JPH0765910B2 - Optical fiber sensor device - Google Patents
Optical fiber sensor deviceInfo
- Publication number
- JPH0765910B2 JPH0765910B2 JP61228626A JP22862686A JPH0765910B2 JP H0765910 B2 JPH0765910 B2 JP H0765910B2 JP 61228626 A JP61228626 A JP 61228626A JP 22862686 A JP22862686 A JP 22862686A JP H0765910 B2 JPH0765910 B2 JP H0765910B2
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- Prior art keywords
- optical
- pulse
- directional coupler
- sensor
- line
- 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 - Lifetime
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- Testing Or Calibration Of Command Recording Devices (AREA)
- Optical Transform (AREA)
- Light Guides In General And Applications Therefor (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光ファイバを用いて被測定機器に取り付けら
れた複数個の光センサに光パルスを供給し、そのセンサ
情報を受信して種々の計測結果を得るようにした光ファ
イバセンサ装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention uses an optical fiber to supply an optical pulse to a plurality of optical sensors attached to a device under test, receives the sensor information, and outputs various optical pulses. The present invention relates to an optical fiber sensor device adapted to obtain the measurement result.
光ファイバセンサは、低損失，広帯域，無誘導及び絶縁
性等、数多くの特長を有するため、その将来性が注目さ
れている。この光ファイバセンサの一方式に、電界，磁
界，圧力，温度等の物理刺激によって光パワーの透過量
が変化するものがある。たとえば、ポッケルス効果、フ
ァラデー効果を用いた光電圧，電流計などはこの方式の
ものである（例えば特公昭60−51689号公報，特公昭60
−51690号公報参照）。Since the optical fiber sensor has many features such as low loss, wide band, non-inductive property, and insulating property, its future potential is drawing attention. One method of this optical fiber sensor is one in which the transmission amount of optical power is changed by physical stimuli such as electric field, magnetic field, pressure and temperature. For example, an optical voltage and ammeter using the Pockels effect and the Faraday effect are of this type (for example, Japanese Examined Patent Publication No. 60-51689 and Japanese Examined Patent Publication No.
-51690 gazette).
従来、光ファイバを用いて複数個のセンサ情報を計測す
るにあたって、それぞれ異なる距離にある光センサ情報
を得る場合は、それぞれの被測定機器に取り付けられた
光センサに、レーザダイオード等を用いた光送信器から
送信された光パワーを送信線を通して光センサに送り、
光センサの計測信号を受信線を通して光受信器に受信し
て光センサの情報を得るようにしている。Conventionally, when measuring a plurality of sensor information using optical fibers, when obtaining the optical sensor information at different distances, the optical sensor attached to each device under test is equipped with an optical sensor such as a laser diode. The optical power transmitted from the transmitter is sent to the optical sensor through the transmission line,
The measurement signal of the optical sensor is received by the optical receiver through the receiving line to obtain the information of the optical sensor.
しかるに、複数個の光センサをそれぞれに、送信線及び
受信線を接続し、これらの線に光送信器あるいは光受信
器等を個別に設けているため、それぞれの光送信器ある
いは光受信器に伝送線あるいは受信線を接続する際、ど
の機器に対応するか識別が困難であるほか、装置が輻輳
化していた。However, since a plurality of optical sensors are connected to the transmission line and the reception line, and an optical transmitter or an optical receiver is individually provided on these lines, each optical transmitter or optical receiver is When connecting a transmission line or a reception line, it was difficult to identify which device corresponded, and the device was congested.
本発明は、このような従来の問題点を解決して、一本の
光ファイバ伝送路を用いて遠隔地にある複数の光センサ
情報の授受を行うことを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve such a conventional problem and to transmit / receive a plurality of optical sensor information at a remote place by using one optical fiber transmission line.
