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Wave Measurement Engineering Lab
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A lab that uses light and ultrasound to measure the internal viscoelasticity of samples without destroying them.
AboutAbout the lab
Measuring a sample's internal viscoelasticity without destroying it
The Wave Measurement Engineering Lab studies methods for measuring the internal viscoelasticity of a sample without destroying it.
By developing measurement devices that use light and ultrasound, and by analyzing how elastic waves propagate, the lab aims to create new methods for measuring viscoelasticity.
The measurement targets are wide-ranging, including biological samples, polymer materials, and metals.
The lab is a new lab established at Yokohama National University in October 2025.
Key terms
- Viscoelasticity
- A quantity describing how a sample deforms when force is applied. It is an indicator of whether a part can withstand force and keep its shape.
- Destructive testing
- A method, such as a tensile test, in which the sample is shaped into a test piece and then measured. It is difficult to reuse the sample after measurement.
- Elastic wave
- A wave that propagates inside or along the surface of a sample. It is accompanied by minute displacement as it travels.
ResearchResearch themes
The lab focuses on elastic waves propagating inside a sample, aiming to quantitatively visualize the distribution of viscoelasticity. Tensile tests and similar methods measure only the average viscoelasticity of a sample, so examining its internal distribution is difficult.
*Illustrative imageNon-destructive measurement and visualization
Destructive tests such as tensile tests require shaping the sample into test pieces, which makes it difficult to reuse the sample after measurement. According to the lab, if the interior can be visualized without destroying the sample, this may be applicable to inspecting every item of industrial products and cells for regenerative medicine.
*Illustrative imageMeasuring elastic waves with light and ultrasound
The displacement of elastic waves appearing on a sample's surface is measured with devices that combine optical interferometers and laser Doppler vibrometers. Elastic waves propagating inside the sample are measured as spatiotemporal displacement using high-frequency ultrasound.
MembersFaculty
The members of the Wave Measurement Engineering Lab consist of faculty and undergraduate students.As of 2026
- Assistant ProfessorKazuki Tamura
VoicesStudent voices
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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: “Reomeeter” Kaisa Rongas / CC0 (cropped)
- Non-destructive measurement and visualization: “Nondestructive testing Prommashkomplekt” Balashka at Russian Wikipedia / CC0 (cropped)
- Measuring elastic waves with light and ultrasound: “Ultrasonic laser” Fede Bandi 91 / CC BY-SA 4.0 (cropped)
- Related lab (Bio-Mechanical Systems Lab): “Test Bench at the Fraunhofer LBF for active vibration control” Thomas Ernsting / CC BY-SA 4.0 (cropped)
- Related lab (Mathematical Modeling Lab): “Finite element sparse matrix” Oleg Alexandrov / Public domain (cropped)
- Related lab (Fluid Engineering Lab): “MDH turbine pump top view” Adakiko / CC BY-SA 4.0 (cropped)
- Related lab (Computational Materials Mechanics Lab): “Fluid-Structure-Interaction-Topology-Optimization-2” Chrlundg / CC BY-SA 4.0 (cropped)
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