Research On Sound Intensity And Sound Power Measurement Of High Intensity Focused Ultrasound

In recent years,High Intensity Focused Ultrasound(HIFU)technology has significant development in medical and ultrasonic.The measurement of sound power is primarily achieved by Radiant Force Balance(RFB).Since the HIFU produce high energy,it could easily cause permanent thermal damage and mechanical damage on the absorption target of the radiation balance.While it is not comprehensive for the judgement of HIFU that the radiation balance obtains a single power indicator.In order to solve the above problems,to find a new method which based on near-field measurement and sound intensity method is necessary.The new method obtains the sound intensity distribution and the sound power of the high intensity focused ultrasound by measuring the focus area of HIFU through the sound intensity measurement platform.This assessment designs the sound intensity measurement system,and research the related theories and experiments.(1)Summarize the background and presented researches.(2)Simply introduce some basic concepts of acoustic measurement and sound intensity method,otherwise introduce the near-field cross-spectrum measurement method which is according to the principle of sound intensity method.(3)Build the hardware part of the underwater sound intensity measurement system,explain the signal excitation part,data collection part and motion control part.The article improves the software of the underwater sound intensity measurement system,combine the motion control part and data collection data part due to achieve the function that scan sound field.In addition,the assessment computes the sound intensity by LabVIEW.(4)The experiment of the measuring the HIFU sound intensity and power via near-field cross-spectrum.Meanwhile,there is a comparison experiment which includes using different types of hydrophone and radiation force method of balance.Through those experiments,the effective of the near-field cross spectrum method could be verified.(5)The measurement of the sound field of the high-intensity focused ultrasoundand the sound field of the planar piston transformer by the near-field cross-spectrum method,The experiment verify the accuracy of near-field cross-spectrum measurement.