Real-time extracting device and detection method for focused ultrasonic cavitation and microbubbles thereof

Abstract

The invention belongs to the technical field of ultrasonic cavitation detection and signal analysis, and relates to a method and a device for separating and detecting focused ultrasonic cavitation signals. An ultrasonic transducer of a device emits cavitation detecting signals in a pulse-inversion mode, and another ultrasonic transducer receives acoustic signals diffused by ultrasonic cavitation and movement of microbubbles; a transducer of another device generates cavitation signals in the pulse-inversion mode; for each cavitation detecting experiment, the detection method extracts background signals when the cavitation does not happen, respectively calculates power spectrums of the acquired cavitation acoustic signals and the background signals, calculates the subtracted power spectrum estimation and phase position estimation, and converts the power spectrum estimation and the phase position estimation into time domain signals to filter noise of a system; and an ICA method separatestarget signals such as broadband noise component, subharmonic and the like in cavitation acoustic signals from other signal components and extracts characteristic parameters of the cavitation acoustic signals. The detection method has high sensitivity and can perform quantitative analysis.

Description

Focused ultrasonic cavitation and its micro-bubble real-time extraction device and detection method technical field The invention belongs to the technical field of ultrasonic cavitation detection and analysis, and relates to a focused ultrasonic cavitation based on pulse reversal and a real-time extraction device and detection method for micro-bubbles. Background technique There are two main mechanisms of action between ultrasound and tissue: heat and cavitation. Cavitation refers to the cavitation nuclei (tiny bubbles or bubbles caused by high heat of focused ultrasound) in the liquid. A series of dynamic processes such as expansion, contraction and implosion. The cavitation process is divided into two types: ① Steady-state cavitation characterized by non-inertial cavitation. ② Transient cavitation characterized by inertial cavitation. When there are cavitation nuclei in the medium, acoustic cavitation will occur when the sound intensity exceeds a certain intensity. Vi...

AI Technical Summary

Problems solved by technology

Aiming at the technical problem that the cavitation signal in the prior art is easily covered by the fundamental wave and difficult to quantify, the present invention proposes a method and device for real-time extraction and detection of focused ultrasonic cavitation and its micro-bubbles based on pulse inversion, to realize the Ultrasonic cavitation and real-time identification and detection of micro-bubbles

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