JP6361461B2 - probe - Google Patents

Description

  The present invention relates to a probe used for spectroscopic analysis or the like.

  2. Description of the Related Art There is known a measuring apparatus provided with a probe for irradiating a liquid sample with measuring light and measuring the transmittance of the measuring light with respect to the measurement object. Such a measurement apparatus generally performs measurement in a state where a probe is put in a liquid sample of a measurement object (for example, Patent Documents 1 and 2).

JP 11-31602 A JP 2000-266668 A

  However, in the above measurement apparatus, when measuring a reference material for baseline correction or the like, it is necessary to take out the probe from the liquid sample and perform the measurement. At this time, a cleaning operation is required to remove the liquid sample adhering to the measurement device probe. Moreover, even if the measurement related to the reference material is performed in advance, the probe may need to be cleaned before the measurement object is measured. As described above, in the probe in which the measurement is performed by putting it in the liquid sample, the work for measuring the reference substance may be complicated.

  The present invention has been made in view of the above, and an object thereof is to provide a probe capable of measuring a reference substance by a simpler operation.

The present invention is
(1) an input optical transmission body for transmitting input light;
A light branching element that branches the input light emitted from the input light transmitter into measurement light and reference light;
An output optical transmission body for inputting the measurement light and transmitting it as output light;
A first optical path changing unit that changes the optical path of the measurement light and outputs the measurement light toward the output optical transmission body;
A measurement unit that is provided on the optical path of the measurement light upstream of the output light transmission body and communicates with the outside;
A first reference light transmitter that receives and transmits the reference light;
A second optical path changing unit that changes the optical path of the reference light and outputs the changed light to the first reference light transmitter;
A first reference cell disposed on an optical path of the reference light between the second optical path changing unit and the first reference light transmitter, and capable of injecting a reference material therein;
One end of the input optical transmitter, the optical branching element, the first optical path changing unit, one end of the output optical transmitter, the second optical path changing unit, the first reference optical transmitter And a housing portion that houses the first reference cell and the measurement portion formed on the outside,
A probe comprising,
It is.

  According to the present invention, a probe capable of measuring a reference substance by a simpler operation is provided.

It is a figure explaining schematic structure of the measuring device concerning a 1st embodiment. It is a figure explaining the structure of the probe which concerns on 1st Embodiment. It is a figure explaining the structure of the probe which concerns on 1st Embodiment. It is a figure explaining the structure of the probe which concerns on 2nd Embodiment. It is a figure explaining the structure of the probe which concerns on 2nd Embodiment. It is a figure explaining the structure of the probe which concerns on 3rd Embodiment. It is a figure explaining the modification of the probe which concerns on 3rd Embodiment. It is a figure explaining the structure of the probe which concerns on 4th Embodiment. It is a figure explaining the structure of the probe which concerns on 4th Embodiment.

[Description of Embodiment of Present Invention]
First, embodiments of the present invention will be listed and described.

  The optical probe of the present application includes (1) an input light transmission body that transmits input light, an optical branching element that branches the input light emitted from the input light transmission body into measurement light and reference light, and the measurement light An output optical transmission body that transmits as output light, a first optical path changing section that changes the optical path of the measurement light and outputs it to the output optical transmission body, and an upstream side of the output optical transmission body Provided on the optical path of the measurement light on the side, communicated with the outside, a first reference light transmitter for inputting and transmitting the reference light, and changing the optical path of the reference light, A second optical path changing unit that outputs toward the reference light transmission body, and a reference substance can be injected inside the optical path of the reference light between the second optical path changing unit and the first reference light transmission body. First reference cell, one end of the input optical transmission body, the optical branching element, and the first optical path changer. A first end of one side of the output light transmission body, the second optical path changing section, one end of the first reference light transmission body, and the first reference cell, and And a housing part in which a measurement part is formed.

  According to the above-described optical probe, the reference substance in the first reference cell can be simultaneously measured using the reference light branched from the input light by the optical branching element. Therefore, it is possible to measure the reference material by a simple operation without requiring a new operation such as cleaning the probe for measuring the reference material. In addition, when measuring the reference substance using the probe used for measuring the measurement object in this way, compared to the case where the probe is washed and measured, or when the reference substance is measured without using the probe, The reference substance can be measured in a situation closer to the object to be measured. Therefore, when the measurement result of the measurement object is corrected using the measurement result of the reference material, the correction accuracy is improved.

