JPH02259548A - Liquid concentration meter - Google Patents
Liquid concentration meterInfo
- Publication number
- JPH02259548A JPH02259548A JP8247589A JP8247589A JPH02259548A JP H02259548 A JPH02259548 A JP H02259548A JP 8247589 A JP8247589 A JP 8247589A JP 8247589 A JP8247589 A JP 8247589A JP H02259548 A JPH02259548 A JP H02259548A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid
- light beam
- light emitting
- concentration
- 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 239000011521 glass Substances 0.000 claims abstract description 28
- 239000007787 solid Substances 0.000 claims abstract description 20
- 230000005611 electricity Effects 0.000 abstract 1
- 230000000644 propagated effect Effects 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 235000015041 whisky Nutrition 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、反射膜が形成されたガラス面を有し、被測定
液体中に配設される検知部と、該検知部に光ビームを出
射する発光部と、前記検知部での反射光を検出する光検
出部とを有し、前記検知部での全反射特性が被測定液体
の濃度値により変化することを利用して被測定液体の濃
度を求める液体濃度計に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention includes a detection section that has a glass surface on which a reflective film is formed and is disposed in a liquid to be measured, and a method for directing a light beam to the detection section. It has a light emitting part that emits light and a light detection part that detects the reflected light from the detection part, and uses the fact that the total reflection characteristic at the detection part changes depending on the concentration value of the liquid to be measured. This invention relates to a liquid concentration meter for determining the concentration of liquid.
（従来の技術）
従来、液体の濃度（体積率）と、その液体の屈折率とは
一定の相関関係があることが知られている。この相関関
係を利用して、第１０図に示すような液体濃度計が用い
られている。(Prior Art) Conventionally, it has been known that there is a certain correlation between the concentration (volume fraction) of a liquid and the refractive index of the liquid. Taking advantage of this correlation, a liquid concentration meter as shown in FIG. 10 is used.
図において、１は第１の光ファイバで、この光ファイバ
ｌの一端部は光分岐器２に接続され、他端部はクラッド
部１ａが剥離され、屈折率がｎ。。In the figure, 1 is a first optical fiber, one end of this optical fiber l is connected to an optical splitter 2, and the other end has a cladding portion 1a peeled off and has a refractive index of n. .
のコア部１ｂが露出され、検知部とされている。The core portion 1b of is exposed and serves as a detection portion.
検知部の露出されたコア部１ｂは湾曲され、先端部には
反射膜１ｃが形成されている。３は検知部１に光ビーム
を出射する発光ダイオードが内蔵された発光部で、第２
の光ファイバ４を介して、光分岐器２に接続されている
。５はフォトセンサが内蔵された光検出部で、第３の光
ファイバ６を介して、光分岐器２に接続されている。そ
して、第１の光ファイバ１の検知部であるコア部１ｂは
、屈折率がｎ、の被測定液体７内に配置される。The exposed core portion 1b of the detection portion is curved, and a reflective film 1c is formed at the tip. 3 is a light emitting part with a built-in light emitting diode that emits a light beam to the detection part 1;
is connected to the optical splitter 2 via an optical fiber 4 . Reference numeral 5 denotes a photodetection section with a built-in photosensor, which is connected to the optical splitter 2 via a third optical fiber 6. The core portion 1b, which is the sensing portion of the first optical fiber 1, is placed in the liquid to be measured 7 having a refractive index of n.
次に、上記構成の動作を説明する。発光部３より出射し
た光ビームは第２の光ファイバ４．光分岐器２を介して
、第１の光ファイバ１のコア部１ｂに達する。ここで、
光フアイバ１中の伝搬モードは多モードなので、一部の
光ビームは測定液体へ透過していくが、残りの光ビーム
は全反射する。Next, the operation of the above configuration will be explained. The light beam emitted from the light emitting section 3 is sent to the second optical fiber 4. It reaches the core portion 1b of the first optical fiber 1 via the optical splitter 2. here,
Since the propagation modes in the optical fiber 1 are multimode, some of the light beams are transmitted to the measurement liquid, while the remaining light beams are totally reflected.
そして、全反射した光ビームは反射膜１ｃで反射し、光
分岐器２で光路が分岐され、第３の光ファイバ６を介し
て、光検出器５のフォトセンサに入射する。Then, the totally reflected light beam is reflected by the reflective film 1c, has an optical path branched by the optical splitter 2, and enters the photosensor of the photodetector 5 via the third optical fiber 6.
