JPS6224725B2 - - Google Patents
Info
- Publication number
- JPS6224725B2 JPS6224725B2 JP810680A JP810680A JPS6224725B2 JP S6224725 B2 JPS6224725 B2 JP S6224725B2 JP 810680 A JP810680 A JP 810680A JP 810680 A JP810680 A JP 810680A JP S6224725 B2 JPS6224725 B2 JP S6224725B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- fiber coil
- fiber
- movable body
- coil
- 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
- 239000000835 fiber Substances 0.000 claims description 53
- 239000013307 optical fiber Substances 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/28—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication
- G01D5/30—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication the beams of light being detected by photocells
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Description
【発明の詳細な説明】
本発明は光フアイバコイルを用いて被測定物の
位置を検出する位置検出器に関し、その目的とす
るところは、光フアイバを巻回して曲率半径の小
さなフアイバコイルを形成するとともに、このフ
アイバコイルから漏れた光を、被測定物の位置に
よつて変化する光入力可動体（鏡又はフアイバコ
イル）を用いて元のフアイバコイルに戻して可動
体の変化量に応じた光を出力するようにし、よつ
て無電源で場所の制約を受けることなく被測定物
の位置を検出する位置検出器を提供するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a position detector that detects the position of an object to be measured using an optical fiber coil, and its purpose is to form a fiber coil with a small radius of curvature by winding an optical fiber. At the same time, the light leaking from this fiber coil is returned to the original fiber coil using a light input movable body (mirror or fiber coil) that changes depending on the position of the object to be measured, and the light is returned to the original fiber coil according to the amount of change in the movable body. The present invention provides a position detector that outputs light and thus detects the position of an object to be measured without a power source and without being subject to space restrictions.
以下、本発明の一実施例について図面を参照し
て説明するにあたり、先ず光フアイバの損失につ
いて述べる。光フアイバの損失は、コア部内部の
不純物による吸収損失の外に、コア部の屈折率の
不均一性による散乱損失、光フアイバの曲りによ
る回折損失等があり、しかも回折損失は光フアイ
バの曲率半径が小さい程大きく変化する。これら
の損失を総合して全損失と呼ぶ。この全損失中、
特に、回折損失は光フアイバを強く曲げると、光
（電磁波）がコア部内部で曲がり切れずに外部に
漏れる現象であつて、その光の漏れ量は曲率半
径、光フアイバの種類および光の伝播周波数によ
つて異なる。光フアイバの種類は、母体となるガ
ラスの種類とコア部付近の屈折率分布から種々の
ものがあり、第１図はSiO2をベースにして不純
物PiO2（２酸化チタン）、GeO2（２酸化ゲルマニ
ウム）、P2O5（５酸化リン）を適宜混合して得た
３種類の光フアイバＡ，Ｂ，Ｃの回折損失つまり
光の漏れ量（但し、光の伝播周波数一定）の実測
値を示す。この図から明らかなように、光フアイ
バの曲率半径を略90mm以下にすると、光フアイバ
からの光の漏れ量が非常に大きくなり、その分だ
け光フアイバー端部から入力した光が減衰して光
フアイバ他端部から出力する光の光量を低下させ
ることになる。 In explaining one embodiment of the present invention with reference to the drawings, loss in the optical fiber will first be described. Optical fiber losses include absorption loss due to impurities inside the core, scattering loss due to non-uniformity of refractive index in the core, and diffraction loss due to bending of the optical fiber.Moreover, diffraction loss is caused by the curvature of the optical fiber. The smaller the radius, the greater the change. These losses are collectively called the total loss. During this total loss,
In particular, diffraction loss is a phenomenon in which when an optical fiber is bent strongly, light (electromagnetic waves) leaks outside without being able to fully bend inside the core.The amount of light leakage depends on the radius of curvature, the type of optical fiber, and the propagation of light. Depends on frequency. There are various types of optical fibers depending on the type of glass used as the matrix and the refractive index distribution near the core. Actual measurements of the diffraction loss, that is, the amount of light leakage (however, the propagation frequency of light is constant) of three types of optical fibers A, B, and C obtained by appropriately mixing germanium oxide) and P 2 O 5 (phosphorous pentoxide). shows. As is clear from this figure, when the radius of curvature of the optical fiber is set to approximately 90 mm or less, the amount of light leaking from the optical fiber becomes extremely large, and the light input from the end of the optical fiber is attenuated by that amount. This results in a reduction in the amount of light output from the other end of the fiber.
