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Applied optical measurements

We develop measurement methods of three-dimensional spatial distribution of particles by using a single camera. The light is classified into coherent light (laser beams) and incoherent light (visible light). Especially, we develop and apply “Digital holography” (as application of coherent light) and “Depth-from-defocus” (as application of incoherent light), respectively. Additionally, we develop vibration measurements by using digital laser speckle method.
Glossary on Digital holography
Report on Digital holography
Report on Depth-from-defocus
Report on Speckle interferometer

Speckle pattern

Measurement of small particles

speckle

Holographic patterns of small particles

Speckle pattern

Experimental setup for measuring a vibrating plate

speckle

Speckle pattern of a vibrating plate

Speckle pattern

Centrifugal pump and optical setup for digital in-line holography

speckle

Holographic patterns of tracer particles in a pump casing

Fizeau interferometry

Fizeau interferometry

Fizeau interferometry

Interference pattern

digital holography

Stress Measurement of Cantilever Beam under Dynamic Load by Holographic Particle-Tracking Velocimetry
[Keywords: Digital holography, PR model, Three-dimensional stress field]

To toppage of Research topics

Particle Image Velocimetry

In this topic, we focus on visualization methods, algorithms and applied measurement of industrial problems. Generally, the technique which makes an invisible fluid flow into a visible one is called “Flow visualization”. The flow visualized by small tracer particles is recorded as time series images by using a high speed camera. The method to calculate a velocity field from the time series images is known as PIV (Particle Image Velocimetry).

Glossary on Particle image velocimetry
Report on Particle image velocimetry
Report on Multiphase flow

Speckle pattern

Water channel

speckle

NACA0012: Particle path

speckle

NACA0012: Visualization

speckle

NACA0012: PIV measurement（Click）

digital holography

Interaction between a Burgers vortex and wake vortex structure generated by a settling particle
[Keywords: Multiphase flow, 2D PIV, paticulate-turbulent phenomena, Quasi-three dimensional vorticity field]

To toppage of Research topics

Measurement system based on MEMS sensor

Human five senses have an important role to qualitatively grasp phenomena in wide fields from arts to industrial engineering. On the other hand, sensors which detect phenomena as an electrical signal can grasp phenomena quantitatively, and can deeply understand phenomena beyond human senses. In this topic, we evaluate various phenomena by using a multiple sensor system. For example acoustic cavity resonance is measured by sensitive microphone sensors. we propose improvement of acoustic properties and acoustic evaluation methods.
Report on Measurement system based on MEMS sensor

Speckle pattern

Double sided circuit board

speckle

Electronic circuit fabrication



© Measurement System Laboratory, Kyoto Institute of Technology.