上記構成によれば、全反射を起こす光ビームの光量は、
被測定液体７の屈折率ｎ、、の関数となる。According to the above configuration, the amount of light beam that causes total internal reflection is
It is a function of the refractive index n, , of the liquid 7 to be measured.
一方、被測定液体７の濃度と、被測定液体７の屈折率と
は一定の相関関係があるので、全反射を起こす光ビーム
の光量、すなわち、光検出部５内のフォトセンサに入射
する光量を検出することにより、被測定液体７の濃度を
計測することができる。On the other hand, since there is a certain correlation between the concentration of the liquid to be measured 7 and the refractive index of the liquid to be measured 7, the amount of light beam that causes total reflection, that is, the amount of light that enters the photosensor in the photodetector 5 By detecting this, the concentration of the liquid to be measured 7 can be measured.
そして、コア部１ｂの湾曲させる曲率を任意に選定する
ことにより、屈折率がｎ、＜ｎ。。である全ての被測定
液体７の濃度を計測することができる。By arbitrarily selecting the curvature of the core portion 1b, the refractive index becomes n, <n. . It is possible to measure the concentration of all liquids 7 to be measured.
また、この様な構成によれば、電気的火花の発生もなく
、電磁誘導の影響もないので、安全防爆性が要求される
化学プラントなどに好適な液体濃度計を実現できる。Moreover, according to such a configuration, there is no generation of electrical sparks and no influence of electromagnetic induction, so a liquid concentration meter suitable for chemical plants and the like that require safety and explosion-proofness can be realized.
（発明が解決しようとする課踊）
しかし、上記構成の従来例において、検知部として第１
の光ファイバ１を用いているので、検知部がこわれやす
いという問題点がある。また、検知部として用いている
第１の光ファイバ１の径が細いので、発光部３と、光検
出部５とを光ファイバ１の端面に設けることが出来ず、
光分岐器２を介して発光部３と光検出部５とを第１の光
ファイバ１に接続している。よって、構造が複雑になる
という問題点もある。(The lesson to be solved by the invention) However, in the conventional example with the above configuration, the first
Since the optical fiber 1 is used, there is a problem that the detection section is easily broken. Furthermore, since the diameter of the first optical fiber 1 used as the detection section is small, the light emitting section 3 and the light detection section 5 cannot be provided on the end face of the optical fiber 1.
A light emitting section 3 and a light detecting section 5 are connected to a first optical fiber 1 via an optical splitter 2 . Therefore, there is also a problem that the structure becomes complicated.
更に、第１図に示す構成の液体濃度計を実際の製品にす
る場合、第１の光フアイバ１以外は防水性を持たせなけ
ればならないという問題点もある。Furthermore, if the liquid concentration meter having the configuration shown in FIG. 1 is to be made into an actual product, there is also the problem that everything other than the first optical fiber 1 must be made waterproof.
本発明は上記問題点に鑑みてなされたもので、その目的
は、丈夫で、簡単な構造で、防水性にすぐれ、しかも組
立ても容易な液体濃度計を提供することにある。The present invention has been made in view of the above problems, and its object is to provide a liquid concentration meter that is durable, has a simple structure, has excellent waterproof properties, and is easy to assemble.
