in a central database from which identification of said metrics can be done without the need for access cards, security tags, etc.
What is the preferred way of implementing RFID CARD at schools?
From an affordability, accuracy, and usability perspective, the primary options for biometric access control at schools would be fingerprint, palm vein, and face metrics.
Fingerprint biometrics is by far the most popular, but do suffer from a few practical limitations. Young children, up to the age of 8 years, have notoriously unreadable fingerprints.In March 2009, the European Parliament has consented that children under the age of 12 would not be required to have their fingerprints recorded as part of their visa applications.
This would thus exclude fingerprint rfid inlay from use in primary schools.
Another challenge with most fingerprint biometrics, is the vulnerability towards ambient temperature. Although a device may have operating specifications that is way below zero degrees Celsius, any person subjected to an outside temperature close to that temperature, even for short periods of time, will undergo combo cards changes where blood vessels contract to retain heat, and in doing so, altering the ratios and distances of various minutiae points on his/her fingers.