この目的を達成するため、本発明の光ファイバセンサ装
置は、光パルスを発生する光送信器と、該光送信器から
出力される光パルスを伝送する一本の光ファイバからな
る光幹線路と、該光幹線路から分岐される少なくとも一
つの分岐光線路と、該分岐光線路に接続された方向性結
合器と、外部の物理的，電磁的刺激で光パワーの透過量
が変化する光センサと、長さが異なり、それぞれの一端
が前記方向性結合器に接続され、それぞれの他端が前記
光センサの両端に対向して接続される２つの光線路とを
備え、前記方向性結合器は、前記２つの光線路を介して
前記光センサの両端からそれぞれ入射した光パルスの透
過光を前記２つの光線路を介して重畳するものであり、
さらに、前記方向性結合器により重畳された光信号を前
記光幹線路を介して受信する光受信器と、受信した光信
号のピーク値を検出する信号処理装置を設けたことを特
徴とする。In order to achieve this object, the optical fiber sensor device of the present invention comprises an optical transmitter that generates an optical pulse, and an optical trunk line that is composed of one optical fiber that transmits the optical pulse output from the optical transmitter. , At least one branch optical line branched from the optical trunk line, a directional coupler connected to the branch optical line, and an optical sensor in which the amount of transmission of optical power is changed by an external physical or electromagnetic stimulus And two optical lines having different lengths, one end of each of which is connected to the directional coupler and the other end of each of which is oppositely connected to both ends of the photosensor. Is to superimpose, through the two optical lines, the transmitted light of the optical pulses respectively incident from both ends of the optical sensor via the two optical lines.
Further, an optical receiver for receiving the optical signal superimposed by the directional coupler via the optical trunk line, and a signal processing device for detecting a peak value of the received optical signal are provided.
本発明の光ファイバセンサ装置は、光ファイバの広帯域
性をうまく利用したもので、データハイウェイといわれ
る一本の光幹線路に多くのセンサヘッドを配置して、面
的及び線的にひろがったセンサ情報を効率よく収集する
システムである。The optical fiber sensor device of the present invention makes good use of the wide band property of an optical fiber, and a large number of sensor heads are arranged in one optical trunk line called a data highway to spread the sensor in a planar and linear manner. It is a system that collects information efficiently.
光パルスの多重化によるマルチプレキシング法には、透
過形センサを使用した一線式及び二線式、反射形センサ
を使用した一線式等が提案されている。As the multiplexing method by multiplexing light pulses, one-line type and two-line type using a transmission type sensor, one-line type using a reflection type sensor, etc. have been proposed.
本発明においては、一本の光幹線路を備え、光送信器か
ら送信された光パルスを、異なる距離に取り付けられた
それぞれの光センサに分岐して送信し、それぞれの光セ
ンサからの計測信号を光幹線路に送信に、光幹線路から
光受信器に受信した光パルスの到達した時間差によっ
て、光センサの位置を特定し、光パルスの波形から計測
信号を得る。各光センサにおいては、光送信器によって
送信された光パルスは方向性結合器によって２つの長さ
の異なる光線路に分岐され、遅れ時間をもって光センサ
の両端から入射する。入射した光パルスは光センサを透
過し、光線路を通って方向性結合器に到達する。２つの
透過光の光路長はいずれも２つの光線路の長さの和であ
り等しいので、方向性結合器においては、光センサを透
過した２つの光パルスは同じ時刻で重畳され、光センサ
の端面による反射光とは区別できるピークを持つことが
できる。このピーク値を監視することにより、各端末の
物理状態の変化を検出することができる。In the present invention, a single optical trunk line is provided, and an optical pulse transmitted from an optical transmitter is branched and transmitted to each optical sensor attached at a different distance, and a measurement signal from each optical sensor is transmitted. To the optical trunk line, the position of the optical sensor is specified by the time difference of arrival of the optical pulse received from the optical trunk line to the optical receiver, and the measurement signal is obtained from the waveform of the optical pulse. In each optical sensor, the optical pulse transmitted by the optical transmitter is branched into two optical lines having different lengths by the directional coupler, and enters from both ends of the optical sensor with a delay time. The incident optical pulse passes through the optical sensor and reaches the directional coupler through the optical line. Since the optical path lengths of the two transmitted lights are equal to the sum of the lengths of the two optical lines, the two optical pulses transmitted through the optical sensor are superposed at the same time in the directional coupler, and It can have a peak that can be distinguished from the light reflected by the end face. By monitoring this peak value, it is possible to detect a change in the physical state of each terminal.
