JPH035875Y2 - - Google Patents
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- Publication number
- JPH035875Y2 JPH035875Y2 JP12536584U JP12536584U JPH035875Y2 JP H035875 Y2 JPH035875 Y2 JP H035875Y2 JP 12536584 U JP12536584 U JP 12536584U JP 12536584 U JP12536584 U JP 12536584U JP H035875 Y2 JPH035875 Y2 JP H035875Y2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- rigid cylinder
- cylinder
- optical
- same
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
- 239000013307 optical fiber Substances 0.000 claims description 65
- 239000007788 liquid Substances 0.000 claims description 12
- 239000011810 insulating material Substances 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は光フアイバを用いて水中の音響信号を
検出する光フアイバハイドロホンに関するもので
ある。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an optical fiber hydrophone that detects underwater acoustic signals using optical fibers.
（従来の技術）
Γ 菊池、高橋、「光フアイバを用いた水中音波
の検出法」、日本音響学会誌40巻２号101−
106（1984）
Γ 同上「光フアイバを用いた水中音波の検出法
」、日本音響学会誌40巻３号175−180（1984）
例えば上記文献に記載されている様に、光フア
イバを用いた音響信号の検出法には光フアイバ自
身をセンサとする光干渉法と、光フアイバは伝送
路とし、光音響センサを用いた光強度変調法とに
大別される。(Prior art) Γ Kikuchi, Takahashi, "Detection method of underwater sound waves using optical fiber", Journal of the Acoustical Society of Japan, Vol. 40, No. 2, 101-
106 (1984) Γ ``Detection method of underwater sound waves using optical fibers'', Journal of the Acoustical Society of Japan, Vol. 40, No. 3, 175-180 (1984) For example, as described in the above document, Signal detection methods are broadly divided into optical interference methods, which use the optical fiber itself as a sensor, and optical intensity modulation methods, which use the optical fiber as a transmission path and use photoacoustic sensors.
（考案が解決しようとする問題点）
現在、上記文献に報告されているものは、いず
れもその動作原理のみを示したものであつて、実
用上重要な事項、すなわち温度変動やケーブルの
振動、光源変動などによる出力への影響を考慮し
た具体的な光フアイバハイドロホンの構造につい
ては何ら示されていなかつた。(Problems to be solved by the invention) Currently, all of the above-mentioned documents present only the principle of operation, and do not address important matters in practical terms, such as temperature fluctuations, cable vibrations, etc. No specific structure of an optical fiber hydrophone that takes into account the influence of light source fluctuations on the output has been presented.
本考案は上述の問題点に鑑み、新規な構造の光
フアイバハイドロホンを提供するものである。 In view of the above-mentioned problems, the present invention provides an optical fiber hydrophone with a novel structure.
（問題点を解決するための手段）
本考案は両端面に半透膜１２，１３，２２，２
３を有する２組の同質、同長の光フアイバ１１，
２１のうち、光フアイバ１１の一部を外部円筒３
９の外周に巻付けてセンサ部とし、該外部円筒３
９の内部表面を遮音材３８で遮音し、他方の光フ
アイバ２１の一部を前記センサ部とした光フアイ
バ１１と同長だけ前記外部円筒３９より十分小さ
い内部円筒４２の外周に巻付け、前記外部円筒３
９の内部に前記内部円筒４２を固定し、前記外部
円筒３９の両端を閉じて該外部円筒３９に複数個
の小孔４０ａ，４０ｂを設け、外部円筒３９、内
部円筒４２を同一の液体で満たしながら円筒形ゴ
ム容器３５に封止した構造を特徴とする光フアイ
バハイドロホンである。(Means for solving the problem) The present invention has semipermeable membranes 12, 13, 22, 2 on both end faces.
3, two sets of optical fibers 11 of the same quality and length;
21, a part of the optical fiber 11 is connected to the external cylinder 3.
