Measurement of pressure amplitude of ultrasonic standing wave based on method of obtaining optical wavefront using phase retrieval

Self Cite

Measurementthe act of measuring physical properties that we performhas the potential to contribute to the successful advancement of sciences and society. To open doors in physics and other sciences, various measurement methods and related applications have been developed, and ultrasound has remained a useful probe, power source, and interesting measurement object for the past two centuries. In this paper, we first summarize the basic principles of ultrasound from the viewpoint of measurement techniques for readers who just have started studying or are interested in the field of ultrasonic electronics. Moreover, we also introduce recent studiesultrasonic properties of materials, measurement techniques, piezoelectric devices, nonlinear acoustics, biomedical ultrasound, and ocean acousticsand their trends related to measurement techniques in ultrasonic electronics to provide some ideas for related applications.

Section: General Topicmentioning

confidence: 99%

Section: Nonlinear Acoustics High-power Ultrasound Sonochemistrymentioning

confidence: 99%

Introduction of measurement techniques in ultrasonic electronics: Basic principles and recent trends

Mizutani¹,

Wakatsuki²,

Ebihara³

2016

Self Cite

“…The conventional way to measure ultrasound pressure field is the hydrophone method, [24][25][26] which takes a long measurement time and might disturb the ultrasound field. Another alternative method that caught our attention is the optical method [6][7][8][9][10][11][12][13][14][15][16][17] which conventionally gives a qualitative ultrasound field mapping, [8][9][10][11][12] but takes a short measurement time and does not interfere with the ultrasound field.…”

Section: Introductionmentioning

confidence: 99%

“…First is the optical intensity, 6,14,15,17) and second is the optical phase. 7,13,16) Both of these parameters are variances that are modulated by the ultrasound propagation in water. The method that uses the former parameter is called Shadowgraph, 14,15,17) while the method that uses the latter parameter is called Phase Contrast.…”

Section: Introductionmentioning

confidence: 99%

Quantitative measurement of high intensity focused ultrasound pressure field by optical phase contrast method applying non-continuous phase unwrapping algorithm

Syahid

Oyama

Yasuda

et al. 2015

A fast and accurate ultrasound pressure field measurement is necessary for the progress of ultrasound application in medicine. In general, a hydrophone is used to measure the ultrasound field, which takes a long measurement time and might disturb the ultrasound field. Hence, we proposed a new method categorized in an optical method called Phase Contrast method to overcome the drawback in the hydrophone method. The proposed method makes use of the spatial DC spectrum formed in the focal plane to measure the modulated optical phase induced by ultrasound propagation in water. In this study, we take into account the decreased intensity of the DC spectrum at high ultrasound intensity to increase the measurement accuracy of the modulated optical phase. Then, we apply a non-continuous phase unwrapping algorithm to unwrap the modulated optical phase at high ultrasound intensity. From, the unwrapped result, we evaluate the quantitativeness of the proposed method.

“…where A, d, γ, and ðr 0 ; tÞ are the maximum light intensity, focal spot diameter, piezo-optical coefficient, and displacement vector of the focal spot, respectively. 19) The operator ∇ is ð@=@x; @=@yÞ. The suffix 0 means the incident point of the laser beam.…”

mentioning

confidence: 99%

Optical measurement of instantaneous ultrasound field containing light scatterers based on laser deflection method

Kuroyama

Mizutani

2018

Self Cite

An optical measurement method for the ultrasound field in water containing light scatterers is proposed. Using the proposed method, we can reconstruct the pressure field from the pressure gradient obtained by light deflection measurement based on the principle of the Shack–Hartmann wavefront sensor. The ultrasound field with and without light scatterers is measured by the proposed method and the measurement results are compared. The measurement results are almost the same regardless of the presence of light scatterers, and the robustness of the proposed method to light scatterers is confirmed.