JP6913799B2 - Spectral analyzer and spectroscopic analysis method - Google Patents

Description

The present disclosure relates to a spectroscopic analyzer and a spectroscopic analysis method.

A spectrophotometer is known in which a sensor is inserted inside a pipe or the like and can continuously measure the concentration of a component to be measured contained in a liquid inside the pipe or the like.
For example, in Patent Document 1, a light emitting / receiving unit including a light source and a light receiving element is attached to a tower tank or a pipe, and a sensor is inserted inside the tower tank or the pipe to be inside the tower tank or the pipe. A spectrophotometer that can continuously measure the concentration of uranium, plutonium, etc. contained in a liquid is disclosed.

Jikkai Sho 63-51261

When arranging a light source or a light receiving element of a spectrophotometer near a pipe or the like in which a liquid containing a radioactive element such as uranium or plutonium exists, it is necessary to take measures such as shielding the radiation.
However, Patent Document 1 does not disclose measures against radiation.

In view of the above circumstances, at least one embodiment of the present invention aims to provide a spectroscopic analyzer in which measures against radiation are provided. Further, at least one embodiment of the present invention provides a spectroscopic analyzer capable of performing spectroscopic analysis by switching the optical path length of the light from the light source in the liquid while the measuring unit is immersed in the liquid. The purpose.

(1) The spectroscopic analyzer according to at least one embodiment of the present invention is
A measuring probe having a measuring part immersed in a liquid,
Light source and
With the detector
An irradiation optical fiber that irradiates the liquid with light from the light source,
A light-receiving optical fiber that receives light irradiated to the liquid via the irradiation optical fiber and guides the light to the detector.
The measuring unit includes a reflecting member that reflects the light emitted from the irradiation optical fiber.
Of a plurality of types of optical paths in which at least one of the position of the tip surface of the irradiation optical fiber, the position of the reflection surface of the reflection member, or the position of the tip surface of the light receiving optical fiber is different from each other, the light path is guided to the detector. By providing an optical path length selection unit configured to select an optical path through which the emitted light should pass, the optical path length of the light from the light source in the liquid while the measuring unit is immersed in the liquid. It is configured so that it can be analyzed by switching.

(2) In some embodiments, in the configuration of (1) above,
At least one of the irradiation optical fiber and the light receiving optical fiber includes a plurality of optical fibers.
The plurality of optical fibers are
A first fiber having the tip surface at the first position in the extending direction of the optical fiber,
A second fiber having the tip surface at a second position different from the first position in the extending direction of the optical fiber,
including.

(3) In some embodiments, in the configuration of (1) above, the reflective member has a plurality of reflective surfaces whose positions in the extending direction of the irradiation optical fiber or the light receiving optical fiber are different from each other. ..

(4) The spectroscopic analyzer according to at least one embodiment of the present invention is
A measuring probe having a measuring part immersed in a liquid,
Light source and
With the detector
An irradiation optical fiber that irradiates the liquid with light from the light source,
A light-receiving optical fiber that receives light irradiated to the liquid via the irradiation optical fiber and guides the light to the detector.
The measuring unit includes a reflecting member that reflects the light emitted from the irradiation optical fiber.
By changing at least one of the position of the tip surface of the irradiation optical fiber, the position of the reflection surface of the reflection member, or the position of the tip surface of the light receiving optical fiber, the liquid of light from the light source. By including the optical path length adjusting unit for adjusting the optical path length in the inside, the optical path length can be switched and analyzed while the measuring unit is immersed in the liquid.

(5) In some embodiments, in the configuration of (4) above, the optical path length adjusting unit uses the irradiation optical fiber or the light receiving optical fiber at least one of the irradiation optical fibers in the measurement probe. Alternatively, the optical path length is adjusted by moving the light receiving optical fiber along the extending direction.

(6) In some embodiments, in the configuration of (4) above, the optical path length adjusting unit extends the reflecting surface of the reflecting member in the measuring probe to the irradiation optical fiber or the light receiving optical fiber. The optical path length is adjusted by moving along the current direction.

(7) The spectroscopic analysis method according to at least one embodiment of the present invention
The step of immersing the measuring part of the measuring probe in the liquid to be analyzed,
A step of guiding the light from the light source to the measurement probe via an optical fiber for irradiation and irradiating the liquid in the measurement unit with the light.
A step of receiving the light irradiated to the liquid via a light receiving optical fiber and guiding the light to the detector.
A step of analyzing the liquid based on the light received by the light receiving optical fiber, and
When the signal level of the light detection signal of the light receiving optical fiber is out of the specified range, the position of the tip surface of the irradiation optical fiber, the position of the reflecting surface of the reflecting member of the measuring unit, or the light receiving. A state in which the measuring unit is immersed in the liquid by selecting an optical path through which light guided to the detector should pass from among a plurality of types of optical paths in which at least one of the positions of the tip surfaces of the optical fiber is different from each other. With the step of switching the optical path length of the light from the light source in the liquid,
To be equipped.

(8) The spectroscopic analysis method according to at least one embodiment of the present invention
The step of immersing the measuring part of the measuring probe in the liquid to be analyzed,
A step of guiding the light from the light source to the measurement probe via an optical fiber for irradiation and irradiating the liquid in the measurement unit with the light.
A step of receiving the light irradiated to the liquid via a light receiving optical fiber, and a step of receiving the light.
A step of analyzing the liquid based on the light received by the light receiving optical fiber, and
When the signal level of the light detection signal of the light receiving optical fiber is out of the specified range, the position of the tip surface of the irradiation optical fiber, the position of the reflecting surface of the reflecting member of the measuring unit, or the light receiving. By changing at least one of the positions of the tip surface of the optical fiber to adjust the optical path length of the light from the light source in the liquid, the measuring unit remains immersed in the liquid. Steps to switch the optical path length and
To be equipped.

Further, the spectroscopic analyzer according to another embodiment is
A measuring probe immersed in a solution containing radioactive material in a high dose area,
Light source and
With the detector
An irradiation optical fiber that guides the light from the light source to the measurement probe,
A light receiving optical fiber that guides the light from the measuring probe to the detector.
The light source and the detector are installed in a low dose area where the air dose rate is lower than that in the high dose area.

In the spectroanalyzer having the above configuration, the measurement probe immersed in the solution containing radioactive substances is installed in the high dose area, and the light source and detector are installed in the low dose area where the air dose rate is lower than that in the high dose area. NS. This enables spectroscopic analysis by suppressing the influence of radiation on the light source and the detector.
In addition, by installing detectors, etc. that are easily affected by radiation in low-dose areas, it is possible to simplify measures against radiation such as detectors, or if the dose in low-dose areas is low, no special measures are taken. It also improves, and the cost increase can be suppressed.

In another embodiment, the light source and the detector have a shielding layer that shields radiation.

According to the above configuration, since the light source and the detector have a shielding layer that shields the radiation, the influence of the radiation on the light source and the detector can be further suppressed and spectroscopic analysis can be performed.

In yet another embodiment, a flexible metal tube is further provided that covers at least a portion of the irradiation optical fiber and the light receiving optical fiber that exists within the high dose area.

According to the above configuration, at least the portion of the irradiation optical fiber and the light receiving optical fiber existing in the high dose area is covered with a flexible metal tube, so that a relatively high dose in the high dose area can be obtained. The influence of radiation on the irradiation optical fiber and the light receiving optical fiber can be suppressed, and the durability of the irradiation optical fiber and the light receiving optical fiber can be improved. Further, since the metal tube has flexibility, it does not hinder the bending of the irradiation optical fiber and the light receiving optical fiber.

In another embodiment, the irradiation optical fiber, the light receiving optical fiber, and the metal tube are interposed between the irradiation optical fiber, the light receiving optical fiber, and the inner peripheral surface of the metal tube. Further protective members are provided to prevent contact.

According to the above configuration, for example, even if the irradiation optical fiber and the light receiving optical fiber are bent together with the metal tube, the protective member prevents the irradiation optical fiber and the light receiving optical fiber from coming into contact with the inner peripheral surface of the metal tube. Therefore, the durability of the irradiation optical fiber and the light receiving optical fiber can be improved.

In another embodiment, the protective member is a member made of graphite or a resin having radiation resistance.

According to the above configuration, since the protective member is made of graphite or a resin member having radiation resistance, the durability of the protective member is improved even in a high dose area, so that the protective member is an optical fiber for irradiation and light receiving. Contact between the optical fiber for irradiation and the inner peripheral surface of the metal tube can be prevented for a long period of time, and the durability of the optical fiber for irradiation and the optical fiber for light reception can be improved.

