Optical fiber mini-sized hydrophone

Abstract

The invention discloses an optical fiber mini-sized hydrophone belonging to a sound pressure sensor technology field. The optical fiber mini-sized hydrophone comprises a four-layer structure. A first layer is a diaphragm, which is a PDMS flat diaphragm or a PET convolution diaphragm. A second layer is a first supporting layer having a circular through hole in a center, and a third layer is the second supporting layer having the circular through hole in the center. The fourth layer is the third supporting layer having a circular through hole in the center and an air vent hole in an edge. The center of the diaphragm, the center of the first supporting layer, the center of the second supporting layer, and the center of the third supporting layer are sequentially aligned with each other, and are bonded together. The diameter of the circular through hole of the first supporting layer, the diameter of the circular through hole of the second supporting layer, and the diameter of the circular through hole of the third supporting layer are reduced sequentially, and the above mentioned circular through holes of the supporting layers are in a ladder-shaped arrangement. An inserting core is disposed in the circular through hole of the third supporting layer, and an optical fiber is inserted in the inserting core. An F-P cavity is arranged from the diaphragm to the end surface of the optical fiber. The optical fiber mini-sized hydrophone is used to solve technical problems caused by the materials or the shapes of the diaphragms.

Description

technical field [0001] The optical fiber miniature hydrophone of the invention belongs to the technical field of sound pressure sensors. Background technique [0002] At this stage, a type of diaphragm-type optical fiber F-P (Fabry-Perot) hydrophone has emerged, which has the technical advantages of high sensitivity and fast response in principle. The characteristic of this type of hydrophone is that the sensitive diaphragm and the end face of the optical fiber form an F-P cavity. The external sound pressure signal will cause the sensitive diaphragm to vibrate, thereby changing the cavity length of the F-P cavity, resulting in a change in the reflected light signal. By detecting this change, The detection of information related to external sound pressure can be realized. [0003] The performance of a hydrophone is directly related to the diaphragm. At present, the diaphragms of this type of hydrophone are flat films made of silicon, silicon dioxide, silicon nitride or PET ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of diaphragm material and diaphragm shape of diaphragm type optical fiber F-P (Fabry-Perot) hydrophone, the invention discloses an optical fiber miniature hydrophone; Silicon and silicon nitride diaphragms have complex processing technology, long production cycle, and high cost, and the thickness of PET-based diaphragms cannot be reduced due to the processing technology, which reduces the mechanical sensitivity; by changing the diaphragm Shape, which solves the problem that the surface shape error is transmitted to the reflected light signal, causing errors in the reflected light signal and reducing the accuracy of detection

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