JP2006300772A - Instrument and method for measuring cleanliness of tube inner wall face - Google Patents

Instrument and method for measuring cleanliness of tube inner wall face Download PDF

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JP2006300772A
JP2006300772A JP2005123851A JP2005123851A JP2006300772A JP 2006300772 A JP2006300772 A JP 2006300772A JP 2005123851 A JP2005123851 A JP 2005123851A JP 2005123851 A JP2005123851 A JP 2005123851A JP 2006300772 A JP2006300772 A JP 2006300772A
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wall surface
optical fiber
tube
irradiation
light
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JP4686245B2 (en
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Hiroaki Ishizawa
広明 石澤
Kunihisa Nakamura
邦久 中村
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Sakura Seiki Co Ltd
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Sakura Seiki Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an instrument and a method for measuring cleanliness of a tube inner wall face, which detect invisible contamination on a tube inner wall face. <P>SOLUTION: This instrument is provided with: an optical cable constituted of an optical fiber for irradiation inserted into a tube and for carrying irradiation light for irradiating the tube inner wall face, and an optical fiber for photoreception for carrying reflected light from the tube inner wall face; a columnar member attached to one end part of the optical fiber, and formed with a plurality of through holes 15 inserted with the respective one-end parts of the optical fibers along an outer circumferential edge; a cone mirror formed into a tapered reflecting face with an outside diameter expanded along a separating direction of the reflecting face separated from a tip face of the columnar member, so as to reflect the irradiation light emitted from the optical fiber for the irradiation toward tube inner wall face direction and also so as to reflect the reflected light from the inner wall face toward the optical fiber for the photoreception, when fixed onto the tip face of the columnar member and inserted into the tube; a light source 20 for the irradiation light carried by the optical fiber for the irradiation, in the other end part of the optical fiber; and a detector for detecting the reflected light carried by the optical fiber for the photoreception, in the other end part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は管内壁面清浄度測定装置及び管内壁面清浄度測定方法に関し、更に詳細には管内壁面の目視で観察され難い汚れを検知して管内壁面の清浄程度を判定する管内壁面清浄度測定装置及び管内壁面清浄度測定方法に関する。   The present invention relates to a pipe inner wall surface cleanliness measuring apparatus and a pipe inner wall surface cleanness measuring method, and more specifically, a pipe inner wall surface cleanliness measuring apparatus that detects dirt that is difficult to visually observe on the pipe inner wall surface and determines the degree of cleanliness of the pipe inner wall surface, and The present invention relates to a method for measuring the cleanliness of a wall surface in a pipe.

医療器具に用いられる種々の細管は再生利用されるものが多い。かかる細管内には、その耐熱性等の観点から蒸気滅菌できないものがあり、この様な細管は洗浄されて再生利用が図られている。
しかし、近年、再生利用を図る細管では、その洗浄程度を保証することが求められつつある。
かかる洗浄程度を保証するには、細管の内壁面の洗浄程度を測定することが必要である。このため、細管の内壁面を内視鏡で観察することによって、目視できる汚れを見出すことはできる。
しかしながら、洗浄保証を充分に行なうためには、管内壁面の目視できない汚れを検知することが必要である。
このため、下記特許文献１には、図５に示す管内壁面清浄度測定装置を用いて管内壁面の目視できない汚れを検知することが提案されている。
この図５の管内壁面清浄度測定装置には、管１００内に挿入される光ケーブル１０２の一端部に円錐状のプリズム１０４が装着され、光ケーブル１０２の他端部には、光ケーブル１０２で搬送されてプリズム１０４によって管１００の内壁面方向に照射される赤外線の光源１０６と、管１００の内壁面で反射されてプリズム１０４及び光ケーブル１０２によって搬送された反射光を検知する検出器１０８とが設けられている。
特表２００１−５０５３０３号公報（図１、図２） Many of the various capillaries used in medical instruments are recycled. Some of these capillaries cannot be steam sterilized from the viewpoint of their heat resistance and the like, and such capillaries are cleaned and reused.
However, in recent years, it has been demanded to guarantee the degree of cleaning of thin tubes intended for recycling.
In order to guarantee the degree of cleaning, it is necessary to measure the degree of cleaning of the inner wall surface of the thin tube. For this reason, it is possible to find visible dirt by observing the inner wall surface of the thin tube with an endoscope.
However, in order to ensure sufficient cleaning, it is necessary to detect invisible stains on the inner wall surface of the pipe.
For this reason, in Patent Document 1 below, it is proposed to detect invisible stains on the inner wall surface of the tube using the inner wall surface cleanliness measuring apparatus shown in FIG.
5 has a conical prism 104 attached to one end portion of an optical cable 102 inserted into the tube 100, and is conveyed by the optical cable 102 to the other end portion of the optical cable 102. An infrared light source 106 irradiated by the prism 104 toward the inner wall surface of the tube 100 and a detector 108 that detects reflected light reflected by the inner wall surface of the tube 100 and conveyed by the prism 104 and the optical cable 102 are provided. Yes.
JP-T-2001-505303 (FIGS. 1 and 2)

