Fingerprint Door Lock
Home /

Fingerprint Door Lock

Is there a bug? Why does the fingerprint sensor fail when exposed to water

February 27 , 2021

Fingerprints glass door locks, due to their lifelong immutability, uniqueness, and convenience, have almost become synonymous with biometric identification. Fingerprints refer to the uneven lines on the skin on the front of a human finger. The lines are arranged regularly to form different patterns. The starting point, ending point, joining point, and bifurcation point of the ridge is called the minutiae feature points of the fingerprint.


  The points formed by the interruption, bifurcation, or turning of the fingerprint reader are the minutiae feature points, and these minutiae feature points provide the confirmation information of the uniqueness of the fingerprint. The fingerprint recognition sensor records the direction of the fingerprint pattern and digitizes it to form a unique key to unlock your mobile phone.


From the principle point of view, frameless glass door locks, fingerprint recognition does not seem to be advanced, and with the advancement of technology, the sensitivity of fingerprint recognition of mobile phones has become higher and higher, but when people are immersed in the safe and convenient experience of fingerprint recognition Many people have discovered a flaw in fingerprint recognition, that is, after being dipped in water, many of the fingerprint sensors of mobile phones that are very sensitive in normal use become less sensitive, so why? Today we will analyze the reasons for you.


Speaking of the reasons, we must first determine the method of mobile phone fingerprints. At present, there are mainly three types of fingerprint collection: in vivo optical, capacitive, and pressure-sensitive, and the higher utilization rate in mobile phones is mainly capacitive. When it comes to capacitance, everyone should be able to think of capacitive screens. They have the same principle, and they all use the current induction of the human body to work.


The periphery of the fingerprint recognition sensor is plated with long and narrow electrodes. When the user's finger touches, due to the human body's electric field, the user's fingerprint lines and the sensor surface will form a coupling capacitor. For high-frequency current, the capacitor is a direct conductor, so the finger will A small current is drawn from the contact point. This current flows out from the peripheral electrodes, and the current flowing through the peripheral electrodes is proportional to the distance from the fingerprint to the periphery. The controller calculates the current ratio accurately to obtain the touch pattern. It should be roughly like this, involving detailed details. The calculation editor is not very familiar.


   To put it simply, where the user's fingerprint is, wherever there is "leakage", the sensor will respond. When the sensor is wetted with water or the hands are sweaty, because of the conductive properties of water, when the water touches the sensor and touches the sensor again, the current will be affected, so the above calculation is inaccurate.


For the method, I believe that many friends have their own solutions. Wiping the fingerprint recognition sensor with paper and drying the hands should be a better way. Of course, because the fingerprint recognition sensor may also keep the humidity around, sometimes even after we wipe it, Inaccurate recognition will still occur, so the best solution is to temporarily unlock with a password or pattern, and then perform recognition after the sensor is completely dry.


Author: Written by Ms ZhangZiJuan from S4A INDUSTRIAL CO.,LIMITED

Contact Us
  S4A-Security For All.S4A Industrial Co., Limited, Founded in 2010, We have been dedicating in access control production R&D and sales for 10year till now. With the belief that we do one thing well in a lifetime, our CEO has been in this industry for 15 years. During the past 10 years, our products have been exported to various countries and regions. And 90% of customers come from the recommendations of cooperative customers, and 80% of the turnover comes from cooperative customers in the past 10years.Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. We attach great importance to the partner's appeal, customer's suggestions, and feedbacks. To strengthen Product quality awareness, client's service awareness. Our clients and S4A are on the same path walking for many years.       S4A's future would be even more brilliant, this is related to all of our staff's working sweat. When you join this team, you will feel an invisible power to drive walk forward. S4A mainly produces a series of security Door Access Control such as:Network Access Controller, Locker board, Electromagnetic lock, Standalone door Controller, Automatic door opener, etcOur team can manufacture products, sell products, and do after-sales.In the realm of access control, one company stands out for its unwavering commitment to providing security services for everyone. S4A, which stands for "Security for All," has been at the forefront of access control technology for the past 13 years. With its own state-of-the-art factory and a strong focus on research and development, S4A has continuously delivered cutting-edge access control machines with the latest functions. Their dedication to product quality, customer feedback, practicability, and cost performance sets them apart as a leader in the industry.Factory and R&D Expertise:S4A takes pride in its fully-equipped factory, where skilled engineers and technicians work tirelessly to develop and manufacture access control solutions that meet the highest standards. The company's investment in research and development has resulted in a steady stream of innovative products that cater to evolving security needs.By staying ahead of the curve, S4A ensures that their customers have access to the latest advancements in access control technology.Quality Assurance and Customer Feedback:At S4A, product quality is of paramount importance. The company adheres to rigorous quality control procedures throughout the manufacturing process to guarantee the reliability and durability of their access control machines. Each product undergoes comprehensive testing to ensure it meets industry standards and exceeds customer expectations. S4A also places great value on customer feedback, actively seeking input to continuously improve their products and services. By listening to their customers, S4A maintains a customer-centric approach and delivers solutions that address real-world security challenges.Practicability and Cost Performance:S4A understands that access control solutions must not only be technologically advanced but also practical and cost-effective. The company's emphasis on practicability means that their products are designed to be user-friendly, easily integrated into existing systems, and adaptable to various environments. S4A's access control machines are known for their intuitive interfaces, simple installation processes, and seamless compatibility with other security systems. Additionally, S4A strives to provide cost-effective solutions without compromising on quality. Their competitive pricing ensures that security is accessible to businesses and individuals of all sizes.With 13 years of industry experience, S4A has cemented its position as a leading provider of access control solutions. Through their dedication to "Security for All," the company has set a benchmark for excellence in product quality, customer satisfaction,practicability, and cost performance. S4A's in-house factory and research and development capabilities enable them to stay at the forefront of technological advancements in the field of access control. As the company continues to evolve and innovate, S4A remains committed to empowering individuals and organizations with the highest level of security, ensuring that everyone can enjoy the peace of mind that comes with a reliable and efficient access control system.We can create value for you!Quality takes great importance for a company's credibility, and buyer's every penny spend must worth it. That is our most basic principle. Our business mainly for wholesale, so we could offer large quantities at competitive prices. During the past 10 years, We work hard to create value for our customers, and with our help, customers have an increasing market share. 99% of the customer...<
  • Address

    Factory Address:Building S4A, South Third Lane, Qiuyuling Street, Zhangkeng Village, Hengli Town, Dongguan City, Guangdong Province Office Address:#601,floor 6 ,building 1,JINFANGHUA industrial zone, Bantian St. Longgang Dist. Shenzhen, PRC.

  • Call us

    0086 755 29450011

Leave A Message

If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

Leave A Message
Leave A Message
If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

Home

Products

about

contact