In another embodiment, the member is made of any one of a polyimide resin, a PEEK resin, and a polyamide resin.

According to the above configuration, the radiation resistance of the protective member is improved by forming the protective member with any of polyimide resin, PEEK resin, and polyamide resin, so that the irradiation optical fiber and the light receiving optical fiber can be appropriately protected. , The durability of the irradiation optical fiber and the light receiving optical fiber can be improved.

In another embodiment, the protective member is a granular material filled between the irradiation optical fiber and the light receiving optical fiber and the inner peripheral surface of the metal tube.

According to the above configuration, when the granular material filled between the irradiation optical fiber and the light receiving optical fiber and the inner peripheral surface of the metal tube bends the irradiation optical fiber and the light receiving optical fiber together with the metal tube. By moving appropriately, the force applied to the irradiation optical fiber and the light receiving optical fiber from the granules at the time of bending is dispersed, so that the irradiation optical fiber and the light receiving optical fiber can be appropriately protected, and the irradiation optical fiber and the light receiving optical fiber can be appropriately protected. The durability of the optical fiber for use can be improved.

In another embodiment, the protective member extends in a direction intersecting the extending direction of the irradiation optical fiber and the light receiving optical fiber, and hits the irradiation optical fiber and the light receiving optical fiber. It is a rod-shaped or plate-shaped member that is in contact with the inner peripheral surface of the metal tube to prevent contact between the irradiation optical fiber and the light receiving optical fiber and the inner peripheral surface of the metal tube.

According to the above configuration, since the irradiation optical fiber and the light receiving optical fiber can be protected by the protective member having a simple structure of rod shape or plate shape, the durability of the protective member is high. As a result, the irradiation optical fiber and the light receiving optical fiber can be protected for a long period of time.

In another embodiment, the protective member is a covering member that covers the outer surfaces of the irradiation optical fiber and the light receiving optical fiber.

According to the above configuration, since the outer surface of the irradiation optical fiber and the light receiving optical fiber is covered with the coating member, even if the irradiation optical fiber and the light receiving optical fiber are bent together with the metal tube, the irradiation optical fiber and the light receiving light are received. Since the covering member prevents the contact between the outer surface of the fiber and the inner peripheral surface of the metal tube, the durability of the irradiation optical fiber and the light receiving optical fiber can be improved.

In another embodiment, at least a part of the structural material of the measuring probe is made of a radiation-resistant resin.

According to the above configuration, even when a resin is used for at least a part of the structural material of the measurement probe, the resin has radiation resistance, so that the irradiation optical fiber and the light receiving optical fiber can be appropriately protected. The durability of the irradiation optical fiber and the light receiving optical fiber can be improved.

In another embodiment, the resin is any one of a polyimide resin, a PEEK resin, and a polyamide resin.

According to the above configuration, the irradiation optical fiber and the light receiving optical fiber can be appropriately formed by forming at least a part of the structural material of the measurement probe with any of the radiation resistant polyimide resin, PEEK resin, and polyamide resin. It can be protected and the durability of the irradiation optical fiber and the light receiving optical fiber can be improved.

In another embodiment, the measurement probe can be analyzed by switching the optical path length of the light from the light source in the solution while being immersed in the solution.

According to the above configuration, the optical path length of the light from the light source in the solution can be switched and analyzed while the measurement probe is immersed in the solution, so that the measurement probe is inserted in a pipe or the like. However, it is not necessary to remove the measurement probe from the piping or the like. This eliminates the need for preparations for the worker to enter the high-dose area, reduces the man-hours of the worker, and enables rapid spectroscopic analysis of a solution having a large concentration fluctuation range.

Further, the spectroscopic analyzer according to another embodiment is
A measuring probe having a measuring part immersed in a liquid,
Light source and
With the detector
An irradiation optical fiber that irradiates the liquid with light from the light source,
A light-receiving optical fiber that receives light irradiated to the liquid via the irradiation optical fiber and guides the light to the detector.
The measuring unit is configured to be able to analyze by switching the optical path length of the light from the light source in the liquid while being immersed in the liquid.

According to the above configuration, the optical path length of the light from the light source in the liquid can be switched and analyzed while the measuring unit is immersed in the liquid, so that even when the measuring probe is inserted in a pipe or the like. , There is no need to remove the measurement probe from the piping. As a result, for example, since it is not necessary for the worker to go to the place where the measurement probe is installed in the facility, the man-hours of the worker can be reduced and the spectroscopic analysis can be performed quickly on the solution having a large concentration fluctuation range. In particular, it is derived from distance reasons such as the installation location of the measurement probe being far away, accessibility reasons such as the installation location of the measurement probe being narrow, work environment reasons such as ambient temperature, and the properties of the liquid. This is useful when there is a reason, such as a reason, that it is not easy to remove the measurement probe from the pipe or the like.
Even when the spectroscopic analyzer is a portable device and the spectroscopic analysis is performed at the destination of the spectroscopic analyzer, the optical path length can be switched without the operator touching the measuring unit immersed in the liquid. Be done. As a result, the measurement range of the spectroscopic analyzer can be easily changed regardless of the properties of the liquid, which is highly convenient.

In other embodiments,
The measuring unit includes a reflecting member that reflects the light emitted from the irradiation optical fiber.
Of a plurality of types of optical paths in which at least one of the position of the tip surface of the irradiation optical fiber, the position of the reflection surface of the reflection member, or the position of the tip surface of the light receiving optical fiber is different from each other, the light path is guided to the detector. It is provided with an optical path length selection unit configured to select an optical path through which the emitted light should pass.

According to the above configuration, the detector is among a plurality of types of optical paths in which at least one of the position of the tip surface of the irradiation optical fiber, the position of the reflection surface of the reflecting member, or the position of the tip surface of the light receiving optical fiber is different from each other. Since the optical path length selection unit configured to select the optical path through which the light guided to the light path should pass is provided, the optical path length can be easily changed. As a result, the measurement range of the spectroscopic analyzer can be changed quickly, and the efficiency of the analysis work is improved.

In other embodiments,
At least one of the irradiation optical fiber and the light receiving optical fiber includes a plurality of optical fibers.
The plurality of optical fibers are
A first fiber having the tip surface at the first position in the extending direction of the optical fiber,
A second fiber having the tip surface at a second position different from the first position in the extending direction of the optical fiber,
including.

According to the above configuration, by making the positions of the tip surfaces of the first fiber and the second fiber different, it is possible to easily form a plurality of types of optical paths different from each other.

In another embodiment, the reflective member has a plurality of reflective surfaces whose positions in the extending direction of the irradiation optical fiber or the light receiving optical fiber are different from each other.

According to the above configuration, since the reflecting member has a plurality of reflecting surfaces having different positions in the extending direction of the irradiation optical fiber or the light receiving optical fiber, it is possible to easily form a plurality of types of optical paths different from each other.

In other embodiments,
The measuring unit includes a reflecting member that reflects the light emitted from the irradiation optical fiber.
The optical path length can be adjusted by changing at least one of the position of the tip surface of the irradiation optical fiber, the position of the reflection surface of the reflection member, or the position of the tip surface of the light receiving optical fiber. Includes an optical path length adjustment unit.

According to the above configuration, the optical path length is adjusted by changing at least one of the position of the tip surface of the irradiation optical fiber, the position of the reflection surface of the reflecting member, or the position of the tip surface of the light receiving optical fiber. Since the optical path length adjusting unit is included, the optical path length can be easily changed. As a result, the measurement range of the spectroscopic analyzer can be changed quickly, and the efficiency of the analysis work is improved.

In another embodiment, the optical path length adjusting unit sets at least one of the irradiation optical fiber or the light receiving optical fiber in the measuring probe along the extending direction of the irradiation optical fiber or the light receiving optical fiber. The optical path length is adjusted by moving the optical path.

According to the above configuration, the optical path length adjusting unit moves at least one of the irradiation optical fiber and the light receiving optical fiber in the measurement probe along the extending direction of the irradiation optical fiber or the light receiving optical fiber, thereby causing the optical path length. It is possible to switch to a plurality of different optical path lengths without increasing the number of optical fibers, the number of optical fibers inserted into the measurement probe can be suppressed, and the radial size of the measurement probe can be suppressed. ..

In another embodiment, the optical path length adjusting unit moves the reflective surface of the reflective member in the measuring probe along the extending direction of the irradiation optical fiber or the light receiving optical fiber, thereby causing the optical path length. To adjust.