（課題を解決するための手段）
上記課題を解決する本発明は、反射膜が形成されたガラ
ス面を有し、被測定液体中に配設される検知部と、該検
知部に光ビームを出射する発光部と、前記検知部での反
射光を検出する光検出部とを有し、前記検知部での全反
射特性が被測定液体の濃度値により変化することを利用
して被測定液体の濃度を求める液体濃度計において、透
明物質でなる中実ロッドと、該中実ロッドの先端部に設
けられた検知部と、前記中実ロッドの基端部に一体的に
設けられた発光部及び光検出部と、先端面に前記中実ロ
ッドの基端部が挿通ずる貫通穴が穿設され、内壁面に凹
部が設けられた中空のアウタホルダと、外壁面上に前記
凹部に係合可能な凸部、該凸部が設けられた壁面近傍に
可撓性を持たせる切欠穴、先端部端面に前記一体的に設
けられた発光部及び光検出部を保持する段付き穴が設け
られ、前記アウタホルダに嵌入する中空のインナホルダ
と、前記中実ロッドの基端部近傍に取付けられ、前記ア
ウタホルダ内の防水及び前記中実ロッドの前記アウタホ
ルダからの抜止めを行うＯリングとを有するものである
。(Means for Solving the Problems) The present invention that solves the above problems includes a detection section that has a glass surface on which a reflective film is formed and is disposed in a liquid to be measured, and a light beam that is directed to the detection section. It has a light emitting part that emits light and a light detection part that detects the reflected light from the detection part, and uses the fact that the total reflection characteristic at the detection part changes depending on the concentration value of the liquid to be measured. A liquid concentration meter for determining the concentration of , which includes a solid rod made of a transparent substance, a detection section provided at the tip of the solid rod, and a light emitting section provided integrally at the base end of the solid rod. and a light detection unit, a hollow outer holder having a through hole in the distal end surface through which the base end of the solid rod is inserted, and a hollow outer holder having a recess in the inner wall surface, and a hollow outer holder that can be engaged with the recess in the outer wall surface. a convex portion, a notched hole for providing flexibility near the wall surface where the convex portion is provided, and a stepped hole for holding the light emitting portion and the light detecting portion integrally provided on the end face of the tip portion, It has a hollow inner holder that fits into the outer holder, and an O-ring that is attached near the base end of the solid rod to waterproof the inside of the outer holder and prevent the solid rod from coming out of the outer holder. .
（作用）
本発明の液体濃度計において、発光部より中実ロッドへ
出射する光ビームは、反射面で反射した後センシング部
で全反射し、光検出部に入射する。(Function) In the liquid concentration meter of the present invention, the light beam emitted from the light emitting section to the solid rod is reflected by the reflecting surface, then totally reflected by the sensing section, and then enters the photodetecting section.
（実施例）
次に図面を用いて本発明をアルコール濃度計に用いた一
実施例を説明する。第１図は本発明の一実施例を示す構
成図、第２図は第１図におけるＡ−Ａ断面図、第３図は
第１図においてアウタホルダのみを破断した図、第４図
は第１図に示す濃度計の全体を示す図、第５図は第１図
における濃度測定の原理構成を説明する図、第６図は第
１図における受光出力とアルコール濃度との関係を示す
図、第７図乃至第９図は他の実施例を説明する構成図で
ある。(Example) Next, an example in which the present invention is applied to an alcohol concentration meter will be described with reference to the drawings. Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a cutaway view of only the outer holder in Fig. 1, and Fig. 4 is a cross-sectional view of the 5 is a diagram showing the principle structure of the concentration measurement in FIG. 1, FIG. 6 is a diagram showing the relationship between the received light output and alcohol concentration in FIG. 7 to 9 are configuration diagrams explaining other embodiments.
先ず第５図において、１１は材質が石英で、屈折率がｎ
ａｅの中実のガラスロッドである。このガラスロッド１
１の先端部は検知部として用いられ、端面が軸に対して
角度αで斜めにカットされた所謂、斜切円柱形となって
いる。そして、その端面には、反射膜１１ａがコートさ
れている。ガラスロッド１１の基端側は、後述のホルダ
１２内に固定されている。ガラスロッド１１には発光面
がガラスロッド１１の基端部端面に当接する発光部とし
ての発光ダイオード１３ａと、受光面が同じく基端部端
面に当接する光検出部としてのフォトセンサ１３ｂとが
一体的に設けられた受発光一体素子１３が設けられてい
る。First, in Fig. 5, the material 11 is quartz, and the refractive index is n.
It is a solid glass rod of ae. This glass rod 1
The tip end of No. 1 is used as a detection section, and has a so-called obliquely cut cylindrical shape with an end face cut obliquely at an angle α with respect to the axis. The end face is coated with a reflective film 11a. The proximal end side of the glass rod 11 is fixed within a holder 12, which will be described later. The glass rod 11 is integrated with a light emitting diode 13a as a light emitting part whose light emitting surface is in contact with the end face of the proximal end of the glass rod 11, and a photosensor 13b as a light detecting part whose light receiving surface is also in contact with the end face of the proximal end of the glass rod 11. A light emitting/receiving integrated element 13 is provided.
