The invention belongs to the technical field of fiber optic acoustic sensing, and provides a mine passive sound pickup device, comprising a laser, a first fiber optic coupler, a delay optical fiber, asecond fiber optic coupler, a 1*N optical switch, an armored cable, a plurality of sound pickup probes, a balanced photodetector, a field programmable gate array (FPGA) processing module, an acquisition card and an upper computer, wherein light emitted by the laser passes through the first fiber optic coupler, then separately and directly enters the first fiber optic coupler and the delay opticalfiber, and then enters the second fiber optic coupler; an output end of the second fiber optic coupler is connected with the armored cable by means of the 1*N optical switch; the plurality of sound pickup probes are respectively connected in series in multiple sensing optical paths of the armored cable; optical signals returned to the first fiber optic coupler from the sound pickup probes are detected by means of the balanced photodetector; the output end of the balanced photodetector are separately connected with the acquisition card and the upper computer by means of the FPGA processing module. The mine passive sound pickup device is high in sensitivity and good in anti-vibration interference performance, thus being widely applied to the field of mine sound pickup.

Mine passive sound pickup device

The invention provides a micro-nano fiber grating two-dimensional vibration sensor integrated with microbubbles at an end and a manufacturing method thereof. The sensor comprises a first single mode fiber, an end of the first single mode fiber has a fiber cantilever beam structure which is formed by a fiber Bragg grating, a second single mode fiber, a fiber capillary and a third single mode fiberwhich are sequentially connected, and a Fabry-Perot interference cavity is formed by the fiber capillary and the third single mode fiber. The micro-nano fiber grating two-dimensional vibration sensorprovided by the invention can simultaneously detect the frequency, intensity and direction of vibration and has the advantages of simple manufacturing and compact structure, the sensor has the traditional advantages of an optical fiber sensor and has the advantages of high sensitivity, small volume, electromagnetic interference resistance, no power supply and easy networking, and the disadvantagesof an electronic sensor are made up.

Micro-nano fiber grating two-dimensional vibration sensor integrated with microbubbles at end and manufacturing method thereof

The invention relates to a device for restraining the wind noise of a microphone. The device comprises a nose cone, a turbulence shielding cylinder in a cylindrical structure and a diversion cap, wherein the head and tail ends of the turbulence shielding cylinder are respectively and concentrically connected with the nose cone and the diversion cap, the outer diameter of the turbulence shielding cylinder and the diameter of a cone base of the nose cone are consistent with the diameter of the bottom of the diversion cap, and the nose cone, the turbulence shielding cylinder and the diversion cap have smooth outer surfaces, and the outer shapes of the nose cone and the diversion cap are in streamline structures. According to the device provided by the invention, because the air noise streamline structure is formed to reduce air current by the nose cone and the diversion cap, and the outer surfaces of the nose cone, the turbulence shielding cylinder and the diversion cap are smooth, and noise caused by the interaction of air current and a sensor structure can be reduced at high air speed, so as to improve the measuring precision of the sensor at high air speed.

Device for restraining wind noise of microphone

The invention relates to an optical fiber microphone and a sensitive structure and a preparation method thereof, a bridge opening structure is formed on a silicon substrate, a sensitive vibrating diaphragm and a breathable baffle plate are arranged above the bridge opening structure, the sensitive vibrating diaphragm is located above the breathable baffle plate, and the sensitive vibrating diaphragm and the breathable baffle plate are arranged in parallel. Adjustment of diaphragm pressing damping of the microphone vibration system can be realized through the breathable baffle plate so that thehigh-frequency vibration characteristic of the sensitive diaphragm can be changed through adjustment of the damping, the upper limit of the working frequency of the microphone can be effectively enhanced, and the problem that the existing optical fiber microphone cannot simultaneously realize high sensitivity and wider frequency response range can be solved.