  (2) In the probe according to (1), the second optical path changing unit changes the optical path of the reference light so as to go to the first reference light transmitter via the first optical path changing unit. The first optical path changing unit may be configured to output the reference light toward the first reference light transmitter.

  As described above, even when the reference light passes through the first optical path changing unit, it is possible to simultaneously measure the reference substance in the first reference cell.

  (3) Moreover, about the probe as described in (1), the one end part is accommodated in the said housing | casing part, The 2nd reference light transmission body which inputs and transmits the said reference light, and the said housing | casing part A second reference cell that is accommodated and disposed on the optical path of the reference light between the second optical path changing unit and the second reference light transmitter, and capable of injecting a reference material therein, The two-optical path changing unit passes the optical path of the reference light through the first direction toward the first reference light transmitter without passing through the first optical path changing unit, or through the first optical path changing unit. A switching mechanism that is changeable in a second direction toward the second reference light transmitter, and the first optical path changing unit outputs the reference light toward the second reference light transmitter; can do.

  In such a probe, a reference substance can be measured using two reference cells, a first reference cell and a second reference cell. Accordingly, even when the reference substance is measured under two conditions, the measurement can be performed by a simple operation.

  (4) In the probe according to (3), the switching mechanism of the second optical path changing unit has an output direction of the reference light of −45 °, 0 with respect to a plane orthogonal to the incident reference light. It can be set as the structure which can be switched to 3 steps so that it may be set to (degree) or 45 degrees.

  When the switching mechanism is configured to be switchable in three stages as described above, it is necessary to perform fine angle adjustment by arranging the first reference light transmitter and the second reference light transmitter corresponding to the output direction. Therefore, the reference light can be incident on the transmission body.

  (5) In the probe according to (3) or (4), the reference materials injected into the first reference cell and the second reference cell may be different from each other.

  By adopting a configuration in which different reference materials are injected into the first reference cell and the second reference cell, it is possible to measure two types of reference materials with one probe without performing operations such as cleaning. Become.

  (6) In addition, the probe according to any one of (1) to (5) is configured to further include a temperature monitoring element that is housed in the housing unit and measures the temperature in the first reference cell. Can do.

  When the temperature monitoring element for measuring the temperature in the first reference cell is provided, the correction according to the change in the temperature in the first reference cell can be performed, so that the correction accuracy is improved.

  (7) Moreover, about the probe in any one of (1)-(6), it can be set as the structure further equipped with the temperature monitor element accommodated in the said housing | casing part and measuring the temperature in the said probe.

  When a temperature monitoring element for measuring the temperature in the probe is provided, correction according to a change in temperature in the probe can be performed, so that the correction accuracy is improved.

  (8) Moreover, about the probe in any one of (1)-(7), it can be set as the structure by which the pure water is inject | poured into the said 1st reference | standard cell.

  Thus, pure water is suitably used as a reference substance when measuring a liquid measurement object.

  (9) Further, the probe according to (8) may be configured such that a corrosion-preventing substance is added to the first reference cell.

  By adding a corrosion-preventing substance to the first reference cell, it is possible to prevent deterioration of characteristics of the reference substance in the first reference cell.

[Details of the embodiment of the present invention]
Specific examples of the probe according to the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to the claim are included.

(First embodiment)
FIG. 1 is a diagram for explaining a schematic configuration and main usage of the measuring apparatus according to the first embodiment. As shown in FIG. 1, the measuring apparatus 1 includes a light source 10, a probe 20, and an analyzer 40. The measuring object O by the measuring device 1 is a liquid.

  The light source 10 emits light (input light) that irradiates the liquid measurement object. The input light is not particularly limited, and for example, infrared light (wavelength band: 2500 nm to 4000 nm) and visible light (wavelength band: 360 nm to 830 nm) can be used, but near infrared light is preferably used. The near-infrared light used in the measuring apparatus 1 according to the present embodiment refers to light in the wavelength band of 900 nm to 2500 nm. The light source 10 is not particularly limited as long as it can emit light having the above wavelength. For example, when near infrared light is used as input light, a halogen lamp or the like can be used. The light source 10 may be configured to emit pulsed light. Further, a supercontinuum light source may be used as the light source 10.