１４は発光ダイオード１３ａを駆動する発光部駆動装置
、１５はフォトセンサ１３ｂからのアナログ電気信号を
濃度表示信号に変換する濃度測定回路である。１６は濃
度表示信号を表示する表示部（本実施例では発光ダイオ
ード）である。Reference numeral 14 represents a light emitting unit driving device for driving the light emitting diode 13a, and reference numeral 15 represents a concentration measuring circuit that converts an analog electrical signal from the photosensor 13b into a concentration display signal. Reference numeral 16 denotes a display section (a light emitting diode in this embodiment) for displaying a concentration display signal.
そして、ガラスロッド１１は屈折率がｎ、の被測定液体
１７中に配設される。The glass rod 11 is placed in a liquid to be measured 17 having a refractive index of n.
次に第４図において、１８は濃度計本体を収容するケー
スである。このケース１８には発光線駆動回路１４．濃
度測定回路１５２表示部１６が設けられている。Next, in FIG. 4, reference numeral 18 is a case that houses the main body of the concentration meter. This case 18 includes a light emitting line drive circuit 14. A concentration measurement circuit 152 and display section 16 are provided.
次に、第１図乃至第３図を用いてホルダ１２の説明を行
う。２１は先端面にガラスロッド１１の基端部が挿通す
る貫通穴２１ａが穿設され、内壁面に２カ所の凹部２１
ｂが設けられた断面形状が略矩形の中空のアウタホルダ
である。２２は、アウタホルダ２１に嵌入し、外壁面上
にアウタホルダ２１の凹部２１ｂに係合可能な凸部２２
ａが設けられた断面形状が略Ｃ字状のインナホルダであ
る。２２ｂは凸部２２ａの近傍まで切込まれた切欠穴で
ある。この切欠２２ｂ及び断面形状が略Ｃ字状であるこ
とにより、凸部２２ａ近傍の壁面は片持状態となり、第
１図において矢印１方向に可撓可能となっている。２２
ｃは発光一体素子１３が保持される段付き穴である。２
３はガラスロッド１１の基端部近傍に取付けられ、アウ
タホルダ２１内の防水及びガラスロッド１１のアウタホ
ルダ２１からの抜止めを行う０リングである。Next, the holder 12 will be explained using FIGS. 1 to 3. 21 has a through hole 21a in its distal end surface through which the proximal end of the glass rod 11 is inserted, and two recesses 21 in its inner wall surface.
It is a hollow outer holder with a substantially rectangular cross-section provided with b. 22 is a convex portion 22 that fits into the outer holder 21 and can be engaged with the recess 21b of the outer holder 21 on the outer wall surface.
The inner holder has a substantially C-shaped cross section. 22b is a notch hole cut to the vicinity of the convex portion 22a. Since the notch 22b and the cross-sectional shape are substantially C-shaped, the wall surface near the convex portion 22a is in a cantilevered state, and is flexible in the direction of arrow 1 in FIG. 22
c is a stepped hole in which the integrated light emitting element 13 is held. 2
Reference numeral 3 denotes an O-ring that is attached near the base end of the glass rod 11 and serves to waterproof the inside of the outer holder 21 and prevent the glass rod 11 from coming off from the outer holder 21 .
次に、上記構成の動作を説明する。発光ダイオード１３
ａが、発光部駆動装置１４によって駆動され、光ビーム
を出射する。発光ダイオード１３ａより出射した光ビー
ムはガラスロッド１１内を伝搬し、反射膜１１ａで反射
する。光ビームは多モードなので、センシング部分Ａに
て、一部の光ビームは被測定液体１７へ透過していくが
、残りの光ビームは全反射する。そして、全反射した光
ビームはフォトセンサ１３ｂに入射する。Next, the operation of the above configuration will be explained. light emitting diode 13
a is driven by the light emitting unit driving device 14 and emits a light beam. The light beam emitted from the light emitting diode 13a propagates within the glass rod 11 and is reflected by the reflective film 11a. Since the light beam is multimode, part of the light beam is transmitted to the liquid to be measured 17 at the sensing portion A, but the remaining light beam is totally reflected. The totally reflected light beam then enters the photosensor 13b.