図５に示す管内壁面清浄度測定装置によれば、管１００の内壁面からの反射光のスペクトルを観察し、特定の吸収が見られなかった場合には、汚れなしとして洗浄保証できる。
一方、反射光のスペクトルに特定の吸収が見られた場合には、その特定の吸収に対応する汚れが残存するとして再度の洗浄を施し、再度、管内壁面清浄度測定装置による精浄度を測定して、特定の吸収が見られなかった場合には、汚れなしとして洗浄保証できる。
この様に、洗浄保証がされた内壁面の汚れが充分に落とされた管のみを洗浄保証できる。
しかしながら、図５に示す管内壁面清浄度測定装置では、光ケーブル１０２の一端面に円錐状のプリズム１０４の底面を密着して装着することは困難である。
更に、空気と屈折率の異なるガラスによって形成されているプリズム１０４を照射光及び反射光が通過するため、屈折率の異なる材料間を通過することに因る光の減衰が発生して感度が低下するおそれがある。
また、図５に示す管内壁面清浄度測定装置を管内に挿入する際に、円錐状のプリズム１０４の尖っている先端部が管内壁面と衝突して、柔らかい管の場合は、管内壁面を損傷したり、硬い管の場合は、プリズム１０４の先端部が損傷されたりするおそれもある。
そこで、本発明の課題は、プリズムを用いることなく管内壁面の目視できない汚れを検知し得る管内壁面清浄度測定装置及び管内壁面清浄度測定方法を提案することにある。 According to the pipe inner wall surface cleanliness measuring apparatus shown in FIG. 5, the spectrum of the reflected light from the inner wall surface of the pipe 100 is observed, and if no specific absorption is observed, it can be guaranteed that there is no dirt.
On the other hand, if specific absorption is observed in the spectrum of reflected light, it is washed again as dirt corresponding to the specific absorption remains, and the purity of the pipe inner wall surface cleanliness measuring device is measured again. If no specific absorption is observed, it can be guaranteed that there is no contamination.
In this way, it is possible to guarantee that only the pipes on which the dirt on the inner wall surface that has been guaranteed to be cleaned has been sufficiently removed.
However, in the pipe inner wall surface surface cleanliness measuring apparatus shown in FIG. 5, it is difficult to attach the bottom surface of the conical prism 104 in close contact with one end surface of the optical cable 102.
Furthermore, since the irradiation light and the reflected light pass through the prism 104 formed of glass having a refractive index different from that of air, the light is attenuated due to passing between materials having different refractive indexes, and the sensitivity is lowered. There is a risk.
In addition, when the pipe inner wall cleanliness measuring apparatus shown in FIG. 5 is inserted into the pipe, the sharp tip of the conical prism 104 collides with the pipe inner wall, and in the case of a soft pipe, the pipe inner wall is damaged. In the case of a hard tube, the tip of the prism 104 may be damaged.
Accordingly, an object of the present invention is to propose a pipe inner wall surface cleanliness measuring apparatus and a pipe inner wall surface cleanliness measuring method capable of detecting invisible stains on the pipe inner wall without using a prism.

