Enabling low voltage electronics for ultrasonic structural health monitoring
- The ability to detect, assess, and predict damage is key to ensuring the safety and long-term maintainability of critical aerospace, civil and mechanical structures. Traditional maintenance methods are increasingly limited in their effectiveness due to their use of bulky equipment, reliance on a schedule and incompatibility with new materials such as composites. Ultrasonic structural health monitoring (SHM) addresses these challenges by employing networks of piezoelectric sensors that are embedded within the structure under test. Ideally, the accompanying actuation and data acquisition electronics have a compact form factor that enables localized data collection and consolidation before communicating with the centralized processing unit. However, despite advances in the sensors, the electronics have remained relatively bulky thereby greatly limiting the deployment of real-time SHM. A key limiter to miniaturization is the use of high actuation voltages (50 Vpp to 200 Vpp) to ensure that the received signals have sufficient SNR to localize defects accurately and reliably. With aerospace applications as our target, we explore pathways to enable the design and implementation of integrated interface electronics to actuate and receive the ultrasonic guided waves used for SHM. First, we present a frequency-domain S-parameter approach to SHM that allows us to trade off longer measurement times with lower actuation voltages to achieve high SNR transfer function measurements of the structures under test. Using this method, we successfully perform end-to-end SHM at actuation voltages as low as 1.26 Vpp, an improvement of up to 160 times. We then present a method to simplify and speed up the measurements using broadband actuation signals. Next, we develop a framework for determining the SNR requirements of a widely used SHM detection and localization algorithm. Finally, we specify CMOS-compatible hardware requirements derived from these earlier insights along with experimental results obtained from a printed circuit board (PCB) prototype.
|Type of resource
|electronic resource; remote; computer; online resource
|1 online resource.
|Degree committee member
|Degree committee member
|Stanford University, School of Engineering
|Stanford University, Department of Electrical Engineering
|Statement of responsibility
|Submitted to the Department of Electrical Engineering.
|Thesis Ph.D. Stanford University 2023.
- © 2023 by Gift Nyikayaramba
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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