According to the above configuration, the optical path length adjusting unit adjusts the optical path length by moving the reflective surface of the reflecting member in the measurement probe along the extending direction of the irradiation optical fiber or the light receiving optical fiber. It is possible to switch to a plurality of different optical path lengths without increasing the number of optical fibers, the number of optical fibers inserted into the measurement probe can be suppressed, and the radial size of the measurement probe can be suppressed.

Further, the spectroscopic analysis method according to another embodiment is
The step of immersing the measuring part of the measuring probe in the liquid to be analyzed,
A step of guiding the light from the light source to the measurement probe via an optical fiber for irradiation and irradiating the liquid in the measurement unit with the light.
A step of receiving the light irradiated to the liquid via a light receiving optical fiber, and a step of receiving the light.
A step of analyzing the liquid based on the light received by the light receiving optical fiber, and
When the signal level of the light detection signal of the light receiving optical fiber is out of the specified range, the optical path length of the light from the light source in the liquid is determined while the measuring unit is immersed in the liquid. Steps to switch and
To be equipped.

According to the above method, when the signal level of the light detection signal of the light receiving optical fiber is out of the specified range, the optical path length of the light from the light source in the liquid is determined while the measuring unit is immersed in the liquid. Since it can be switched, it is not necessary to remove the measurement probe from the pipe or the like even when the measurement probe is inserted into the pipe or the like. As a result, for example, since it is not necessary for the worker to go to the place where the measurement probe is installed in the facility, the man-hours of the worker can be reduced and the spectroscopic analysis can be performed quickly on the solution having a large concentration fluctuation range. In particular, it is derived from distance reasons such as the installation location of the measurement probe being far away, accessibility reasons such as the installation location of the measurement probe being narrow, work environment reasons such as ambient temperature, and the properties of the liquid. This is useful when there is a reason why it is not easy to remove the measurement probe from the pipe or the like.
In addition, the optical path length can be switched without the worker touching the measuring unit immersed in the liquid. As a result, the measurement range of the spectroscopic analyzer can be easily changed regardless of the properties of the liquid, which is highly convenient.

According to at least one embodiment of the present invention, spectroscopic analysis can be performed by suppressing the influence of radiation on the spectroscopic analyzer. Further, according to at least one embodiment of the present invention, spectroscopic analysis can be performed by switching the optical path length of the light from the light source in the liquid while the measuring unit is immersed in the liquid.

It is a figure which shows an example of the usage form of the spectroscopic analyzer of some embodiments schematically. It is an external view of the measurement probe of some embodiments. It is a schematic cross-sectional view of the optical fiber cable of some embodiments. It is a schematic cross-sectional view of the optical fiber cable of some embodiments. It is a schematic cross-sectional view of the optical fiber cable of some embodiments. It is a schematic cross-sectional view of the optical fiber cable of some embodiments. 2 is a schematic cross-sectional view of the vicinity of the measuring portion of the measuring probe of some embodiments shown in FIG. 2, and FIG. 2A is a view showing a cross section cut along the extending direction of the optical fiber in the measuring probe. (B) is a cross-sectional view taken along the line AA in (a). It is a schematic cross-sectional view in the vicinity of the measurement part of the measurement probe of some embodiments shown in FIG. It is an external view of the measurement probe of some embodiments. 9 is a schematic cross-sectional view of the vicinity of the measuring portion of the measuring probe of one embodiment shown in FIG. 9, FIG. 9A is a diagram showing an example of a state in which the optical path length is set to a certain length, and FIG. 9B is a diagram showing an example. It is a figure which shows an example of the case where the optical path length is made shorter than the state shown in (a). It is a schematic cross-sectional view of the vicinity of the measurement part of the measurement probe which concerns on the modification, (a) is the figure which shows an example of the state which set the optical path length to a certain length, (b) is the figure (a). It is a figure which shows an example of the case where the optical path length is made longer than the shown state.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, and are merely explanatory examples. do not have.
For example, expressions that represent relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a state of relative displacement with tolerances or angles and distances to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, an expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or chamfering within a range in which the same effect can be obtained. The shape including the part and the like shall also be represented.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions that exclude the existence of other components.

FIG. 1 is a diagram schematically showing an example of usage of the spectroscopic analyzer of some embodiments. The spectroscopic analyzer 1 of some embodiments is a so-called probe-type spectroscopic analyzer, and the analyzer main body 10 and the measurement probe 100 are connected by an optical fiber cable 20.
The spectroscopic analyzer 1 of some embodiments is for measuring the concentration of radioactive substances such as uranium and plutonium in the liquid inside pipes and towers online in a nuclear facility such as a nuclear fuel reprocessing plant. Used for.

Of the spectroscopic analyzer 1, the measurement probe 100 is attached to pipes and tower tanks in a nuclear facility in a high dose area 91 having a relatively high air dose rate. In the example shown in FIG. 1, the measurement probe 100 is attached to a pipe 80 through which a liquid containing a radioactive substance such as uranium or plutonium flows in a nuclear facility.
Of the spectroscopic analyzer 1, the analyzer main body 10 is installed in the low dose area 92, which has a lower air dose rate than the high dose area 91. Specifically, the analyzer main body 10 is installed in a control room or the like.

(Analyzer body 10)
In some embodiments, the analyzer body 10 comprises a light source 11, a spectroscope 12, an optical path length selection unit 13, and a detector 14 arranged in a region surrounded by a shielding plate 15 in the housing. It has. Since the light source 11, the spectroscope 12, and the detector 14 have known configurations as spectroscopic analyzers, description thereof will be omitted.

The optical path length selection unit 13 is a switch for selecting which of the plurality of optical paths having different optical path lengths in the measurement probe 100, which will be described in detail later, to guide the light passing through the optical path to the detector 14. Specifically, in some embodiments shown in FIG. 2 to be described later, the measurement probe 100 is configured to be capable of outputting light passing through, for example, three optical paths having different optical path lengths. Then, three optical fiber cables 20 that transmit light passing through three optical paths having different optical path lengths in the measurement probe 100 are connected to the analyzer main body 10. The optical path length selection unit 13 outputs the light from one of the three optical fiber cables 20 selected by the user or automatically selected by the user to the detector 14.

The shielding plate 15 is a plate-shaped member made of a material having a high effect of shielding radiation, such as lead. By surrounding the detector 14 and the like, which are easily affected by radiation, with the shielding plate 15, the influence of radiation can be further suppressed.
When the dose in the low dose area is low, the shielding plate 15 may not be provided.

(About the outline of the measurement probe 100)
2 and 9 are external views of the measurement probe 100 of some embodiments. In some embodiments, the measuring probe 100 has a tubular tubular portion 101 and a flange portion 102 attached to the tubular portion 101.
In the measurement probe 100 of some embodiments shown in FIG. 2, the inside of the tubular portion 101 is made into a liquid via an irradiation optical fiber 110 that irradiates the liquid with light from the light source 11 and an irradiation optical fiber 110. Optical fibers 120, 130, and 140 for receiving light that receive the irradiated light are arranged. Similarly, in the measurement probe 100 of the embodiment shown in FIG. 9, the inside of the tubular portion 101 is a liquid via an irradiation optical fiber 210 that irradiates the liquid with light from the light source 11 and an irradiation optical fiber 210. A light receiving optical fiber 220 that receives the light radiated to the light source is arranged.
A reflecting mirror 103 that reflects the light emitted from the irradiation optical fibers 110 and 210 is arranged inside the tip side of the tubular portion 101, that is, inside the right end side in FIGS. 2 and 9.

The tips of the optical fibers 110 to 140, 210, 220 and the reflector 103 are separated from each other. An opening 101a is provided in the tip portion 101c of the tubular portion 101, and an external liquid can flow in the space between the tips of the optical fibers 110 to 140, 210, 220 and the reflector 103. That is, the space between the tips of the optical fibers 110 to 140, 210, 220 and the reflecting mirror 103 is the distribution chamber 101b through which the liquid to be measured flows.
The measuring unit 105 of the measuring probe 100 of some embodiments shown in FIG. 2 includes each optical fiber 110 to 140, a reflecting mirror 103, and a tip portion 101c of a tubular portion 101 forming a distribution chamber 101b. The measuring unit 105 of the measuring probe 100 of one embodiment shown in FIG. 9 includes optical fibers 210 and 220, a reflecting mirror 103, and a tip portion 101c.
The measurement probe 100 of some embodiments shown in FIG. 2 is provided with three optical paths having different optical path lengths, which will be described in detail later.
Further, the optical path length can be adjusted in the measurement probe 100 of one embodiment shown in FIG. 9, but the details will be described later.

