How Fingerprint Reader Works?

If you are looking for a robust security system in your home, a biometric scanner is the best choice. A biometric scanner takes into account the unique characteristics of a person’s biological appearance for identification.

Every individual is born with unique biological features, making a biometric scanner a secure means of identity verification.

Security devices use numerous biometric criteria for verification. For instance, when you deploy an eye scanner for security, it utilises the unique patterns of the iris, providing a highly secure and reliable method of biometric authentication.

However, among all the biometric scanners, a fingerprint scanner is one of the most convenient and efficient methods of identity verification. If you are wondering how a fingerprint scanner works, read the article below:

The Mechanism Behind a Fingerprint Scanner

A fingerprint scanning processor has three technologies: Optical, capacitive and ultrasonic. An optical processor is the oldest technology that utilises light to capture fingerprint images, whereas a capacitative processor relies on electric current to capture a fingerprint template.

On the other hand, an ultrasonic processor is the most advanced and uses ultrasonic waves to capture 3D images of fingerprints.

Even though all three processors use different technologies to capture fingerprints, the basic mechanism is the same. A fingerprint reader works in the following way:

  1. Initial onboarding:

In the initial onboarding phase, the user must interact with the scanner to provide information about their fingerprint. In this process, the scanner will capture the ridges and valleys of the fingerprint through sensors. The captured data is then processed and converted into a unique digital representation for future biometric authentication. Biometrics is a great mechanism to provide security to a place or device. Moreover, since every human fingerprint is unique, deploying a fingerprint scanner can provide a robust layer of security.

  1. Scanning and Authentication:

Now, whenever the user wants access through the security device, it has to place its fingerprint on the scanner. Once scanned, the fingerprint is converted into a biometric schema and compared to existing digital fingerprints. If the fingerprint matches, the user is granted access. It is crucial to note that the authentication speed and accuracy will depend on the scanner’s processor and other external factors such as moisture and scratches.


A fingerprint scanner is a reliable security device. Because every human fingerprint is unique, it is very rare that the scanner will give a false result. However, to ensure 100% accuracy, one must buy only a quality scanner with a strong processor.

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