そこで、本発明は以上述べた光フアイバの回折
損失を利用して被測定物の位置を検出するもので
あり、以下、その実施例を述べる。第２図は例え
ば液体の液位を検出する場合等の例である。この
位置検出器は、支持体１０に穿孔された開口部に
筒体１１を挿通し、この筒体１１は筒体上端部の
つば１１ａを支持体１０に係合しねじ１２によつ
て固定される。この筒体１１の内壁部には光フア
イバ１３を巻装して形成されたフアイバコイル１
４が配置されている。この内壁部に銀メツキ等を
施こし、より光を反射できるようにして反射効率
を高めてもよい。なお、筒体１１の内径は比較的
小さく形成されているので、この筒体内側に配置
せるフアイバコイル１４の曲率半径が小さく、こ
のため光源１５からコイル一端部に光を入力する
と、その光の大半がフアイバコイル外部に漏れ、
コイル他端部から出力せられる光は殆んど減衰さ
れた状態となる。１６は受光素子である。 Therefore, the present invention detects the position of an object to be measured by utilizing the above-mentioned diffraction loss of the optical fiber, and an embodiment thereof will be described below. FIG. 2 shows an example in which the level of liquid is detected, for example. In this position detector, a cylindrical body 11 is inserted into an opening bored in a support 10, and the cylindrical body 11 is fixed with a screw 12 by engaging a collar 11a at the upper end of the cylinder with the support 10. Ru. A fiber coil 1 is formed by winding an optical fiber 13 on the inner wall of the cylinder 11.
4 is placed. This inner wall portion may be plated with silver or the like to reflect more light and increase reflection efficiency. Note that since the inner diameter of the cylindrical body 11 is relatively small, the radius of curvature of the fiber coil 14 disposed inside the cylindrical body is small, and therefore, when light is input from the light source 15 to one end of the coil, the light is Most of it leaks outside the fiber coil,
Most of the light output from the other end of the coil is attenuated. 16 is a light receiving element.
一方、このフアイバコイル１４の内側には、図
示しない被測定物となる液体の液位の変化に追従
して昇降する駆動軸１７が挿入され、しかもこの
駆動軸１７の胴部一部に表面鏡１８を装着してい
る。この表面鏡１８は可動しながらフアイバコイ
ル１４の漏洩光を反射させて該コイル１４に戻す
光入力可動体を構成している。従つて、液位の変
化によつて表面鏡１８が昇降し、これによつてフ
アイバコイル１４から漏れた光が該表面鏡１８で
反射されて再びフアイバコイル１４に戻つて入力
される。この反射された光の量は表面鏡１８の昇
降によつて異なるので、この結果、フアイバコイ
ル１４の他端部に近接配置される受光素子１６で
はその光の変化から表面鏡１８の上端部がどの位
置にあり、ひいては液位がどの程度であるかを容
易に知ることができる。１９は駆動軸１７のガイ
ド部材である。第３図は第２図を簡略化した構成
図である。 On the other hand, a drive shaft 17 is inserted inside the fiber coil 14 and moves up and down in accordance with changes in the liquid level of a liquid (not shown), which is an object to be measured. I am wearing 18. This surface mirror 18 constitutes a light input movable body that reflects leaked light from the fiber coil 14 and returns it to the coil 14 while moving. Therefore, the surface mirror 18 moves up and down as the liquid level changes, whereby the light leaking from the fiber coil 14 is reflected by the surface mirror 18 and inputted back into the fiber coil 14. Since the amount of reflected light varies depending on the elevation of the front mirror 18, as a result, the light receiving element 16 disposed close to the other end of the fiber coil 14 detects the upper end of the front mirror 18 due to the change in light. You can easily know where it is located and what the liquid level is. 19 is a guide member for the drive shaft 17. FIG. 3 is a simplified configuration diagram of FIG. 2.
次に、第４図は本発明の他の実施例である。即
ち、この位置検出器は、第２図とは反対に光入力
可動体をフアイバコイル１４の外側に配置したも
のである。この光入力可動体は、底部を閉塞し内
側に内面鏡２１を設けた筒体２２で構成され、こ
れに駆動軸１７を取着するとともに、この筒体２
２の内側の巻付体（筒体でも可）に光フアイバ１
３を巻装したフアイバコイル１４を配置したもの
である。 Next, FIG. 4 shows another embodiment of the present invention. That is, in this position detector, the optical input movable body is arranged outside the fiber coil 14, contrary to the configuration shown in FIG. This light input movable body is composed of a cylinder 22 whose bottom is closed and an inner mirror 21 is provided inside.
Optical fiber 1 is wrapped around the inner wrapping body of 2 (a cylindrical body is also possible).