In the measurement probe 100 of some embodiments shown in FIGS. 2 and 9, the measurement probe 100 has a flange portion 102 coupled to a flange provided in a pipe or a tower tank to which the measurement probe 100 is attached. It is fixed to pipes and tower tanks.
The tubular portion 101 and the flange portion 102 of the measurement probe 100 are made of, for example, stainless steel.

At least a part of the structural material of the measurement probe 100 may be made of, for example, a radiation-resistant resin. Even when a resin is used for at least a part of the structural material of the measurement probe 100, since the resin has radiation resistance, each optical fiber 110-140, 210, 220 can be appropriately protected, and each optical fiber can be appropriately protected. The durability of 110-140, 210, 220 can be improved.

In addition, if the liquid to be measured contains halogen-based ions such as chlorine ions and is liquid that may corrode even stainless steel, the part that comes into contact with the liquid to be measured, etc. By making at least a part of the structural material of the measuring probe 100 made of resin, the durability of the measuring probe 100 can be improved.
Further, by using a resin having radiation resistance at a portion of the measurement probe 100 where there is a risk of galvanic corrosion of dissimilar metals, contact corrosion of dissimilar metals can be suppressed and the durability of the measurement probe 100 can be improved.

For the measurement probe 100, for example, a polyimide resin, a PEEK resin, a polyamide resin, or the like may be used as the resin having radiation resistance. Since the polyimide resin, PEEK resin, and polyamide resin are excellent in radiation resistance, heat resistance, and chemical resistance, and have high strength, the durability of the measurement probe immersed in a solution containing a radioactive substance can be improved.

(Optical fiber cable 20)
In some embodiments, the analyzer body 10 and the measurement probe 100, which are installed at distant locations from each other, are connected by a plurality of optical fiber cables 20 as described above. As shown in FIG. 1, the optical fiber cable 20 may be laid through, for example, a wall portion 93 that partitions a high-dose area 91.
The measurement probe 100 of some embodiments shown in FIG. 2 and the analyzer main body 10 are an irradiation optical fiber cable 20a that guides the light from the light source 11 to the measurement probe 100, and the light from the measurement probe 100. Is connected to the detector 14 by, for example, three light receiving optical fiber cables 20b.
The measurement probe 100 of one embodiment shown in FIG. 9 and the analyzer main body 10 detect the light from one irradiation optical fiber cable 20a that guides the light from the light source 11 to the measurement probe 100 and the light from the measurement probe 100. It is connected to a light receiving optical fiber cable 20b leading to the vessel 14.

The optical fiber cable 20 is configured so that it can be connected to and disconnected from the analyzer main body 10 via a connector. The optical fiber cable 20 may be provided integrally with the measurement probe 100, or may be configured so that it can be connected to and disconnected from the measurement probe 100 via a connector.

3 to 6 are schematic cross-sectional views of the optical fiber cable 20 of some embodiments. In some embodiments, as shown in FIGS. 3 to 6, the optical fiber cable 20 is an optical fiber 22 in which a plurality of optical fiber strands 21 made of quartz are bundled, and a metal through which the optical fiber 22 is inserted. The flexible tube 23 is made of a flexible tube 23, and has a holding member 30 for holding the optical fiber 22 in the flexible tube 23. The holding member 30 is also a protective member for preventing contact between the optical fiber 22 and the inner peripheral surface of the flexible tube 23.
The flexible tube 23 is a flexible metal tubular member such as a bellows tube, and covers the optical fiber 22 over the entire length of the optical fiber cable 20.

The holding member 30 of one embodiment shown in FIG. 3 is a granular material 31. That is, in the optical fiber cable 20 of the embodiment shown in FIG. 3, the space between the flexible tube 23 and the optical fiber 22 is filled with the granular material 31.
In the optical fiber cable 20 of the embodiment shown in FIG. 3, when the optical fiber 22 is bent together with the flexible tube 23, the granular material 31 moves appropriately, so that the granular material 31 hangs on the optical fiber 22 at the time of bending. Since the force is distributed, the optical fiber 22 can be appropriately protected and the durability of the optical fiber 22 can be improved.

The holding member 30 of one embodiment shown in FIG. 4 is a plurality of plate-shaped members (disks) 32 provided with a hole 32a in which the optical fiber 22 is inserted in the center. The disk 32 holds the optical fiber 22 inserted through the hole 32a on the inner peripheral surface of the hole 32a. Further, the disk 32 is held by the flexible tube 23 when the outer peripheral end abuts on the inner peripheral surface of the flexible tube 23. A plurality of disks 32 are arranged at predetermined intervals along the extending direction of the optical fiber 22.

The holding member 30 of one embodiment shown in FIG. 5 is a plurality of rod-shaped members 33. The rod-shaped member 33 is a rod-shaped member extending in a direction orthogonal to the extending direction of the optical fiber 22, that is, in the radial direction of the flexible tube 23, and one end on the optical fiber 22 side is the optical fiber wire 21. The optical fiber 22 abuts on the inner peripheral surface of the flexible tube 23 by abutting on the outer periphery of the bundled optical fiber 22 and the other end on the flexible tube 23 side abutting on the inner peripheral surface of the flexible tube 23. I'm preventing that. As shown in FIG. 5, one end of the rod-shaped member 33 on the optical fiber 22 side may have a shape extending in the circumferential direction along the outer peripheral surface of the optical fiber 22.

One end of the rod-shaped member 33 may be fixed to the outer periphery of the optical fiber 22 by adhesion or the like. Further, the other end of the rod-shaped member 33 may be fixed to the inner peripheral surface of the flexible pipe 23 by adhesion or the like.

The rod-shaped member 33 is arranged so as to extend radially around the optical fiber 22 in at least three directions. In the example shown in FIG. 5, the rod-shaped member 33 extends in four directions around the optical fiber 22.
Further, the rod-shaped members 33 are arranged at a plurality of positions at predetermined intervals along the extending direction of the optical fiber 22.

In the holding member 30 of the embodiment shown in FIG. 4 or 5, the optical fiber 22 can be protected by the holding member 30 having a simple structure of a disk 32 or a rod-shaped member 33, so that the holding member 30 has high durability. Thereby, the optical fiber 22 can be protected for a long period of time.

The holding member 30 of one embodiment shown in FIG. 6 is a covering member 34 that covers the outer surface of the optical fiber 22. The covering member 34 is a member that covers the outer periphery of the optical fiber 22 while allowing each of the optical fiber strands 21 to move in the extending direction when the optical fiber 22 is bent, and has flexibility.
As a result, even if the optical fiber 22 is bent together with the flexible tube 23, the covering member 34 prevents the contact between the outer surface of the optical fiber 22 and the inner peripheral surface of the flexible tube 23, so that the durability of the optical fiber 22 is improved. can.

As described above, in the optical fiber cables 20 of some embodiments shown in FIGS. 3 to 6, even if the optical fiber 22 is bent together with the flexible tube 23, the holding member 30 is the optical fiber 22 and the flexible tube. Since contact with the inner peripheral surface of the 23 is prevented, the durability of the optical fiber 22 can be improved.

In some of the above-described embodiments, the optical fiber cable 20 is covered with a metal flexible tube 23 over its entire length, but at least only the portion laid in the high dose area is made of metal. It may be covered with a tube 23.
As described above, since at least the portion of the optical fiber cable 20 existing in the high-dose area is covered with the metal flexible tube 23, the relatively high-dose radiation in the high-dose area is retained in the optical fiber 22 and. The influence on the member 30 can be suppressed, and the durability of the optical fiber 22 and the holding member 30 can be improved. Further, since the flexible tube 23 has flexibility, it does not hinder the bending of the optical fiber 22.

In some of the above-described embodiments, the granular material 31, the disk 32, and the rod-shaped member 33 are members made of graphite or a resin having radiation resistance. Further, the covering member 34 of the above-described embodiment is a member made of a resin having radiation resistance. As the resin having radiation resistance, for example, a polyimide resin, a PEEK resin, a polyamide resin and the like can be mentioned as described above.
By forming the holding member 30 from a material having radiation resistance in this way, the durability of the holding member 30 is improved even in a high dose area, so that the holding member 30 is included in the optical fiber 22 and the flexible tube 23. Contact with the peripheral surface can be prevented for a long period of time, and the durability of the optical fiber cable 20 can be improved.
Further, by forming the holding member 30 with any of polyimide resin, PEEK resin, and polyamide resin, the radiation resistance, heat resistance, and strength of the holding member 30 can be ensured, so that the optical fiber 22 can be appropriately protected and the optical fiber 22 can be appropriately protected. The durability of the fiber cable 20 can be improved.

