JPS63238452A - Optical liquid property measuring apparatus - Google Patents
Optical liquid property measuring apparatusInfo
- Publication number
- JPS63238452A JPS63238452A JP62073263A JP7326387A JPS63238452A JP S63238452 A JPS63238452 A JP S63238452A JP 62073263 A JP62073263 A JP 62073263A JP 7326387 A JP7326387 A JP 7326387A JP S63238452 A JPS63238452 A JP S63238452A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid
- reflected
- half mirror
- prism
- 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 26
- 230000003287 optical effect Effects 0.000 title claims description 13
- 238000005259 measurement Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000004575 stone Substances 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〕 本発明は光学式液質測定装置に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an optical liquid quality measuring device.
従来の光学式液質測定装置（例えば比重計など）は、光
源から発した光を光ファイバで、測定対象の液体の測定
個所（例えば液面）まで導き、測定個所を通った光を検
出することにより、液質測定を行っている。Conventional optical liquid quality measurement devices (such as hydrometers) guide light emitted from a light source through an optical fiber to the measuring point (for example, the liquid surface) of the liquid being measured, and detect the light that passes through the measuring point. The liquid quality is measured by this.
上述し・た従来の光学式液質測定装置は、光路として光
ファイバを使用しているため、光ファイバの曲げにより
偏光特性変化などの影響を直接受け、また光源の光量変
化も直接受けるなど、測定結果の変動を生じ易く測定が
不能になるケースが多いという欠点がある。The conventional optical liquid quality measuring device mentioned above uses an optical fiber as the optical path, so it is directly affected by changes in polarization characteristics due to bending of the optical fiber, as well as changes in the light intensity of the light source. The drawback is that measurement results tend to fluctuate, making measurement impossible in many cases.
本発明の装置は、光源がら発した光を導く入射光路と、
該入射光路からの入射光の一部を透過して測定対象の液
体との接触面に導き且つ前記入射光の一部を反射して前
記液体の外方に導くハーフミラ−を内部に設けたプリズ
ムと、前記ハーフミラ−の透過光の前記接触面での反射
光および前記ハーフミラ−での反射光をそれぞれ検出す
る第１および第２の光検出器と、該両光検出器の各検出
信号の差信号を発生する差動回路とを、備えている。The device of the present invention includes an incident optical path for guiding light emitted from a light source;
a prism provided with a half mirror inside that transmits a part of the incident light from the incident optical path and guides it to a contact surface with the liquid to be measured, and reflects a part of the incident light and guides it to the outside of the liquid; a first and a second photodetector that respectively detect the reflected light of the transmitted light of the half mirror on the contact surface and the reflected light of the half mirror; and a difference between detection signals of the two photodetectors. and a differential circuit that generates a signal.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例を示すブロック図である。同
図において、光源１より発信された光は、光ファイバ２
を通って、測定対象の液体８の表面に下面を接触しであ
るプリズム３の上面に到達する。プリズム３の内部に入
った光は、例えば貼合わせ加工等によってプリズム３の
内部に仕組まれたハーフミラ−４に達し、表面で反射す
る光と、透過する光とに、二分される。ハーフミラ−４
の表面で反射した光は、参照光として使用するためなプ
リズム３から取出し、光ファイバ２を通して光検知器５
に入力する。一方、ハーフミラ−４を透過した光はプリ
ズム３と液体８との接触面で一部反射し、一部は液体８
内に透過していく。この反射光を参照光と同様にプリズ
ム３から取出し、光ファイバ２を通して光検知器６に入
力する。光検出器５および６の各出力信号の差を差動増
幅器７でとると、差動増幅器４の出力信号は、光源１の
光量ドリフトや光路状態（光ファイバ２の曲げなど〉の
影響による偏光などに起因する出力変動を相殺したもの
となる。従って、この差動増幅器７の出力信号を分析処
理することにより、安定で高精度の液質測定結果を得る
ことができる。FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, light emitted from a light source 1 is transmitted through an optical fiber 2.
