Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Wavelength division multiplexing device of optical fiber microphone based on FP interferometry principle

A technology of wavelength division multiplexing and wavelength division multiplexer, which is applied in the direction of sensors, sensor parts, electrical components, etc., can solve the problems of difficult multiplexing and large external interference of microphones, and achieves low cost and easy multiplexing. Array, the effect of strong anti-electromagnetic interference ability

Active Publication Date: 2013-07-10
THE THIRD RES INST OF CHINA ELECTRONICS TECH GRP CORP
View PDF5 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to the problems that these microphones are greatly affected by external interference and difficult to reuse.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wavelength division multiplexing device of optical fiber microphone based on FP interferometry principle
  • Wavelength division multiplexing device of optical fiber microphone based on FP interferometry principle
  • Wavelength division multiplexing device of optical fiber microphone based on FP interferometry principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Such as figure 1 Shown is the structure of a single fiber optic microphone based on the FP interference principle, including: a microphone probe 1 based on the FP interference principle to sense sound vibrations; a laser 2 capable of emitting monochromatic light; connected to the microphone probe 1 and the laser 2 respectively The unidirectional light guide unit 3; the monochromatic light emitted by the laser 2 enters the unidirectional light guide unit 3 from the port I of the unidirectional light guide unit 3 through an optical fiber, and enters the microphone probe 1 from the port II of the unidirectional light guide unit 3 Perform sound vibration induction, FP interference light enters the one-way light guide unit 3 from the port II of the one-way light guide unit 3, and then emits from the port III of the one-way light guide unit 3 into the PIN photodiode 4 for optical signal conversion into electrical signal processing ( The one-way light-guiding unit is a circula...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a wavelength division multiplexing device of an optical fiber microphone based on an FP interferometry principle. The wavelength division multiplexing device is characterized in that a laser device formed by an ASE wide-spectrum light source and a dense wavelength division multiplexer (DWDM) and a microphone probe array formed by n microphone probes are included, an output end of the DWDM is respectively connected with ports I of corresponding single-way light guide units through optical fibers, monochromatic light enters the corresponding single-way light guide units through the corresponding ports I of the single-way light guide units and then enters the corresponding microphone probes through ports II of the corresponding single-way light guide units for sound vibration sensing, FP interference light generated by the microphone probes enters the single-way light guide units from the ports II of the single-way light guide units corresponding to the microphone probes and then is emitted out from ports III of the single-way light guide units and enters PIN photodiodes corresponding to the microphone probes. The wavelength division multiplexing device has the advantages of being high in sensitivity and strong in electromagnetic interference resistant capacity, and multiplexing and array forming are easy.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a wavelength division multiplexing device of an optical fiber microphone based on the FP interference principle. Background technique [0002] A microphone is a device used to receive sound signals and convert them into electrical signals. Capacitor microphones are widely used at present. This microphone is composed of a conductive diaphragm and a metal back electrode to pick up sound signals. If the potential remains the same, the sound will cause the storage capacity of the capacitor to change, thereby converting the acoustic signal into an electrical signal. Since the capacitance value is very small and its impedance is large, this microphone must be equipped with a preamplifier circuit for impedance transformation to ensure that the microphone can be connected to other circuits. Although the condenser microphone has excellent frequency response characteristics...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04R23/00
Inventor 赵龙江冯杰程进侯志国周瑜魏晓玲
Owner THE THIRD RES INST OF CHINA ELECTRONICS TECH GRP CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com