End sensitive fiber bragg grating high-intensity focused ultrasound sensor and system

Abstract

The invention provides an end sensitive fiber bragg grating high-intensity focused ultrasound sensor which has the grating region length L2, and a central position of a grating region is positioned within a range which covers a distance of L1 away from a single-mode fiber end. The end sensitive fiber bragg grating high-intensity focused ultrasound sensor provided by the invention has higher sound pressure sensitivity than that of a luminous intensity type fiber optic hydrophone which is based on a Fresnel end face reflection principle, is of a full quartz structure, adopts an end sensitive structure and has strong sound pressure bearing capability; compared with a lateral sensitive fiber bragg grating high-intensity focused ultrasound sensor, the end sensitive fiber bragg grating high-intensity focused ultrasound sensor is easy to clamp, is prevented from being damaged by shock wave and can overcome the disturbance of ultrasonic standing wave; different types of membranes are plated on the end sensitive fiber bragg grating high-intensity focused ultrasound sensor, so that the sound pressure resistance or the sound pressure sensitivity can be increased; the end sensitive fiber bragg grating high-intensity focused ultrasound sensor which is added into an annular tube sheath can be prevented from being damaged by the cavitation effect of a sound field; and the end sensitive fiber bragg grating high-intensity focused ultrasound sensor system is simple, and can satisfy requirements on MHz ultrasound measurement.

Description

technical field [0001] The invention specifically relates to an end-sensitive fiber grating high-intensity focused ultrasound (High Intensity Focused Ultrasound) sensor and system, which can accurately and quickly measure the distribution of the high-intensity focused ultrasound sound field, and belongs to the field of sensing technology. Background technique [0002] High-intensity focused ultrasound therapy is an emerging non-invasive / minimally invasive treatment of tumors and cancers. High-intensity focused ultrasound therapy uses the huge energy generated by focused ultrasound to kill tumor cells in the focused area of ​​ultrasound, while the surrounding tissue is less damaged, and it has the advantages of non-invasive treatment. In order to carry out complete and effective high-intensity focused ultrasound therapy, it is necessary to accurately determine the high-intensity focused ultrasound field distribution, acoustic energy distribution and the size of the acoustic f...

AI Technical Summary

Problems solved by technology

Fiber Bragg grating has the advantages of high sound pressure sensitivity and high sound pressure resistance. The above-mentioned research work uses the method of fiber Bragg grating lateral sensitivity for low-intensity ultrasonic measurement. This method has low spatial resolution, is difficult to clamp, and is easily affected by standing waves. interference, and is easily damaged by shock waves, not suitable for high-intensity focused ultrasound sound field sensing and measurement

At present, there is no report on the end-sensitive fiber grating high-intensity focused ultrasound sensor

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