以下、本発明を図面に示す実施例に基づいて具体的に説
明する。Hereinafter, the present invention will be specifically described based on the embodiments shown in the drawings.
第１図は本発明の実施例を示すものである。図におい
て、１は電気パルス発生器、２は電気パルスを光パルス
に変換して送出するレーザダイオード等の光送信器、３
は光ファイバを用いた光幹線路である。４は光幹線路３
に接続した方向性結合器であり、光幹線路３を通る通信
の光パルスを受信用光線路５に分岐するようにしてい
る。６は光受信器、７は増幅器、８は信号処理装置、９
は表示装置、10a,10b,・・・10nは光幹線路３に接続し
た方向性結合器、11a,11b,‥‥11nは光ファイバよりな
る分岐光線路、12a,12b,‥‥12nは方向性結合器、13a,1
3b,‥‥13nは光センサである。これらの光センサは、例
えば、電気光学結晶13a1,13b1,‥‥13n1の両端面に偏光
子13a2,13a3,13b2,13b3,‥‥13n2,13n3が設けられ、被
測定機器（図示せず）に取り付けられ、被測定機器にお
ける電圧、電流、磁界等の状態を検出するものである。
また、光センサには、一端に光ファイバを用いた長さl1
の光線路14a,14b,‥‥14nを介して前記方向性結合器12
a,12b,・・・・・12nの一方端が接続され、他端に光フ
ァイバを用いた前記光線路14a,14b,・・・14nの長さl1
よりΔｌ長いl2の光線路15a,15b,‥‥15nが接続されて
いる。FIG. 1 shows an embodiment of the present invention. In the figure, 1 is an electric pulse generator, 2 is an optical transmitter such as a laser diode for converting an electric pulse into an optical pulse and transmitting the optical pulse, 3
Is an optical trunk line using an optical fiber. 4 is the optical trunk line 3
Is a directional coupler connected to the optical path for communication, and branches the optical pulse of communication passing through the optical trunk line 3 to the receiving optical line 5. 6 is an optical receiver, 7 is an amplifier, 8 is a signal processing device, 9
Is a display device, 10a, 10b, ... 10n are directional couplers connected to the optical trunk line 3, 11a, 11b, ... 11n are branch optical lines made of optical fibers, 12a, 12b, Sex coupler, 13a, 1
3b, ... 13n are optical sensors. These optical sensors include, for example, polarizers 13a 2 , 13a 3 , 13b 2 , 13b 3 , ... 13n 2 , 13n 3 provided on both end surfaces of the electro-optic crystal 13a 1 , 13b 1 , ... 13n 1 . It is attached to a device under test (not shown) and detects the state of voltage, current, magnetic field, etc. in the device under test.
The optical sensor has a length l 1 with an optical fiber at one end.
The directional coupler 12 via the optical lines 14a, 14b, ...
The length l 1 of the optical lines 14a, 14b, ..., 14n, to which one end of a, 12b ,.
The optical lines 15a, 15b, ..., 15n of l 2 longer by Δl are connected.
パルス発生器１から発生される電気パルスは、光送信器
２で光パルスに変換されて光幹線路３に送り出される。
この光パルスはそれぞれの方向性結合器10a,10b,・・・
10nで分岐されて分岐光線路11a,11b,‥‥11nを通り、方
向性結合器12a,12b,‥‥12nに送信される。The electric pulse generated from the pulse generator 1 is converted into an optical pulse by the optical transmitter 2 and sent out to the optical trunk line 3.
This optical pulse is generated by each directional coupler 10a, 10b, ...
It is branched at 10n, passes through branch optical lines 11a, 11b, ... 11n, and is transmitted to directional couplers 12a, 12b ,.
さて、方向性結合器12aに受信した光パルスは方向性結
合器12aにより２つに分岐され、それぞれの光線路14a,1
5aに送信される。光線路14aを通過する光パルスが光セ
ンサ13aに達すると、光パルスの一部は光センサに当た
って反射し、反射光の光パルスとなって光線路14aに送
信され、残部は光センサを浸透する透過光の光パルスと
なって光線路15aに送信される。Now, the optical pulse received by the directional coupler 12a is split into two by the directional coupler 12a, and the respective optical lines 14a, 1
Sent to 5a. When the optical pulse passing through the optical line 14a reaches the optical sensor 13a, a part of the optical pulse hits the optical sensor and is reflected, and becomes a light pulse of reflected light to be transmitted to the optical line 14a, and the rest penetrates the optical sensor. The light pulse of the transmitted light is transmitted to the optical line 15a.