The prism 3 reaches the upper surface of the prism 3 with its lower surface in contact with the surface of the liquid 8 to be measured. The light that has entered the interior of the prism 3 reaches a half mirror 4 installed inside the prism 3 by, for example, laminating processing, and is divided into light that is reflected on the surface and light that is transmitted. Half mirror 4
The light reflected on the surface of
Enter. On the other hand, part of the light transmitted through the half mirror 4 is reflected by the contact surface between the prism 3 and the liquid 8, and part of the light is reflected by the liquid 8.
It penetrates inside. This reflected light is extracted from the prism 3 in the same way as the reference light and is input to the photodetector 6 through the optical fiber 2. When the difference between the output signals of the photodetectors 5 and 6 is taken by the differential amplifier 7, the output signal of the differential amplifier 4 is polarized due to the influence of the light intensity drift of the light source 1 and the optical path condition (bending of the optical fiber 2, etc.). This cancels out output fluctuations caused by such factors.Therefore, by analyzing and processing the output signal of the differential amplifier 7, stable and highly accurate liquid quality measurement results can be obtained.
以上説明したように本発明は、プリズム内にハーフミラ
−を組込んでおきハーフミラ−で反射した参照光とハー
フミラ−を透過し液体面で反射した検知対象光との差を
検出することにより、光源及び光路中の原因による出力
変動を相殺でき従来よりも安定で精度が高い光学式液質
測定装置を実用化できるという効果がある。As explained above, the present invention incorporates a half mirror into the prism and detects the difference between the reference light reflected by the half mirror and the detection target light transmitted through the half mirror and reflected by the liquid surface. Also, output fluctuations caused by causes in the optical path can be canceled out, and an optical liquid quality measuring device that is more stable and accurate than the conventional one can be put into practical use.
第１図は本発明の一実施例を示すブロック図である。
１・・・光源、２・・・光ファイバ、３・・・プリズム
、４・・・ハーフミラ−１５・・・光検出器、６・・・
光検出器、７・・・比較器、８・・・液体。
石１図FIG. 1 is a block diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Light source, 2... Optical fiber, 3... Prism, 4... Half mirror 15... Photodetector, 6...
Photodetector, 7... Comparator, 8... Liquid. stone 1 diagram
Claims (1)
入射光の一部を透過して測定対象の液体との接触面に導
き且つ前記入射光の一部を反射して前記液体の外方に導
くハーフミーラーを内部に設けたプリズムと、前記ハー
フミーラーの透過光の前記接触面での反射光および前記
ハーフミラーでの反射光をそれぞれ検出する第１および
第２の光検出器と、該両光検出器の各検出信号の差信号
を発生する差動回路とを、備えていることを特徴とする
光学式液質測定回路。An incident optical path that guides light emitted from a light source; a part of the incident light from the incident optical path is transmitted and guided to the contact surface with the liquid to be measured; and a part of the incident light is reflected to the outside of the liquid. a prism having a half-mirror therein that guides the half-mirror toward the surface; first and second photodetectors that respectively detect the reflected light of the transmitted light of the half-mirror on the contact surface and the reflected light of the half-mirror; An optical liquid quality measurement circuit comprising: a differential circuit that generates a difference signal between detection signals of both photodetectors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62073263A JPS63238452A (en) | 1987-03-26 | 1987-03-26 | Optical liquid property measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62073263A JPS63238452A (en) | 1987-03-26 | 1987-03-26 | Optical liquid property measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63238452A true JPS63238452A (en) | 1988-10-04 |
Family
ID=13513114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62073263A Pending JPS63238452A (en) | 1987-03-26 | 1987-03-26 | Optical liquid property measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63238452A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06341897A (en) * | 1990-10-09 | 1994-12-13 | Internatl Business Mach Corp <Ibm> | Electronic-signal-noise suppression system |
| WO2003060458A1 (en) * | 2002-01-17 | 2003-07-24 | Agilent Technologies, Inc. | Determination of optical properties of a device under test in both directions in transmission and in reflection |
-
1987
- 1987-03-26 JP JP62073263A patent/JPS63238452A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06341897A (en) * | 1990-10-09 | 1994-12-13 | Internatl Business Mach Corp <Ibm> | Electronic-signal-noise suppression system |
| WO2003060458A1 (en) * | 2002-01-17 | 2003-07-24 | Agilent Technologies, Inc. | Determination of optical properties of a device under test in both directions in transmission and in reflection |
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