Optical fiber microphone and sensitive structure and preparation method thereof

The invention discloses a graphene corrugated film optical fiber F-P (Fabry-Perot) sound pressure sensor and a manufacturing method thereof. The graphene corrugated film optical fiber F-P (Fabry-Perot) sound pressure sensor comprises a single-mode optical fiber (1), an optical fiber insertion core (2) and a graphene corrugated film (3). According to the sound pressure sensor, the corrugated graphene film is used as a pressure sensitive unit, the single-mode optical fiber is used for conducting laser, and on the basis of the optical fiber F-P interference principle, high-sensitivity detection of film deflection deformation is achieved. Compared with a traditional round flat membrane, the graphene corrugated film has a corrugated structure, and due to release of internal stress of the film,the pressure-deflection characteristic of the film can be effectively improved. The sound pressure sensor has the advantages of being simple in structure, small in size, high in sensitivity, resistantto electromagnetic interference and the like, and has important research significance and application value in the acoustic detection fields of aerospace, noise measurement, voice interaction and thelike.

Graphene corrugated film optical fiber F-P sound pressure sensor and manufacturing method thereof

The embodiment of the invention provides an optical fiber microphone probe and an optical fiber microphone system. A diaphragm made of a composition containing SiO2 is adopted, and the diaphragm adopts a corrugated structure, the stress of the diaphragm is released, the elastic coefficient of the diaphragm is increased, the sensitivity is improved and the frequency response range is expanded underthe premise that the resonant frequency is not reduced, and the problem that an existing optical fiber microphone probe cannot simultaneously achieve higher sensitivity and wider frequency responsescan be solved.

Optical fiber microphone probe and optical fiber microphone system

The utility mode relates to an apparatus used for suppressing wind noise for a microphone. The apparatus comprises a nose cone, a cylindrical turbulent flow shielding cylinder and a diversion cap. The head and the tail of the turbulent flow shielding cylinder are respectively coaxially connected with the nose cone and the diversion cap, the external diameter of the turbulent flow shielding cylinder is the same as the diameter of the bottom of the nose cone and the diameter of the bottom of the diversion cap, the nose cone, the turbulent flow shielding cylinder and the division cap have smooth outer surfaces, and the outer shapes of the nose cone and the diversion cap are streamline. Because the nose cone and the diversion cap have streamline structures capable of reducing wind noise generated by air flow, and the outer surfaces of the nose cone, the turbulent flow shielding cylinder and the division cap are smooth, so noise produced by interaction of air flow and a microphone can be reduced at a high wind speed situation, the measuring precision of the microphone at a high wind speed can be raised.

Apparatus used for suppressing wind noise for microphone

The invention provides a non-diaphragm fiber laser microphone. The non-diaphragm fiber laser microphone comprises a pumping source, a wavelength division multiplexer, a fiber Bragg grating, a doped fiber, a Fabry-Perot etalon and an output fiber; an output end of the pumping source is connected with a first port of the wavelength division multiplexer; a second port of the wavelength division multiplexer is orderly connected with the fiber Bragg grating, the doped fiber and the Fabry-Perot etalon; and a third port of the wavelength division multiplexer is connected with the output fiber. The non-diaphragm fiber laser microphone adopts a fiber laser resonator to control the temperature coefficient of the fiber Bragg grating and the Fabry-Perot etalon to be the same, so that the center wavelength of the fiber Bragg grating and the resonant wavelength of the Fabry-Perot etalon maintain the collaborative drift along with temperature changes, and the sensitivity of the fiber laser microphoneis kept invariable; in addition, the non-diaphragm fiber laser microphone has the advantages of being simple in structure, good in stability, and wide in frequency response range, and is suitable forvoice communication and sound detection and other fields.

Non-diaphragm fiber laser microphone

The invention provides an optical fiber microphone array system, which comprises a transmitting module, an optical fiber microphone probe, a receiving module and a signal demodulating module, whereina first wavelength division multiplexer is arranged in the transmitting module, a third wavelength division multiplexer is arranged in the receiving module, and a second wavelength division multiplexer is arranged between the transmitting module and the fiber microphone probe array; based on a time division wavelength division hybrid multiplexing technology, the sensitivity of the optical fiber microphone array is improved, the transmission loss is reduced, and the anti-electromagnetic interference capability is improved; and the problems of low sensitivity, large signal transmission loss andpoor anti-electromagnetic interference resistance in an existing microphone array are solved.

Optical fiber microphone array system

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