  The probe 20 is connected to the light source 10 and the analyzer 40 by a connector or the like, guides the input light from the light source 10 and emits it to the liquid of the measurement object. Further, the probe 20 has a function of making the transmitted light or scattered light from the measurement object irradiated with light incident and guiding it to the analyzer 40. As shown in FIG. 1, the measurement is performed by introducing the tip of the probe 20 into the measurement object O. In the probe 20, light is guided by the transmission body, and a specific configuration thereof will be described later. The light source 10 and the analyzer 40 and the probe 20 may be connected by, for example, an optical fiber.

  The analyzer 40 has a function of receiving light from the probe 20 and performing measurement. The analyzer 40 includes a light receiving unit that receives transmitted light or scattered light of the measurement object guided through the transmission body in the probe 20 and an analysis unit that analyzes light received by the light receiving unit. The

  In the analyzer 40, a MCT, InSb, InGaAs, InGaAs / GaAsSb quantum well type or the like can be used as a light receiving sensor in the light receiving unit. When a configuration including a spectroscopic unit that splits light incident on the analyzer 40 and a two-dimensionally arranged light receiving sensor is adopted as the light receiving unit, the light receiving unit is shorter than when a conventional point sensor is used. Measurement in time is possible. Further, by using an InGaAs / GaAsSb quantum well type sensor as the light receiving sensor, it is possible to realize a relatively inexpensive and highly accurate measurement performance.

  When analysis is performed in the analysis unit of the analyzer 40, the measurement result of the reference material is used for baseline correction and the like. The measurement result of the reference material is analysis of transmitted light or scattered light emitted from the reference material by emitting measurement light to a reference material (for example, air, pure water, reference solution) different from the measurement target This is the result of light received by the instrument 40. Since the probe 20 according to the present embodiment has a configuration capable of measuring the reference material simultaneously with the measurement related to the measurement object, the measurement of the reference material can be performed with a simpler procedure. This point will be described later.

  Next, the probe 20 in the measuring apparatus 1 will be described with reference to FIGS. 2 and 3. 2A is a schematic configuration diagram from the front of the probe 20, and FIG. 2B is a view taken along the line IIB-IIB in FIG. 2A. 3A is a view taken in the direction of arrows IIIA-IIIA in FIG. 2B, and FIG. 3B is a view taken in the direction of arrows IIIB-IIIB in FIG. In the following embodiments, description will be made using the XYZ axes.

  As shown in FIGS. 2 and 3, the probe 20 has an input optical transmission body 21 connected to one end 21 a of the light source 10 and an end 22 a connected to the analyzer 40. The output light transmission body 22 and the reference light transmission body 23 whose one end 23a is connected to the analyzer 40 are included. What is the end 21b of the input light transmitter 21 opposite to the light source 10 side, the end 22b of the output light transmitter 22 opposite to the analyzer 40 side, and the analyzer 40 side of the reference light transmitter 23? The opposite end 23 b is accommodated in the casing 25. The input light transmission body 21, the output light transmission body 22, and the reference light transmission body 23 extend in substantially the same direction (Y-axis direction) at the end portion on the housing portion 25 side. The housing | casing part 25 has comprised the substantially cylindrical shape extended along the optical axis direction of three transmission bodies.

  The casing 25 is preferably covered with a material that prevents light from passing through, and the inside has three transmission bodies (an input light transmission body 21, an output light transmission body 22, and a reference light transmission body). 23) It is preferable that the light emitted from 23) is constituted by a member capable of guiding light. Moreover, the inside may be a cavity. When the inside is a cavity, the optical components such as the transmission body arranged inside the casing 25 are fixed by some fixing tool such as an adhesive.

  The three transmission bodies (input light transmission body 21, output light transmission body 22, and reference light transmission body 23) are each realized by an optical fiber, a glass rod, or the like. Moreover, it can also be set as the structure which combined the optical fiber and the glass rod. When an optical fiber is used as the transmission body, it is desirable to use a quartz glass fiber. The quartz glass fiber can be used particularly preferably in the measurement using near infrared light because it can transmit up to 2.5 μm, which is the long wavelength side of the near infrared, with low loss. In measurement using near infrared light, it is desirable to use an OH-free fiber or a low OH fiber as the optical fiber. This is because when OH-free fiber or low OH fiber is used, absorption in the near-infrared wavelength band can be widely and effectively avoided because it is possible to avoid absorption at wavelengths around 1.4 μm and 1.9 μm. This is because it can be used for analysis.

