Optical fiber Fabry-Perot ultrasound hydrophone and system

Abstract

The invention discloses an optical fiber Fabry-Perot ultrasound hydrophone and a system, which are used for measuring an HIFU (high intensity focused ultrasound) sound field. The system comprises a light source assembly, an optical fiber assembly, the optical fiber Fabry-Perot ultrasound hydrophone, a clamp, and a detection and feedback assembly, wherein the clamp is used for clamping the optical fiber Fabry-Perot ultrasound hydrophone, light emitted by the light source assembly reaches the optical fiber Fabry-Perot ultrasound hydrophone through the optical fiber assembly, the reflected light of the optical fiber Fabry-Perot ultrasound hydrophone, which is modulated by ultrasound, passes through the optical fiber assembly, and is received and processed by the detection and feedback assembly, the optical fiber Fabry-Perot ultrasound hydrophone comprises a single-mode optical fiber, a reflecting optical fiber and a quartz capillary tube, the two ends of the quartz capillary tube are respectively connected with the single-mode optical fiber and a reflecting optical fiber, and an air cavity in the quartz tube is an interference cavity. The optical fiber Fabry-Perot ultrasound hydrophone and the system have the advantages that the high sound pressure of the HIFU sound field can be borne, the sound pressure sensitivity is high, the space resolution is high, and meanwhile, the temperature is measured.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber Fabry-Perot (Fabry-Perot) ultrasonic hydrophone and a system. Background technique [0002] HIFU (High Intensity Focused Ultrasound, High Intensity Focused Ultrasound) technology is a non-invasive treatment technology. It focuses low-energy ultrasound outside the body on the target area in the body, and generates transient high temperature in the target area to achieve the purpose of ablation tissue. Because at the focal point of the HIFU sound field, the sound intensity of ultrasound can reach tens of thousands of W / cm2, and at the same time produce high temperature effects and sound pressure up to 100MPa, as well as accompanied by extremely strong nonlinear high-order harmonics, so in order to be able to carry out safe, For effective HIFU treatment, to avoid HUFU ultrasound damage to the normal tissues around the target area, it is ver...

AI Technical Summary

Problems solved by technology

However, in the HIFU sound field with a relatively high sound intensity level, the polymer film at the end of the sensor head or the metal layer on the reflective surface is easily damaged, and its ability to withstand high sound pressure is limited.

At the same time, because it is sensitive to both temperature and sound pressure, it will produce an interaction between temperature and sound pressure, which will bring certain difficulties to accurately separate temperature and sound pressure, resulting in a huge amount of data to be processed later, making the measurement system built by it Complicated, expensive, and difficult to promote in batches

[0007] The fiber optic FBG hydrophone can also be used to measure the sound pressure and temperature of the HIFU sound field at the same time, but it also has the problem of being sensitive to both temperature and sound pressure, which makes it difficult to accurately determine the sound pressure distribution of the HIFU sound field

At the same time, the sensing size of the fiber optic FBG hydrophone is on the order of millimeters, which is easy to introduce the space equalization effect when measuring the high-frequency ultrasonic field, which limits its spatial resolution

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