フォトセンサ１３ｂに入射した光ビームは、ここでアナ
ログ電気信号に変換される。このアナログ電気信号は、
濃度測定回路１５にて被測定液体１７の濃度表示信号に
変換され、表示部１６にて表示される。The light beam incident on the photosensor 13b is converted into an analog electrical signal here. This analog electrical signal is
It is converted into a concentration display signal of the liquid to be measured 17 by the concentration measurement circuit 15 and displayed on the display section 16.
ここで、上記の構成の装置を下記の条件にて実際に実験
した場合の結果を示す。Here, we will show the results of an actual experiment using the apparatus with the above configuration under the following conditions.
■ガラスロッド１１
材質・・・石英ガラス
大きさ・・・φ３ ＋＋ｎ、長さ３〇−冒α−７９＠
■受発光一体形素子１３
ＴＬＰ９０７（東芝製）
■被測定液体１７
アルコール濃度４０％のウィスキーと水との混合液
■室温・・・２０℃
この様な条件で、受光出力とアルコール濃度との関係を
調べたところ、第６図のような結果を得、両者には直線
的な関係があることが確認された。■Glass rod 11 Material: quartz glass Size: φ3 ++n, length 30-α-79@ ■Receiving/emitting integrated element 13 TLP907 (manufactured by Toshiba) ■Measurement liquid 17 Alcohol concentration 40% Mixed liquid of whiskey and water ■Room temperature: 20℃ Under these conditions, we investigated the relationship between the received light output and the alcohol concentration, and the results shown in Figure 6 were obtained, indicating that there is a linear relationship between the two. It was confirmed that there is.
上記構成によれば、全反射を起こす光ビームの光量は、
被測定液体１７の屈折率ｎ、の関数となる。一方、被測
定液体１７の濃度と、屈折率ｎ。According to the above configuration, the amount of light beam that causes total internal reflection is
It is a function of the refractive index n of the liquid 17 to be measured. On the other hand, the concentration of the liquid to be measured 17 and the refractive index n.
とは一定の相関関係があるので、全反射を起こす光ビー
ムの光量、すなわち、フォトセンサ１３ｂに入射する光
量を検出することにより、被ｎ１定液体１７の濃度を計
測することができる。そして、反射膜１１ａがコートさ
れた端面のカット角度αを任意に選定することにより、
屈折率がｎ−＜ｎ６゜である全ての被測定液体１７の濃
度を計測することができる。Since there is a certain correlation, the concentration of the n1 constant liquid 17 can be measured by detecting the amount of light beam that causes total reflection, that is, the amount of light that is incident on the photosensor 13b. By arbitrarily selecting the cut angle α of the end surface coated with the reflective film 11a,
It is possible to measure the concentration of all liquids 17 to be measured whose refractive index is n-<n6°.
そして、従来例に比べて、検知部としてガラスロッド１
１を用いているので、検知部が丈夫である。また、検知
部として用いているガラスロッド１１の径は太いので、
発光部としての発光ダイオード１３ａと、光検出部とし
てのフォトセンサ１３ｂとが一体的に設けられた受発光
一体素子１３をホルダ１２を介してガラスロッド１１の
端面に設けることができ、構造が簡単となる。And, compared to the conventional example, a glass rod 1 is used as the detection part.
1, the detection part is durable. In addition, since the diameter of the glass rod 11 used as the detection part is large,
The light emitting/receiving integrated element 13, in which the light emitting diode 13a as the light emitting part and the photosensor 13b as the light detecting part are integrally provided, can be provided on the end face of the glass rod 11 via the holder 12, and the structure is simple. becomes.
また、ガラスロッド１１のホルダ１２への取付けは、ア
ウタホルダ２１の貫通穴２１ａにＯリング２３を取付け
たガラスロッド１１を挿入し、インナホルダ２２の基端
部を第１図において矢印１方向の力を加え、凸部２２ａ
が互いに近付く方向に可撓させつつ、アウタホルダ２２
内に嵌入させる。そして、受発光一体素子１３が段付き
穴２２Ｃに保持されるまで嵌入したのち、矢印１方向の
力を解除すると、凸部２２ａはアウタホルダ２１の凹部
２２ａに係合し、取付けは完了する。そして、アウタホ
ルダ２１内の防水はＯリング２３で行うことができる。To attach the glass rod 11 to the holder 12, insert the glass rod 11 with the O-ring 23 attached into the through hole 21a of the outer holder 21, and apply a force in the direction of the arrow 1 in FIG. 1 to the proximal end of the inner holder 22. In addition, the convex portion 22a
The outer holder 22 is bent while the outer holder 22
Insert it inside. After the integrated light receiving and emitting element 13 is fitted into the stepped hole 22C until it is held, when the force in the direction of arrow 1 is released, the convex portion 22a engages with the concave portion 22a of the outer holder 21, and the installation is completed. The interior of the outer holder 21 can be waterproofed using an O-ring 23.
