WO2007015324A1 - Élément de microphone - Google Patents

Élément de microphone Download PDF

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Publication number
WO2007015324A1
WO2007015324A1 PCT/JP2006/309013 JP2006309013W WO2007015324A1 WO 2007015324 A1 WO2007015324 A1 WO 2007015324A1 JP 2006309013 W JP2006309013 W JP 2006309013W WO 2007015324 A1 WO2007015324 A1 WO 2007015324A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
light
core
sensor
microphone element
Prior art date
Application number
PCT/JP2006/309013
Other languages
English (en)
Japanese (ja)
Inventor
Kazuhiro Watanabe
Hiroyuki Sasaki
Original Assignee
Tama-Tlo, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tama-Tlo, Ltd. filed Critical Tama-Tlo, Ltd.
Publication of WO2007015324A1 publication Critical patent/WO2007015324A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
    • G01H9/006—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors the vibrations causing a variation in the relative position of the end of a fibre and another element
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00

Definitions

  • the present invention relates to a microphone element, and more particularly to a microphone element using an optical fiber sensor.
  • Optical fibers have been widely used as means for transmitting signals, and sensors using optical fibers have been developed for various purposes in various systems.
  • Japanese Unexamined Patent Application Publication No. 2002-232999 describes an optical fiber loop interferometer type acoustic sensor and an acoustic detection method.
  • a loop-shaped optical fiber that is passed through a diaphragm that vibrates with an acoustic signal.Converts vibrations transmitted to the diaphragm to electrical signals from changes in the intensity of interference light obtained by propagating light clockwise and counterclockwise through the fiber. It is.
  • Japanese Unexamined Patent Application Publication No. 2000-65633 describes an optical waveguide vibration sensor system for remote detection.
  • the mechanical signal transmitted to the geophone from the interference pattern obtained by modulating the phase of the optical signal guided into the optical waveguide is converted into an electrical signal by the electrical signal generated by the geophone.
  • Japanese Patent Application Laid-Open No. 11 252696 describes a structure of a light modulation microphone.
  • the light emitting / receiving section that accommodates the light emitting element and the light receiving element separated from each other by the partition and the optical waveguide that transmits light from the light receiving / emitting section are formed separately and integrated with the thin film diaphragm.
  • the light of the light emitting part is reflected by the thin film diaphragm and received by the light receiving part.
  • the intensity of the light received by the light receiving part is modulated and converted into an electrical signal. It is.
  • the acoustic sensor described in Japanese Patent Laid-Open No. 2002-232999 is complicated as a whole device, and moreover, the device for detecting the interference light is expensive, so that it can be used as an acoustic sensor. There is a problem that becomes price.
  • the optical waveguide vibration sensor system described in Japanese Patent Application Laid-Open No. 2000-65633 has a problem that the entire apparatus is complicated and the optical waveguide vibration sensor system becomes expensive.
  • the microphone described in Japanese Patent Application Laid-Open No. 11-252696 has a problem in that a precise design is required and the manufacturing cost increases.
  • a problem to be solved is that, in a microphone using an optical fiber sensor, it is difficult to reduce the manufacturing cost as a simple structure.
  • the microphone element of the present invention includes a vibration sheet that captures vibration of a medium, a core provided on the vibration sheet, and a clad provided on an outer periphery of the core, and a part of the external environment of the transmitted light.
  • An optical fiber having a sensor unit that enables interaction with the optical fiber, a light source that emits light to the incident end of the optical fiber, and the light emitted from the output end of the optical fiber via the sensor unit And a light receiving portion for detecting light.
  • an optical fiber is provided on a vibration sheet that captures vibrations of a medium.
  • the optical fiber includes a core and a clad provided on the outer periphery of the core, and has a sensor unit that enables interaction with a part of the transmitted light.
  • a light source that emits light to the incident end of the optical fiber and a light receiving unit that detects light emitted from the output end force of the optical fiber via the sensor unit are provided.
  • the sensor unit includes the optical fiber.
