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
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Problems solved by technology

This leads to the problems that these microphones are great

Method used

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  • 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

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[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 induce sound vibration; a laser 2 capable of emitting monochromatic light; connected to the microphone probe 1 and laser 2 respectively The unidirectional light guide unit 3; the monochromatic light emitted by the laser 2 enters the unidirectional light guide unit 3 through the optical fiber from port I of the unidirectional light guide unit 3, and is emitted from the port II of the unidirectional light guide unit 3 into the microphone probe 1 For sound vibration sensing, FP interference light enters the unidirectional light guide unit 3 from port II of the unidirectional light guide unit 3, and then exits from the port III of the unidirectional light guide unit 3 into the PIN photodiode 4 for optical signal conversion into electrical signal processing ( The unidirectional light guide u...

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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

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Application Information

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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
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