In some of the above-described embodiments, since the optical fiber cable 20 is covered with the flexible tube 23 made of metal, the influence of radiation on the inside of the flexible tube 23 is reduced by the flexible tube 23. There is. Therefore, depending on the radiation shielding effect of the flexible tube 23, the air dose rate in the high dose area, etc., a resin having a lower radiation resistance than the polyimide resin, PEEK resin, polyamide resin, etc. is used as the material of the holding member 30. May be good.

As described above, in some embodiments, since the analyzer main body 10 is installed in a low dose area where the air dose rate is lower than that in the high dose area, the influence of radiation on the detector 14 and the like which are easily affected by radiation. Is suppressed and spectroscopic analysis becomes possible.
Further, in some embodiments, since the analyzer main body 10 has the shielding plate 15, the spectroscopic analysis can be performed by further suppressing the influence of radiation on the light source 11, the spectroscope 12, the optical path length selection unit 13, and the detector 14. It will be possible.
In some embodiments, the analyzer main body 10 is installed in a low dose area where the air dose rate is lower than that in the high dose area, so that the influence of radiation on the detector 14 and the like which are easily affected by radiation can be suppressed. Therefore, the shielding plate 15 can be simplified, or when the dose in the low dose area is low, it is not necessary to provide the shielding plate 15 in particular, and the cost increase can be suppressed.

(Regarding the structure of the measurement probe 100 according to some embodiments shown in FIG. 2)
As described above, the measurement probe 100 of some embodiments shown in FIG. 2 is provided with three optical paths having different optical path lengths. Hereinafter, the structure of the measurement probe 100 of some embodiments shown in FIG. 2 will be described with reference to FIGS. 7 and 8.
7 and 8 are schematic cross-sectional views of the vicinity of the measuring section 105 of the measuring probe 100 of some embodiments shown in FIG. 7 (a) and 8 are views showing a cross section of the measurement probe 100 cut along the extending direction of the optical fiber, and FIG. 7 (b) is A in FIG. 7 (a). -A is a cross-sectional view taken along the line.

In the measurement probe 100 of some embodiments, as shown in FIGS. 7 (b) and 8 for example, the light for receiving light is around one irradiation optical fiber 110 (irradiation optical fiber wire 111). A plurality of optical fiber strands 121 of the fiber 120 are arranged. In the following description, the light receiving optical fiber 120 is also referred to as a first fiber 120. Further, the optical fiber wire 121 of the first fiber 120 is also referred to as a first fiber wire 121.
In the measurement probe 100 of some embodiments, a plurality of optical fiber strands 131 of the light receiving optical fiber 130 are arranged around the first fiber 120. In the following description, the light receiving optical fiber 130 is also referred to as a second fiber 130. Further, the optical fiber wire 131 of the second fiber 130 is also referred to as a second fiber wire 131.
In the measurement probe 100 of some embodiments, a plurality of optical fiber strands 141 of the light receiving optical fiber 140 are arranged around the second fiber 130. In the following description, the light receiving optical fiber 140 is also referred to as a third fiber 140. Further, the optical fiber wire 141 of the third fiber 140 is also referred to as a third fiber wire 141.

In the measurement probe 100 of some embodiments, a metal partition tube 151 is arranged between the first fiber 120 and the second fiber 130, and between the second fiber 130 and the third fiber 140. , A metal partition pipe 152 is arranged. At least one of the partition tubes 151 and 152 may be a tube made of a radiation-resistant resin such as a polyimide resin, a PEEK resin, or a polyamide resin.

In the measurement probe 100 of some embodiments, the fiber strands 111, 121, 131, 141 are made of quartz, respectively. In the measurement probe 100 of some embodiments, as shown in FIG. 7B, there are gaps between the fiber strands 111 and 121, gaps between the fiber strands 131, and gaps between the fiber strands 141. A resin filler 155 is filled. For the filler, for example, epoxy resin or polyimide resin is used. When a polyimide resin is used as the filler, the polyimide resin before curing is filled in the gaps between the fiber strands 111, 121, 131, 141, and then heated to cure the polyimide resin.

In the measurement probe 100 of the embodiment shown in FIG. 7, the end face 120a of the light receiving optical fiber 120, the end face 130a of the light receiving optical fiber 130, and the end face 140a of the light receiving optical fiber 140 are along the extending direction of the optical fiber. Are placed in different positions.
Specifically, the end surface 120a of the first fiber 120 is arranged at a position farthest from the reflection surface 104 of the reflector 103 along the extending direction of the optical fiber. The position of the end face 120a along the extending direction of the optical fiber is also referred to as the first position.
The end surface 130a of the second fiber 130 is arranged at a position second far from the reflecting surface 104 of the reflecting mirror 103 along the extending direction of the optical fiber. The position of the end face 130a along the extending direction of the optical fiber is also referred to as a second position.
The end surface 140a of the third fiber 140 is arranged at a position closest to the reflecting surface 104 of the reflecting mirror 103 along the extending direction of the optical fiber. The position of the end face 140a along the extending direction of the optical fiber is also referred to as a third position.
The end face 110a of the irradiation optical fiber 110 is arranged at the same position as the end face 120a of the first fiber 120 along the extending direction of the optical fiber, but may be arranged at a position different from the end face 120a. good.

In the measurement probe 100 of the embodiment shown in FIG. 7, the light emitted from the end surface 110a of the irradiation optical fiber 110 to the distribution chamber 101b is reflected by the reflection surface 104 of the reflector 103, and each light receiving optical fiber 120 , 130, 140, respectively, reach the end faces 120a, 130a, 140a, respectively.

The optical path in which the light emitted from the end face 110a of the irradiation optical fiber 110 reaches the end face 120a of the first fiber 120 is called the first optical path 171. In FIG. 7A, the first optical path 171 is represented by a solid line and a broken line arrow.
Similarly, the optical path in which the light emitted from the end surface 110a of the irradiation optical fiber 110 reaches the end surface 130a of the second fiber 130 is referred to as a second optical path 172. In FIG. 7A, the second optical path 172 is represented by a solid line and a broken line arrow.
The optical path in which the light emitted from the end face 110a of the irradiation optical fiber 110 reaches the end face 140a of the third fiber 140 is referred to as a third optical path 173. In FIG. 7A, the third optical path 173 is represented by a solid line and a broken line arrow.

In the measurement probe 100 of one embodiment shown in FIG. 7, the optical path length of the first optical path 171 is the longest, the optical path length of the second optical path 172 is the second longest, and the optical path length of the third optical path 173 is the shortest.

In the measurement probe 100 of the embodiment shown in FIG. 7, the reflector 103 is a plane mirror. However, the arrangement position of the light receiving optical fibers 120, 130, 140 in the radial direction of the tubular portion 101, the distance between the end faces 120a, 130a, 140a of the light receiving optical fibers 120, 130, 140 and the reflector 103, etc. Depending on the situation, the reflecting mirror 103 may be a convex mirror.

In the measurement probe 100 of the embodiment shown in FIG. 7, the end faces 110a, 120a, 130a, 140a of the optical fibers 110, 120, 130, 140 are exposed in the distribution chamber 101b. However, each end face 110a, 120a, 130a, 140a may be covered with a cover glass as in the measurement probe 100 of the embodiment shown in FIG. 8 described below. Specifically, the end faces 110a and 120a may be covered with a disk-shaped cover glass, and each of the end faces 130a and the end face 140a may be covered with a ring-shaped cover glass.

In the measurement probe 100 of the other embodiment shown in FIG. 8, the end faces 110a of the irradiation optical fiber 110 and the end faces 120a, 130a, 140a of the light receiving optical fibers 120, 130, 140 are extending optical fibers. They are placed in the same position along the direction. In the measurement probe 100 of the embodiment shown in FIG. 8, each end face 110a, 120a, 130a, 140a is covered with a cover glass 156. In the measurement probe 100 of the embodiment shown in FIG. 8, the cover glass 156 may not be provided as in the measurement probe 100 of the embodiment shown in FIG.

In the measuring probe 100 of the embodiment shown in FIG. 8, the reflecting mirror 103 has a plurality of reflecting surfaces having different positions in the extending direction of the optical fiber. Specifically, in the reflecting mirror 103 of one embodiment shown in FIG. 8, the first reflecting surface 104a, which is the farthest distance from each end surface 110a, 120a, 130a, 140a of each optical fiber 110, 120, 130, 140. Is formed at the center of the tubular portion 101 in the radial direction.
Further, in the reflecting mirror 103 of one embodiment shown in FIG. 8, a second reflecting surface 104b, which is the second farthest distance from each end surface 110a, 120a, 130a, 140a of each optical fiber 110, 120, 130, 140, is provided. It is formed on the radial outer side of the first reflecting surface 104a. As will be described later, the angle of the second reflecting surface 104b is set so that the light emitted from the irradiation optical fiber 110 reaches the end surface 130a of the second fiber 130.
In the reflecting mirror 103 of one embodiment shown in FIG. 8, the third reflecting surface 104c, which is the closest to the end faces 110a, 120a, 130a, 140a of each optical fiber 110, 120, 130, 140, is the second reflecting surface. It is formed on the radial outer side of 104b. As will be described later, the angle of the third reflecting surface 104c is set so that the light emitted from the irradiation optical fiber 110 reaches the end surface 140a of the third fiber 140.