  • This is a hetero core part having a core diameter different from the core diameter of the bar, and is configured to be joined to the middle part of the optical fiber.
  • the sensor unit is configured such that a light transmitting member having a refractive index equivalent to a refractive index of the core of the optical fiber or a refractive index of the cladding is joined to a middle part of the optical fiber. It is.
  • the optical fiber is preferably provided on the vibration sheet so that the optical fiber is bent with the sensor portion as a top portion.
  • the optical fiber including the sensor portion is linearly provided on the vibration sheet.
  • the optical fiber is bonded to the vibration sheet.
  • the optical fiber is embedded in the vibration sheet.
  • the microphone element of the present invention is a microphone using an optical fiber sensor, has a simple structure, and can be manufactured at low cost.
  • FIG. 1 is a schematic configuration diagram of a microphone element according to a first embodiment of the present invention.
  • FIG. 2A and FIG. 2B are graphs showing the intensity of incident light and emitted light of the microphone device according to the first embodiment of the present invention.
  • FIG. 3A is a perspective view of the optical fiber in the vicinity of the sensor part SP for showing an example of the configuration of the sensor part
  • FIG. 3B is a longitudinal sectional view in the vicinity of the sensor part.
  • FIG. 4A and FIG. 4B are cross-sectional views in the longitudinal direction in the vicinity of the sensor portion of the optical fiber, for illustrating an example of the configuration of the sensor portion.
  • FIG. 5 is a schematic configuration diagram of a main part of a microphone element according to a second embodiment of the present invention.
  • FIG. 1 is a schematic configuration diagram of a microphone element according to this embodiment.
  • optical fibers (20a, 20b) are provided by being attached to or embedded in a vibration sheet 13 that captures the vibration of the medium.
  • the vibration sheet 13 can capture vibrations transmitted to a medium on which the resin sheet 13 such as air or water is placed, for example, a resin sheet or paper, and transmit the vibrations to the optical fiber (20a, 20b). Any material can be used.
  • the optical fiber (20a, 20b) has a configuration including a core and a cladding provided on the outer periphery of the core.
  • the optical fiber 20a and the optical fiber 20b are configured to transmit light transmitted through the optical fiber (20a, 20b). It is connected by a sensor part SP that enables interaction with some external worlds.
  • the optical fibers (20a, 20b) are provided so as to be bent with the sensor part SP as the top.
  • the light is emitted from the light source 14 such as a laser diode or a light emitting diode that emits light to the incident end of the optical fiber (20a, 20b) and the light emitting end of the optical fiber (20a, 20b) via the sensor unit SP.
  • a light receiving unit 15 such as a photodiode for detecting light is provided.
  • sensor light of 14 light sources is transmitted and received by the light receiving unit 15.
  • the degree of interaction with the external environment changes corresponding to the transmitted vibration, and the intensity of the transmitted light changes.
  • the intensity of the electrical signal obtained by receiving the output light from the optical fiber (20a, 20b) at the light receiving unit 15 is modulated in response to the vibration of the medium. In this way, the vibration is converted into an electrical signal. And function as a microphone.
  • the output of the light receiving unit 15 can be amplified by the amplifier 16 and output from the speaker 17 as sound.
  • FIGS. 2A and 2B are graphs showing the intensity of incident light from the light source 14 of the microphone element and the intensity of outgoing light received by the light receiving unit 15, respectively.
  • the intensity of the emitted light is modulated in accordance with the vibration transmitted to the vibration sheet.
  • FIG. 3A is a perspective view of the optical fiber (20a, 20b) in the vicinity of the sensor portion SP to show an example of the configuration of the sensor portion SP
  • FIG. 3B is a longitudinal sectional view in the vicinity of the sensor portion SP. It is.
  • the optical fiber (20a, 20b) constituting the microphone element is a single mode fiber having a core diameter of 9 / zm, for example, and the optical fiber 20a and the optical fiber 20b are transmitted through the optical fiber (20a, 20b). It is connected by the sensor part SP that enables interaction with a part of the outside of the light to be transmitted.
  • the optical fibers (20a, 20b) have a core 21 and a clad 22 provided on the outer periphery thereof.