9 to form a sensor section, and the external cylinder 3
9 is insulated from sound by a sound insulating material 38, and a part of the other optical fiber 21 is wrapped around the outer periphery of the inner cylinder 42, which is sufficiently smaller than the outer cylinder 39, by the same length as the optical fiber 11 used as the sensor section. external cylinder 3
The inner cylinder 42 is fixed inside the inner cylinder 9, both ends of the outer cylinder 39 are closed, a plurality of small holes 40a, 40b are provided in the outer cylinder 39, and the outer cylinder 39 and the inner cylinder 42 are filled with the same liquid. However, it is an optical fiber hydrophone characterized by a structure in which it is sealed in a cylindrical rubber container 35.
（作用）
上述の手段の作用を説明する。本考案は光フア
イバを用いて水中の音響信号を検出する光フアイ
バハイドロホンに関するものであり、測定する音
場から隔離され、基準となるビームを通す光フア
イバ２１と音場に晒される光フアイバ１１の各々
の干渉出力の差を測定する方式をとつている。(Operation) The operation of the above-mentioned means will be explained. The present invention relates to an optical fiber hydrophone that detects acoustic signals underwater using optical fibers, and includes an optical fiber 21 that is isolated from the sound field to be measured and passes a reference beam, and an optical fiber 11 that is exposed to the sound field. A method is used to measure the difference in the interference output of each.
従つて、光フアイバ１１の一部を外部円筒３９
に巻付け、さらに外部円筒３９より十分小さい内
部円筒４２に光フアイバ２１の一部を前記光フア
イバ１１と同長だけ巻き付け、遮音材３８で前記
外部円筒３９の内部表面を遮音し、前記内部円筒
４２を外部円筒３９の内部に固定し、前記外部円
筒３９の両端を閉じた構造により、光フアイバ２
１を音響的に遮断できるとともに、コンパクトな
構造とすることができる。 Therefore, a part of the optical fiber 11 is inserted into the outer cylinder 39.
Further, a part of the optical fiber 21 is wound around the inner cylinder 42 which is sufficiently smaller than the outer cylinder 39 by the same length as the optical fiber 11, and the inner surface of the outer cylinder 39 is sound-insulated with the sound insulating material 38, and the inner cylinder 42 is sufficiently smaller than the outer cylinder 39. 42 is fixed inside the outer cylinder 39, and both ends of the outer cylinder 39 are closed.
1 can be acoustically isolated and can have a compact structure.
さらに前記外部円筒３９に複数個の小孔４０
ａ，４０ｂを設け、外部円筒３９と内部円筒４２
を同一の液体で満たしながら円筒形ゴム容器３５
に封止した構造とすることにより、光フアイバ１
１は音波を受信でき、光フアイバ２１は音響的に
遮断できるとともに両方をほぼ同一の温度とする
ことができ、光フアイバ１１と光フアイバ２１の
温度差による干渉出力の変動等を打消すことがで
きる。 Furthermore, a plurality of small holes 40 are formed in the external cylinder 39.
a, 40b are provided, and an outer cylinder 39 and an inner cylinder 42 are provided.
The cylindrical rubber container 35 is filled with the same liquid.
By creating a structure in which the optical fiber 1
The optical fiber 1 can receive sound waves, and the optical fiber 21 can acoustically block them and keep both at almost the same temperature, making it possible to cancel out fluctuations in interference output due to temperature differences between the optical fibers 11 and 21. can.
（実施例）
次に実施例を用いて、本考案の動作原理、構
成、効果を詳細に説明する。(Example) Next, the operating principle, configuration, and effects of the present invention will be explained in detail using examples.
第２図は本考案の実施例の動作原理を説明する
ためのブロツク図であつて、レーザー発振器１か
ら発射された光ビーム２はビーム拡大器３で拡大
される。拡大されたビーム４はハーフミラー５で
２つの径路光６，７に分かれ、レンズ８，９で集
光し、伝送用光フアイバ１０，２０の内部に入射
する。 FIG. 2 is a block diagram for explaining the operating principle of the embodiment of the present invention, in which a light beam 2 emitted from a laser oscillator 1 is expanded by a beam expander 3. The expanded beam 4 is split into two path lights 6 and 7 by a half mirror 5, condensed by lenses 8 and 9, and incident on the inside of transmission optical fibers 10 and 20.
