CN214372897U

CN214372897U - A device for improving directional sensitivity of EFPI diaphragm

Info

Publication number: CN214372897U
Application number: CN202120420164.5U
Authority: CN
Inventors: 司文荣; 傅晨钊; 虞益挺; 姚维强; 关宏; 苏卫华; 倪鹤立; 刘家妤
Original assignee: State Grid Shanghai Electric Power Co Ltd
Current assignee: State Grid Shanghai Electric Power Co Ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-10-08
Anticipated expiration: 2031-02-26

Abstract

The utility model relates to an EFPI diaphragm directional sensitivity lifting device. The device is installed on the diaphragm of an EFPI optical fiber sensor probe. The lifting device comprises a mass block, which is installed on the diaphragm of the EFPI optical fiber sensor probe. , thus forming a new type of diaphragm structure with different natural frequencies and response sensitivities. Compared with the prior art, the utility model can have relatively consistent sensitivity and response characteristics within the range of the ultrasonic incident angle of 0-180°, and can adjust the natural frequency of the diaphragm and the like.

Description

EFPI diaphragm directionality sensitivity hoisting device

Technical Field

The utility model relates to an EFPI optical fiber sensor probe especially relates to an EFPI diaphragm directionality sensitivity hoisting device.

Background

The optical fiber sensor based on the optical fiber coupling technology has a good application prospect in detection of Partial Discharge (PD) ultrasonic waves, optical signals and pulse current of electrical equipment. Through the development and exploration of related technologies for many years, an extrinsic Fabry-Perot interferometer (EFPI) optical fiber sensor method, namely an EFPI optical fiber sensor, is widely researched and applied to ultrasonic signal detection of partial discharge of electrical equipment such as transformers and gas insulated switchgear. The principle of the EFPI optical fiber sensor and a common diaphragm structure are shown in figures 1-4, and the EFPI optical fiber sensor is a high-performance acoustic ultrasonic wave detection system which converts ultrasonic waves into mechanical vibration by using a sensitive diaphragm structure, converts the mechanical vibration into optical parameter change by using a Fabry-Perot interference technology, and finally converts, collects and demodulates the optical parameter change by related instruments such as a photoelectric detector and the like. However, research and practical engineering show that the conventional planar diaphragm structure has certain defects in directional sensitivity, and the consistency difference in the sensitivity response of the ultrasonic incident angle of 0-180 degrees is large.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects of the prior art and providing an EFPI diaphragm directivity sensitivity lifting device, introducing a mass block structure in the center of the diaphragm, having more consistent sensitivity response characteristic within the range of 0-180 degrees of ultrasonic incidence angle and being capable of adjusting the natural frequency of the diaphragm.

The purpose of the utility model can be realized through the following technical scheme:

according to the utility model discloses an aspect provides an EFPI diaphragm directionality sensitivity hoisting device, and the device is installed on the diaphragm of EFPI fiber sensor probe, hoisting device include the quality piece, this quality piece is installed on the diaphragm of EFPI fiber sensor probe to constitute the novel diaphragm structure that has different natural frequencies and response sensitivity.

Preferably, the mass is mounted at the center of the diaphragm.

As a preferred technical scheme, the mass block is of a square-table structure.

Preferably, the mass block comprises a mass block front surface and four mass block side walls, and the mass block front surface and the four mass block side walls form an ultrasonic three-dimensional receiving surface.

As a preferred technical scheme, the side wall of the mass block is of a trapezoidal structure.

As a preferred technical scheme, the mass block is of a pyramid structure.

As a preferable technical scheme, the mass block comprises four mass block side walls in a triangular structure.

As a preferred technical solution, the mass block is a prism-shaped structure.

Preferably, the mass comprises a front surface and four side walls.

As a preferred technical scheme, the side wall of the mass block is of a rectangular structure.

The utility model discloses compare in plane diaphragm, adopt the less and thicker quality piece structure of thickness of size to improve the directional sensitivity of diaphragm, when the ultrasonic wave of equidirectional not acts on the quality piece lateral wall promptly, the quality piece receives the acoustic pressure effect and arouses the diaphragm to warp, makes EFPI optical fiber sensor probe chamber length change produce corresponding light intensity change to detect the ultrasonic signal that wider incident angle scope satisfies 0-180 promptly.