  As shown in FIGS. 2 and 3, the input light transmission body 21 and the output light transmission body 22 are arranged in parallel along the XY plane. The input light transmitter 21 and the reference light transmitter 23 are arranged in parallel along the YZ plane.

  The end portion 21 b of the input optical transmission body 21 and the end portion 22 b of the output optical transmission body 22 are opposed to the measurement unit 27 provided at the distal end of the housing unit 25.

  As shown in FIG. 2A, FIG. 3A, etc., the measurement unit 27 extends along the X-axis direction formed by cutting out a part of the side surface of the cylindrical housing unit 25. It is an opening. Since the measurement unit 27 is an opening, the measurement object O is introduced into the measurement unit 27 when the probe 20 is inserted into the measurement object O. A cover glass 28 that allows light to enter and exit from the inside of the housing unit 25 is provided on a wall surface of the measurement unit 27 that extends along the XZ plane and is opposed thereto.

  A reflection mirror 30 (first optical path changing unit) is disposed on the side opposite to the side where the input light transmission body 21 and the output light transmission body 22 are disposed with the measurement unit 27 interposed therebetween. The reflection mirror 30 is arranged so that light emitted from the end portion 21 b of the input light transmission body 21 and passed through the measurement unit 27 enters the output light transmission body 22 from the end portion 22 b of the output light transmission body 22. . Specifically, the reflecting mirror 30 is disposed such that the two reflecting surfaces 30a and 30b form an angle of 45 ° with respect to the X axis and extend along the Z axis (see FIG. 3A). ). As a result, as shown in FIG. 3A, the light emitted from the end portion 21b of the input light transmission body 21 and passing through the measurement unit 27 is reflected by the reflecting surfaces 30a and 30b and then in the −Y direction. Then, after passing through the measurement unit 27 again, the light enters the output light transmission body 22 from the end 22 b of the output light transmission body 22 through the condenser lens 29. As a result, the light that has passed through the measurement unit 27 enters the output light transmitter 22 as output light and is transmitted to the analyzer 40.

  Between the end 21 b of the input light transmission body 21 and the measurement unit 27, along the optical axis direction (Y-axis direction) of the light emitted from the input light transmission body 21, and the light splitting lens 31. The elements 32 are provided in this order.

  The condenser lens 31 collimates and emits the input light guided through the input light transmission body 21. Further, the light branching element 32 divides and emits the input light emitted from the condensing lens 31 and the measurement light traveling in the optical axis direction (+ Y direction) and the reference light traveling downward (−Z direction). It has a function.

  The reference beam branched downward is changed in the path in the optical axis direction (−Y direction) by the reference light mirror 33 (second optical path changing unit), and the reference cell 34 (corresponding to the first reference cell) is collected. It is configured to be able to enter the reference light transmission body 23 from the end 23 b of the reference light transmission body 23 via the optical lens 35.

  Here, the reference cell 34 is a cell into which a reference material for correcting the measurement result of the measurement object analyzed by the analyzer 40 is introduced. The reference cell 34 can introduce, for example, air, water (pure water), a reference liquid (a liquid that becomes a blank with respect to the measurement object O), or the like, from an inlet (not shown). The reference substance introduced into the inside is appropriately selected according to the measurement object O by the probe 20. When water or a reference liquid is introduced into the reference cell 34, a substance for preventing corrosion, such as a corrosive agent or a sterilizing agent, may be introduced at the same time to prevent deterioration of liquid characteristics in the reference cell 34. Thereby, even when impurities, algae, fungi, or the like are mixed in the reference cell 34, propagation can be prevented.

  It is preferable that the reference cell 34 is sealed with respect to the outside during measurement by the probe 20 and does not come into contact with the measurement object O.

  In the probe 20 as described above, the input light emitted from the light source 10 is emitted from the end 21 b into the housing 25 via the input light transmission body 21. A part of the light emitted from the end 21 b is branched downward as a reference light by the light branching element 32, while the measurement light traveling straight through the light branching element 32 passes through the measuring unit 27 to be measured. The object O is irradiated. Of the measurement light irradiated to the measurement object O, the transmitted light that has passed through the measurement object O is reflected by the reflection mirror 30, and then passes through the measurement unit 27 and from the end 22 b of the output light transmission body 22. The light enters the output light transmitter 22. The light that has propagated through the output optical transmitter 22 is analyzed by the analyzer 40.