本発明者等は、前記課題を達成するには、光ケーブルから照射される照射光を管内壁面方向に反射し、管内壁面からの反射光を光ケーブル方向に反射する反射面を具備する部材を設けることが有効であると考え検討した結果、本発明に到達した。
すなわち、本発明は、管内壁面の目視で観察され難い汚れを検知して管内壁面の清浄程度を判定する管内壁面清浄度測定装置において、該管内に挿入可能であって、前記管内壁面に照射する特定の照射光を搬送する照射用光ファイバと、前記管内壁面からの反射光を搬送する受光用光ファイバとから構成される光ケーブルと、前記光ケーブルの一端部に装着され、外周縁に沿って前記光ファイバの各一端部が挿入されている複数本の貫通孔が形成された柱状部材と、前記柱状部材の先端面に固着されて前記管内に挿入されたとき、前記照射用光ファイバから照射される照射光を管内壁面方向に反射し、前記管内壁面からの反射光を前記受光用ファイバに反射するように、反射面が前記柱状部材の先端面から離れる方向に外径が拡大するテーパ状反射面に形成されたコーンミラーと、前記光ケーブルの他端部には、前記照射用光ファイバによって搬送される照射光の光源と、前記受光用光ファイバによって搬送された反射光を検出する検出手段とが設けられていることを特徴とする管内壁面清浄度測定装置にある。
また、本発明は、管内壁面の目視で観察され難い汚れを検知して管内壁面の清浄程度を判定する際に、前述した管内壁面清浄度測定装置を用いて、前記汚れを検知することを特徴とする管内壁面清浄度測定方法でもある。 In order to achieve the above object, the present inventors provide a member having a reflecting surface that reflects the irradiation light emitted from the optical cable toward the inner wall surface of the tube and reflects the reflected light from the inner wall surface of the tube toward the optical cable. As a result, the present invention has been reached.
That is, the present invention is an apparatus for measuring the cleanliness of the inner wall surface of a tube that detects dirt that is difficult to visually observe on the inner wall surface of the tube, and determines the degree of cleanliness of the inner wall surface of the tube. An optical cable composed of an irradiating optical fiber that conveys specific irradiating light, and a light receiving optical fiber that conveys reflected light from the inner wall surface of the tube, and is attached to one end of the optical cable, along the outer peripheral edge A columnar member formed with a plurality of through-holes into which one end of each optical fiber is inserted, and when irradiated into the tube after being fixed to the tip end surface of the columnar member, the optical fiber for irradiation is irradiated. The reflecting surface has a taper whose outer diameter expands in a direction away from the front end surface of the columnar member so that the reflected light from the inner wall surface of the tube is reflected toward the inner wall surface of the tube and the reflected light from the inner wall surface of the tube is reflected to the receiving fiber. A cone mirror formed on a reflection surface, a light source of irradiation light conveyed by the irradiation optical fiber at the other end of the optical cable, and a detecting means for detecting reflected light conveyed by the light receiving optical fiber Are provided in the pipe inner wall surface surface cleanliness measuring device.
Further, the present invention is characterized by detecting the dirt using the above-described pipe inner wall surface cleanliness measuring device when detecting the dirt that is difficult to be visually observed on the inner wall surface of the pipe and determining the degree of cleanliness of the inner wall surface of the pipe. It is also a pipe inner wall surface cleanliness measuring method.

かかる本発明において、コーンミラーの反射面を金によって形成することにより、反射面の反射率を高くできる。
このコーンミラーを、柱状部材の先端面から突出する突出部にネジ止めすることによって、確実に且つ容易に柱状部材にコーンミラーを固着できる。
更に、柱状部材には、照射用光ファイバと受光用光ファイバとを交互に配設することによって、管内壁面に万遍無く光源からの照射光を照射でき、管内壁面からの反射光を万遍無く受光できる。
また、光源としては、赤外線用光源を好適に用いることができる。 In this invention, the reflectance of a reflective surface can be made high by forming the reflective surface of a cone mirror with gold | metal | money.
The cone mirror can be securely and easily fixed to the columnar member by screwing the cone mirror to the protruding portion protruding from the front end surface of the columnar member.
Furthermore, the columnar member can be irradiated with light from the light source evenly on the inner wall surface of the tube by arranging the irradiating optical fiber and the receiving optical fiber alternately, and the reflected light from the inner wall surface of the tube is universal. It can receive light without.
As the light source, an infrared light source can be suitably used.