In the measurement probe 100 of the embodiment shown in FIG. 8, a part of the light irradiated from the end surface 110a of the irradiation optical fiber 110 to the distribution chamber 101b is reflected by the first reflection surface 104a of the reflecting mirror 103, and the first 1 It reaches the end face 120a of the fiber 120.
Similarly, a part of the light irradiated from the end surface 110a of the irradiation optical fiber 110 to the distribution chamber 101b is reflected by the second reflecting surface 104b of the reflecting mirror 103 and reaches the end surface 130a of the second fiber 130. A part of the light emitted from the end surface 110a of the irradiation optical fiber 110 to the distribution chamber 101b is reflected by the third reflection surface 104c of the reflecting mirror 103 and reaches the end surface 140a of the third fiber 140.

In one embodiment shown in FIG. 8, the optical path in which the light emitted from the end face 110a of the irradiation optical fiber 110 reaches the end face 120a of the first fiber 120 is referred to as a first optical path 181. In FIG. 8, the first optical path 181 is represented by a solid line and a broken line arrow.
Similarly, the optical path in which the light emitted from the end surface 110a of the irradiation optical fiber 110 reaches the end surface 130a of the second fiber 130 is referred to as a second optical path 182. In FIG. 8, the second optical path 182 is represented by a solid line and a broken line arrow.
The optical path in which the light emitted from the end face 110a of the irradiation optical fiber 110 reaches the end face 140a of the third fiber 140 is referred to as a third optical path 183. In FIG. 8, the third optical path 183 is represented by a solid line and a broken line arrow.

In the measurement probe 100 of one embodiment shown in FIG. 8, the optical path length of the first optical path 181 is the longest, the optical path length of the second optical path 182 is the second longest, and the optical path length of the third optical path 183 is the shortest.

In some embodiments shown in FIGS. 7 and 8, the light passing through the first optical paths 171 and 181 is incident on the first fiber 120 as described above, and is one of the three light receiving optical fiber cables 20b. It reaches the optical path length selection unit 13 of the analyzer main body 10 via the book (first light receiving optical fiber cable).
Similarly, the light passing through the second optical paths 172 and 182 is incident on the second fiber 130 as described above, and is different from the first light receiving optical fiber cable 20b (the first light receiving optical fiber cable 20b). 2 It reaches the optical path length selection unit 13 of the analyzer main body 10 via the light receiving optical fiber cable).
The light passing through the third optical paths 173 and 183 is incident on the third fiber 140 as described above, and is different from the above-mentioned first and second light receiving optical fiber cables 20b (first light receiving optical fiber cable 20b). 3 It reaches the optical path length selection unit 13 of the analyzer main body 10 via the light receiving optical fiber cable).

As described above, the optical path length selection unit 13 of the analyzer main body 10 shown in FIG. 1 is selected by the user or automatically selected from the three light-receiving optical fiber cables 20b. The light from the optical fiber cable 20b for receiving light, that is, the light passing through any of the first optical path 171 and 181, the second optical path 172, 182, and the third optical path 173, 183 is output to the detector 14. ..

In this way, the measuring unit 105 measures by using the analyzer main body 10 according to the embodiment shown in FIG. 1 and the measuring probe 100 according to some embodiments shown in FIGS. 2, 7, and 8. The spectroscopic analysis can be performed by switching the optical path length of the optical path of the light from the light source 11 in the liquid while being immersed in the target liquid.
For example, a single light-receiving optical fiber cable 20b guides light that has passed through any of a plurality of optical paths 171, 172, 173, 181, 182, 183 to the detector 14. At that time, if the signal level of the detection signal is out of the specified range, the light from the other optical fiber cable 20b for receiving light is detected by the optical path length selection unit 13 while the measurement unit 105 is immersed in the liquid. Switch to be guided by 14. As a result, the optical path through which the light guided to the detector 14 passes is switched to another optical path, and the optical path length is switched. As a result, the signal level of the light detection signal can be kept within the specified range, and appropriate spectroscopic analysis becomes possible.

The measurement probe 100 according to some embodiments shown in FIGS. 2, 7 and 8 is configured to have three optical paths having different optical path lengths as an example, but each has an optical path length. It may be configured to have at least two different optical paths, and may be configured to have four or more optical paths having different optical path lengths. That is, in some embodiments shown in FIGS. 7 and 8, the number of light receiving optical fibers 120, 130, 140 in the measurement probe 100 was 3, but it may be at least 2 or more.
Further, the reflecting mirror 103 of one embodiment shown in FIG. 8 has three reflecting surfaces whose positions in the extending direction of the optical fiber are different from each other. However, the reflecting mirror 103 of one embodiment shown in FIG. 8 may have two or more reflecting surfaces whose positions in the extending direction of the optical fiber are different from each other.

(Regarding the structure of the measurement probe 100 of one embodiment shown in FIG. 9)
As described above, the measurement probe 100 of the embodiment shown in FIG. 9 is provided with an optical path length adjusting unit for adjusting the optical path length. Hereinafter, the structure of the measurement probe 100 of the embodiment shown in FIG. 9 will be described with reference to FIG.
FIG. 10 is a schematic cross-sectional view of the vicinity of the measuring unit 105 of the measuring probe 100 of the embodiment shown in FIG. Note that FIG. 10 (a) is a diagram showing an example of a state in which the optical path length is set to a certain length, and FIG. 10 (b) shows a shorter optical path length than the state shown in FIG. 10 (a). It is a figure which shows an example of the case.

In the measurement probe 100 of the embodiment shown in FIG. 10, a plurality of light receiving optical fiber wires 221 of the light receiving optical fiber 220 are surrounded by one irradiation optical fiber 210 (irradiation optical fiber wire 211). Is placed.

In the measurement probe 100 of the embodiment shown in FIG. 10, an inner partition tube 153 and an outer partition tube 154 are arranged between the irradiation optical fiber 210 and the light receiving optical fiber 220.
The inner partition tube 153 is a metal tube arranged radially inside the outer partition tube 154, and covers the outer periphery of the irradiation optical fiber 210. A resin filler (not shown) is filled between the inner peripheral surface of the inner partition tube 153 and the outer peripheral surface of the optical fiber 210 for irradiation, and this filler fills the inner peripheral surface of the inner partition tube 153 and irradiation. The outer peripheral surface of the optical fiber 210 is adhered to the outer peripheral surface. For the filler, for example, epoxy resin or polyimide resin is used.

The outer partition pipe 154 is a metal pipe arranged on the outer side in the radial direction of the inner partition pipe 153. A plurality of light receiving optical fiber strands 221 are arranged between the outer peripheral surface of the outer partition tube 154 and the inner peripheral surface of the tubular portion 101. The gap between the light receiving optical fiber strands 221 is filled with the above-mentioned filler. That is, the light receiving optical fiber wire 221 and the outer partition tube 154 are fixed to the tubular portion 101 by a filler.
At least one of the inner partition pipe 153 and the outer partition pipe 154 may be a pipe made of a resin having radiation resistance such as a polyimide resin, a PEEK resin, or a polyamide resin.

As shown in FIGS. 10A and 10B, for example, the inner partition tube 153 can move together with the irradiation optical fiber 210 with respect to the outer partition tube 154 (tubular portion 101) along the extending direction of the optical fiber. ..
The inner partition tube 153 and the irradiation optical fiber 210 are driven in the extending direction of the optical fiber by the irradiation optical fiber drive mechanism 201 provided on the base end side of the tubular portion 101, that is, on the left end side in FIG.

The irradiation optical fiber drive mechanism 201 includes an actuator (not shown) that serves as a drive source, and a movement mechanism (not shown) that moves the inner partition tube 153 in the extending direction of the optical fiber by the driving force of the actuator. The irradiation optical fiber drive mechanism 201 is controlled by a control device (not shown) provided in the analyzer main body 10 shown in FIG.
In the measurement probe 100 of the embodiment shown in FIGS. 9 and 10, an O-ring (not shown) provided between the inner partition pipe 153 and the outer partition pipe 154 is used to connect the measurement unit 105 side and the irradiation optical fiber drive mechanism. Airtightness with the 201 side is maintained.

