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Fiber Grating Microphone

A fiber grating and microphone technology, applied in the direction of sensor components, sensors, electrical components, etc., can solve problems such as signal failure and failure of fiber optic microphones, and achieve the effect of improving stability

Active Publication Date: 2020-10-02
LASER RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the sensitivity of the traditional high-sensitivity fiber optic microphone reaches -62dBre1nm / Pa, and its use environment often has static pressure changes. Pa, and in the valleys on the eastern edge of the Tibetan Plateau, the daily amplitude of the air pressure can sometimes reach 6.5 hectopascals, and the annual variation may reach tens of hepascals. The incoming signal fails

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Embodiment Construction

[0024] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all the embodiments. The components of the embodiments of the present invention generally described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ...

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Abstract

The embodiment of the invention provides a fiber grating microphone, comprising a main body barrel, a step, a micro-sound transmission hole, a bottom cover, a through hole, a pressure ring, a diaphragm, a top cover, a sound transmission hole, a fiber grating and a capillary tube. The combination of various structures forms a cavity located in the fiber grating microphone. Acoustically, an acousticstructure consisting of the capillary tube and the cavity has a low-pass sound filtering function, a large static pressure change or quasi-static pressure intensity change can be transmitted to the cavity through the capillary tube, but high-frequency sound waves cannot be transmitted to the cavity through the capillary tube, and thus the desensitization of the static pressure and low-frequency pressure intensity changes can be achieved, and the stability of the fiber grating microphone can be improved.

Description

Technical field [0001] The invention relates to the field of optical components, and in particular to a fiber grating microphone. Background technique [0002] Optical fiber microphone is a sensor that uses the light transmission characteristics of optical fiber and the modulation effect of sound waves on the optical signal in the optical fiber to detect sound signals. Compared with traditional electrical microphones, fiber-optic microphones have obvious advantages in sensitivity, dynamic range, environmental adaptability, anti-electromagnetic interference, and reliability. In particular, fiber-optic microphones are passive in nature and can be used in coal mines with high requirements for explosion protection. It is used in occasions, and the optical fiber microphone is resistant to electromagnetic interference and corrosion, which has important application value in national defense and military applications. [0003] However, the sensitivity of traditional high-sensitivity optic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R23/00
CPCH04R23/00
Inventor 张发祥张晓磊王英英倪家升王昌姜劭栋
Owner LASER RES INST OF SHANDONG ACAD OF SCI