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Nomura Lab
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The lab studies acoustic phenomena and related technologies, from audible sound to ultrasound.
AboutAbout the lab
Exploring acoustics and electronics, all the way to ultrasound
The Acoustic Electronics Lab studies acoustic electronics, a fusion of acoustic engineering and electronics.
A distinctive feature of the lab is that it deals not only with sound that people can hear, but also with inaudible ultrasound and nonlinear acoustic phenomena.
Recently, it has been studying measurement and imaging techniques that use nonlinear ultrasound phenomena, techniques for improving sound environments, and the safety of ultrasound use.
The lab approaches these topics through theory, computer simulation, experiments, and the design and prototyping of devices.
Key terms
- Nonlinear acoustics
- A field of acoustics that deals with nonlinear phenomena such as waveform distortion of sound waves, acoustic streaming, and acoustic radiation pressure
- Parametric speaker
- A highly directional acoustic system that uses ultrasound to deliver sound to a specific place
- Vibro-acoustography
- An imaging technique that vibrates an object with ultrasound and creates an image based on the acoustic emission from it
NewsLab news
Professor Nomura received the IOP Outstanding Reviewer Awards 2025 from the Japanese Journal of Applied Physics
An undergraduate student received the Best Presentation Award at the undergraduate thesis presentation
Professor Nomura's review article on the history and future prospects of nonlinear acoustics was published in the journal Keisoku Seigyo
A paper by students and Professor Nomura was published in Jpn. J. Appl. Phys.
ResearchResearch themes
The lab broadly investigates phenomena related to sound waves and acoustics, from frequencies audible to the ear to ultrasonic frequencies inaudible to the ear, aiming to improve quality of life (QOL). It treats nonlinear acoustics as a particularly important research topic, and works on applications such as parametric speakers as well as imaging and measurement using ultrasound.
*Illustrative imageVibro-acoustography
The lab is developing a technique that vibrates an object with ultrasound and turns the acoustic emission from it into an image. A feature of this technique is that it can visualize mechanical characteristics such as stiffness and viscosity.
*Illustrative imageLow-frequency ultrasound imaging
High-frequency ultrasound, such as that used in medical ultrasound diagnosis, is strongly absorbed and therefore has limited penetration depth. To obtain images of a wide area using low-frequency ultrasound, which is absorbed less, the lab is trying to apply a parametric low-frequency sound source and pulse compression techniques.
*Illustrative imageMeasurement of ultrasonic output using radiation force
The lab investigates methods for obtaining the distribution of radiation pressure and sound pressure from changes in the shape of a water surface caused by acoustic radiation pressure, and is considering their use for measuring the acoustic output power of ultrasonic transducers. Because the water surface is the target, there is no risk of damage, and the lab also studies the acoustic streaming that occurs at the same time.
*Illustrative imageApplied technologies for highly directional speakers
Sound waves spread as they travel, so it is difficult to deliver music or announcements to a specific place. The lab develops parametric speakers, which are highly directional acoustic systems that use ultrasound, and studies the sound images created by their sound fields.
MembersFaculty
The members of the Acoustic Electronics Lab are faculty, graduate students, students from the short-term exchange program (JUSST), undergraduate thesis students, and collaborative researchers.As of 2025
- ProfessorHideyuki Nomura
- Assistant ProfessorZhu Peixian
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “40kHz ultrasonic transducer” DMGualtieri / CC BY-SA 4.0 (cropped)
- Vibro-acoustography: “Ultrasound (Sonography) Imaging Services in Navi Mumbai” Goleisureintl / CC BY 4.0 (cropped)
- Low-frequency ultrasound imaging: “DL50 - glass ultrasonic delay line - ultrasonic transducer” Mister rf / CC BY-SA 4.0 (cropped)
- Measurement of ultrasonic output using radiation force: “EFR-0SB40K23” Mister rf / CC BY-SA 4.0 (cropped)
- Applied technologies for highly directional speakers: “HOT Watch Directional speaker and microphone module” Orangeboxes2 / CC0 (cropped)
- Related lab (Koike Lab): “1406 Cochlea ku” https://openstax.org. / CC BY 4.0 (cropped)
- Related lab (Ishikawa Lab): “Monolithic microwave integrated circuit MSA0686 fixed” Appaloosa / CC BY-SA 3.0 (cropped)
- Related lab (Kanamori Lab): “Мехатроник” Albogex / CC BY-SA 4.0 (cropped)
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