In the measurement probe 100 of the embodiment shown in FIG. 10, the light emitted from the end surface 210a of the irradiation optical fiber 210 to the distribution chamber 101b is reflected by the reflection surface 104 of the reflecting mirror 103, and the light receiving optical fiber 220 It reaches the end face 220a. In FIG. 10, the optical path 191 in the distribution chamber 101b is represented by a solid line and a broken line arrow.
As described above, in the measurement probe 100 of the embodiment shown in FIG. 10, the optical path length of the optical path 191 can be adjusted by moving the inner partition tube 153 and the irradiation optical fiber 210 in the extending direction of the optical fiber.
That is, by using the analyzer main body 10 according to the embodiment shown in FIG. 1 and the measurement probe 100 according to some embodiments shown in FIGS. 9 and 10, the measuring unit 105 is immersed in the liquid to be measured. The spectroscopic analysis can be performed by switching the optical path length of the optical path 191 in the liquid of the light from the light source 11 in the same state.
For example, when the signal level of the light detection signal passing through the optical path 191 is out of the specified range, the inner partition tube 153 and the irradiation optical fiber 210 are connected to the optical fiber while the measuring unit 105 is immersed in the liquid. The optical path length of the optical path 191 can be switched by moving the optical path in the extending direction. As a result, the signal level of the light detection signal can be kept within the specified range, and appropriate spectroscopic analysis becomes possible.
In the measurement probe 100 of the embodiment shown in FIG. 10, the optical fiber for receiving light is only the optical fiber 220 for receiving light. Therefore, when the measurement probe 100 of the embodiment shown in FIG. 10 is used, the light for receiving light is received. Only one fiber cable 20b may be used. Therefore, when the measurement probe 100 of one embodiment shown in FIG. 10 is used, the analyzer main body 10 does not have to have the optical path length selection unit 13.

(About the spectroscopic analysis method using the spectroscopic analyzer 1)
The spectroscopic analysis method using the spectroscopic analyzer 1 of some of the above-described embodiments will be described. In order to perform spectroscopic analysis, as shown in FIG. 1, the measurement probe 100 must be attached to the pipe 80 or the like, and the measurement unit 105 must be immersed in the liquid to be measured.
First, the light from the light source 11 is guided to the measurement probe 100 via the irradiation optical fiber cable 20a, and the liquid in the measurement unit 105 is irradiated with the light from the irradiation optical fibers 110 and 210.
As a result, the light irradiated to the liquid enters the light receiving optical fibers 120, 130, 140, 220 via any of the optical paths 171, 172, 173, 181, 182, 183, 191.

In the embodiment shown in FIGS. 2, 7 and 8, the light incident on the light receiving optical fibers 120, 130, 140, that is, the light transmitted through the liquid in the circulation chamber 101b is the light received from the plurality of light receiving optical fiber cables 20b. The optical path length selection unit 13 of the analyzer main body 10 is reached via any of the above. Therefore, the light from any of the light receiving optical fiber cables 20b selected by the optical path length selection unit 13 is output from the optical path length selection unit 13 to the detector 14.
The detector 14 performs spectroscopic analysis based on the light from the optical path length selection unit 13.
At that time, when the signal level of the light detection signal in the detector 14 is out of the specified range, the optical path length selection unit 13 is switched so that the light from the other light receiving optical fiber cable 20b is output to the detector 14. As a result, the optical path length of the light from the light source 11 in the liquid can be switched while the measuring unit 105 is immersed in the liquid.
As a result, the signal level of the light detection signal can be kept within the specified range, and appropriate spectroscopic analysis becomes possible.

Further, in the embodiment shown in FIGS. 9 and 10, the light incident on the light receiving optical fiber 220, that is, the light transmitted through the liquid in the distribution chamber 101b is analyzed via one light receiving optical fiber cable 20b. It reaches the detector 14 of the device main body 10.
The detector 14 performs spectroscopic analysis based on the light from the light receiving optical fiber cable 20b.
At that time, when the signal level of the light detection signal in the detector 14 is out of the specified range, the measuring unit 105 is liquid by moving the inner partition tube 153 and the irradiation optical fiber 210 in the extending direction of the optical fiber. The optical path length of the light from the light source 11 in the liquid can be switched while being immersed in the light source 11.
As a result, the signal level of the light detection signal can be kept within the specified range, and appropriate spectroscopic analysis becomes possible.

As described above, in the spectroscopic analyzer 1 of some of the above-described embodiments, the optical path 171, of the light from the light source 11 in the liquid while the measuring unit 105 is immersed in the liquid to be measured. It is configured so that the optical path lengths of 172, 173, 181, 182, 183, and 191 can be switched for analysis.

Further, in the spectroscopic analysis method using the spectroscopic analyzer 1 of some of the above-described embodiments, the step of immersing the measurement unit 105 of the measurement probe 100 in the liquid to be analyzed and the optical fiber cable for irradiating the light from the light source 11 The step of guiding the light to the measuring probe 100 via 20a and irradiating the liquid in the measuring unit 105 with the light from the light source 11, and receiving the light irradiated to the liquid via the light receiving optical fibers 120, 130, 140, 220. Steps to analyze the liquid based on the light received by the light receiving optical fibers 120, 130, 140, 220, and the signal of the light detection signal of the light receiving optical fibers 120, 130, 140, 220. When the level is out of the specified range, a step of switching the optical path length of the light from the light source 11 in the liquid while the measuring unit 105 is immersed in the liquid is provided.

Therefore, even when the measurement probe 100 is inserted into the pipe 80 or the like as shown in FIG. 1, it is not necessary to remove the measurement probe 100 from the pipe 80 or the like. As a result, for example, since it is not necessary for the worker to go to the place where the measurement probe 100 is installed in the facility, the man-hours of the worker can be reduced, and the solution having a large concentration fluctuation range can be rapidly subjected to spectroscopic analysis.
In particular, as shown in FIG. 1, the measurement probe 100 is installed in an area where the measurement probe 100 cannot enter unless the worker prepares to enter the high dose area, such as when the measurement probe 100 is installed in the high dose area. If this is the case, preparations for workers to enter the high-dose area are not required, which is useful.
In addition, it is derived from distance reasons such as the installation location of the measurement probe 100 being far away, accessibility reasons such as the installation location of the measurement probe being narrow, work environment reasons such as ambient temperature, and liquid properties. This is useful when there is a reason why it is not easy to remove the measurement probe from the pipe or the like.

In one embodiment shown in FIG. 7, the light receiving optical fibers 120, 130, 140 have a first fiber 120 having an end face 120a at a first position in the extending direction of the optical fiber, and the first fiber 120a in the extending direction of the optical fiber. A second fiber 130 having an end surface 130a at a second position different from the position and a third fiber 140 having an end surface 140a at a third position different from the first position and the second position in the extending direction of the optical fiber. include.
As a result, the optical path length can be easily changed, so that the measurement range of the spectroscopic analyzer can be changed quickly, and the efficiency of the analysis work is improved. Further, by making the positions of the end faces 120a, 130a, 140a different between the first fiber 120, the second fiber 130, and the third fiber 140, a plurality of types of optical paths (first optical path 171 and second optical path 172, and first optical path 171 and second optical path 172, and the like) are different from each other. The three optical paths 173) can be easily formed.

In one embodiment shown in FIG. 8, the reflecting mirror 103 has a plurality of reflecting surfaces 104a, 104b, 104c whose positions in the extending direction of the optical fiber are different from each other.
As a result, it is possible to easily form a plurality of types of optical paths (first optical path 181, second optical path 182, and third optical path 183) that are different from each other.

In one embodiment shown in FIGS. 9 and 10, the irradiation optical fiber drive mechanism 201 moves the irradiation optical fiber 210 in the measurement probe 100 along the extending direction of the irradiation optical fiber 210, so that the optical path 191 is formed. Adjust the optical path length.
As a result, the optical path length can be easily changed, so that the measurement range of the spectroscopic analyzer can be changed quickly, and the efficiency of the analysis work is improved. Further, since it is possible to switch to a plurality of different optical path lengths without increasing the number of optical fibers, the number of optical fibers inserted into the measurement probe 100 can be suppressed, and the radial size of the measurement probe 100 can be suppressed. can.

The present invention is not limited to the above-described embodiment, and includes a modified form of the above-described embodiment and a combination of these embodiments as appropriate.
For example, in some of the embodiments described above, the spectroscopic analyzer 1 is used in a nuclear facility. However, the spectroscopic analyzer 1 according to some of the above-described embodiments may be used in facilities other than nuclear facilities, for example, general factories and research facilities.