よって、組立てが容易であり、接着剤などを用いないの
で製造時間も少なくてすむ。Therefore, it is easy to assemble, and since no adhesive or the like is used, the manufacturing time can be shortened.
尚、本発明は上記実施例に限るものではない。Note that the present invention is not limited to the above embodiments.
上記実施例では、ガラスロッド１１の先端部を斜切円柱
形としたが、それに限るものではない。例えば、第７図
に示すように、ガラスロッド３１の先端をＶ字形にカッ
トし、カット面に反射膜３１ａを設けても良いし、また
、第８図に示すように、ガラスロッド４１の先端を円錐
状にカットし、カット面に反射膜４１ａを設けても良い
。更に、第９図に示すように、ガラスロッド１１におい
て、光ビームの一部が被測定液体１７へ透過し、残りの
光ビームが全反射する部分Ａ（センシング部分）以外の
ガラス面に、反射コートｌｌｂ （例えば、アルミニウ
ム蒸着）を行ってもよい。こうすることにより、センサ
の性能を向上させることができる。更に、上記実施例に
おいては、凸部と四部がそれぞれ２つの例で説明したが
、１乃至３以上であっても良いし、ホルダの断面形状も
円形であっても良い。In the above embodiment, the tip of the glass rod 11 is shaped like a beveled cylinder, but the shape is not limited thereto. For example, as shown in FIG. 7, the tip of the glass rod 31 may be cut into a V-shape and a reflective film 31a may be provided on the cut surface, or as shown in FIG. It is also possible to cut it into a conical shape and provide the reflective film 41a on the cut surface. Furthermore, as shown in FIG. 9, in the glass rod 11, a part of the light beam is transmitted to the liquid to be measured 17, and the remaining light beam is reflected on the glass surface other than the part A (sensing part) where it is totally reflected. A coating (for example, aluminum vapor deposition) may also be performed. By doing so, the performance of the sensor can be improved. Further, in the above embodiment, the number of the convex portions and the four portions is two, respectively, but the number may be one to three or more, and the cross-sectional shape of the holder may be circular.
（発明の効果）
以上述べたように本発明によれば、透明物質でなる中実
ロッドと、該中実ロッドの先端部に設けられた検知部と
、前記中実ロッドの基端部に一体的に設けられた発光部
及び光検出部と、先端面に前記中実ロッドの基端部が挿
通する貫通穴が穿設され、内壁面に凹部が設けられた中
空のアウタホルダと、外壁面上に前記凹部に係合可能な
凸部、該凸部が設けられた壁面近傍に可撓性を持たせる
切欠穴、先端部端面に前記一体的に設けられた発光部及
び光検出部を保持する段付き穴が設けられ、前記アウタ
ホルダに嵌入する中空のインナホルダと、前記中実ロッ
ドの基端部近傍に取付けられ、前記アウタホルダ内の防
水及び前記中実ロッドの前記アウタホルダからの抜止め
を行うＯリングとを有することにより、丈夫で、簡単な
構造で、防水性にすぐれ、しかも組立ても容易な液体濃
度計を実現できる。(Effects of the Invention) As described above, according to the present invention, a solid rod made of a transparent material, a detection section provided at the distal end of the solid rod, and an integral part at the proximal end of the solid rod are provided. a hollow outer holder whose distal end face is provided with a through hole through which the base end of the solid rod is inserted, and whose inner wall face is provided with a recess; a protrusion that can be engaged with the recess; a cutout hole that provides flexibility near the wall surface where the protrusion is provided; A hollow inner holder is provided with a stepped hole and fits into the outer holder, and an O is attached near the base end of the solid rod to waterproof the inside of the outer holder and prevent the solid rod from coming out of the outer holder. By having a ring, it is possible to realize a liquid concentration meter that is strong, has a simple structure, has excellent waterproofness, and is easy to assemble.