光フアイバ１０，２０の両端面には半透膜１
２，１３、及び２２，２３が蒸着されているの
で、入射した光は多重反射をくり返し、そのうち
の一部が半透膜１３，２３を通つて透過する。そ
の透過光を伝送用光フアイバ１６，２６に入射さ
せて伝送し、光検出器１７，２７で光の強度を検
出し、増幅器１８，２８で増幅する。 A semi-permeable membrane 1 is provided on both end surfaces of the optical fibers 10 and 20.
2 and 13 and 22 and 23 are vapor-deposited, the incident light undergoes multiple reflections, and some of the reflections are transmitted through the semi-transparent films 13 and 23. The transmitted light enters transmission optical fibers 16 and 26 and is transmitted, the intensity of the light is detected by photodetectors 17 and 27, and amplified by amplifiers 18 and 28.
光検出器１７，２７の出力はフアブリーペロー
の干渉計の原理に従つて、両端に半透膜を有する
光フアイバ１１，２１の長さをｌ、半透膜の反射
係数をｋ、光の波長をλ、多重反射の回数をｎと
した時、次式の干渉出力Ｉに比例する。 The outputs of the photodetectors 17 and 27 are determined according to the principle of Fabry-Perot's interferometer, where the length of the optical fibers 11 and 21 having a semi-transparent film at both ends is l, the reflection coefficient of the semi-transparent film is k, and the wavelength of the light is When λ and the number of multiple reflections are n, it is proportional to the interference output I of the following equation.
Ｉ＝１／１＋Ksin2β ……（１−１）
Ｋ＝4K／１−K2 ……（１−２）
β＝2πnl／λ ……（１−３）
（１−１）式の干渉出力Ｉは、第３図の曲線３
２に示すような特性を示し、（１−３）式のβが
πの整数倍毎に極大値を有するので、波長λを変
化させるか、光フアイバ１１，２１の長さｌを変
化させ、出力Ｉを調節する。 I=1/1+Ksin 2 β...(1-1) K=4K/1-K 2 ...(1-2) β=2πnl/λ...(1-3) Interference output of equation (1-1) I is curve 3 in Figure 3.
2, and β in equation (1-3) has a maximum value at every integer multiple of π, so by changing the wavelength λ or changing the length l of the optical fibers 11 and 21, Adjust output I.
光フアイバの長さを調節する方法の一例とし
て、光フアイバを圧電体１５，２５に巻付け、音
響信号がないときに夫々の出力Ｉが第３図の点線
３３で示すよようにI0となり、かつ２つの光学系
の出力が同じ値を示すように、圧電体１５，２５
に制御電源１９，２９から夫々直流電源を印加し
圧電体１５，２５の伸縮に応じて光フアイバの長
さを調節する例を示した。 As an example of a method of adjusting the length of the optical fiber, the optical fiber is wound around the piezoelectric bodies 15 and 25 so that when there is no acoustic signal, the output I of each becomes I 0 as shown by the dotted line 33 in FIG. , and the piezoelectric bodies 15 and 25 are arranged so that the outputs of the two optical systems show the same value.
An example is shown in which DC power is applied from the control power supplies 19 and 29, respectively, and the length of the optical fiber is adjusted according to the expansion and contraction of the piezoelectric bodies 15 and 25.
この様な状態で光フアイバ１１の一部を音場に
晒し、他方の光フアイバを遮音し、破線１４で囲
んだ範囲内の光フアイバを音響センサ部とすれ
ば、音響信号により光フアイバ１１の長さと屈折
率が変化するので干渉出力Ｉは音響信号により変
化する。 In this state, if a part of the optical fiber 11 is exposed to a sound field, the other optical fiber is sound-insulated, and the optical fiber within the range surrounded by the broken line 14 is used as an acoustic sensor section, the optical fiber 11 can be detected by an acoustic signal. Since the length and refractive index vary, the interference power I varies with the acoustic signal.