In some of the above-described embodiments, the spectroscopic analyzer 1 is a stationary device, but it may be a portable device.
Even when the spectroscopic analyzer 1 is a portable device and the spectroscopic analysis is performed at the destination of the spectroscopic analyzer 1, the optical path length can be adjusted without the operator touching the measuring unit 105 immersed in the liquid. Can be switched. As a result, the measurement range of the spectroscopic analyzer can be easily changed regardless of the properties of the liquid, which is highly convenient.

In the optical fiber cable 20 of some of the above-described embodiments, at least a portion laid in the high dose area is covered with a metal flexible tube 23. However, for example, even in a high dose area, when the optical fiber cable 20 is laid in a duct that shields radiation, the optical fiber cable 20 is covered with a metal flexible tube 23. It does not have to be.

In the measurement probe 100 of the embodiment shown in FIGS. 9 and 10, the inner partition tube 153 and the irradiation optical fiber 210 move along the extending direction of the optical fiber with respect to the outer partition tube 154 (tubular portion 101). It is configured to be possible. However, the inner partition tube 153 and the irradiation optical fiber 210 are fixed to the tubular portion 101, and the outer partition tube 154 and the light receiving optical fiber 220 can move with respect to the tubular portion 101 along the extending direction of the optical fiber. It may be configured in.

Further, the inner partition tube 153 and the irradiation optical fiber 210, the outer partition tube 154 and the light receiving optical fiber 220 are fixed to the tubular portion 101, and the reflecting mirror 103 extends the optical fiber to the tubular portion 101. It may be configured to be movable along the direction.
FIG. 11 is a schematic cross-sectional view of the vicinity of the measuring portion 105 of the measuring probe 100 according to the modified example in which the reflecting mirror 103 is movably configured with respect to the tubular portion 101. Note that FIG. 11 (a) is a diagram showing an example of a state in which the optical path length is set to a certain length, and FIG. 11 (b) shows an optical path length longer than that in the state shown in FIG. 11 (a). It is a figure which shows an example of the case.

In the measurement probe 100 according to the modified example shown in FIG. 11, a sleeve 107 that can move in the extending direction of the optical fiber with respect to the tubular portion 101 is provided on the outer periphery of the tubular portion 101. In the measurement probe 100 according to the modified example shown in FIG. 11, the reflector 103 is attached to the inside of the sleeve 107 at the right end of the drawing. The sleeve 107 is provided with an opening 107a so that an external liquid can circulate in the distribution chamber 107b. In the measurement probe 100 according to the modified example shown in FIG. 11, the tip 101d of the tubular portion 101, that is, the right end in the drawing is open.

In the measurement probe 100 according to the modified example shown in FIG. 11, which is configured in this way, the sleeve 107 is moved with respect to the tubular portion 101 in the extending direction of the optical fiber to obtain the reflecting surface 104 of the reflecting mirror 103 and the reflecting surface 104. Since the distance between the end face 210a of the irradiation optical fiber 210 and the end face 220a of the light receiving optical fiber 220 can be changed, the optical path length of the optical path 191 can be changed.
Even the measurement probe 100 according to the modified example shown in FIG. 11 has the same effect and effect as the measurement probe 100 of the embodiment shown in FIGS. 9 and 10.

1 Spectroscopy analyzer 10 Analyzer body 11 Light source 12 Spectrometer 13 Optical path length selection unit 14 Detector 15 Shielding plate 20 Optical fiber cable 20a Irradiation optical fiber cable 20b Light receiving optical fiber cable 21 Optical fiber wire 22 Optical fiber 23 Possible Flexible tube 30 Holding member 31 Granules 32 Plate-shaped member (disk)
33 Rod-shaped member 34 Covering member 80 Piping 91 High-dose area 92 Low-dose area 100 Measuring probe 101 Tubular part 103 Reflecting mirror 104 Reflecting surface 104a First reflecting surface 104b Second reflecting surface 104c Third reflecting surface 105 Measuring part 110, 210 Irradiation Optical fiber for light reception 110a, 120a, 130a, 140a, 210a, 220a End face 120 Optical fiber for light reception (first fiber)
130 Optical fiber for light reception (second fiber)
140 Optical fiber for light reception (third fiber)
171,181 1st optical path 172,182 2nd optical path 191 Optical path 220 Optical fiber for light reception

Claims (8)

A measuring probe having a measuring part immersed in a liquid,
Light source and
With the detector
An irradiation optical fiber that irradiates the liquid with light from the light source,
A light-receiving optical fiber that receives light irradiated to the liquid via the irradiation optical fiber and guides the light to the detector.
The measuring unit includes a reflecting member that reflects the light emitted from the irradiation optical fiber.
Of a plurality of types of optical paths in which at least one of the position of the tip surface of the irradiation optical fiber, the position of the reflection surface of the reflection member, or the position of the tip surface of the light receiving optical fiber is different from each other, the light path is guided to the detector. By providing an optical path length selection unit configured to select an optical path through which the emitted light should pass, the optical path length of the light from the light source in the liquid while the measuring unit is immersed in the liquid. A spectroscopic analyzer that can be switched and analyzed. At least one of the irradiation optical fiber and the light receiving optical fiber includes a plurality of optical fibers.
The plurality of optical fibers are
A first fiber having the tip surface at the first position in the extending direction of the optical fiber,
A second fiber having the tip surface at a second position different from the first position in the extending direction of the optical fiber,
The spectroscopic analyzer according to claim 1. The spectroscopic analyzer according to claim 1, wherein the reflecting member has a plurality of reflecting surfaces whose positions in the extending direction of the irradiation optical fiber or the light receiving optical fiber are different from each other. A measuring probe having a measuring part immersed in a liquid,
Light source and
With the detector
An irradiation optical fiber that irradiates the liquid with light from the light source,
A light-receiving optical fiber that receives light irradiated to the liquid via the irradiation optical fiber and guides the light to the detector.
The measuring unit includes a reflecting member that reflects the light emitted from the irradiation optical fiber.
By changing at least one of the position of the tip surface of the irradiation optical fiber, the position of the reflection surface of the reflection member, or the position of the tip surface of the light receiving optical fiber, the liquid of light from the light source. A spectroscopic analyzer configured to be capable of analysis by switching the optical path length while the measuring unit is immersed in the liquid by including an optical path length adjusting unit for adjusting the optical path length inside. The optical path length adjusting unit moves at least one of the irradiation optical fiber or the light receiving optical fiber in the measuring probe along the extending direction of the irradiation optical fiber or the light receiving optical fiber. The spectroscopic analyzer according to claim 4, wherein the optical path length is adjusted. The optical path length adjusting unit adjusts the optical path length by moving the reflective surface of the reflecting member in the measuring probe along the extending direction of the irradiation optical fiber or the light receiving optical fiber. 4. The spectroscopic analyzer according to 4. The step of immersing the measuring part of the measuring probe in the liquid to be analyzed,
A step of guiding the light from the light source to the measurement probe via an optical fiber for irradiation and irradiating the liquid in the measurement unit with the light.
A step of receiving the light irradiated to the liquid via a light receiving optical fiber and guiding the light to the detector.
A step of analyzing the liquid based on the light received by the light receiving optical fiber, and
When the signal level of the light detection signal of the light receiving optical fiber is out of the specified range, the position of the tip surface of the irradiation optical fiber, the position of the reflecting surface of the reflecting member of the measuring unit, or the light receiving. A state in which the measuring unit is immersed in the liquid by selecting an optical path through which light guided to the detector should pass from among a plurality of types of optical paths in which at least one of the positions of the tip surfaces of the optical fiber is different from each other. With the step of switching the optical path length of the light from the light source in the liquid,
A spectroscopic analysis method comprising. The step of immersing the measuring part of the measuring probe in the liquid to be analyzed,
A step of guiding the light from the light source to the measurement probe via an optical fiber for irradiation and irradiating the liquid in the measurement unit with the light.
A step of receiving the light irradiated to the liquid via a light receiving optical fiber, and a step of receiving the light.
A step of analyzing the liquid based on the light received by the light receiving optical fiber, and
When the signal level of the light detection signal of the light receiving optical fiber is out of the specified range, the position of the tip surface of the irradiation optical fiber, the position of the reflecting surface of the reflecting member of the measuring unit, or the light receiving. By changing at least one of the positions of the tip surface of the optical fiber to adjust the optical path length of the light from the light source in the liquid, the measuring unit remains immersed in the liquid. Steps to switch the optical path length and
A spectroscopic analysis method comprising.

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