3 is arranged.
この位置検出器にあつては、第２図と同様に駆
動軸１７の昇降によつて光入力可動体が昇降する
ため、フアイバコイル１４から漏れた光が内面鏡
２１で反射されて再びフアイバコイル１４に入
り、同フアイバコイル１４から出力する光の光量
を増加させるので、この出力光の光量変化からプ
ロセス量ひいては被測定物の位置を検出すること
ができる。 In this position detector, the light input movable body moves up and down as the drive shaft 17 moves up and down, as shown in FIG. 14, and increases the amount of light output from the fiber coil 14, so that the process amount and the position of the object to be measured can be detected from the change in the amount of output light.
なお、上記実施例はフアイバコイル１４の内側
又は外側に光入力可動体を配置したものである
が、内側と外側の両方に配置してもよいことは言
うまでもない。 In the above embodiment, the optical input movable body is arranged inside or outside the fiber coil 14, but it goes without saying that it may be arranged both inside and outside.
次に、第５図は本発明の他の実施例を示す構成
図である。この位置検出器は、第１のフアイバコ
イル１４ａと第２のフアイバコイル１４ｂとを同
軸的に配置してこれらのコイル１４ａ，１４ｂ内
部に駆動軸１７に装着した表面鏡１８を挿通す
る。そして、第１のフアイバコイル１４ａは常時
表面鏡１８との対向面積を変えない基準スパン部
ＬOを形成し、第２のフアイバコイル１４ｂは被
測定物の位置変化によつて表面鏡１８との対向面
積を変える測定スパン部ＬXを形成している。 Next, FIG. 5 is a block diagram showing another embodiment of the present invention. This position detector has a first fiber coil 14a and a second fiber coil 14b arranged coaxially, and a surface mirror 18 attached to a drive shaft 17 inserted into these coils 14a and 14b. The first fiber coil 14a forms a reference span portion L O whose facing area with the front mirror 18 does not change at all times, and the second fiber coil 14b forms a reference span portion L O whose facing area with the front mirror 18 does not change at all times. A measurement span portion LX is formed that changes the facing area.
今、光源１５からの光を分岐器３０で分岐して
前記２つのフアイバコイル１４ａ，１４ｂの一端
部に入力するものとする。 Now, assume that the light from the light source 15 is split by the splitter 30 and input to one end of the two fiber coils 14a and 14b.
この場合、基準スパン部ＬOとなる第１のフア
イバコイル１４ａの他端部から出力される光は、
フアイバコイル１４ａと表面鏡１８との対向面積
不変故常に一定光量の基準光となる。そこで、こ
の基準光を受光素子３１に供給し、ここで電気信
号に変換し更に増幅回路３２で増幅して出力すれ
ば、抵抗３３両端には常に等しいレベルの基準電
圧ＥOが得られる。一方、測定スパン部ＬXとなる
第２のフアイバコイル１４ｂの他端部から出力さ
れる測定光は、表面鏡１８の位置変化によつて対
向面積が変つているので変化することになる。従
つて、この測定光を受光素子３４に供給し、ここ
で電気信号に変換し更に増幅回路３５で増幅して
出力すれば、被測定物の位置によつて変化する測
定電圧ＥXが得られる。このようにして、測定電
圧ＥXと基準電圧ＥOとを得たならば、これらの電
圧ＥX，ＥOを後続の減算機能を有する増幅回路３
６に入れて減算増幅すると、β（ＥX―ＥO）の電
圧信号を取り出すことができる。従つて、両電圧
の差電圧からプロセス量ひいては被測定物の位置
を正確に検出することができる。ただしβは定数
である。 In this case, the light output from the other end of the first fiber coil 14a, which is the reference span section L O , is as follows:
Since the facing area of the fiber coil 14a and the front mirror 18 remains unchanged, the reference light always has a constant amount of light. Therefore, by supplying this reference light to the light-receiving element 31, converting it into an electrical signal there, amplifying it in the amplifier circuit 32, and outputting it, a reference voltage E O of the same level can always be obtained across the resistor 33. On the other hand, the measurement light outputted from the other end of the second fiber coil 14b serving as the measurement span section LX changes because the opposing area changes due to the change in the position of the front mirror 18. Therefore, by supplying this measurement light to the light-receiving element 34, converting it into an electrical signal there, amplifying it in the amplifier circuit 35, and outputting it, a measurement voltage E X that changes depending on the position of the object to be measured can be obtained. . Once the measurement voltage E X and the reference voltage E O are obtained in this way, these voltages E
6 and subtract and amplify it, it is possible to extract a voltage signal of β(E x −E o ). Therefore, the process amount and the position of the object to be measured can be accurately detected from the voltage difference between the two voltages. However, β is a constant.