そして、音場に晒されない方の出力は一定であ
るので２つの増幅部１８，２８の出力の差を処理
回路３０で求め、表示器３１で表示すると、音響
信号の強さに対応した出力が求められる。なお、
２つの光学系、すなわち同質、同長の光フアイバ
を並列して設ける事により、温度や伝送用光フア
イバの振動による光強度の変化は２つの光学系で
同一となるので、その出力差を求めることによ
り、温度、振動による光強度の変動を消去でき
る。また、レーザ光源１の出力をハーフミラー５
で２つに分けて用いているため、光源の変動によ
る出力の変動も２つの光学系の差を求めることに
より消去できるのである。 Since the output of the one not exposed to the sound field is constant, the processing circuit 30 calculates the difference between the outputs of the two amplification sections 18 and 28, and displays it on the display 31, which shows the output corresponding to the strength of the acoustic signal. Desired. In addition,
By installing two optical systems, that is, optical fibers of the same quality and length in parallel, changes in light intensity due to temperature and vibration of the transmission optical fiber will be the same in the two optical systems, so find the difference in output. By doing so, fluctuations in light intensity due to temperature and vibration can be eliminated. In addition, the output of the laser light source 1 is transferred to the half mirror 5.
Since the optical system is divided into two parts, fluctuations in output due to fluctuations in the light source can be eliminated by finding the difference between the two optical systems.
次に本考案の実施例の構成を説明する。 Next, the configuration of an embodiment of the present invention will be explained.
第１図は本考案の実施例の断面図であり、第２
図の一点鎖線３４内の構造を示すものである。 FIG. 1 is a sectional view of an embodiment of the present invention;
This shows the structure within the dashed line 34 in the figure.
光フアイバ１１は、内部表面を遮音材３８で内
貼し、一方の口を閉じた外部円筒３９の外周に巻
付けられ、さらにその一方を圧電体１５に巻付け
られた後、接続器４３ａ，４３ｂを用いて伝送用
光フアイバ１０，１６に接続される。そして光フ
アイバ２１は前記光フアイバ１１と同長だけ内部
円筒４２の外周に巻付けられ、さらにその一方を
圧電体２５に巻付けられた後、接続器４３ｂ，４
４ａを用いて伝送用光フアイバ２０，２６に接続
される。伝送用光フアイバ１０，２０，１６，２
６、及び前記圧電体１５，２５を駆動するための
圧電体駆動用ケーブル４５ａ，４５ｂはケーブル
４７に一体化され、耐水圧容器３６から引出さ
れ、防水部４６で固定される。 The optical fiber 11 is wrapped around the outer periphery of an external cylinder 39 whose inner surface is lined with a sound insulating material 38 and one end of which is closed.The optical fiber 11 is further wound around the piezoelectric body 15 on one side, and then connected to the connector 43a, 43b to the transmission optical fibers 10 and 16. The optical fiber 21 is wound around the outer periphery of the inner cylinder 42 by the same length as the optical fiber 11, and one end of the optical fiber 21 is wound around the piezoelectric body 25, and then the connectors 43b and 43
4a to the transmission optical fibers 20 and 26. Transmission optical fiber 10, 20, 16, 2
6 and piezoelectric body drive cables 45a and 45b for driving the piezoelectric bodies 15 and 25 are integrated into a cable 47, pulled out from the water pressure container 36, and fixed with a waterproof portion 46.
そして内部円筒４２は外部円筒３９の内部に設
置され、さらに外部円筒３９は前記耐水圧容器と
接合された円筒形ゴム容器３５内に設置される
が、その際、外部円筒３９には複数個の小孔４０
ａ，４０ｂが設けられ、室３７、及び内側の室４
１が同一の液体で満されるように前記円筒形ゴム
容器３５に封止される。 The inner cylinder 42 is installed inside the outer cylinder 39, and the outer cylinder 39 is further installed inside the cylindrical rubber container 35 joined to the water pressure container. Small hole 40
a, 40b are provided, a chamber 37, and an inner chamber 4.
1 is sealed in the cylindrical rubber container 35 so that it is filled with the same liquid.
この液体としては、例えばヒマシ油の様に粘度
の低い、不揮発性の液体が用いられるが、望まし
くはこの光フアイバハイドロホンの用いられる環
境に適した、例えば海水に等しい音響インピーダ
ンスを有する液体が良い。 As this liquid, a non-volatile liquid with low viscosity, such as castor oil, is used, but preferably a liquid that is suitable for the environment in which this optical fiber hydrophone is used, and has an acoustic impedance equal to that of seawater, for example. .