しかして、光線路15aは光線路14aよりΔｌ長く構成され
ているため、光線路14aを透過する反射光の光パルスが
光線路15aを透過する透過光の光パルスよりｔ時間早く
方向性結合器12aを通り、分岐光線路11a,方向性結合器1
0a,光幹線路３を経て、方向性結合器４で分岐されて受
信用光線路５から光受信器６に送られる。Since the optical line 15a is configured to be Δl longer than the optical line 14a, the optical pulse of the reflected light that passes through the optical line 14a is earlier than the optical pulse of the transmitted light that passes through the optical line 15a by a time period t times faster than the directional coupler. 12a, branch optical line 11a, directional coupler 1
After passing through 0a and the optical trunk line 3, it is branched by the directional coupler 4 and sent from the receiving optical line 5 to the optical receiver 6.
一方、光線路15aを通過する光パルスが光センサ13aに達
すると、前記と同じように光パルスの一部は光センサに
当たって反射し、反射光の光パルスとなって光線路15a
に送信され、残部は光センサを透過する透過光の光パル
スとなって光線路14aに送信される。光線路14aを通過す
る透過光の光パルスが光線路15aを通過する反射光の光
パルスよりもｔ時間早く方向性結合器12aを通り、分岐
光線路11a,方向性結合器10a,光幹線路3,方向性結合器４
を通り、受信用光線路５から光受信器６に送信される。On the other hand, when the optical pulse passing through the optical line 15a reaches the optical sensor 13a, a part of the optical pulse hits the optical sensor and is reflected in the same manner as described above, and becomes an optical pulse of reflected light.
Is transmitted to the optical line 14a as an optical pulse of transmitted light that passes through the optical sensor. The optical pulse of the transmitted light passing through the optical line 14a passes through the directional coupler 12a earlier than the optical pulse of the reflected light passing through the optical line 15a through the directional coupler 12a, and the branched optical line 11a, the directional coupler 10a, and the optical trunk line. 3, directional coupler 4
Is transmitted from the receiving optical line 5 to the optical receiver 6.
第２図は、光受信器６で受信したそれぞれの光パルスの
特性図で、横軸に時間を、縦軸にパルスの高さをとって
いる。Ａは方向性結合器12aで２つに分岐され、光線路1
4aに送信された光パルスを示し、Ｂは方向性結合器12a
で２つに分岐され、光線路15aを通る光パルスである。
ａは光線路14aを通る光パルスで、ｂは光線路15aを通る
光パルスである。光受信器６で受信した光パルスは増幅
器７で増幅され、信号処理装置８で処理され、表示装置
９に出力される。FIG. 2 is a characteristic diagram of each optical pulse received by the optical receiver 6, in which the horizontal axis represents time and the vertical axis represents pulse height. A is divided into two by the directional coupler 12a, and the optical line 1
4a shows an optical pulse transmitted to 4a, B is a directional coupler 12a
Is an optical pulse that is branched into two and passes through the optical line 15a.
a is an optical pulse passing through the optical line 14a, and b is an optical pulse passing through the optical line 15a. The optical pulse received by the optical receiver 6 is amplified by the amplifier 7, processed by the signal processing device 8, and output to the display device 9.
