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Acoustic Systems Lab (Wakatsuki)
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A lab that studies how sound and ultrasound propagate and applies the findings.
AboutAbout the lab
Broad research on sound and ultrasound
The Acoustic Systems Lab pursues peace of mind, safety, comfort, and richness of life by drawing on the relationships between sound and light and nature, people, art, food, and man-made objects.
The lab mainly studies vibration phenomena, including acoustics. It investigates the properties of sound waves traveling through gases, liquids, and solids, as well as the mechanisms by which musical instruments produce sound.
Computers are used in the research, but the lab also builds its experimental equipment by hand wherever possible, and works without drawing a line between hardware and software.
Key terms
- Ultrasound
- Sound waves with frequencies above the range audible to the human ear. The term is sometimes also used for sound that is not intended to be heard.
- Inverse problem
- A problem of determining the state along the propagation path from the signals obtained after propagation, as in CT tomographic images.
- Probe
- Sound waves, light waves, or the like that are directed at an object or space of interest in order to extract information from it.
ResearchResearch themes
Centered on sound waves and ultrasound, the lab uses waves to examine the state of spaces and media, and uses ultrasound to perform tasks that are difficult to do with electricity alone. Its work covers how sound propagates, the vibration of musical instruments, devices that use ultrasound, and measurement with sound and light.
*Illustrative imageUltrasound propagation and inverse problems
The lab clarifies the characteristics of how sound waves and ultrasound propagate through gases, liquids, and solids. It also works on "inverse problems," in which the state of the medium along the path is determined from the signals that result after propagation, as in CT tomographic images.
*Illustrative imageHow musical instruments produce sound
Instruments produce their tones through complex interactions of nonlinear elements. The lab investigates the sound-production mechanisms of string and wind instruments through physical analysis and simulation.
*Illustrative imageElectronic devices using ultrasound
The lab uses ultrasound, a form of mechanical vibration, to perform tasks that would be complicated or hard to achieve with purely electrical methods. It aims to apply this to modulators, demodulators, oscillators, sensors, and more.
*Illustrative imageMeasuring space with sound and light
Using audible sound, ultrasound, and light waves as probes, the lab extracts information such as velocity, temperature, and permittivity from spaces ranging from a few nanometers to around a hundred meters, the scale of large structures such as Tokyo Dome.
MembersFaculty
The members of the Acoustic Systems Lab consist of faculty, students in the five-year integrated doctoral program, the doctoral program, the master's program, and the undergraduate program (College of Engineering Systems), and professors emeriti.As of 2026
- ProfessorNaoto Wakatsuki
- Associate ProfessorItaru Ebihara
- Associate ProfessorYuka Maeda
- Associate ProfessorKeiichi Zenpo
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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: “DL50 - glass ultrasonic delay line - ultrasonic transducer” Mister rf / CC BY-SA 4.0 (cropped)
- Ultrasound propagation and inverse problems: “Ultrasonic Testing Machine showing readings” Abhijit Nandi / CC BY-SA 3.0 (cropped)
- How musical instruments produce sound: “Wind instrument of gondi tribe” Prabhavathi anaka / CC BY-SA 4.0 (cropped)
- Electronic devices using ultrasound: “40kHz ultrasonic transducer” DMGualtieri / CC BY-SA 4.0 (cropped)
- Measuring space with sound and light: “Laser and Light Painting” ESO/M. Kornmesser / CC BY 4.0 (cropped)
- Related lab (音響システム研究室
（センシングシステム研究室） ): “LBL Acoustic Positioning Aquamap ROV” Desertstar / CC BY 3.0 (cropped) - Related lab (脳情報システム研究室): “Juggling Balls (81706016)” Richard Leonard / CC BY 2.0 (cropped)
- Related lab (機械知能研究室): “Unraveling AI Complexity - A Comparative View of AI, Machine Learning, Deep Learning, and Generative AI” PopovaZhuhadar / CC BY-SA 4.0 (cropped)
- Related lab (マニピュレーション・システム研究室): “Robotic ROV Manipulator Arm” BPLINFO / CC BY-SA 4.0 (cropped)
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