次に本実施例の動作を設明する。水中の音響信
号は円筒形ゴム容器３５を通つて室３７内の液体
に伝わり、光フアイバ１１に作用し、光フアイバ
１１の長さを変化させ、屈折率を変化させる。一
方、内側の光フアイバ２１は外部円筒３９と遮音
材３８によつて遮音されているので、光フアイバ
１１の受けた音響信号を受けることがない。さら
に室３７と内側の室４１は数個の小孔４０ａ，４
０ｂを介して液体が流通するので、ほぼ同一の温
度に保つことができる。 Next, the operation of this embodiment will be explained. The acoustic signal in the water is transmitted through the cylindrical rubber container 35 to the liquid in the chamber 37 and acts on the optical fiber 11, causing the length of the optical fiber 11 to change and the refractive index to change. On the other hand, since the inner optical fiber 21 is sound-insulated by the outer cylinder 39 and the sound insulating material 38, it does not receive the acoustic signal received by the optical fiber 11. Further, the chamber 37 and the inner chamber 41 have several small holes 40a, 4
Since the liquid flows through 0b, it is possible to maintain almost the same temperature.
従つて温度差による光フアイバ１１と光フアイ
バ２１の長さの変化、回りの液体の粘度の変化等
の条件を同一とすることができ、圧電体１５，２
５に電圧を印加して、音響信号のない時に２つの
光フアイバのフアブリーペローの干渉出力を一致
させ、両出力の差を零となるように調整しておけ
ば、このフアブリーペローの干渉出力の差を監視
することにより、水中の音響信号を精度良く測定
できる。 Therefore, the conditions such as changes in the lengths of the optical fibers 11 and 21 due to temperature differences and changes in the viscosity of the surrounding liquid can be made the same, and the piezoelectric bodies 15 and 2
If a voltage is applied to 5 and the interference outputs of the Fabry-Perots of the two optical fibers match when there is no acoustic signal, and the difference between the two outputs is adjusted to zero, the difference in the interference outputs of the Fabry-Perots can be reduced. By monitoring, underwater acoustic signals can be measured with high accuracy.
（考案の効果）
以上、実施例を用いて説明したように、本考案
によれば両端面に半透膜を有する２組の同質、同
長の光フアイバの一方の一部分を、第１の剛円筒
の外周に巻付けてセンサ部とし、該剛円筒の内部
表面を遮音材で遮音し、他方の光フアイバの一部
を前記センサ部とした光フアイバと同長だけ前記
第１の剛円筒より十分小さい第２の剛円筒の外周
に巻付け、前記第１の剛円筒の内部に前記第２の
剛円筒を固定し、前記第１の剛円筒の両端を閉じ
て該剛円筒に複数個の小孔を設け、第１，第２の
剛円筒を同一の液体で満たしながら円筒形の弾性
体容器に封止した構造の光フアイバハイドロホン
を提供できるので、上記２組の光フアイバを音響
的に隔離すると同時に、ほぼ同一の温度の液体中
に保持することができ、小形で測定精度の良い光
フアイバハイドロホンを実現できる。(Effects of the invention) As described above using the embodiments, according to the invention, a part of one of two sets of optical fibers of the same quality and length having semipermeable membranes on both end faces is connected to the first rigid Wrap it around the outer periphery of a cylinder to form a sensor part, insulate the inner surface of the rigid cylinder with a sound insulating material, and extend a part of the other optical fiber from the first rigid cylinder by the same length as the optical fiber used as the sensor part. Wrap it around the outer periphery of a sufficiently small second rigid cylinder, fix the second rigid cylinder inside the first rigid cylinder, close both ends of the first rigid cylinder, and attach a plurality of pieces to the rigid cylinder. Since it is possible to provide an optical fiber hydrophone having a structure in which a small hole is provided and the first and second rigid cylinders are filled with the same liquid and sealed in a cylindrical elastic container, the two sets of optical fibers can be acoustically At the same time, it can be kept in a liquid at almost the same temperature, making it possible to create a compact optical fiber hydrophone with good measurement accuracy.
