Light driven ultrasonic probe and ultrasonic imaging system thereof

Abstract

The invention relates to a light driven ultrasonic probe and an ultrasonic imaging system thereof. A Fabry-Perot (F-P) cavity (106) which receives ultrasonic signals is positioned in the center of anphoto-acoustic emitter (101). The photo-acoustic emitter (101) comprises a photo-acoustic conversion film (102) generating ultrasound, a transparent substrate (103), and a support pedestal (104) whichsupporting the photo-acoustic conversion film (102) and the transparent substrate (103). The upper surface of the transparent substrate (103) is coated with the photo-acoustic conversion film (102),and the lower surface of the transparent substrate (103) is welded to the front surface of the support pedestal (104). A light absorption layer and a thermo-elastic layer are deposited successively inthe upper surface of the transparent substrate. The ultrasonic imaging system of the light driven ultrasonic probe is used to convert an array pulse laser beam into pulse ultrasound, and radiate theultrasound on a target. Ultrasonic echoes reflected from the target reaches the F-P cavity of the light driven ultrasonic probe, detection laser enters the head of the F-P cavity, and cavity length change caused by ultrasonic pressure of the F-P cavity is detected.

Description

technical field [0001] The invention relates to an ultrasonic phased array probe and an ultrasonic imaging system thereof. Background technique [0002] Ultrasonic technology is widely used in industrial non-destructive testing, medical diagnosis and treatment, underwater communication and positioning, material testing and analysis, and plays an important role in social life and industrial production. At present, ultrasound is mainly generated by electrically driven ultrasonic transducers, which are devices that convert electrical energy into acoustic energy. According to the principle of energy conversion and the different materials used, they can be divided into piezoelectric type, capacitive, mechanical, and magnetostrictive transducers. In recent years, phased array ultrasonic medical detection has been widely developed and applied. Since phased array ultrasonic does not require complex mechanical scanning devices, it can flexibly and effectively control the sound beam,...

AI Technical Summary

Problems solved by technology

[0006] In addition, the photoinduced ultrasonic transducers or photoacoustic probes currently designed and developed are only light-driven ultrasonic transducer devices based on a single mode of ultrasonic emission, and the reception of ultrasonic echoes still requires the use of piezoelectric ultrasonic probes with high-frequency bandwidth capabilities. On the contrary, the whole ultrasound imaging system becomes extremely complex and huge

[0007] For example, when using a high-frequency piezoelectric ultrasonic probe to receive ultrasonic echoes, it is necessary to solve the problem of matching the bandwidth of the photoacoustic transducer with a single emission ultrasonic mode. A piezoelectric transducer with a low bandwidth does not have a high-frequency part for receiving ultrasonic waves. The ability of information, and usually the pulsed ultrasound generated by the photoacoustic transducer has a large bandwidth characteristic, which brings great difficulties to the selection of the receiving ultrasonic transducer

[0008] Therefore, it is important to realize this kind of optically driven ultrasonic phased array probe. By controlling the time delay of each beam emission, the purpose of controlling the ultrasonic phase delay is achieved, so as to realize various phase control such as beam focusing, deflection, and beam forming. effects, while avoiding the disadvantages of traditional electronic ultrasonic phased array probes such as inherent line crosstalk, and how to simultaneously realize the optical reception of ultrasound, and realize the ultrasonic imaging device using this ultrasonic probe

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