Ａ−ｂの光パルスとＢ−ａの光パルス、すなわち方向性
結合器12aで２つに分岐され光線路14aに送出され、光パ
ルスのうち光センサ13aを透過する透過光の光パルス
と、光線路15aに送り出された光パルスのうち光センサ1
3aを透過する透過光の光パルスとが重畳され、第３図に
示すように中央に透過光の光パルスが、その両側に光セ
ンサの反射光の光パルスがそれぞれ表示される。いまこ
の光センサを被測定機器に取り付け、被測定機器の磁界
を測定する場合、被測定器を磁界が発生していると、光
センサ13aが磁界を検出して第３図に示すように光セン
サの透過光の光パルスが出力され、磁界がなくなると出
力されなくなる。また磁界が変化すると、第３図の中央
のパルスの高さが上下し、磁界の大きさに変化があった
ことを知ることができる。An optical pulse of Ab and an optical pulse of Ba, that is, an optical pulse of transmitted light that is branched into two by the directional coupler 12a and is transmitted to the optical line 14a and that is transmitted through the optical sensor 13a among the optical pulses; Optical sensor 1 of the optical pulses sent to the optical line 15a
The light pulse of the transmitted light passing through 3a is superimposed, and the light pulse of the transmitted light is displayed in the center and the light pulse of the reflected light of the optical sensor is displayed on both sides thereof as shown in FIG. Now, when this optical sensor is attached to the device under test and the magnetic field of the device under test is measured, if a magnetic field is generated in the device under test, the optical sensor 13a detects the magnetic field and the An optical pulse of the transmitted light of the sensor is output, and is not output when the magnetic field disappears. Also, when the magnetic field changes, the height of the central pulse in FIG. 3 rises and falls, and it can be seen that the magnitude of the magnetic field has changed.
第４図は、光受信器６によって受信された光情報のパワ
ー波形図であり、各端末の距離に相当する時間だけずれ
た、ピーク値が対数的に減衰した特性を見ることができ
る。FIG. 4 is a power waveform diagram of the optical information received by the optical receiver 6, and it is possible to see the characteristic that the peak value is logarithmically attenuated, being shifted by a time corresponding to the distance of each terminal.
以上に説明したように、本発明においては、光センサの
両側に長さの異なる２本の光ファイバを接続しその他端
を方向性結合器に接続して入力側から送信された光パル
スの応答信号を受信側に返信するようにしている。光セ
ンサにおいては、物理変化又は電磁的影響により光セン
サを透過する光の透過条件が変わり、光の遅延作用によ
り重畳された光パルスの中央のピーク値が変化する。こ
れにより、一本の光幹線路で複数の端末の物理状況の変
化を検出することができる。As described above, in the present invention, the response of the optical pulse transmitted from the input side is obtained by connecting two optical fibers having different lengths on both sides of the optical sensor and connecting the other ends to the directional coupler. The signal is sent back to the receiving side. In the optical sensor, the transmission condition of the light passing through the optical sensor changes due to a physical change or an electromagnetic effect, and the central peak value of the superposed light pulse changes due to the delay effect of the light. As a result, it is possible to detect changes in the physical status of a plurality of terminals with one optical trunk line.
第１図は本発明の構成を示す回路図、第２図は光パルス
の遅延の状態を示す光パルス波形図、第３図は重畳され
た透過光の波形図、第４図は受信された光信号の光パワ
ー図である。 1:電気パルス発生器、2:光送信器 3:光幹線路、4:方向性結合器 5:受信用光線路、6:光受信器 7:増幅器、8:信号処理装置 9:表示装置 10a,10b,‥‥10n:方向性結合器 11a,11b,‥‥11n:分岐光線路 12a,12b,‥‥12n:方向性結合器 13a,13b,‥‥13n:光センサ 13a1,13b1,‥‥13n1:電気光学結晶 13a2,13a3,13b2,13b3,・・・13n2,13n3:偏光子 14a,14b,‥‥14n:光線路 15a,15b,‥‥15n:光線路FIG. 1 is a circuit diagram showing the configuration of the present invention, FIG. 2 is an optical pulse waveform diagram showing the state of delay of an optical pulse, FIG. 3 is a waveform diagram of superimposed transmitted light, and FIG. 4 is received. It is the optical power figure of an optical signal. 1: Electric pulse generator, 2: Optical transmitter 3: Optical trunk line, 4: Directional coupler 5: Optical line for reception, 6: Optical receiver 7: Amplifier, 8: Signal processing device 9: Display device 10a , 10b, ... 10n: Directional coupler 11a, 11b, ... 11n: Branch optical line 12a, 12b, ... 12n: Directional coupler 13a, 13b, ... 13n: Optical sensor 13a 1 , 13b 1 , 13n 1 : Electro-optic crystal 13a 2 , 13a 3 , 13b 2 , 13b 3 , ・ ・ ・ 13n 2 , 13n 3 : Polarizer 14a, 14b, 14n: Optical line 15a, 15b, 15n: Ray Road
