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Two-dimensional optical fiber vector microphone probe with "8" figure directivity orthogonality

A two-dimensional optical fiber and microphone technology, applied in the direction of measuring ultrasonic/sonic/infrasonic waves, instruments, measuring devices, etc., can solve the limitations of non-strict orthogonality and other problems, achieve strong anti-electromagnetic interference ability, easy to form arrays, and shape difficult effect

Inactive Publication Date: 2019-06-21
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A two-dimensional vector microphone can also be constructed by pasting two one-dimensional vector microphones, but it has the limitation of not being strictly orthogonal

Method used

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  • Two-dimensional optical fiber vector microphone probe with "8" figure directivity orthogonality
  • Two-dimensional optical fiber vector microphone probe with "8" figure directivity orthogonality
  • Two-dimensional optical fiber vector microphone probe with "8" figure directivity orthogonality

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no. 1 example

[0055] In a first exemplary embodiment of the present invention, a two-dimensional fiber optic vector microphone probe is provided. The first embodiment is a schematic structural diagram of a two-dimensional fiber optic vector microphone probe, such as figure 1 As shown, a two-dimensional fiber optic vector microphone probe in this embodiment includes: 2 groups of fiber optic sensing units for directly inducting and characterizing the velocity of the acoustic signal vector physical quantity particle, i.e. one group of fiber optic sensing units 101 and another group of fiber optic sensing units 102 , a carrier 106 and a carrier 112; the two groups of optical fiber sensitive units are composed of cascaded micro-nano fiber Bragg gratings and optical signal transmission single-mode optical fibers 105, wherein the cascaded micro-nano fiber Bragg gratings are composed of two Bragg gratings cascaded is doped with C 0 2+ Ionic special optical fiber has photothermal effect when trans...

no. 2 example

[0063] The second embodiment of the present invention is a preferred embodiment, the cascaded micro-nano fiber Bragg grating adopts doped C 0 2+ Ion's special optical fiber, under the maximum power of 500mW, when the pump light transmission wavelength is 1480nm, the maximum temperature of the special optical fiber can reach about 570°C. The central wavelengths of the reflection spectra of the two Bragg gratings at room temperature are both 1550 nm, and the length L1 of the grating section is 1.5 mm. The spacing 2*R of the grating section is 150 μm, the semicircle length pi*R is 236 μm, and the straight length L2 is 1 mm, so the total length 2*L1+pi*R+2*L2 of the cascaded micro-nano fiber Bragg grating is 5.236 mm. Buy a doped C that already has two Bragg grating cascades with the above parameters 0 2+ Ionic specialty fiber optics. Use a microscope to show the positions on both sides of the 5.236mm cascaded micro-nano fiber Bragg grating, and after accurate cutting, it is ...

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Abstract

The invention discloses a two-dimensional optical fiber vector microphone probe with "8" figure directivity orthogonality. The probe is characterized in that: the probe includes two sets of optical fiber sensing units used for sensing and representing a physical quantity mass point vibration velocity of an acoustic signal vector, a supporting body and a packaging body; the two sets of optical fiber sensing units are each composed of a cascaded micro-nano fiber Bragg grating and optical signal transmission single-mode optical fibers; the cascaded micro-nano fiber Bragg grating is composed of two micro-nano fiber Bragg gratings in cascade connection; the optical signal transmission single-mode optical fibers are divided into two segments, and are respectively fused with two ends of the cascaded micro-nano fiber Bragg grating; the supporting body is a structure body used for carrying the cascaded micro-nano fiber Bragg grating; and the packaging body is a package structure used for protecting the cascaded micro-nano fiber Bragg grating. The two-dimensional optical fiber vector microphone probe with the "8" figure directivity orthogonality is an all-fiber structure and has the characteristic of acoustic performance of two-dimensional "8" figure directivity orthogonality.

Description

technical field [0001] The invention discloses a two-dimensional optical fiber vector microphone probe with "8" directivity and orthogonality, and particularly relates to the use of an all-fiber structure for directly measuring the vibration velocity of air acoustic particles, which has strong electromagnetic interference resistance, high sensitivity, and high signal quality. It has high noise ratio, is easy to form an array, especially has the comprehensive acoustic performance characteristics of "8" directivity orthogonality, and has simple structure, small size, light weight, low cost and easy realization. Background technique [0002] With the rapid development of optical fiber sensing technology, its application range is becoming wider and wider. Compared with various traditional electric microphones, fiber optic microphones have unique advantages of fiber optics, such as anti-electromagnetic interference, high sensitivity, high signal-to-noise ratio, easy formation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
Inventor 赵龙江程进蔡彬
Owner QUFU NORMAL UNIV