本発明に係る管内壁面清浄度測定装置によれば、外周縁に沿って光ファイバの各一端部が挿入されている複数本の貫通孔が形成された柱状部材が光ケーブルの一端部に装着されている。このため、柱状部材の一端部側にコーンミラーを容易に装着できる。
このコーンミラーの反射面は、柱状部材の先端面から離れる方向に外径が拡大するテーパ状反射面に形成されており、光ケーブルを構成する照射用光ファイバから照射される照射光を管内壁面方向に反射し、この管内壁面からの反射光を光ケーブルの受光用光ファイバに反射する。
かかる受光用光ファイバによって搬送される反射光を検出器で検出し、汚れによる吸収の有無を検知することによって、管内壁面の汚れの有無を知ることができる。更に、管内壁面に汚れが残存している場合、汚れの吸収程度を測定することによって、汚れの程度、更には汚れ量まで知ることができる。
この様に、本発明に係る管内壁面清浄度測定装置では、コーンミラーの反射面で照射光及び反射光を所定方向に反射しているため、プリズムで光路を変更している場合の如く、照射光及び反射光が空気と屈折率の異なる材料間を通過することに因る光の減衰が発生するおそれを解消できる。
更に、光ケーブルの一端部に装着されたコーンミラーは、柱状部の先端面から離れる方向に外径が拡大するテーパ状であるため、管内に挿入したときでも、先端部が管内壁面に衝突して管内壁面を損傷することやコーンミラーが損傷されるおそれも解消できる。 According to the pipe inner wall surface surface cleanliness measuring apparatus according to the present invention, the columnar member in which a plurality of through holes into which one end portions of the optical fibers are inserted along the outer peripheral edge is attached to one end portion of the optical cable. Yes. For this reason, a cone mirror can be easily mounted on one end side of the columnar member.
The reflection surface of the cone mirror is formed as a tapered reflection surface whose outer diameter increases in a direction away from the tip surface of the columnar member, and the irradiation light irradiated from the irradiation optical fiber constituting the optical cable is directed toward the inner wall surface of the tube. The reflected light from the inner wall surface of the tube is reflected to the light receiving optical fiber of the optical cable.
By detecting the reflected light carried by the light receiving optical fiber with a detector and detecting the presence or absence of absorption due to dirt, the presence or absence of dirt on the inner wall surface of the tube can be known. Furthermore, when dirt remains on the inner wall surface of the pipe, the degree of dirt and the amount of dirt can be determined by measuring the degree of dirt absorption.
As described above, in the pipe inner wall surface surface cleanliness measuring apparatus according to the present invention, the irradiation light and the reflected light are reflected in the predetermined direction by the reflection surface of the cone mirror, so that the irradiation is performed as in the case where the optical path is changed by the prism. It is possible to eliminate the possibility of light attenuation due to light and reflected light passing between materials having different refractive indexes from air.
Furthermore, the cone mirror attached to one end of the optical cable has a tapered shape whose outer diameter increases in a direction away from the tip surface of the columnar portion, so that the tip portion collides with the inner wall surface of the tube even when inserted into the tube. The possibility of damaging the inner wall surface of the tube and damaging the cone mirror can also be eliminated.

本発明に係る管内壁面清浄度測定装置の一例を図１に示す。図１の管内壁面清浄度測定装置には、管１０内に挿入される光ケーブル１２の一端部に柱状部材１４が装着されており、柱状部材１４の先端面側にコーンミラー１６が装着されている。この柱状部材１４と光ケーブル１２との接合境界部の外周面には、テープ１８が巻回されている。
かかる光ケーブル１２の他端部には、光ケーブル１２で搬送されてコーンミラー１６によって管１０の内壁面方向に照射される赤外線の光源２０とマイケルソン干渉計２２とが設けられていると共に、管１０の内壁面で反射されてコーンミラー１６及び光ケーブル１２によって搬送された反射光を検出する検出器２４が設けられている An example of the pipe inner wall surface surface cleanliness measuring apparatus according to the present invention is shown in FIG. 1 has a columnar member 14 attached to one end of an optical cable 12 inserted into the tube 10, and a cone mirror 16 attached to the distal end side of the columnar member 14. . A tape 18 is wound around the outer peripheral surface of the boundary between the columnar member 14 and the optical cable 12.
The other end of the optical cable 12 is provided with an infrared light source 20 and a Michelson interferometer 22 which are conveyed by the optical cable 12 and irradiated by the cone mirror 16 toward the inner wall surface of the tube 10. A detector 24 is provided for detecting the reflected light reflected by the inner wall surface and conveyed by the cone mirror 16 and the optical cable 12.

