Measurement of temperature decrease caused by blood flow in focused ultrasound irradiation by thermal imaging method

We propose a method for monitoring the surface hardness of cement during curing by using high-intensity aerial ultrasonic waves and optical equipment. Our method estimates the progress of curing from the vibrations generated on the object surface by aerial ultrasonic wave irradiation. We monitored cement curing from a liquid state immediately after placement in real time and investigated a method for decreasing the dispersion of the measured values. As a result, we demonstrated that cement could be monitored from the liquid state to the solid state after placement. In addition, we confirmed that the effects of various external factors were avoided by using median measurement values.

Section: Experimental Apparatus and Measurement Methodsmentioning

confidence: 99%

Surface hardness monitoring of cement during curing by high-intensity aerial ultrasonic waves

Fujiwara

Osumi

Ito

2017

“…Subsequently, a sound waveguide was installed to obtain a higher sound pressure by the convergence of the sound waves. [26][27][28][29][30] The effects of the input power and droplet volume on the impregnation of droplets into the mesh were also inves-tigated. Finally, the results of impregnation with and without the sound waveguide were compared.…”

Section: Introductionmentioning

confidence: 99%

Deformation and impregnation of droplets containing abrasive grains using intense aerial ultrasonic waves

Nakayama¹,

Asami²,

Miura³

2018

For efficient impregnation, it is important to improve the wettability between the samples used. However, the traditional impregnation method using ultrasonic waves suffers from the following problems: that the vibration source must be brought into direct contact with the sample and impregnation with liquids with high viscosities is difficult. Also, the method has the possibility that impurities will be mixed in the sample when bringing the ultrasonic vibration source directly into contact with the sample. Therefore, we investigated the use of intense aerial ultrasonic waves as a new noncontact method of impregnating into meshes while observing the extent of the droplet spread. In this study, we observed droplet deformation and impregnation when changing the droplet volume and input power and after installing a sound waveguide for focusing the sound wave. Consequently, we were consequently able to demonstrate the impregnation of droplets into the mesh.

“…As a result, the mechanical friction that will be a cause of the major error factor in conventional measurement methods is absolutely reduced, and then the accurate measurement could be performed even if elasticity and viscosity are low. 11,12) It is of course important from the viewpoints of biological and medical sciences to determine the accurate values of elasticity and viscosity since ultrasonic propagation is determined by viscoelasticity; [13][14][15][16][17][18] the difference between these values in the ultrasonic and rheological frequency region gives important information [19][20][21][22] on the mechanical relaxation originating from the molecular dynamics. This study is conducted to observe the structure forming and collapsing in a sol-gel phase transition, and develop a method of developing the transition point using the newly developed measurement system.…”

mentioning

confidence: 99%

Simple and accurate determination of sol–gel phase transition point using disk-type electromagnetically spinning viscosity measurement system

Hirano¹,

Sakai

2017

We performed viscosity measurements with ultrahigh sensitivity by combining our original electromagnetically spinning technique and a newly developed floating disk probe. This system is, in principle, a torque-control-type viscometer with a noncontact function that can apply an arbitrary low torque, and therefore, enables us to clearly distinguish between liquids and solids from the viewpoint of the mechanical property of materials. In our measurements, we examined the difference in the thermoreversible sol–gel transition of a methylcellulose solution to determine the precise transition points, and successfully observed the hysteresis behavior of the gelation and solation processes.