David Sze Wai Choong

Agency for Science, Technology and Research

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About

David Sze Wai Choong is pioneering advances in ultrasonic sensing through his innovative work with piezoelectric micromachined ultrasonic transducers (pMUTs). His research centers on high-resolution, high-frequency ultrasonic ranging in air, with a particular focus on enabling precise distance measurements for applications in robotics, industrial machinery, and vibration detection. Choong’s major contribution lies in demonstrating that operating pMUTs below their resonance frequency can achieve wide bandwidths, dramatically improving range resolution. His most-cited work, “High Resolution, High Frequency Ultrasonic Ranging in Air with pMUTs” (2021), has garnered 23 citations and established a foundational technique for next-generation sensing. Building on this, his 2024 paper introduces a novel method for close-range, high-resolution detection of vibration using silicon-on-nothing PMUTs, employing cross-correlation techniques to accurately extract time-of-flight data. This work, with 6 citations, pushes the boundaries of ultrasonic sensing in constrained environments. Choong’s contributions are shaping the future of compact, high-precision ultrasonic systems, offering transformative potential for autonomous navigation, industrial automation, and non-destructive testing.