光ケーブル１２の一端部に装着された柱状部材１４は、アルミニウムによって形成されており、図２に示す様に、外周縁に沿って光ケーブル１２を構成する複数本の光ファイバの各一端部が挿入される貫通孔１５が形成されている。かかる貫通孔１５の各々は、図３に示す様に、光源２０からの光をマイケルソン干渉計２２で干渉して干渉光とした照射光を搬送する照射用光ファイバ１２ａと、管１０の内壁面からの反射光を検出器２４に搬送する受光用光ファイバ１２ｂとの各一端部が交互に挿入されている。この様に、照射用光ファイバ１２ａと受光用光ファイバ１２ｂとの各一端部を交互に配設することによって、管１０の内壁面に万遍無く光源からの照射光を照射でき、管１０の内壁面からの反射光を万遍無く受光できる。
この柱状部材１４の先端面側には、図２及び図３に示す様に、先端部にネジ部が形成された突出部１４ａが突設されており、この突出部１４ａにアルミニウム製のコーンミラー１６が装着されている。 The columnar member 14 attached to one end of the optical cable 12 is made of aluminum, and each one end of a plurality of optical fibers constituting the optical cable 12 is inserted along the outer periphery as shown in FIG. A through hole 15 is formed. As shown in FIG. 3, each of the through holes 15 includes an irradiation optical fiber 12 a that conveys irradiation light that interferes with light from the light source 20 by a Michelson interferometer 22, and an inner tube 10. One ends of the light receiving optical fiber 12b that conveys reflected light from the wall surface to the detector 24 are alternately inserted. In this way, by alternately disposing each end of the irradiation optical fiber 12a and the light receiving optical fiber 12b, the inner wall surface of the tube 10 can be irradiated with the irradiation light from the light source evenly. The light reflected from the inner wall can be received evenly.
As shown in FIGS. 2 and 3, a protruding portion 14a having a threaded portion formed at the distal end is projected on the distal end surface side of the columnar member 14, and an aluminum cone mirror is formed on the protruding portion 14a. 16 is mounted.

コーンミラー１６は、柱状部材１４の先端面から離れる方向に外径が拡大するテーパ状部１６ａと円柱部１６ｂとから成り、その中央部に貫通孔１７に形成されている。
かかるコーンミラー１６は、テーパ状部１６ａの先端が柱状部材１４の先端面に当接するように、その貫通孔１７内に柱状部材１４の突出部１４ａを挿入し、コーンミラー１６の円柱部１６ｂの端面から突出部１４ａの一端部を突出する。この突出部１４ａの先端部には、ネジが設けられているため、円柱部１６ｂの端面から突出する突出部１４ａの一端部にナット１９を螺着することによって、コーンミラー１６を柱状部材１４に容易に且つ確実に固着できる。
かかるコーンミラー１６のテーパ状部１６ａのテーパ面１６ｃは、薄膜状の金膜（図示せず）から成る反射面に形成されている（以下、コーンミラー１６のテーパ面１６ｃを単に反射面１６ｃと称することがある）。この金膜は蒸着によって形成されたものである。この様に、反射面１６ｃを金で形成することにより、反射面１６ｃの反射率を高くできる。
この反射面１６ｃは、テーパ状部１６ａのテーパ面に形成されているため、柱状部材１４の先端面から離れる方向に外径が拡大するテーパ状の反射面である。 The cone mirror 16 includes a tapered portion 16a and a columnar portion 16b whose outer diameter increases in a direction away from the distal end surface of the columnar member 14, and is formed in the through hole 17 at the center thereof.
The cone mirror 16 is configured such that the protruding portion 14a of the columnar member 14 is inserted into the through hole 17 so that the tip of the tapered portion 16a abuts on the tip surface of the columnar member 14, and the columnar portion 16b of the cone mirror 16 is inserted. One end of the protruding portion 14a protrudes from the end surface. Since a screw is provided at the distal end portion of the projecting portion 14a, the cone mirror 16 is attached to the columnar member 14 by screwing a nut 19 into one end portion of the projecting portion 14a projecting from the end surface of the cylindrical portion 16b. It can be easily and reliably fixed.
The tapered surface 16c of the tapered portion 16a of the cone mirror 16 is formed as a reflective surface made of a thin gold film (not shown) (hereinafter, the tapered surface 16c of the cone mirror 16 is simply referred to as the reflective surface 16c). Sometimes called). This gold film is formed by vapor deposition. Thus, the reflectance of the reflective surface 16c can be increased by forming the reflective surface 16c with gold.
Since the reflecting surface 16c is formed on the tapered surface of the tapered portion 16a, the reflecting surface 16c is a tapered reflecting surface whose outer diameter increases in a direction away from the tip surface of the columnar member 14.