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０８Ｃ 23/04 (56)参考文献 特開 昭58−105397（ＪＰ，Ａ) 特開 昭56−21010（ＪＰ，Ａ) 特開 昭56−112608（ＪＰ，Ａ) 特開 昭57−189030（ＪＰ，Ａ) 実開 昭54−114955（ＪＰ，Ｕ) 実開 昭57−142332（ＪＰ，Ｕ) 実開 昭57−75539（ＪＰ，Ｕ) 実開 昭57−171526（ＪＰ，Ｕ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication location G08C 23/04 (56) References JP-A-58-105397 (JP, A) JP-A-56- 21010 (JP, A) JP 56-112608 (JP, A) JP 57-189030 (JP, A) Actually opened 54-114955 (JP, U) Actually opened 57-142332 (JP, U) Actual Open Sho 57-75539 (JP, U) Actual Open Sho 57-171526 (JP, U)
Claims (1)
器から出力される光パルスを伝送する一本の光ファイバ
からなる光幹線路と、該光幹線路から分岐される少なく
とも一つの分岐光線路と、該分岐光線路に接続された方
向性結合器と、外部の物理的，電磁的刺激で光パワーの
透過量が変化する光センサと、長さが異なり、それぞれ
の一端が前記方向性結合器に接続され、それぞれの他端
が前記光センサの両端に対向して接続される２つの光線
路とを備え、前記方向性結合器は、前記２つの光線路を
介して前記光センサの両端からそれぞれ入射した光パル
スの透過光を前記２つの光線路を介して重畳するもので
あり、さらに、前記方向性結合器により重畳された光信
号を前記光幹線路を介して受信する光受信器と、受信し
た光信号のピーク値を検出する信号処理装置を設けたこ
とを特徴とする光ファイバセンサ装置。1. An optical transmitter for generating an optical pulse, an optical trunk line composed of one optical fiber for transmitting an optical pulse output from the optical transmitter, and at least one branched from the optical trunk line. Two branched optical lines, a directional coupler connected to the branched optical lines, an optical sensor in which the amount of transmitted optical power changes due to an external physical or electromagnetic stimulus, and the lengths are different. Two optical lines connected to the directional coupler, the other ends of which are oppositely connected to both ends of the photosensor, and the directional coupler has the two optical lines through the two optical lines. Transmitted light of optical pulses respectively incident from both ends of an optical sensor is superimposed via the two optical lines, and an optical signal superimposed by the directional coupler is received via the optical trunk line. Optical receiver and the peak of the received optical signal Optical fiber sensor apparatus characterized in that a signal processing device for detecting a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61228626A JPH0765910B2 (en) | 1986-09-26 | 1986-09-26 | Optical fiber sensor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61228626A JPH0765910B2 (en) | 1986-09-26 | 1986-09-26 | Optical fiber sensor device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6382320A JPS6382320A (en) | 1988-04-13 |
| JPH0765910B2 true JPH0765910B2 (en) | 1995-07-19 |
Family
ID=16879287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61228626A Expired - Lifetime JPH0765910B2 (en) | 1986-09-26 | 1986-09-26 | Optical fiber sensor device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0765910B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0895075A3 (en) * | 1997-07-31 | 1999-10-20 | Litton Systems, Inc. | Time-division multiplexed array of optical non-acoustic pressure sensors |
| US5987197A (en) * | 1997-11-07 | 1999-11-16 | Cidra Corporation | Array topologies for implementing serial fiber Bragg grating interferometer arrays |
| EP2330390B1 (en) * | 2008-08-20 | 2017-05-17 | Kabusikikaisha Watanabeseisakusyo | Optical fiber sensing system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5621010A (en) * | 1979-07-28 | 1981-02-27 | Fujitsu Ltd | System for measuring analogue quantity by light |
| JPS58105397A (en) * | 1981-12-17 | 1983-06-23 | 松下電器産業株式会社 | Light sensor device |
-
1986
- 1986-09-26 JP JP61228626A patent/JPH0765910B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6382320A (en) | 1988-04-13 |
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