第１図は本発明の一実施例を示す構成図、第２図は第１
図におけるＡ−Ａ断面図、第３図は第１図においてアウ
タホルダのみを破断した図、第４図は第１図に示す濃度
計の全体を示す図、第５図は第１図における濃度測定の
原理構成を説明する図、第６図は第１図における受光出
力とアルコール濃度との関係を示す図、第７図乃至第９
図は他の実施例を説明する構成図、第１０図は従来例を
説明する構成図である。
１・・・第１の光ファイバ
３・・・発光部
５・・・光検出部
７．１９・・・被測定液体
１１．３１．４１・・・ガラスロッド
１１ａ、１２ａ、１３ａ・・・反射膜
１１ｂ・・・反射コート １２・・・ホルダ１３・・
・受発光一体素子 １３ａ・・・発光ダイオ−１３ｂ・
・・フォトセンサ １４・・・発光部駆動装置１５・・
・濃度測定回路 １６・・・表示部１７・・・被測定
液体 ２１・・・アウタホルダ２１ａ・・・貫通穴
２１ｂ・・・四部２２・・・インナホルダ
２２ａ・・・凸部２２ｂ・・・切欠穴 ２２ｃ・
・・段付き穴２３・・・０リング
２・・・光分岐器
４・・・第２の光ファイバ
６・・・第３の光ファイバ
ドFIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
3 is a cutaway view of only the outer holder in Figure 1, Figure 4 is a diagram showing the entire densitometer shown in Figure 1, and Figure 5 is the concentration measurement in Figure 1. 6 is a diagram showing the relationship between the light reception output and alcohol concentration in FIG. 1, and FIGS. 7 to 9 are diagrams explaining the principle configuration of
The figure is a block diagram for explaining another embodiment, and FIG. 10 is a block diagram for explaining a conventional example. 1... First optical fiber 3... Light emitting part 5... Light detecting part 7.19... Liquid to be measured 11.31.41... Glass rods 11a, 12a, 13a... Reflection Film 11b... Reflective coat 12... Holder 13...
・Reception/emission integrated element 13a...Light emitting diode 13b・
... Photo sensor 14 ... Light emitting unit driving device 15 ...
・Concentration measurement circuit 16... Display section 17... Liquid to be measured 21... Outer holder 21a... Through hole 21b... Four parts 22... Inner holder
22a...Protrusion 22b...Notch hole 22c.
...Stepped hole 23...0 ring 2...Optical splitter 4...Second optical fiber 6...Third optical fiber
Claims (1)
設される検知部と、該検知部に光ビームを出射する発光
部と、前記検知部での反射光を検出する光検出部とを有
し、前記検知部での全反射特性が被測定液体の濃度値に
より変化することを利用して被測定液体の濃度を求める
液体濃度計において、 透明物質でなる中実ロッドと、 該中実ロッドの先端部に設けられた検知部と、前記中実
ロッドの基端部に一体的に設けられた発光部及び光検出
部と、 先端面に前記中実ロッドの基端部が挿通する貫通穴が穿
設され、内壁面に凹部が設けられた中空のアウタホルダ
と、 外壁面上に前記凹部に係合可能な凸部、該凸部が設けら
れた壁面近傍に可撓性を持たせる切欠穴、先端部端面に
前記一体的に設けられた発光部及び光検出部を保持する
段付き穴が設けられ、前記アウタホルダに嵌入する中空
のインナホルダと、前記中実ロッドの基端部近傍に取付
けられ、前記アウタホルダ内の防水及び前記中実ロッド
の前記アウタホルダからの抜止めを行うＯリングとを有
することを特徴とする液体濃度計。[Scope of Claims] A detection section having a glass surface on which a reflective film is formed and disposed in a liquid to be measured, a light emitting section that emits a light beam to the detection section, and a light beam reflected by the detection section. A liquid concentration meter that has a light detection section that detects light, and that measures the concentration of the liquid to be measured by utilizing the fact that the total reflection characteristic in the detection section changes depending on the concentration value of the liquid to be measured. a solid rod; a detection section provided at the distal end of the solid rod; a light emitting section and a light detection section integrally provided at the proximal end of the solid rod; A hollow outer holder having a through hole through which the proximal end of the rod is inserted and a recess provided on the inner wall surface, a protrusion on the outer wall surface that can be engaged with the recess, and a wall surface provided with the protrusion. A hollow inner holder that is fitted into the outer holder, and a hollow inner holder that is provided with a cutout hole for providing flexibility in the vicinity and a stepped hole that holds the light emitting part and the light detection part that are integrally provided on the end face of the tip part, and that is fitted into the outer holder. 1. A liquid concentration meter comprising an O-ring attached near a base end of a solid rod to waterproof the inside of the outer holder and prevent the solid rod from coming out of the outer holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8247589A JPH02259548A (en) | 1989-03-31 | 1989-03-31 | Liquid concentration meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8247589A JPH02259548A (en) | 1989-03-31 | 1989-03-31 | Liquid concentration meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02259548A true JPH02259548A (en) | 1990-10-22 |