図１〜図３に示す管内壁面清浄度測定装置によれば、光源２０からの光をマイケルソン干渉計２２で干渉光とした照射光は、光ケーブル１２内の照射用光ファイバ１２ａ，１２ａ・・によって搬送され、管１０内に挿入された柱状部材１４の先端面からコーンミラー１６のテーパ状の反射面１６ｃに照射される。テーパ状の反射面１６ｃに照射された照射光は、反射面１６ｃによって反射されて管１０の内壁面方向に照射される。
管１０の内壁面方向に照射された照射光は、管１０の内壁面からコーンミラー１６のテーパ状の反射面１６ｃに向けて反射され、光ケーブル１２内の受光用光ファイバ１２ｂ，１２ｂ・・によって検出器２４に搬送される。 1 to 3, the irradiation light obtained by using the light from the light source 20 as interference light by the Michelson interferometer 22 is applied to the irradiation optical fibers 12a, 12a,. The tapered reflecting surface 16c of the cone mirror 16 is irradiated from the front end surface of the columnar member 14 that is transported by and inserted into the tube 10. Irradiation light applied to the tapered reflecting surface 16 c is reflected by the reflecting surface 16 c and is applied toward the inner wall surface of the tube 10.
Irradiated light irradiated in the direction of the inner wall surface of the tube 10 is reflected from the inner wall surface of the tube 10 toward the tapered reflecting surface 16c of the cone mirror 16, and is received by the light receiving optical fibers 12b, 12b,. It is conveyed to the detector 24.

図１〜図３に示す管内壁面清浄度測定装置を用い、アルミ管の内壁面に豚脂を付着したモデル実験をした。
このモデル実験では、光源２０からの赤外光をマイケルソン干渉計２２によって干渉光とした照射光を用い、光ケーブル１２として、カルコゲナイトガラスが用いられた光フィアイバから構成される光ケーブルを用いた。
更に、アルミ管への豚脂の付着は、０．０８ｍｇの豚脂を溶解したヘキサン（豚脂濃度１％）中に、アルミ管を１分間浸漬した後、アルミ管を取り出して５分間放置してヘキサンを揮発させた。
次いで、豚脂を付着したアルミ管内に、図１に示す光ケーブル１２の一端部に装着した柱状部材１４の先端面側に固着したコーンミラー１６を挿入し、光源２０からの赤外光をマイケルソン干渉計２２によって干渉光とした照射光を、光ケーブル１２内の照射用光ファイバ１２ａ，１２ａ・・によって搬送し、コーンミラー１６のテーパ状の反射面１６ｃによって反射してアルミ管の内壁面方向に照射する。
アルミ管の内壁面方向に照射した照射光のうち、アルミ管の内壁面からの反射光は、コーンミラー１６のテーパ状の反射面１６ｃで反射して、光ケーブル１２内の受光用光ファイバ１２ｂ，１２ｂ・・によって検出器２４に搬送し、反射光のスペクトル分析をする。
検出器２４によって検出した波長１０００〜３５００ｃｍ-1の領域における吸光度を図４の曲線Ｔとして示す。図４には、豚脂付着前のアルミ管の内壁面ついて測定した波長１０００〜３５００ｃｍ-1の領域における吸光度も曲線Ｓとして示す。
図５から明らかな様に、曲線Ｔでは、曲線Ｓに対して波長２９２０ｃｍ-1、２８５０ｃｍ-1、１７５０ｃｍ-1、１４６０ｃｍ-1及び１１６０ｃｍ-1の近傍に特有な吸収が表れる。このため、かかる吸収が表れるアルミ管では、その内壁面が脂肪分で汚れていることが判る。また、かかる吸収の強度を測定することによって、その汚れの程度、更には汚れ量も知ることができる。 Using a pipe inner wall surface cleanliness measuring apparatus shown in FIGS. 1 to 3, a model experiment was conducted in which pork fat was adhered to the inner wall surface of an aluminum pipe.
In this model experiment, irradiation light obtained by using infrared light from the light source 20 as interference light by the Michelson interferometer 22 was used, and an optical cable composed of an optical fiber using chalcogenite glass was used as the optical cable 12. .
Furthermore, the adhesion of pork fat to the aluminum tube was obtained by immersing the aluminum tube in hexane (1% pork fat concentration) in which 0.08 mg of pork fat was dissolved, then removing the aluminum tube and leaving it for 5 minutes. Hexane was volatilized.
Next, a cone mirror 16 fixed to the tip end side of the columnar member 14 attached to one end of the optical cable 12 shown in FIG. 1 is inserted into the aluminum tube to which pork fat is adhered, and the infrared light from the light source 20 is Michelson. Irradiation light converted into interference light by the interferometer 22 is conveyed by the irradiation optical fibers 12a, 12a,... In the optical cable 12, reflected by the tapered reflecting surface 16c of the cone mirror 16, and directed toward the inner wall surface of the aluminum tube. Irradiate.
Of the irradiation light irradiated in the direction of the inner wall surface of the aluminum tube, the reflected light from the inner wall surface of the aluminum tube is reflected by the tapered reflecting surface 16c of the cone mirror 16 to receive the optical fibers 12b for receiving light in the optical cable 12. 12b,... To the detector 24 for spectral analysis of the reflected light.
The absorbance in the region of wavelength 1000 to 3500 cm −1 detected by the detector 24 is shown as a curve T in FIG. In FIG. 4, the absorbance in the region of wavelength 1000 to 3500 cm −1 measured for the inner wall surface of the aluminum tube before adhering pork fat is also shown as curve S.
As apparent from FIG. 5, the curve T, wavelength 2920 cm -1 with respect to the curve S, 2850 cm -1, 1750 cm -1, appears is specific absorption in the vicinity of 1460 cm -1 and 1160 cm -1. For this reason, in the aluminum tube which shows such absorption, it turns out that the inner wall surface is dirty with fat. Further, by measuring the intensity of such absorption, the degree of contamination and the amount of contamination can be known.