  On the other hand, the reference light branched downward in the optical branching element 32 is changed in optical path by the reference light mirror 33, passes through the reference cell 34, and passes from the end 23 b of the reference light transmission body 23 to the reference light transmission body. 23 is incident. Thereafter, the light transmitted by the reference light transmitter 23 is used in the analyzer 40 as light for correction when analyzing the light propagated through the output light transmitter 22. The analyzer 40 may be configured to perform analysis after receiving light transmitted by the reference light transmitter 23 by a light receiving sensor or the like different from the light transmitted by the output light transmitter 22. The configuration of the analyzer 40 can be changed as appropriate.

  As described above, in the probe 20 according to the present embodiment, the reference substance can be simultaneously measured using the reference light branched from the input light by the light branching element 32. Therefore, a new operation such as cleaning the probe 20 for measuring the reference material is not required, and the reference material can be measured by a simple operation. In addition, when the reference material is measured using the probe 20 used for measuring the measurement object O as described above, the probe 20 is washed and measured, or the reference material is measured without using the probe 20. In comparison, the reference material can be measured in a situation where the environmental conditions (temperature, etc.) are closer to the measurement object O. Therefore, when the measurement result of the measurement object O is corrected using the measurement result of the reference material, the correction accuracy is improved.

(Second Embodiment)
A probe according to a second embodiment will be described with reference to FIGS. 4 and 5. 4A is a schematic configuration diagram from the front of the probe 20A, and FIG. 4B is a view taken along the arrow IVB-IVB in FIG. 4A. 5A is a view taken along the arrow VA-VA in FIG. 4B, and FIG. 5B is a view taken along the arrow VB-VB in FIG. 4B.

  The probe 20A according to the second embodiment differs from the probe 20 according to the first embodiment in that the arrangement of the reference light transmitter 23 is changed. Further, with the change in the arrangement of the reference light transmission body 23, the arrangement of mirrors and the like provided in the previous stage of the reference light transmission body 23 is changed.

  Specifically, in the probe 20A, the reference light transmitter 23 is arranged in parallel with the output light transmitter 22 in one YZ plane. For this reason, in order to make the light incident on the reference light transmission body 23 extending along the Y-axis direction, the light path branched downward by the light branching element 32 is changed to the reflection mirror 30 side by the reference light mirror 33. . The reflection mirror 30 extends along the Z axis. Therefore, the light emitted to the reflection mirror 30 side by the reference light mirror 33 is configured to enter the reference light transmission body 23 via the reflection surfaces 30a and 30b. When viewed from above, the optical path of the light emitted from the reference light mirror 33 to the reference light transmission body 23 is substantially the same as the optical path to the output light transmission body 22 of the light traveling straight through the optical branching element 32.

  Further, in the probe 20 </ b> A according to the second embodiment, the arrangement of the reference cells 34 is changed, and the reference cells 34 are provided on the lower side (−Z direction side) of the measurement unit 27.

  In the probe 20A according to the second embodiment, the light branched downward in the optical branching element 32 is reflected by the reflection mirror 30 side after passing through the reference cell 34 after the optical path is changed by the reference light mirror 33. After passing through the reference cell 34 again, the light enters the reference light transmission body 23 from the end 23 b of the reference light transmission body 23. Thereafter, the light propagated through the reference light transmission body 23 is used as light for correction in the analyzer 40 when analyzing the light propagated through the output light transmission body 22.

  As described above, also in the probe 20A according to the second embodiment, the reference material can be measured simultaneously using the reference light branched by the light branching element 32. Therefore, a new operation such as cleaning the probe 20A for measuring the reference material is not required, and the reference material can be measured by a simple operation. In the probe 20A, the branched light enters the reference light transmitter 23 after passing through the reference cell 34 twice. This is the same configuration as the configuration in which the light incident on the output light transmitter 22 passes through the measurement unit 27 twice. Therefore, the reference material can be measured under the same conditions as the measurement object O, and correction with higher accuracy is possible.