  • the light from the light source 14 is also incident on the core 21 at the light incident end side force, and is emitted from the core 21 on the light emitting end side to the light receiving unit via the sensor unit SP.
  • the sensor part SP shown in FIGS. 3A and 3B is a hetero-core part 3 having a core diameter different from the core diameter of the optical fiber (20a, 20b), and includes a core 31 and a clad 32 provided on the outer periphery thereof. And have.
  • the optical core (3) constituting the optical fiber (20a, 20b) and the sensor part SP is almost coaxial so that the cores are joined at the interface 4 perpendicular to the longitudinal direction. Etc. are joined together.
  • the diameter bl of the core 31 in the hetero-core part 3 and the optical fiber (2 Oa , 20b) is different from the diameter al of the core 21 at the interface 4, and a part of the light leaks into the cladding 32 of the hetero-core part 3 due to the difference in the core diameter.
  • FIGS. 4A and 4B are cross-sectional views in the longitudinal direction of the optical fiber (20a, 20b) in the vicinity of the sensor part SP for illustrating an example of the configuration of the sensor part SP.
  • the diameter bl of the core 31 of the hetero-core part 3 constituting the sensor part SP is larger than the diameter aU of the core 21 of the optical fiber (20a, 20b).
  • the sensor portion SP is a light transmitting member having a refractive index equivalent to the refractive index of the core 21 or the refractive index of the cladding 22 of the optical fiber (20a, 20b). Can be made to be joined to the middle part of the optical fiber (20a, 20b).
  • a plurality of force members that connect one sensor part SP to the middle part of the optical fiber (20a, 20b) may be connected in series.
  • a plurality of optical fibers each provided with a sensor unit are provided on the same vibration sheet. You may choose.
  • the microphone element includes a vibration sheet that captures vibration of a medium, a vibration sheet that is provided on the vibration sheet, and a core and a cladding that is provided on the outer periphery of the core.
  • An optical fiber having a sensor unit that enables interaction with a part of the outside of the optical fiber, a light source that emits light to the incident end of the optical fiber, and an optical fiber exiting from the output end of the optical fiber And a light receiving unit that detects light.
  • the microphone element of the present embodiment is a microphone that uses an optical fiber sensor, has a simple structure, and can be manufactured at low cost.
  • the microphone element according to this embodiment is substantially the same as that of the first embodiment, but the arrangement of the optical fibers is different.
  • FIG. 5 is a schematic configuration diagram of a main part of the microphone element according to the present embodiment.
  • the optical fiber (20a, 20b) including the sensor part SP in the middle is provided on the vibration sheet 13 in a straight line.
  • the microphone element of the present embodiment is a microphone that uses an optical fiber sensor, is a simple structure, and can be manufactured at low cost. Therefore, it is easy to use remotely, and electromagnetic induction does not occur in the sensor part, so it can be used in places where EMI interference is a concern.
  • the vibration sheet and optical fiber parts that detect vibration do not use electricity, they can be used in water or in places where there is a risk of fire.
  • the microphone element of the above-described embodiment is arranged in a liquid consisting of only a gas such as air as a medium on which the microphone element is placed, and captures vibrations transmitted in the liquid and converts them into electrical signals. It is also possible.
  • any form of vibration that can be transmitted to the optical fiber can be converted into an electrical signal. Therefore, the vibration sheet or the optical fiber is brought into contact with a vibrating object such as an automobile engine to generate the electrical signal. It can also be used as a vibration sensor to convert to, and it can also be used as an aerospace related vibration sensor. It can also be used as a security sensor for crime prevention by detecting vibrations generated by intruders in the monitoring area as electrical signals.
  • the vibration sheet has a flat sheet shape, but is not limited thereto, and may have various shapes.
  • various materials such as a resin sheet and paper can be used.
  • a light emitting element other than a semiconductor light emitting element such as a laser diode or a light emitting diode can be used.
  • any element that converts light into an electrical signal can be used in addition to a photodiode.
  • the microphone element of the present invention can be applied to a microphone or a vibration sensor that converts vibration transmitted to a medium such as air or water into an electric signal.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