次に、第６図は同じく本発明の他の実施例を示
す図である。この位置検出器は、基準側フアイバ
コイル１４ａと測定側フアイバコイル１４ｂとを
同軸的に配置する点は第５図と同じであり、特に
第５図と異なるところは、反射鏡として機能する
表面鏡１８の代りに駆動軸１７に光を故意に外部
に漏らす漏洩光用フアイバコイル４０を設けたも
のである。 Next, FIG. 6 is a diagram showing another embodiment of the present invention. This position detector is the same as that shown in FIG. 5 in that the reference side fiber coil 14a and the measurement side fiber coil 14b are arranged coaxially. Instead of 18, a leakage light fiber coil 40 is provided on the drive shaft 17 to intentionally leak light to the outside.
而して、この位置検出器にあつては、光源１５
から分岐器３０を経て３分岐された光をフアイバ
コイル１４ａ，１４ｂ，４０の一端部に入力す
る。基準側フアイバコイル１４ａは常時漏洩光用
フアイバコイル４０から漏洩光を受けているの
で、コイル１４ａ他端部から常に定まつた光量の
基準光を取り出すことができる。一方、測定側フ
アイバコイル１４ｂはプロセス量の変化によつて
漏洩光用フアイバコイル４０との対向面積を変え
るため、そのプロセス量によつて測定側フアイバ
コイル１４ｂの他端部から出力する測定光の光量
は常に変化している。そこで、測定側フアイバコ
イル１４ｂと漏洩光用フアイバコイル４０の出力
光とを光集合器４１で集合し、受光素子３４で電
気信号に変換して増幅回路３４で増幅して得た測
定電圧ＥXを、基準光を受光素子３１で電気信号
に変換し増幅回路３２で増幅して得た基準電圧Ｅ
Oで引算すると、第５図と全く同様の動作によつ
て差電圧を取り出すことができる。 Therefore, in this position detector, the light source 15
The light that is split into three through the splitter 30 is input to one end of the fiber coils 14a, 14b, and 40. Since the reference side fiber coil 14a always receives leakage light from the leakage light fiber coil 40, a constant amount of reference light can always be taken out from the other end of the coil 14a. On the other hand, since the measurement side fiber coil 14b changes the area facing the leakage light fiber coil 40 depending on the process amount, the measurement light output from the other end of the measurement side fiber coil 14b changes depending on the process amount. The amount of light is constantly changing. Therefore, the output lights of the measurement side fiber coil 14b and the leakage light fiber coil 40 are collected by the light collector 41, converted into an electric signal by the light receiving element 34, and amplified by the amplifier circuit 34 to obtain the measurement voltage E A reference voltage E is obtained by converting the reference light into an electric signal by the light receiving element 31 and amplifying it by the amplifier circuit 32.
By subtracting by O , the differential voltage can be obtained by an operation exactly similar to that shown in FIG.
なお、本発明はその要旨を逸脱しない範囲で
種々変形実施できる。即ち、上記実施例では、被
測定物として液体の液位の検出について述べた
が、駆動軸１７の位置を可変する被測定物であれ
ば特にその被測定対象物は問わないものである。
また、第５図および第６図はフアイバコイル１４
ａ，１４ｂの内側に表面鏡１７や光漏洩用フアイ
バコイル４０等の光入力可動体を配置したが、コ
イル１４ａ，１４ｂの外側又は内側および外側の
両方に配置してもよいものである。 Note that the present invention can be modified in various ways without departing from the gist thereof. That is, in the above embodiment, the detection of the liquid level was described as the object to be measured, but the object to be measured is not particularly limited as long as it is an object to be measured in which the position of the drive shaft 17 is varied.
In addition, FIGS. 5 and 6 show the fiber coil 14.
Although the light input movable bodies such as the surface mirror 17 and the fiber coil 40 for light leakage are arranged inside the coils 14a and 14b, they may be arranged outside the coils 14a and 14b or both inside and outside the coils 14a and 14b.
