Change Detection in an Electronic Device Using Resonant Frequency Analysis

Abstract

Detecting internal physical changes in an electronic device (e.g., a smartphone, smart watch, wearable device) may be difficult with some conventional methods, and is often limited to chemical or electrical monitoring that fails to detect structural changes. A system can perform a mechanical resonant frequency analysis using existing hardware components, such as a haptic actuator and one or more sensors (e.g., an accelerometer, a microphone). The haptic actuator can be configured to generate a vibrational stimulus across a range of frequencies, while the sensors can measure the device\u27s corresponding response. This measured response data can be processed to generate a frequency response profile, which can then be compared against a stored baseline profile representing a nominal structural state. Deviations between the current and baseline profiles, such as shifts in resonant frequencies or changes in damping, may provide a non-invasive technique for early detection of structural changes within the device. These changes can include battery swelling, adhesive failure, component loosening, or liquid ingress