Ultrasonic Fingerprint Detection With Temperature-Based Echo Stacking
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Solution Overview
Problem
Ultrasonic signals experience significant loss and noise fluctuations in conductive mediums, affecting the stability and accuracy of fingerprint detection in varying usage scenarios, particularly due to temperature and film application state variations.
Innovation Solution
The method involves determining the number of ultrasonic emission times based on current temperature and/or film application state, emitting ultrasonic signals multiple times, and superimposing echo signals to enhance the accumulated sum signal for fingerprint detection, ensuring the intensity remains within a certain range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic signals are emitted through conductive mediums for fingerprint detection, then fingerprint detection can be performed, but the ultrasonic signals experience significant loss and noise fluctuations affecting detection stability
Solution Approach 1:
The patent applies periodic action by emitting ultrasonic signals multiple times (n times) rather than a single emission. The system performs repeated ultrasonic emissions and accumulates the echo signals, which stabilizes the detection results against signal loss and noise fluctuations in the conductive medium.
Solution Approach 2:
The patent merges multiple echo signals through accumulation/superposition. By combining n echo signals from multiple ultrasonic emissions, the system enhances the accumulated sum signal intensity while reducing the relative impact of noise, thereby improving detection reliability despite signal loss in the conductive medium.
2Measurement precision
If the number of ultrasonic emission times is increased to reduce noise influence, then detection accuracy improves, but the detection time and energy consumption increase
Solution Approach 1:
The patent dynamically adjusts the emission time parameter (n) based on temperature and film application state. By changing this parameter adaptively rather than using a fixed value, the system achieves optimal detection accuracy for different conditions while minimizing unnecessary detection time and energy consumption.
Solution Approach 2:
The system incorporates feedback mechanisms by determining the number of emission times based on current temperature and film application state. This feedback loop allows the system to optimize the balance between detection accuracy and time/energy consumption according to actual operating conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces noise influence and maintains fingerprint detection accuracy by enhancing the intensity of the accumulated sum signal, improving stability across different temperature and film application scenarios.
Implementation Method 1
ultrasonic signals are emitted by the ultrasonic sensors to the conductive mediums, and echo signals of the ultrasonic signals are received
Implementation Method 2
Ultrasonic detection is a non-destructive detection technology that utilizes the interaction between ultrasonic waves and substances
Data Source
AI summary
A method and apparatus for detecting a fingerprint with ultrasonic waves, an electronic device and a storage medium are provided. The method includes: acquiring a current temperature and/or a current film application state of a conductive medium, where a first side surface of the conductive medium is attached to an ultrasonic sensor, and a second side surface of the conductive medium provides a pressing surface; determining a number of ultrasonic emission times n based on the current temperature and/or the current film application state, where n is a positive integer; controlling the ultrasonic sensor to emit ultrasonic signals n times to the conductive medium, and receiving an echo signal formed after each emitted ultrasonic signal is reflected; and performing fingerprint detection based on the echo signal.