Family
ID=13775539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8247589A Pending JPH02259548A (en) | 1989-03-31 | 1989-03-31 | Liquid concentration meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02259548A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1444502A2 (en) * | 2001-10-11 | 2004-08-11 | Sentelligence, Inc. | Low-cost on-line and in-line spectral sensors based on solid-state source and detector combinations for monitoring lubricants and functional fluids |
| US7459713B2 (en) | 2003-08-14 | 2008-12-02 | Microptix Technologies, Llc | Integrated sensing system approach for handheld spectral measurements having a disposable sample handling apparatus |
-
1989
- 1989-03-31 JP JP8247589A patent/JPH02259548A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1444502A2 (en) * | 2001-10-11 | 2004-08-11 | Sentelligence, Inc. | Low-cost on-line and in-line spectral sensors based on solid-state source and detector combinations for monitoring lubricants and functional fluids |
| EP1444502A4 (en) * | 2001-10-11 | 2007-05-09 | Sentelligence Inc | Low-cost on-line and in-line spectral sensors based on solid-state source and detector combinations for monitoring lubricants and functional fluids |
| US7339657B2 (en) | 2001-10-11 | 2008-03-04 | Sentelligence, Inc. | Low-cost on-line and in-line spectral sensors based on solid-state source and detectors combinations for monitoring lubricants and functional fluids |
| US7459713B2 (en) | 2003-08-14 | 2008-12-02 | Microptix Technologies, Llc | Integrated sensing system approach for handheld spectral measurements having a disposable sample handling apparatus |
| US7907282B2 (en) | 2003-08-14 | 2011-03-15 | Microptix Technologies, Llc | Integrated sensing module for handheld spectral measurements |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4699511A (en) | Refraction sensor | |
| EP0864089B1 (en) | Optical apparatus for performing an immunoassay | |
| GB2037448A (en) | Optical temperature sensor | |
| JPH07218422A (en) | Rigid tubular lightguide and method and device for measuring light absorption of aqueous liquid sample using lightguide thereof | |
| JPH0676883B2 (en) | Optical sensor device | |
| JP2004513363A (en) | Especially for plasma resonance sensors for biosensor technology | |
| JPH0654293B2 (en) | Optical fiber device and parameter measuring method by the device | |
| KR20060123742A (en) | Optical fiber sensor and measuring device using the same | |
| JPH02259548A (en) | Liquid concentration meter | |
| JPH06288823A (en) | Probe for detecting light under sea level | |
| US5349181A (en) | Fiber optic chemical sensor having specific channel connecting design | |
| JPH08261928A (en) | Turbidity detector | |
| US6721049B1 (en) | Device for efficient light collection from a sample | |
| JPH01248040A (en) | Liquid concentration sensor | |
| JPH0518981A (en) | Gas-liquid two phase flow measurement device | |
| JPH0629725Y2 (en) | Liquid concentration meter | |
| SU1755123A1 (en) | Fiber-optics refractometer | |
| JPS57194324A (en) | Optical temperature measuring device | |
| JP2500995Y2 (en) | Liquid concentration meter | |
| JPS5629146A (en) | Photometric sensor of immersion type | |
| JPS6039794Y2 (en) | Temperature sensor using optical fiber | |
| JPS618648A (en) | Optical fiber detector | |
| JPS551520A (en) | Liquid inspecting device | |
| JPH04198844A (en) | Liquid concentration sensor | |
| JPH09257697A (en) | Surface plasmon resonance sensor apparatus |