第１図は本考案の実施例の断面図、第２図は本
考案の実施例の動作原理を説明するためのブロツ
ク図、第３図は本考案に適用されるフアブリーペ
ロー干渉計の出力波形を示す図である。
１２，１３，２２，２３……半透膜、１１，２
１……光フアイバ、３９……外部円筒、３８……
遮音材、４２……内部円筒、４０ａ，４０ｂ……
小孔、３７……室、４１……内側の室、３５……
円筒形ゴム容器。
Fig. 1 is a cross-sectional view of an embodiment of the present invention, Fig. 2 is a block diagram for explaining the operating principle of the embodiment of the present invention, and Fig. 3 shows the output waveform of the Fabry-Perot interferometer applied to the present invention. FIG. 12, 13, 22, 23... Semi-permeable membrane, 11, 2
1... Optical fiber, 39... External cylinder, 38...
Sound insulation material, 42...inner cylinder, 40a, 40b...
Small hole, 37...chamber, 41...inner chamber, 35...
Cylindrical rubber container.
Claims (1)
ハイドロホンにおいて、両端面に半透膜を有する
２組の同質、同長の光フアイバの一方の一部分
を、第１の剛円筒の外周に巻付けてセンサ部と
し、該剛円筒の内部表面を遮音材で遮音し、他方
の光フアイバの一部を前記センサ部とした光フア
イバと同長だけ前記第１の剛円筒より十分小さい
第２の剛円筒の外周に巻付け、前記第１の剛円筒
の内部に前記第２の剛円筒を固定し、前記第１の
剛円筒の両端を閉じて該剛円筒に複数個の小孔を
設け、第１，第２の剛円筒を同一の液体で満たし
ながら円筒形の弾性体容器に封止した構造を特徴
とする光フアイバハイドロホン。 In an optical fiber hydrophone that applies a Fabry-Perot interferometer, a portion of one of two sets of optical fibers of the same quality and length having semipermeable membranes on both end faces is wrapped around the outer periphery of a first rigid cylinder to serve as a sensor section. , the inner surface of the rigid cylinder is sound insulated with a sound insulating material, and a part of the other optical fiber is attached to the outer periphery of a second rigid cylinder that is sufficiently smaller than the first rigid cylinder by the same length as the optical fiber used as the sensor section. the second rigid cylinder is fixed inside the first rigid cylinder, both ends of the first rigid cylinder are closed, a plurality of small holes are provided in the rigid cylinder, and the first and second An optical fiber hydrophone is characterized by a structure in which a rigid cylinder is filled with the same liquid and sealed in a cylindrical elastic container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12536584U JPS6141208U (en) | 1984-08-20 | 1984-08-20 | fiber optic hydrophone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12536584U JPS6141208U (en) | 1984-08-20 | 1984-08-20 | fiber optic hydrophone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6141208U JPS6141208U (en) | 1986-03-15 |
| JPH035875Y2 true JPH035875Y2 (en) | 1991-02-14 |
Family
ID=30684054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12536584U Granted JPS6141208U (en) | 1984-08-20 | 1984-08-20 | fiber optic hydrophone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6141208U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2022024217A1 (en) * | 2020-07-28 | 2022-02-03 | ||
| WO2023073873A1 (en) * | 2021-10-28 | 2023-05-04 | 日本電信電話株式会社 | Sound measurement device, sound measurement method, and program |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0771356B2 (en) * | 1987-01-28 | 1995-07-31 | 日本電気株式会社 | Optical fiber hydrophone |
-
1984
- 1984-08-20 JP JP12536584U patent/JPS6141208U/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2022024217A1 (en) * | 2020-07-28 | 2022-02-03 | ||
| WO2022024217A1 (en) * | 2020-07-28 | 2022-02-03 | 日本電信電話株式会社 | Sound measurement method |
| WO2023073873A1 (en) * | 2021-10-28 | 2023-05-04 | 日本電信電話株式会社 | Sound measurement device, sound measurement method, and program |
| JPWO2023073873A1 (en) * | 2021-10-28 | 2023-05-04 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6141208U (en) | 1986-03-15 |
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