この様に、汚れのない細管内壁面についての赤外吸収スペクトルと、洗浄後の細管内壁面の赤外吸収スペクトルとを比較することによって、洗浄後した細管の内壁面が汚れているか否かを判定できる。また、汚れの特有の吸収程度によって、その汚れの程度、更には汚れ量も推定可能である。
以上の説明で用いた管内壁面清浄度測定装置を構成する柱状部材１４及びコーンミラー１６を共にアルミニウムによって形成しているが、樹脂によって形成してもよい。 In this way, by comparing the infrared absorption spectrum of the clean inner wall surface of the thin tube with the infrared absorption spectrum of the inner wall surface of the cleaned thin tube, it is determined whether or not the inner wall surface of the cleaned thin tube is dirty. Can be judged. Further, the degree of dirt and the amount of dirt can be estimated by the specific absorption degree of dirt.
Although the columnar member 14 and the cone mirror 16 constituting the pipe inner wall surface cleanliness measuring apparatus used in the above description are both made of aluminum, they may be made of resin.

本発明に係る管内壁面清浄度測定装置を説明するための概略図である。It is the schematic for demonstrating the pipe inner wall surface cleanliness measuring apparatus which concerns on this invention. 図１に示す柱状部材及びコーンミラーの構成を説明する部分断面図である。It is a fragmentary sectional view explaining the structure of the columnar member and cone mirror shown in FIG. 図１に示す柱状部材の側面図である。It is a side view of the columnar member shown in FIG. 図１に示す管内壁面清浄度測定装置を用いて測定した赤外吸収スペクトルの一例を示すグラフである。It is a graph which shows an example of the infrared absorption spectrum measured using the pipe inner wall surface cleanliness measuring apparatus shown in FIG. 従来の管内壁面清浄度測定装置を説明するための概略図である。It is the schematic for demonstrating the conventional pipe wall surface cleanliness measuring apparatus.