以上詳記したように本発明によれば、小さな曲
率半径のフアイバコイルの内側および外側の何れ
か一方又は両方に被測定物の位置に応じて可動し
ながら該フアイバコイルの漏洩光を反射して元に
戻し或いは自ら光を倣つて入力する光入力可動体
を配置した構成としたので、特別に電源を用いる
ことなくプロセス量を検出することができる。し
かも、無電源で使用できるので防爆地域の使用に
最適であり、かつ静電誘導や電磁誘導等の影響を
受けないので正確に位置検出できる。また、耐食
性にすぐれている点から種々の液体を取扱うもの
に使用して有用なものである。 As described in detail above, according to the present invention, leakage light from the fiber coil is reflected on one or both of the inside and outside of the fiber coil having a small radius of curvature while moving according to the position of the object to be measured. Since the structure includes a light input movable body that returns the light to the original state or traces the light and inputs the light, the process amount can be detected without using a special power source. Furthermore, since it can be used without a power source, it is ideal for use in explosion-proof areas, and it is not affected by electrostatic induction or electromagnetic induction, so it can accurately detect positions. In addition, it is useful for applications that handle various liquids due to its excellent corrosion resistance.
第１図は光フアイバの回折損失を説明する特性
図、第２図は本発明に係る位置検出器の一実施例
を説明する一部断面にて示す構成図、第３図は第
２図を簡略化した図、第４図ないし第６図は本発
明の他の実施例を説明する構成図である。
１４…フアイバコイル、１４ａ…基準側フアイ
バコイル、１４ｂ…測定側フアイバコイル、１５
…光源、１６…受光素子、１７…駆動軸、１８…
表面鏡、２１…内面鏡、２２…筒体、３０…分岐
器、３１，３４…受光素子、４０…光漏洩用フア
イバコイル、４１…光集合器。
FIG. 1 is a characteristic diagram illustrating the diffraction loss of an optical fiber, FIG. 2 is a partial cross-sectional configuration diagram illustrating an embodiment of a position detector according to the present invention, and FIG. The simplified drawings, FIGS. 4 to 6, are configuration diagrams illustrating other embodiments of the present invention. 14... Fiber coil, 14a... Reference side fiber coil, 14b... Measurement side fiber coil, 15
...Light source, 16... Light receiving element, 17... Drive shaft, 18...
Surface mirror, 21... Inner mirror, 22... Cylindrical body, 30... Brancher, 31, 34... Light receiving element, 40... Fiber coil for light leakage, 41... Light collector.
Claims (1)
されたフアイバコイルと、このフアイバコイルの
内側および外側の何れか一方又は両方に配置さ
れ、被測定物の位置に応じて前記フアイバコイル
と対向面積を変えながら該フアイバコイルに光を
入力する光入力可動体とを備えてなることを特徴
とする位置検出器。 ２ 光入力可動体は、反射鏡で構成しフアイバコ
イルの漏洩光を反射させて該フアイバコイルに入
力するようにした特許請求の範囲第１項記載の位
置検出器。 ３ フアイバコイルは、常時光入力可動体と対向
面積を変えない基準側フアイバコイルと、被測定
物の位置によつて前記光入力可動体と対向面積を
変える測定側フアイバコイルとからなるようにし
た特許請求の範囲第１項記載の位置検出器。 ４ 光入力可動体は曲率半径の小さい漏洩光用フ
アイバコイルで構成した特許請求の範囲第１項又
は第３項記載の位置検出器。[Scope of Claims] 1. A fiber coil formed by winding an optical fiber with a small radius of curvature; A position detector comprising a fiber coil and a light input movable body that inputs light to the fiber coil while changing its facing area. 2. The position detector according to claim 1, wherein the light input movable body is constituted by a reflecting mirror to reflect leaked light from the fiber coil and input the reflected light to the fiber coil. 3. The fiber coil consists of a reference side fiber coil whose area facing the light input movable body does not change at all times, and a measurement side fiber coil whose area facing the light input movable body changes depending on the position of the object to be measured. A position detector according to claim 1. 4. The position detector according to claim 1 or 3, wherein the light input movable body is constituted by a leakage light fiber coil with a small radius of curvature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP810680A JPS56106110A (en) | 1980-01-26 | 1980-01-26 | Position detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP810680A JPS56106110A (en) | 1980-01-26 | 1980-01-26 | Position detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56106110A JPS56106110A (en) | 1981-08-24 |
| JPS6224725B2 true JPS6224725B2 (en) | 1987-05-29 |
Family
ID=11684039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP810680A Granted JPS56106110A (en) | 1980-01-26 | 1980-01-26 | Position detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56106110A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4403152A (en) * | 1981-05-18 | 1983-09-06 | General Electric Company | Optical fiber position sensor |
| JPS58150912A (en) * | 1982-03-04 | 1983-09-07 | Furukawa Electric Co Ltd:The | Photodetector |
-
1980
- 1980-01-26 JP JP810680A patent/JPS56106110A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56106110A (en) | 1981-08-24 |
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