  Note that the position and shape of the reference cell 34 are not particularly limited as long as the reference cell 34 is disposed on the optical path until the light branched by the light branching element 32 enters the reference light transmission body 23.

(Third embodiment)
A probe according to a third embodiment will be described with reference to FIG. FIG. 6 is a schematic configuration diagram from the front of the probe 20B.

  A probe 20B according to the third embodiment is obtained by arranging a temperature monitoring element 36A (temperature measurement unit) with respect to the probe 20 according to the first embodiment. As shown in FIG. 6, in the probe 20B, the temperature of the reference material in the reference cell 34 is measured by the temperature monitoring element 36A. As the temperature monitoring element 36A, for example, a thermocouple, thermistor, platinum or the like can be used. The temperature monitoring element 36 </ b> A is connected to the analyzer 40 via a conducting wire 36 </ b> B, and the temperature information is acquired in the analyzer 40. The temperature information acquired by the analyzer 40 is used for correcting the measurement result of the measurement object O.

  As in the probe 20B according to the third embodiment, the temperature monitor element 36A is configured to measure the temperature of the surrounding environment of the reference material, whereby correction according to the temperature change of the reference material can be performed. Further, in the case where a configuration for measuring the temperature of the measurement object O in the measurement unit 27 is provided, the temperature correction can also be performed for the measurement result of the measurement object O, so that the correction can be performed with high accuracy. it can.

  In addition, although the probe 20B has shown the structure which measures the temperature of the reference material in the reference cell 34, it is good also as a structure which measures the temperature in a probe. FIG. 7 shows a probe having a configuration for directly measuring the temperature in the probe.

  The probe 20C shown in FIG. 7 includes a temperature monitoring element 37A that measures the temperature inside the probe 20C in addition to the temperature monitoring element 36A that measures the temperature of the reference substance in the reference cell 34. The temperature monitoring element 37A is connected to the analyzer 40 via a conducting wire 37B. In the probe 20C having such a configuration, the temperature in the probe 20C can be measured using the temperature monitoring element 37A, and therefore, correction according to the temperature change can be performed using this measurement result.

(Fourth embodiment)
A probe according to a fourth embodiment will be described with reference to FIGS. FIG. 8A is a schematic configuration diagram from the front of the probe 20D, and FIG. 8B is a view taken along arrow VIIIB-VIIIB in FIG. 8A. 9A is a view taken in the direction of arrows IXA-IXA in FIG. 8B, and FIG. 9B is a view taken in the direction of arrows IXB-IXB in FIG. 8B.

  The probe 20D according to the fourth embodiment is different from the probe 20 according to the first embodiment in that two reference light transmission bodies are provided. Further, since two reference light transmitters are provided, the reference light mirror is changed to a variable angle mirror.

  Specifically, in the probe 20D, the first reference light transmitter 231 disposed in parallel with the input light transmitter 21 in one YZ plane and the output light transmitter 22 in another YZ plane. And a second reference light transmission body 232 disposed in the. The reference light mirror 33A disposed below the light branching element 32 is variable in angle and functions as a switching mechanism that can change the optical path of the reference light. The angle of the reference light mirror 33A is changed by voltage control or the like via a conducting wire 33B connected to an external control device (not shown). The reference light mirror 33A may have a configuration in which the angle can be freely changed, but at least when light is emitted toward the first reference light transmitter 231 (first direction: from the light branching element 32). When the light is emitted toward the second reference light transmitter 232 (second direction: a surface orthogonal to the reference light from the light branching element 32). From + 45 °) and when the measurement with the reference light transmitter is not performed (0 ° from the plane orthogonal to the reference light from the optical branching element 32), the angle can be changed in three steps. There is no particular limitation.

  A first reference cell 341 is provided between the first reference light transmitter 231 and the reference light mirror 33A. A second reference cell 342 is provided between the reference light mirror 33 </ b> A and the reflection mirror 30 and below the measurement unit 27. The first reference cell 341 is arranged in the same manner as the reference cell 34 in the probe 20 of the first embodiment. The second reference cell 342 is arranged in the same manner as the reference cell 34 in the probe 20A of the second embodiment. Since the first reference cell 341 and the second reference cell 342 are independent, different reference materials can be introduced.