符号の説明Explanation of symbols

１０ 管
１２ 光ケーブル
１２ａ 照射用光ファイバ
１２ｂ 受光用光ファイバ
１４ 柱状部材
１４ａ 突出部
１５，１７ 貫通孔
１６ コーンミラー
１６ａ テーパ状部
１６ｂ 円柱部
１６ｃ テーパ面（反射面）
１９ ナット
２０ 光源
２２ マイケルソン干渉計
２４ 検出器
DESCRIPTION OF SYMBOLS 10 Tube 12 Optical cable 12a Irradiation optical fiber 12b Receiving optical fiber 14 Columnar member 14a Protrusion part 15 and 17 Through-hole 16 Cone mirror 16a Tapered part 16b Cylindrical part 16c Tapered surface (reflection surface)
19 Nut 20 Light source 22 Michelson interferometer 24 Detector

Claims (6)

管内壁面の目視で観察され難い汚れを検知して管内壁面の清浄程度を判定する管内壁面清浄度測定装置において、
該管内に挿入可能であって、前記管内壁面に照射する特定の照射光を搬送する照射用光ファイバと、前記管内壁面からの反射光を搬送する受光用光ファイバとから構成される光ケーブルと、
前記光ケーブルの一端部に装着され、外周縁に沿って前記光ファイバの各一端部が挿入されている複数本の貫通孔が形成された柱状部材と、
前記柱状部材の先端面に固着されて前記管内に挿入されたとき、前記照射用光ファイバから照射される照射光を管内壁面方向に反射し、前記管内壁面からの反射光を前記受光用ファイバに反射するように、反射面が前記柱状部材の先端面から離れる方向に外径が拡大するテーパ状反射面に形成されたコーンミラーと、
前記光ケーブルの他端部には、前記照射用光ファイバによって搬送される照射光の光源と、前記受光用光ファイバによって搬送された反射光を検出する検出手段とが設けられていることを特徴とする管内壁面清浄度測定装置。 In the pipe inner wall surface cleanliness measuring device that detects dirt that is difficult to visually observe on the pipe inner wall surface and determines the degree of cleanness of the pipe inner wall surface,
An optical cable that can be inserted into the tube, and that includes an irradiation optical fiber that conveys specific irradiation light that irradiates the inner wall surface of the tube, and an optical fiber that receives reflected light from the inner wall surface of the tube;
A columnar member that is attached to one end of the optical cable and has a plurality of through holes into which one end of the optical fiber is inserted along the outer periphery.
When the columnar member is fixed to the distal end surface of the columnar member and inserted into the tube, the irradiation light irradiated from the irradiation optical fiber is reflected toward the inner wall surface of the tube, and the reflected light from the inner wall surface of the tube is reflected to the light receiving fiber. A cone mirror formed on a tapered reflecting surface whose outer diameter expands in a direction away from the tip surface of the columnar member so as to reflect,
The other end portion of the optical cable is provided with a light source of irradiation light carried by the irradiation optical fiber and a detecting means for detecting reflected light carried by the light receiving optical fiber. Pipe inner wall surface cleanliness measuring device. コーンミラーの反射面が金によって形成されている請求項１記載の管内壁面清浄度測定装置。   The pipe inner wall surface cleanliness measuring apparatus according to claim 1, wherein the reflection surface of the cone mirror is formed of gold. コーンミラーが、柱状部材の先端面から突出する突出部にネジ止めされて固着されている請求項１又は請求項２記載の管内壁面清浄度測定装置。 The pipe inner wall surface surface cleanliness measuring apparatus according to claim 1 or 2, wherein the cone mirror is screwed and fixed to a protruding portion protruding from the tip end surface of the columnar member. 柱状部材には、照射用光ファイバと受光用光ファイバとが交互に配設されている請求項１〜３のいずれか一項記載の管内壁面清浄度測定装置。   The pipe wall surface cleanliness measuring device according to any one of claims 1 to 3, wherein the columnar member is alternately provided with an optical fiber for irradiation and an optical fiber for light reception. 光源が、赤外線用光源である請求項１〜４のいずれか一項記載の管内壁面清浄度測定装置。   The inner wall surface cleanliness measuring device according to any one of claims 1 to 4, wherein the light source is an infrared light source. 管内壁面の目視で観察され難い汚れを検知して管内壁面の清浄程度を判定する際に、請求項１〜５のいずれか一項記載の管内壁面清浄度測定装置を用いて、前記汚れを検知することを特徴とする管内壁面清浄度測定方法。   When detecting the dirt which is hard to be visually observed on the inner wall surface of the pipe and determining the degree of cleanliness of the inner wall surface of the pipe, the dirt is detected using the inner wall surface cleanliness measuring device according to any one of claims 1 to 5. A method for measuring the cleanliness of a pipe inner wall surface.
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