Élément de microphone utilisant un capteur à fibre optique, présentant une structure simple diminuant les coûts de production. Une fibre optique (29a, 20b) est disposée sur une feuille de vibrations (13) pour capter les vibrations d’un medium. La fibre optique (20a, 20b) comporte un cœur et un revêtement disposé autour de la périphérie externe du cœur, un capteur (SP) permettant à une partie de la lumière transmise d’interagir avec l'environnement, et une source de lumière (14) servant à émettre de la lumière vers une extrémité d’entrée de la fibre optique (20a, 20b) et une section de réception de lumière (15) servant à détecter, via la section de capteur (SP), la lumière émise d’une extrémité de sortie de la fibre optique (20a, 20b).
PCT/JP2006/309013 2005-08-01 2006-04-28 Élément de microphone WO2007015324A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005222796A JP2007043291A (ja) 2005-08-01 2005-08-01 マイクロフォン素子
JP2005-222796 2005-08-01

Publications (1)

Publication Number Publication Date
WO2007015324A1 true WO2007015324A1 (fr) 2007-02-08

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ID=37708607

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/309013 WO2007015324A1 (fr) 2005-08-01 2006-04-28 Élément de microphone

Country Status (3)

Country Link
JP (1) JP2007043291A (fr)
KR (1) KR20080031477A (fr)
WO (1) WO2007015324A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103925985A (zh) * 2014-04-10 2014-07-16 华中科技大学 一种基于无芯光纤的振动传感器及其检测装置
CN106248194A (zh) * 2016-07-22 2016-12-21 华中科技大学 一种基于无芯光纤的振动测量装置
JP2017528661A (ja) * 2014-08-22 2017-09-28 プレジデント アンド フェローズ オブ ハーバード カレッジ 可撓性と伸縮性を有するソフトアクチュエータ用電子歪制限層
CN107402063A (zh) * 2017-09-26 2017-11-28 河南科技大学 一种采集移栽机振动信号的捕捉装置及其捕捉信号的方法
US10576643B2 (en) 2014-08-22 2020-03-03 President And Fellows Of Harvard College Sensors for soft robots and soft actuators

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5009144B2 (ja) * 2007-12-18 2012-08-22 日本電信電話株式会社 浸水検知モジュールとその浸水検知方法
JP2011033411A (ja) * 2009-07-30 2011-02-17 Soka Univ 傾斜角度計測素子、傾斜計
US11736867B2 (en) * 2021-01-20 2023-08-22 Nec Corporation Active microphone for increased DAS acoustic sensing capability

Citations (6)

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Publication number Priority date Publication date Assignee Title
JPS61151485A (ja) * 1984-12-25 1986-07-10 Nec Corp 光フアイバハイドロホン
JPS63158048A (ja) * 1986-12-22 1988-07-01 株式会社日立製作所 核磁気共鳴装置における通話方法
JPH06241885A (ja) * 1993-02-17 1994-09-02 Toshiba Corp 超音波測定用ハイドロホン
JP3180959B2 (ja) * 1996-06-21 2001-07-03 株式会社インターアクション センサ用光ファイバおよびセンサシステム
JP2002243537A (ja) * 2001-02-09 2002-08-28 Kenwood Corp 振動検出装置
JP2003329581A (ja) * 2002-05-15 2003-11-19 Tama Tlo Kk 光ファイバ型多波長分光測定装置および光ファイバを用いた多波長分光測定方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61151485A (ja) * 1984-12-25 1986-07-10 Nec Corp 光フアイバハイドロホン
JPS63158048A (ja) * 1986-12-22 1988-07-01 株式会社日立製作所 核磁気共鳴装置における通話方法
JPH06241885A (ja) * 1993-02-17 1994-09-02 Toshiba Corp 超音波測定用ハイドロホン
JP3180959B2 (ja) * 1996-06-21 2001-07-03 株式会社インターアクション センサ用光ファイバおよびセンサシステム
JP2002243537A (ja) * 2001-02-09 2002-08-28 Kenwood Corp 振動検出装置
JP2003329581A (ja) * 2002-05-15 2003-11-19 Tama Tlo Kk 光ファイバ型多波長分光測定装置および光ファイバを用いた多波長分光測定方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103925985A (zh) * 2014-04-10 2014-07-16 华中科技大学 一种基于无芯光纤的振动传感器及其检测装置
JP2017528661A (ja) * 2014-08-22 2017-09-28 プレジデント アンド フェローズ オブ ハーバード カレッジ 可撓性と伸縮性を有するソフトアクチュエータ用電子歪制限層
US10576643B2 (en) 2014-08-22 2020-03-03 President And Fellows Of Harvard College Sensors for soft robots and soft actuators
US10792807B2 (en) 2014-08-22 2020-10-06 President And Fellows Of Harvard College Flexible and stretchable electronic strain-limited layer for soft actuators
CN106248194A (zh) * 2016-07-22 2016-12-21 华中科技大学 一种基于无芯光纤的振动测量装置
CN107402063A (zh) * 2017-09-26 2017-11-28 河南科技大学 一种采集移栽机振动信号的捕捉装置及其捕捉信号的方法
CN107402063B (zh) * 2017-09-26 2023-09-19 河南科技大学 一种采集移栽机振动信号的捕捉装置及其捕捉信号的方法

Also Published As

Publication number Publication date
KR20080031477A (ko) 2008-04-08
JP2007043291A (ja) 2007-02-15

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