  In such a probe 20D, when the reference light branched by the light branching element 32 by the reference light mirror 33A is emitted to the first reference light transmitter 231 side, the light that has passed through the first reference cell 341 The light enters the first reference light transmitter 231. Therefore, the reference substance in the first reference cell 341 can be measured. On the other hand, when the reference light branched by the light branching element 32 by the reference light mirror 33A is emitted to the reflection mirror 30 side, the light that passes through the second reference cell 342 and is reflected by the reflection mirror 30 is The light passes through the second reference cell 342 again and enters the second reference light transmitter 232. Therefore, the reference substance in the second reference cell 342 can be measured.

  As described above, in the probe 20D according to the fourth embodiment, the two reference cells 341 and 342 can hold two different reference materials, and by changing the angle of the reference light mirror 33A, Measurement can be performed by selecting a reference substance to be used for measurement according to the measurement object O. Therefore, it is possible to reduce work such as replacing the reference material according to the measurement object O, and it is possible to measure the reference material according to the measurement object by a simpler operation.

  The probe according to the embodiment of the present invention has been described above, but the probe according to the present invention is not limited to the above embodiment, and various modifications can be made.

  For example, the measurement unit in the probe according to the present invention may be arranged on the optical path of the measurement light, and the shape thereof can be changed as appropriate. Further, the reference cell may be arranged on the optical path of the reference light, and the shape thereof can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Measuring apparatus, 10 ... Light source, 20, 20A-20D ... Probe, 21 ... Input light transmission body, 22 ... Output light transmission body, 23, 231, 232 ... Reference light transmission body, 30 ... Reflection mirror, 32 ... Light Branch element 33 ... Mirror for reference light, 34, 341, 342 ... Standard cell, 40 ... Analyzer.

Claims (9)

An input optical transmission body for transmitting input light; and
A light branching element that branches the input light emitted from the input light transmitter into measurement light and reference light;
An output optical transmission body for inputting the measurement light and transmitting it as output light;
A first optical path changing unit that changes the optical path of the measurement light and outputs the measurement light toward the output optical transmission body;
A measurement unit that is provided on the optical path of the measurement light upstream of the output light transmission body and communicates with the outside;
A first reference light transmitter that receives and transmits the reference light;
A second optical path changing unit that changes the optical path of the reference light and outputs the changed light to the first reference light transmitter;
A first reference cell disposed on an optical path of the reference light between the second optical path changing unit and the first reference light transmitter, and capable of injecting a reference material therein;
One end of the input optical transmitter, the optical branching element, the first optical path changing unit, one end of the output optical transmitter, the second optical path changing unit, the first reference optical transmitter And a housing portion that houses the first reference cell and the measurement portion formed on the outside,
Probe with. The second optical path changing unit changes the optical path of the reference light so as to go to the first reference light transmitter via the first optical path changing unit,
The probe according to claim 1, wherein the first optical path changing unit outputs the reference light toward the first reference light transmitter. A second reference light transmission body that receives one end of the reference light and transmits the reference light;
A second reference cell that is housed in the housing part and disposed on the optical path of the reference light between the second optical path changing unit and the second reference light transmitter, and capable of injecting a reference substance therein;
Further comprising
The second optical path changing unit passes the optical path of the reference light in a first direction toward the first reference light transmitter without passing through the first optical path changing unit, or through the first optical path changing unit. A switching mechanism that can be changed to a second direction toward the second reference light transmitter,
The probe according to claim 1, wherein the first optical path changing unit outputs the reference light toward the second reference light transmitter.   The switching mechanism of the second optical path changing unit can be switched in three stages so that the output direction of the reference light is −45 °, 0 ° or 45 ° with respect to the plane orthogonal to the incident reference light. The probe according to claim 3.   The probe according to claim 3 or 4, wherein the reference materials injected into the first reference cell and the second reference cell are different from each other.   The probe as described in any one of Claims 1-5 further equipped with the temperature monitor element accommodated in the said housing | casing part and measuring the temperature in a said 1st reference | standard cell.   The probe as described in any one of Claims 1-6 further equipped with the temperature monitor element accommodated in the said housing | casing part and measuring the temperature in the said probe.   The probe according to claim 1, wherein pure water is injected into the first reference cell. The probe according to claim 8, wherein a substance for preventing corrosion is added to the first reference cell.

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