October 01, 2023
In an access control system, fingerprint authentication is mainly used in places with a high level of security or with relatively fixed personnel. However, in real conditions, sometimes recognition rate is low or false recognition occurs. Therefore, it is necessary to present advantages and disadvantages of various technologies and precautions for using fingerprints.
Currently, there are two commonly used fingerprint modules: capacitive fingerprint module and optical fingerprint module.
Capacitive fingerprint module. Capacitive fingerprint lock refers to a capacitive sensor that uses automatic adjustment control technology to adjust fingerprint image pixels and sensitivity of local area of the fingerprint, and combines feedback information to create a high-precision quality image under different conditions. Thanks to local adjustment capability, even light finger pressure areas can be detected, and sensitivity of these pixels at moment of capture is increased, resulting in a high-quality fingerprint image. The advantages of capacitive fingerprints are better image quality, generally no distortion, smaller size, and easy integration into various devices. Among them, electronic signal will pass through surface and dead skin layer of finger to reach living layer (dermis) of finger skin and directly read fingerprint pattern, thus greatly improving security of system. No need to worry too much about dead skin phenomenon, capacitive fingerprint sensor can recognize your fingerprint very well.
Optical fingerprint module. The optical fingerprint identification module adapts well to environmental conditions. The data acquisition window of fingerprint optical head is usually made of tempered glass, which can resist pressure, abrasion, acid, alkali and stains to a certain extent. It is well adapted to temperature of working environment. It can support operation of components in environment from -15 degrees Celsius to 55 degrees Celsius and 20%-95% humidity. The glass surface is easy to clean. It can be used in normal environments such as at home, as well as special environments such as humidity, high temperature and dust. However, severe optical distortion usually occurs due to limitation of optical path, and traces are often left on surface of capture window. However, optical fingerprint recognition technology has passed long-term market testing and is constantly being improved. In addition, optical fingerprint head has better adaptability to environment, better stability during use, and a longer service life than capacitive fingerprint head. . module. The cost of optical fingerprint modules is low, and there is a relatively mature industrial scale that can ensure mass production of modules, and raw materials used in optical fingerprint modules are relatively cheap, so cost of optical fingerprint modules is generally cheaper than capacitive ones. fingerprints.
Summarizing, both capacitive and optical fingerprint locks have their advantages. Users can choose fingerprint lock that suits them according to above introduction and their own needs and preferences. But according to current market and development, semiconductor fingerprint recognition will become trend of future development!