Drawings

FIG. 1 is a schematic diagram of an EFPI fiber optic sensor;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic structural diagram of a conventional diaphragm I;

FIG. 4 is a schematic structural diagram of a second common diaphragm;

FIG. 5 is a schematic structural view of embodiment 1;

FIG. 6 is a schematic structural view of embodiment 2;

FIG. 7 is a schematic structural view of embodiment 3.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 5, the directional sensitivity improving device for the EFPI membrane is installed on the membrane 1 of the EFPI fiber sensor probe, and the improving device comprises a mass block 2, and the mass block 2 is installed on the membrane 1 of the EFPI fiber sensor probe, so that a novel membrane structure with different natural frequencies and response sensitivities is formed.

The mass block is arranged at the central position of the diaphragm. The mass block is of a square-table structure. The mass block comprises a mass block front surface 3 and four mass block side walls 4, and the mass block front surface 3 and the four mass block side walls 4 form an ultrasonic three-dimensional receiving surface.

When the EFPI optical fiber sensor probe works, the diaphragm 1 converts ultrasonic waves into mechanical vibration. Due to the introduction of the mass block 2, the plane of the central mass block of the planar membrane in fig. 5 is converted into an ultrasonic three-dimensional receiving plane consisting of the front surface 3 of the mass block and four side walls 4 of the mass block, so that an ultrasonic signal with a wider incidence angle range, namely, meeting 0-180 degrees, is detected. At the moment, the thickness T and the side length l of the mass block are increased by the design parameter thickness h and the equivalent working radius a of the planar diaphragm of the diaphragm structure of the probe, so that the requirement for detecting the PD ultrasonic signals of electrical equipment is further met.

The utility model discloses a introduce quality block structure at EFPI optical fiber sensor probe diaphragm center, can the integrated design have different natural frequency and response sensitivity's novel diaphragm structure. Compared with a planar diaphragm, the mass block structure with smaller size and thicker thickness can improve the directional sensitivity of the diaphragm, namely when sound waves in different directions act on the side wall of the mass block, the mass block is subjected to sound pressure action to cause the diaphragm to deform, so that the length of the probe cavity of the EFPI optical fiber sensor changes to generate corresponding light intensity change, and accordingly ultrasonic signals with wider incidence angle range meeting the requirement of 0-180 degrees are detected.

Example 2

As shown in fig. 6, the mass block has a pyramid structure, and the mass block includes four mass block sidewalls having a triangular structure, which is the same as that in embodiment 1.

Example 3

As shown in fig. 7, the mass block has a prism structure, the mass block includes a front surface and four side walls, and the side walls of the mass block have a rectangular structure, which is the same as that of embodiment 1.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An EFPI diaphragm directional sensitivity lifting device, the device is installed on the diaphragm of the EFPI fiber optic sensor probe, it is characterized in that, the described lifting device comprises a mass block, and this mass block is installed on the membrane of the EFPI fiber optic sensor probe. On-chip, thus forming a new type of diaphragm structure with different natural frequencies and response sensitivities.

2 . The device for improving the directional sensitivity of an EFPI diaphragm according to claim 1 , wherein the mass block is installed at the center of the diaphragm. 3 .

3 . The device for improving the directional sensitivity of an EFPI diaphragm according to claim 1 , wherein the mass block is of a square table structure. 4 .

4 . The device for improving the directional sensitivity of an EFPI diaphragm according to claim 3 , wherein the mass block comprises a mass block front surface and four mass block side walls, the one mass block front surface and four mass block side walls. 5 . The side wall of the mass block constitutes an ultrasonic three-dimensional receiving surface.

5 . The device for improving the directional sensitivity of an EFPI diaphragm according to claim 4 , wherein the side wall of the mass block is a trapezoidal structure. 6 .

6 . The device for improving the directional sensitivity of an EFPI diaphragm according to claim 1 , wherein the mass block is a pyramid-shaped structure. 7 .

7 . The device for improving the directional sensitivity of an EFPI diaphragm according to claim 6 , wherein the mass block comprises four side walls of the mass block with a triangular structure. 8 .

8 . The device for improving the directional sensitivity of an EFPI diaphragm according to claim 1 , wherein the mass block has a prismatic structure. 9 .

9 . The device for improving the directional sensitivity of an EFPI diaphragm according to claim 8 , wherein the mass block comprises a front face of the mass block and four side walls of the mass block. 10 .

10 . The device for improving the directional sensitivity of an EFPI diaphragm according to claim 9 , wherein the side wall of the mass block is a rectangular structure. 11 .